Jobs at Djinni

Job Title:

Block-Builder Engineer

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

An advanced block construction platform operating on the Ethereum mainnet that processes order flow, transaction bundles, and submits finalized blocks through relay networks in real time. It addresses neutral and efficient block building to unlock new decentralized finance capabilities, including intrablock lending and execution extensions. The system handles high-throughput data pipelines and strict latency requirements, backed by comprehensive observability and analytics to drive iterative improvements based on live production metrics. Strong engineers are essential to maintain system health under real-time load, verify data-driven hypotheses, and innovate on core protocol logic.

About the Role:

The Block-Builder Engineer will join an experienced team in Kraków or Warsaw to develop and maintain a next-generation Ethereum block construction system. You will own pipeline components that ingest order flow and transaction bundles, manage relay submission paths, and ensure stable performance under real-time load. Your work will include building and refining observability platforms, conducting controlled A/B experiments, and driving reliability improvements such as panic mitigation and latency regression detection. As you ramp, you will contribute to optimization-driven block building logic, on-chain intrablock lending protocols, and an execution extension, gaining autonomy and deep technical ownership across the core stack.

Key Responsibilities:

- Integrate and process order-flow ingestion, bundle and transaction handling, back-pressure management, and reintegration of data for block inputs.

- Develop and maintain relay submission paths to ensure end-to-end block delivery under production load.

- Build and enhance telemetry and dashboards using Grafana, Prometheus, Loki and SQL to provide trusted observability.

- Diagnose and correct measurement issues—broken counters, misleading dashboards, and erroneous denominators—to maintain metric accuracy.

- Design, execute and analyze controlled A/B experiments in production, reporting findings objectively, including inconclusive results.

- Identify and resolve system panics, dropped messages, and latency regressions, with automated tests to prevent recurrence.

- Optimize data pipelines and processing systems for high-throughput, low-latency performance.

- Contribute to the development of intrablock lending protocols and associated trusted-execution components.

- Collaborate on an execution extension (BEX) and future protocol and exchange-layer enhancements.

Required Competence and Skills:

- 2–4 years of professional software engineering experience shipping and operating production systems.

- Minimum 2 years working on Ethereum or other EVM-compatible blockchains.

- Proficiency in Rust or strong systems experience in Go, C++ or Java with eagerness to adopt Rust.

- Solid understanding of concurrent and real-time code within large, existing codebases.

- Strong SQL skills and practical experience with Python for data analysis and tooling.

- Familiarity with monitoring and analytics tooling and a drive to ensure metric correctness.

- Rigorous engineering habits, including comprehensive testing and clear distinction between verified and assumed behavior.

- Data-driven mindset with a habit of querying logs and databases to validate change impact.

Nice to Have:

- Exposure to Ethereum block-building protocols (PBS/MEV), smart contract interactions, or trading systems.

- Experience with high-throughput data pipelines, time-series databases, or large-scale analytics.

- Familiarity with Ethereum client internals (reth, geth, revm) or deploying services on Kubernetes and Docker.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

About the Product & Team

Our client is an innovative, fast-growing tech startup developing a next-generation AI agent for autonomous browser and web workflow automation. The platform leverages modern LLMs to dynamically inspect web interfaces, generate resilient Playwright automation scripts, and execute complex, repetitive browser tasks for businesses across the US.

• This is a new area within the scope of software engineering, but we believe the current positions will be suitable for Automation QA professionals. 

You will be joining a lean, engineering-driven team where your work directly shapes the core AI product, solves real-world customer automation challenges, and drives the adoption of agentic AI systems.

Role Overview

We are seeking a proactive Forward Deployed Engineer to help international clients integrate, optimize, and scale this AI-driven browser automation agent. In this role, you will sit at the intersection of customer-facing technical integrations, prompt engineering, and script troubleshooting.

You will collaborate closely with the CTO to onboard new users, monitor agent execution, refine daily system prompts, and fine-tune generated automation scripts to ensure maximum reliability for end-user workflows.

Key Responsibilities

• Client Onboarding & Integrations: Guide clients through workflow setups, analyze their business processes, and troubleshoot integration bottlenecks (transitioning from async ticket analysis to leading live customer calls).
• AI Agent Optimization & Prompting: Daily monitoring of agent performance, identifying edge cases, and engineering/adjusting prompts to improve output accuracy.
• Script & Locator Troubleshooting: Review, debug, and manually adjust agent-generated Playwright automation scripts when complex dynamic web elements or DOM changes occur.
• Codebase Maintenance: Contribute to maintaining JavaScript-based core modules and supporting integration tools (~20–30% of total workload).
• Feedback Loop: Act as the technical bridge between customer workflows and product development to drive platform improvements.

Requirements

• Communication: C1 / Fluent English with confident verbal presentation skills and comfort leading live video calls with US/EU clients.
• AI & LLM Proficiency: Strong hands-on experience with LLMs, practical prompt engineering, and AI tools for debugging and automating workflows.
• Web Fundamentals: Solid understanding of the DOM tree, dynamic web elements, XPath, and CSS selectors.
• Technical Skills: Practical ability to read, understand, and debug JavaScript / TypeScript code.
• Time Flexibility: Ability to comfortably handle team and client calls during late afternoon/evening hours (up to 20:00–21:00 Kyiv time).

Nice to Have

• Hands-on experience with browser automation frameworks (Playwright).
• Background in QA Automation, Solutions Engineering, Technical Support (Tier 3), or Technical Customer Success.
• Familiarity with LLM function calling, structured outputs, or agentic workflows.

We OFFER:

• ​A fast-paced, highly professional, international team environment with a flat structure and rapid decision-making.
• ​Competitive compensation packages commensurate with your background and product portfolio.
• ​Flexible, remote-first workflow optimized for seamless global alignment.
• Medical Insurance in Ukraine and a Multisport program in Poland.
• Offices in Ukraine (Kyiv, Kharkiv) and Poland (Wroclaw) or Remote.
• Paid vacation, sick leave, and official holidays.
• Legal & Accounting services.
• The company provides all necessary equipment.
• English classes and Education reimbursement.

🚀 Join Our Team as a Manual QA Engineer!
We are looking for a proactive and detail-oriented Manual QA Engineer to join our team and help ensure the quality of our web and mobile products. This role requires a high level of ownership, independence, and strong communication skills, as you will be the primary QA specialist on the project, working closely with developers and the Product Owner.

REQUIREMENTS:

• 1+ year of commercial experience in manual software testing.
• Upper-Intermediate English with the ability to communicate confidently and understand native speakers – MUST.
• Strong STLC knowledge, test design techniques, and experience with various testing types (functional, regression, exploratory, integration)
• Experience testing web and iOS applications.
• Experience with cross-browser and cross-platform testing.
• Understanding of release and upgrade testing processes.
• Strong knowledge of Chrome DevTools (Console, Network, Storage, Service Workers).
• Experience with TestFlight and basic familiarity with Xcode.
• Experience testing browser extensions - nice to have.
• Basic knowledge of MySQL.
• Ability to create clear test documentation (test cases, checklists, bug reports).
• Experience with Jira, Qase, or similar QA tools.
• Strong analytical, problem-solving, and communication skills.
• Ability to work independently, clarify requirements, and identify risks proactively.

RESPONSIBILITIES:
 

• Own the QA process for the project and act as the primary quality advocate within the team.
• Analyze requirements and proactively identify ambiguities, risks, and edge cases.
• Collaborate closely with developers and the Product Owner, participate actively in team meetings, planning session to ensure high product quality.
• Create, maintain, and execute test cases, checklists, and test plans.
• Perform functional, regression, exploratory, and integration testing.
• Test web applications, browser extensions, and iOS mobile applications.
• Validate new features, release candidates, and upgrade flows.
• Investigate issues using Chrome DevTools, Service Worker tools, Xcode, and other debugging utilities.
• Continuously improve QA processes and contribute to product quality initiatives.
   

WHAT WE OFFER:

• Full-time remote position with stability and career growth opportunities.
• Ukrainian holidays off, plus paid vacation and sick leave.
• Compensation for English courses and sports activities.
• Access to an in-house English-speaking club.
• Accounting support and a proactive work environment.
• Engaging corporate events and team-building activities.
   

How to Apply:
If you enjoy taking ownership, working closely with product and engineering teams, and making independent decisions that directly impact product quality, we'd love to hear from you. Please submit your resume and tell us why you'd be a great fit for this role.



 

We're looking for an experienced Chief Billing Officer to lead our PSP strategy.

Responsibilities

- Lead and develop the Billing/Payments function across the business group.

- Define and execute the PSP strategy across multiple markets, including provider selection, onboarding, payment method development, and integration roadmap execution.

- Build KPI, reporting, and monitoring frameworks covering PSP performance, payment conversion, availability, liquidity, and operational efficiency.

- Optimize payment flows by improving conversion, UX, payment stability, and reducing user-facing issues.

- Partner with engineering teams to define business requirements, prioritize initiatives, and ensure high-quality delivery.

- Manage relationships with PSPs and oversee payment operations, risk management, and service performance.

- Lead the Billing department (PSP, Monitoring, Business Analysis, Liquidity, Key Account), driving team performance, process improvements, and automation.

- Audit existing payment processes, identify bottlenecks, and implement scalable operational improvements.

Requirements

- Proven experience in Billing, Payments, or PSP within the iGaming industry.

- Strong understanding of payment infrastructure, including PSPs, payment methods, integrations, conversion optimization, monitoring, payment errors, balances, liquidity management, and payment method stability.

- Experience working with complex markets, preferably CIS and/or emerging markets, where rapid adaptation and continuous payment solution development are required.

- Experience leading teams and building operational processes, including KPIs, reporting, SLAs, prioritization, and performance management.

- Ability to work effectively with engineering teams by defining business requirements, managing backlogs, and overseeing implementation quality and timelines.

- Strong analytical skills with a data-driven approach to decision-making.

- Highly organized and structured, with the ability to deliver quality results in a fast-paced environment while maintaining a high level of ownership and professionalism.

- English proficiency at B2 level or higher.

 Our benefits to you:

🔸An exciting and challenging job in a fast-growing holding, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and more
🔸Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed
🔸Modern corporate equipment based on macOS or Windows and additional equipment are provided
🔸Paid vacations, sick leave, personal events days, days off
🔸Referral program — enjoy cooperation with your colleagues and get the bonus
🔸Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences
Rewards program for mentoring and coaching colleagues
🔸Free internal English courses
🔸In-house Travel Service
🔸Multiple internal activities: online platform for employees with quests, gamification, presents and news, PIN-UP clubs for movie / book / pets lovers and more
🔸Other benefits could be added based on your location

About:
This role sits at the intersection of advanced AI development and rigorous quality assurance
within a leading technology organization focused on delivering secure, reliable solutions for
mission-critical sectors. The Senior QA Automation Engineer will play a key part in ensuring that
innovative AI and supply chain systems meet the highest standards of reliability and
compliance, supporting the organization’s commitment to operational excellence and
technological advancement.
 

Responsibilities:
- Lead the design and implementation of automated testing frameworks for AI and LLM-based
systems
- Develop and maintain automated test suites to validate AI outputs for accuracy, consistency,
and alignment with ground truth datasets
- Build and execute integration tests to ensure seamless data flow between AI agents and
enterprise systems such as ERP platforms
- Create and run performance tests to benchmark AI model latency, throughput, and reliability in
real-time environments
- Automate API testing to verify secure data exchange, RBAC enforcement, and PII redaction
before data reaches AI models
- Map automated test cases to system requirements and user needs to support formal
verification and validation processes

- Prepare and deliver test readiness documentation and evidence for stage gate and production
release reviews
- Manage defect identification, tracking, and resolution, ensuring traceability to specific model
versions or datasets
- Collaborate with cross-functional teams, including data scientists and systems engineers, to
align testing with acceptance criteria
 

Skills:
- Expert proficiency in Python for test automation
- Strong experience with Pytest, Selenium, and Playwright
- Advanced skills in performance testing tools (Locust, JMeter, K6)
- Hands-on experience evaluating LLMs and AI models (DeepEval, TruLens, custom evaluators)
- Proficiency in SQL and data validation tools (Great Expectations)
- Experience integrating automated tests into CI/CD pipelines (GitLab)
- Familiarity with requirements management and traceability tools (Jira, Jama, Polarion)
- Strong knowledge of test management and reporting tools (TestRail, Allure)
- Solid understanding of version control systems (Git, GitLab)
- Deep knowledge of modern quality engineering practices (Shift Left, Test Pyramid, mono-repo
architecture)

This role sits within a fast-growing technology company developing advanced AI agents for the
construction industry, focused on automating the analysis of building models, drawings, and
regulatory documents to enhance compliance, planning, and design validation. As part of a
senior engineering team, this position plays a critical role in ensuring the reliability and
trustworthiness of complex, non-deterministic AI systems that support key decision-making
processes in construction projects.
 

Responsibilities:
• Design and execute comprehensive tests for agentic AI systems, focusing on tool selection,
multi-step reasoning, and recovery from failures
• Evaluate agent outputs for grounding, citation accuracy, and evidence-backed claims
• Develop and maintain automated frameworks to assess generative AI outputs for hallucination,
consistency, and factual accuracy
• Build and run guardrail and adversarial tests to identify vulnerabilities such as prompt injection
and instruction manipulation
• Validate multi-turn conversations and ensure correct handling of conversational state across
sessions
• Implement and monitor continuous evaluation of agent performance in production
environments
• Investigate and triage quality incidents, tracing failures to specific models or datasets and
collaborating on fixes

• Create and maintain robust integration and API tests to ensure seamless backend and
user-facing workflows
• Enforce quality gates and produce verification evidence to support confident releases
• Map test cases to system requirements, ensuring traceability and comprehensive coverage
 

Skills:
- Expert Python programming for test automation and custom evaluation tooling
- Hands-on experience with LLM/agent evaluation frameworks (e.g., DeepEval, TruLens,
RAGAS, or custom evaluators)
- Proficiency in designing and implementing non-deterministic and generative AI test strategies
- Strong knowledge of integration, API, and UI automation tools (e.g., Selenium, Playwright,
Requests)
- Experience with performance and load testing tools (e.g., Locust, JMeter, k6)
- Proficiency with SQL and data validation tools (e.g., Great Expectations)
- Familiarity with vector databases and retrieval corpora
- Experience integrating automated tests into CI/CD pipelines (e.g., GitLab)
- Ability to define and communicate pass/fail criteria for probabilistic systems
- Strong collaboration and communication skills with engineering and product teams

NuxGame is a B2B iGaming technology provider. We deliver turnkey casino and sportsbook platforms, game aggregation, and sweepstakes products to operators worldwide, across four product lines: Turnkey Traditional, Sweepstakes Turnkey, Game Aggregation, and Sweepstakes Game Aggregation. Our customers are operators. Their back office teams work in our platform every day, and their players use it every time they deposit, verify their identity, or withdraw.
We are looking for a Product Manager to join our team.

What we expect from the candidate:

• You own the roadmap for your domains and you defend it. Prioritisation is your call to make and to explain, not something you escalate by default.
• You write specifications that an engineer can build from without a business analyst in between: scope and non scope, flows, edge cases, dependencies, acceptance criteria.
• You work with data yourself. You define the metric, pull the number, and check it before you act on it.
• You go deep on the technical side. You read API documentation, review integration contracts, and hold your own in a discussion with engineers.
• You design for many operators at once. Every decision is a decision about configuration, defaults, and backward compatibility, not about a single customer.
• You close the loop after release. A feature that shipped and moved nothing is not a delivered feature.

Requirements

Must have

• 5+ years in product management, with at least 3 years owning payments, fraud and risk, or financial products in iGaming, fintech, or payments.
• Hands on experience with PSP and payment aggregator integrations: REST APIs, request and response construction, webhooks and callbacks, idempotency, status and error mapping, reconciliation.
• Practical understanding of the trade offs between hosted payment pages, iframe, and fully platform hosted cashier flows, including where PCI scope, conversion, and support load land in each.
• Experience with several payment method families: cards, e-wallets, bank transfer and local rails, vouchers, and crypto (networks, confirmations, on ramp providers).
• Experience integrating KYC and AML providers, and owning or building a rule based fraud or risk engine.
• Experience with rule based configuration and player segmentation: defining segments, resolving conflicts between overlapping rules, and giving business users a safe way to change them without a release.
• Working knowledge of the regulatory requirements affecting deposits, withdrawals, KYC, and responsible gambling in at least two or three jurisdictions.
• Data fluency: deposit success rate, approval rate by provider and method, withdrawal processing time, chargeback rate, verification funnel conversion. You can pull these yourself.
• B2B product experience. Our users are operators and their back office staff, not only end players.

• Structured written communication in English. Russian or Ukrainian for internal team communication.

   

Nice to have

• Experience in a multi tenant white label platform serving dozens of operators at once.
• Sweepstakes or social casino experience, where purchase and redemption flows differ from classic deposit and withdrawal.
• Experience with payment orchestration platforms, smart routing, and cascading.
• Experience with Metabase or a comparable BI stack, and enough SQL to validate a number.
• Practical use of AI tooling in the product workflow for discovery, documentation, and analysis.

Your position will include:

Payments and PSP

• Own the payment roadmap across all four product lines and decide what gets built, what gets configured, and what gets refused.
• Own the internal payment gateway as a product: integration contract, provider onboarding, error handling and retries, logs, and the tooling support uses to investigate a stuck transaction.
• Own the technical and product side of PSP relationships and work with our PSP Manager, who owns commercial terms and provider selection.
• Drive deposit and withdrawal conversion: cashier UX, method visibility and ordering, error minimisation, hosted versus platform side flows, retry and cascading logic.
• Own crypto and Web3 coverage: networks, confirmations, on ramp providers, wallet based authorisation and deposits.

• Shorten the time it takes to launch a new provider by standardising the integration, so a new PSP becomes configuration rather than custom development.

   

Fraud, KYC and compliance

• Own the fraud and risk engine: rules and thresholds, risk scoring, verification flows, duplicate account and bonus abuse detection, manual review load.
• Own third party KYC and AML integrations end to end, from provider evaluation and platform requirements through rollout to operators.
• Turn licensing and jurisdictional requirements into configurable platform capability instead of per operator custom work.

• Hold the balance between fraud prevention and conversion, and defend where you put the threshold.

   

Auth and identity

• Own registration and login as a conversion product, including social and Web3 registration.
• Own the relationship between authentication and verification: what a player can do before KYC, what unlocks after it, and how that differs by jurisdiction and by operator.

• Own back office authentication, permissions, and audit logs as an operator facing product.

   

Segmentation

• Own segmentation as a shared service: how segments are defined, evaluated, and consumed across payments, limits, verification, and reporting.
• Make it usable by operators without engineering involvement: rule builder, preview and validation before a segment goes live, predictable behaviour when several segments match one player.

• Own the cost side of it: evaluation performance on large player bases and what happens when a segment changes mid-session.

   

Reporting, limits and responsible gambling

• Own operator facing financial reporting, dashboards, and export tooling.
• Own the limit framework (deposit, loss, wager, session) and geo blocking as jurisdiction aware, operator configurable capability.
• Own the responsible gambling toolset and make sure it satisfies the licences our operators hold.

What we offer

Full ownership of a product area that directly moves revenue for dozens of operators, with a dedicated engineering team behind it.

A direct line to the CPO and to top management. Decisions here take days, not quarters.

We believe that a happy team builds the best products. Here is how we support you:

• Remote & Flexible: Work from anywhere. Our core hours are 09:00/10:00 to 17:00/18:00 (Kyiv time), Mon-Fri.
• Financial Stability: Timely payment for compensation for services
• Personal Equipment Policy: equipment are provided for use to ensure comfortable and efficient work.
• Knowledge Sharing: We regularly gather to discuss new trends, share insights, and elevate one another.
• Community: At NuxGame, you will work in a team of like-minded people who are ready to support, inspire, and tackle complex challenges together.
• Creative Freedom: We encourage initiative. With us, you have the freedom of professional expression and the space to implement your ideas.
• Time-off Policy: 24 vacation days per year + 5 sick days (without medical confirmation).

• Atmosphere: A friendly environment focused on results and mutual respect, free from unnecessary bureaucracy and pressure.

   

We believe in unlocking the inner potential of each team member within an open and democratic culture.

Waiting for you on our team!

What You'll Do

• Administer, maintain, and troubleshoot Linux servers.
• Configure, upgrade, and optimize server infrastructure.
• Monitor server performance, availability, and overall health.
• Administer and maintain Nginx and/or Apache web servers.
• Configure backup solutions and participate in disaster recovery planning and implementation.
• Automate routine administrative tasks using Bash and other automation tools.

Moodle LMS Administration

• Install, configure, upgrade, and maintain Moodle LMS.
• Manage plugins, themes, and integrations.
• Monitor performance and troubleshoot application issues.

AWS Infrastructure

Work with:

• Amazon EC2
• Amazon Aurora Serverless
• Amazon RDS Proxy
• Amazon CloudWatch
• IAM, Security Groups, and AWS Secrets Manager

Database Administration

• Administer and maintain MySQL databases.

Cloudflare Administration

Configure and maintain:

• DNS
• CDN
• SSL/TLS
• Web Application Firewall (WAF)
• DDoS Protection
• Zero Trust

WordPress Administration

• Install, maintain, secure, and optimize WordPress websites.

Linux Security

• Perform Linux server hardening.
• Configure and maintain SSH security.
• Configure and manage Fail2Ban.
• Manage firewall rules.
• Ensure timely security patching and system updates.

Documentation

• Create and maintain technical documentation, infrastructure diagrams, and operational documentation.

Requirements

• 5+ years of Linux system administration experience.
• Experience administering enterprise Linux environments.
• Hands-on experience administering Moodle LMS.
• Experience working with AWS.
• Experience administering MySQL databases.
• Experience configuring and managing Cloudflare.
• Experience administering WordPress websites.
• Experience with Nginx and/or Apache.
• Experience managing SSL certificates and DNS.
• Strong knowledge of Linux security and server hardening.
• Experience writing Bash scripts.
• Strong troubleshooting and problem-solving skills.
• English level Upper-Intermediate (B2) or higher (both written and spoken).

Nice to Have

• Bachelor's degree in Computer Science, Information Technology, or equivalent professional experience.
• Experience writing and maintaining technical documentation.
• Experience supporting high-availability or high-load production environments.

What We Offer

• Fully remote position.
• Salary: USD 2,500–3,700 DOE (Depending on Experience).
• Opportunity to work on a long-term product.
• The opportunity to help shape and improve our infrastructure while implementing new technologies.
• Small, collaborative team with a high level of ownership and autonomy.
• Working hours aligned with Pacific Time (US).
• Participation in an on-call rotation.

Important

This role requires working during US Pacific Time (PT) business hours and participating in an on-call rotation.

When applying, please include a short cover letter in English confirming:

• Your willingness to work during US Pacific Time hours.
• Your willingness to participate in the on-call rotation.
• Your English proficiency level.
• Your ability to communicate confidently in English, both verbally and in writing.

Please note: This position requires English proficiency at Upper-Intermediate (B2) level or higher, as you will regularly communicate with English-speaking colleagues, participate in meetings, and prepare technical documentation.

Who We Are

PAR Stuzo, with its Open Commerce® product suite and patent pending Wallet Steering® System, empowers Convenience & Fuel Retailers to gain more share of wallet and customer lifetime value than possible with any other solution provider. Stuzo’s unified Open Commerce product suite consists of: Activate for Intelligent 1:1 Loyalty, Transact for Contactless Commerce, and Experience for Cross-Channel Customer Experiences. Stuzo’s solutions are supported by a set of subscription-based program management services and are contractually backed by its 1.5X Performance Guarantee.  

Who You Are:

We are seeking a skilled and proactive Support Engineer Scan Data with expertise in Node.js and intermediate SQL to join our team. The ideal candidate will be responsible for managing the day-to-day operations of our scan data processes, submitting files, correcting errors, and ensuring the smooth running of our systems. Proficiency in Python is a plus.

Responsibilities + Activities:

- Oversee and manage week-over-week and day-over-day scan data processes to ensure the timely submission and processing of data files.
- Monitor system performance and respond to issues promptly to maintain smooth operations.
- Other operational tasks as assigned by management.
File Management:
- Submit and manage scan data files, ensuring accuracy and completeness.
- Identify, diagnose, and correct errors in file submissions and data processing.
System Maintenance:
- Perform regular maintenance tasks to ensure the reliability and performance of scan data systems.
- Troubleshoot and resolve technical issues related to Node.js applications and SQL databases used in scan data processing.
Development and Scripting:
- Develop and maintain scripts and tools using Node.js to automate routine tasks and improve operational efficiency for scan data processes.
- Utilize intermediate SQL skills to manage and query databases effectively, ensuring accurate scan data handling.
- Python knowledge is a plus for additional scripting and automation tasks.
Documentation:
- Document all operational procedures, error corrections, and maintenance activities meticulously.
- Maintain detailed records of system configurations, changes, and troubleshooting steps specific to scan data operations.
Collaboration and Communication:
- Work closely with other technical staff, third parties, support teams, and clients to address technical issues and requirements related to scan data.
- Communicate effectively with stakeholders to provide updates and gather feedback on scan data processes.
 

Experience & Skills You’ll Need:

- Bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field; or equivalent experience.
- Proven experience as a Support Engineer or in a similar operational role, with a focus on scan data solutions or similar systems.
- Experience with Node.js development and intermediate SQL.
- Proficiency in Node.js for developing and maintaining applications and scripts for scan data processes.
- Intermediate SQL skills for querying and updating data, specifically for scan data.
- Familiarity with SFTP, POS systems, and data processing workflows.
- Basic understanding of Python is a plus.
- Excellent documentation skills with a keen eye for detail.
- Ability to create clear and concise technical documents, user manuals, and procedural guides specific to scan data operations.
- Familiarity with scan data processes with consumer packaged goods. 
- Proficiency in managing and utilizing UPC codes and maintaining comprehensive product catalogs.

Will be a plus:

Certifications in relevant technical fields (e.g., Microsoft SQL Server, AWS Certified Developer).

We offer:

- Long-term employment;

- Competitive compensation with regular performance based salary and career development reviews;

- Flexible working hours;

- Unique and friendly environment where everyone can explore and learn new technologies.

Who We Are

PAR Retail, with its Open Commerce® product suite and patent pending Wallet Steering® System, empowers Convenience & Fuel Retailers to gain more share of wallet and customer lifetime value than possible with any other solution provider. PAR Retail’s unified Open Commerce product suite consists of: Activate for Intelligent 1:1 Loyalty, Transact for Contactless Commerce, and Experience for Cross-Channel Customer Experiences. PAR Retail’s solutions are supported by a set of subscription-based program management services and are contractually backed by its 1.5X Performance Guarantee.

Technology Stack:

Ruby, Ruby on Rails, Postgres, Redis, Sidekiq, GraphQl, RabbitMQ

Requirements:

- Practical experience building systems in Ruby on Rails

- At least 6 years industry experience or equivalent

- Experience building and maintaining backend APIs, including design, implementation, evolution, and maintenance

- Familiarity with TypeScript, or similar modern strongly-typed language

- Proficiency using a variety of database technologies, both relational and non-relational

- Strong understanding and familiarity with CI/CD pipelines and automated tests

- An ability to work in service-based architectures as well as well-factored Rails monolith applications

- Highly independent and able to effectively self-organize and prioritize work

- The ability to write clean code, and the discipline to write effective automated tests to deliver high-quality system improvements

- An ability to effectively break down larger bodies of work for delivery as a series of small, self-contained changes to the system

- Excellent spoken and written communication skills

- BS/MS degree in Computer Science, Engineering, or equivalent years of professional working experience

Bonus Points

- Experience with NodeJS and React

- Experience in the retail and/or fuel & convenience industries

- Experience working in distributed teams

- Experience with Nest.js and/or GraphQL

Responsibilities:

- Collaborate closely with other Engineers, design and implement new functionality based on product objectives and requirements.

- Work with the broader product engineering team to plan and coordinate feature and functionality improvements, as well as resolve bugs and execute technical enhancements, that cross-cut large parts of our platform.

- Work to continually learn, improve technology skills, expand knowledge of the our platform technologies, and gain increasing versatility across the breadth of our platform systems.

- Expand APIs and business logic, and as needed write or revise customer-facing API documentation.

- Work with our infrastructure team to enable and enhance highly-available, performant, and well-instrumented backend applications and services that run in our customer environments at substantial scale.

- Support operations and infrastructure teams for issue resolution on relevant applications or services running in production environments.

PAR Retail Offers:

- Long-term employment;

- Competitive compensation with regular performance-based salary and career development reviews;

- Paid vacations and sick leaves;

- Flexible working hours;

- A unique and friendly environment where everyone can explore and learn new technologies.

Who We Are 

PAR Retail, with its Open Commerce® product suite and patent pending Wallet Steering® System, empowers Convenience & Fuel Retailers to gain more share of wallet and customer lifetime value than possible with any other solution provider. PAR Retail’s unified Open Commerce product suite consists of: Activate for Intelligent 1:1 Loyalty, Transact for Contactless Commerce, and Experience for Cross-Channel Customer Experiences. PAR Retail’s solutions are supported by a set of subscription-based program management services and are contractually backed by its 1.5X Performance Guarantee. 

Requirements:  
- Operational knowledge of modern operating systems and networking; 

- Experience with common cloud services: AWS, GCP, and Azure; 

- Network Security and expertise in network pentesting; 

- Security testing of web applications, web services, mobile apps (hybrid and native), and IT infrastructure; 

- Understanding security certifications (PCI DSS / SOC2); 

- Ability to apply modern Application Security methodologies and frameworks; 

- Ability to use at least one modern programming language; 

- Practical experience with Burp Suite; 

- Experience with IDS, IPS, SIEM configuration; 

- Upper-intermediate English level. 

Responsibilities:  

- Requirements analysis, performing penetration testing and security audit; 

- BE, WEB, cloud and mobile clients testing; 

- Vulnerability reporting and remediation process; 

- Communication with development and project management teams; 

- Prepare security testing reports; 

- Prepare and support internal documentation for the project. 

PAR Retail Offers: 

- Long-term employment; 

- Competitive compensation with regular performance-based salary and career development reviews; 

- Paid vacations and sick leaves; 

- Health insurance program; 

- Flexible working hours; 

- Sponsored company educational program, corporate library; 

- Funny celebrations, team outings, and company events; 

- A unique and friendly environment where everyone can explore and learn new technologies. 

Overview 

Come join us as we scale our retail and commerce loyalty platform! PAR Retail is looking for a Senior NodeJS engineer on its expanding product engineering team as we build and grow our Open Commerce enterprise software-as-a-service platform. 

Open Commerce is a technology suite that enables marketing professionals in the fuel & convenience industry to create real-time, hyper-personalized offers and customer interactions across a variety of channels (mobile, web, SMS, and in-person) to drive customer behavior toward a desired goal. 

Our technology bridges financial payment providers, retail fuel pump technology, and customer experience by wrapping low-level standards-compliant integrations with powerful software abstractions on an ultra-modern software platform. Our platform services and applications are built using a broad swath of technologies (Typescript, NodeJS, Ruby, React, and others), interconnected via GraphQL and RabbitMQ, and run in AWS using Terraform, Helm and Kubernetes (via EKS). 

PAR Retail has its headquarters in Philadelphia, Pennsylvania (USA) and leverages a diverse distributed product engineering and operations team across the United States and Ukraine. PAR Retail offers highly competitive compensation and benefits, as well as an engineering-friendly and product-centric culture. On PAR Retail’s Open Commerce team, we embrace a deeply collaborative software product development process where engineering, design, and product collaborate to shape and ship new functionality. 

Successful candidates will enjoy PAR Retail’s friendly and flexible culture, and embrace our relentless drive to excellence and goal of providing the #1 retail marketing platform in the fuel & convenience industry and beyond. 

Responsibilities 

• Working with the team, design and implement new functionality based on product objectives and requirements. 
• Work with the broader product engineering team to plan and coordinate feature and functionality improvements, as well as resolve bugs and execute technical enhancements, that cross-cut large parts of our platform. 
• Work to continually learn, improve technology skills, expand knowledge of the Open Commerce platform technologies, and gain increasing versatility across the breadth of our platform systems. 
• Expand APIs and business logic, and as needed write or revise customer-facing API documentation. 
• Work with our infrastructure team to enable and enhance highly-available, performant, and well-instrumented backend applications and services that run in our customer environments at substantial scale. 

• Support operations and infrastructure teams for issue resolution on relevant Open Commerce applications or services running in production environments. 

   

Qualifications 

• Practical experience building systems in Node.js 
• At least 5 years industry experience or equivalent 
• Experience building and maintaining backend APIs, including design, implementation, evolution, and maintenance 
• Familiarity with TypeScript, or similar modern strongly-typed language 
• Proficiency using both relational and non-relational database technologies 
• Strong understanding and familiarity with CI/CD pipelines and automated testing 
• Basic knowledge Docker and Kubernetes 
• Familiarity with OAuth and JWT 
• Some experience with front-end JS technologies, esp. React or Angular 
• An ability to work in service-based architectures 
• Highly independent and able to effectively self-organize and prioritize work 
• The ability to write clean code, and the discipline to write effective automated unit tests in order to deliver high-quality system improvements 
• An ability to effectively break down larger bodies of work for delivery as a series of small, self-contained changes to the system 
• Excellent spoken and written communication skills 

• BS/MS degree in Computer Science, Engineering, or equivalent years of professional working experience 

   

Bonus Points 

• Experience with Nest.js and/or GraphQL 
• Experience with Ruby on Rails 
• Experience with AWS 
• Experience working in distributed teams 

• Experience in the retail and/or fuel & convenience industries 

   

PAR Retail Offers:

- Long-term employment;

- Competitive compensation with regular performance-based salary and career development reviews;

- Paid vacations and sick leaves;

- Flexible working hours;

- A unique and friendly environment where everyone can explore and learn new technologies.

Important: after confirming your application on this platform, you’ll receive an email with the next step: completing your application on our internal site, LaunchPod. So keep an eye on your inbox and don’t miss this step — without it, the process can’t move forward.

Why join us

If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you! :)

About the role

We are looking for a ServiceNow Discovery Engineer to join an enterprise-scale Discovery Engineering squad that executes discovery across millions of infrastructure targets on daily and weekly schedules. You will design and build AI agents that analyze Discovery logs, classify failures, identify root causes, and generate corrections to Discovery probes and patterns with appropriate testing guardrails, while also developing observability agents that continuously assess MID Server health, throughput, and coverage. The role requires 4+ years of hands-on ServiceNow Discovery experience including MID Servers, Patterns/Probes, and CMDB/CSDM data quality.

What you will do

• Design and build AI agents that continuously analyze Discovery logs, execution results, errors, and failed discoveries at scale.
• Develop agents capable of classifying and correlating failures, performing troubleshooting, identifying probable root causes, and recommending corrective actions.
• Build capabilities for agents to analyze and recommend or generate corrections to ServiceNow Discovery probes and patterns, with appropriate testing, guardrails, and human approval before production changes.
• Convert operational knowledge, runbooks, and recurring troubleshooting procedures into reusable agentic workflows, progressively reducing manual investigation and improving Discovery reliability.
• Design and build AI agents that continuously assess the health of the ServiceNow Discovery ecosystem, including MID Servers, discovery schedules/playbooks, target execution, throughput, latency, failures, retries, and discovery coverage.
• Develop agents that regularly collect, aggregate, and interpret metrics and telemetry from ServiceNow Discovery, MID Servers, logs, monitoring platforms, and other relevant data sources.

Must haves

• Hands-on experience with ServiceNow Discovery of at least 4 years, including MID Servers, Discovery Patterns/Probes, credentials, schedules, Discovery Status, ECC Queue, and troubleshooting Discovery failures.
• Experience developing or modifying ServiceNow Discovery Patterns and Probes and understanding how infrastructure attributes and relationships are discovered.
• Experience with ServiceNow CMDB/CSDM, Configuration Items (CIs), identification/reconciliation, relationships, and CMDB data quality.
• Experience with observability technologies such as Prometheus, OpenTelemetry, and Grafana.
• Upper-intermediate English level.

Nice to haves

• Advanced Python development experience and REST API design capabilities with experience building APIs, data-processing pipelines, integrations, automation, and production-grade engineering solutions.
• Strong experience with modern software development and SDLC practices and toolchains, including Git/GitHub, Jenkins or equivalent CI/CD platforms, artifact repositories, automated testing, code quality/security scanning, release management, and deployment automation.
• Practical experience integrating Gen AI APIs into software applications (e.g., OpenAI, Anthropic) and a working understanding of developer-level concepts like Retrieval-Augmented Generation (RAG) and Vector databases. (Note: We need software builders, not Machine Learning researchers).
• Practical knowledge of Infrastructure Engineering with Linux, Windows Server, compute, virtualization/cloud infrastructure, authentication, processes/services, and infrastructure troubleshooting.
• Working knowledge of TCP/IP, DNS, routing, firewalls, ports, SSH, WMI/WinRM, SNMP, HTTP/S, and common network and infrastructure troubleshooting techniques.
• Experience with high-volume logs, metrics, errors, and operational datasets to identify patterns, anomalies, trends, and root causes and turn them into actionable engineering improvements.

The benefits of joining us

• Professional growth: Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps
• Competitive compensation: We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities
• A selection of exciting projects: Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands
• Flextime: Tailor your schedule for an optimal work-life balance, by having the options of working from home and going to the office – whatever makes you the happiest and most productive.

Meet Our Recruitment Process

Asynchronous stage – An automated, self-paced track that helps us move faster and give you quicker feedback:

• Short online form to confirm basic requirements
• 30–60 minute skills assessment via Codility – a platform founded in Poland that helps us provide quicker feedback and streamline this stage of the process.
• 5-minute introduction video

Synchronous stage – Live interviews

• Technical interview with our engineering team (scheduled at your convenience)
• Final interview with your future teammates

If it’s a match — you’ll get an offer!

We’re looking for a Senior Full-Stack Engineer / System Architect for a Vienna-based SaaS company on a mission to help organizations unleash their leadership potential — through digital feedback workflows, OKRs, mentoring, and people analytics that support managers at every level. 

The Role

We're hiring a hands-on Full Stack System Architect to lead architecture for our enterprise AI SaaS platform — spanning Angular, TypeScript, Python, Node.js, cloud infrastructure, and AI/LLM integration. The product combines agentic AI workflows with precision AI tools for people analytics, leadership development, and performance management.

This is not a management role. Our six-person remote team (four full-time, spanning Austria and India) is close-knit, well-organized, and doesn't need another layer of hierarchy. We need a technical peer — a "shark in the pond" — senior enough to challenge, mentor, and upskill the team through hands-on delivery, not authority.

What You'll Do

• Own system architecture for a scalable, enterprise-grade AI SaaS platform
• Architect across the stack: Angular/TypeScript frontend, Python/Node.js backend
• Design and ship AI/LLM integrations in production, including agentic workflows
• Take direct ownership of project streams and sprints
• Expand the team's use of AI-assisted tooling (we currently use Claude for coding and design)
• Mentor and gently challenge the team, raising standards without disrupting trust
• Manage infrastructure: cloud, CI/CD, Docker, Kubernetes, Terraform

What We're Looking For

• Proven scalable SaaS system architecture experience
• Strong Angular + TypeScript and Python + Node.js expertise
• Track record integrating AI/LLMs into production
• Solid cloud, CI/CD, Docker, Kubernetes, Terraform skills
• Strong technical leadership with genuine hands-on delivery — a senior IC, not a manager
• A collaborator who values cultural fit and trust, and can integrate into an established remote team rather than restructure it
• Nice-to-have: HR-tech / people-analytics domain experience; experience mentoring engineers remotely

Practical Details

• Full-time, flexible start 7:00–10:00 AM Vienna time
• Fully remote — anywhere in Europe or safe zones in Ukraine
• Full GDPR compliance, VPN and two-factor authentication required
• Joining a 6-person engineering team led by a strong 26-year-old lead engineer

Equal opportunity — we welcome applicants of all genders and backgrounds; our engineering team is currently male-dominated and we're working to change that.

We are looking for an experienced and data-driven Product Manager to join our team and lead the development and optimization of our website growth strategy. In this role, you will drive conversion, improve user journeys, lead data-driven experiments, and identify high-impact opportunities across the funnel. Working closely with marketing, product, design, SEO, and engineering teams, you will help turn user insights into measurable business growth while building a culture of continuous experimentation and performance improvement.

Responsibilities

• Develop and own the website growth strategy and roadmap, aligning initiatives with product and marketing goals
• Identify opportunities to increase conversion from visit to registration through analysis of user behavior and funnel performance
• Detect friction points in the registration flow and implement solutions to improve completion rates
• Plan, launch, and analyze continuous A/B tests and growth experiments to validate hypotheses and improve key metrics
• Optimize landing pages, onboarding flows, and overall user journeys to improve engagement and conversion
• Implement and monitor technical SEO improvements to increase organic visibility and site discoverability
• Improve page speed, site performance, and overall technical health of the website in collaboration with engineering teams
• Analyze behavioral data, user sessions, and funnel drop-offs to identify actionable insights
• Work closely with marketing, SEO, design, product, and engineering teams (to implement growth initiatives)
• Build a data-driven experimentation culture

Requirements

• 3+ years of experience as a Product Manager
• Experience working on web products or growth funnels
• Strong analytical and data-driven mindset
• Strong understanding of UI/UX principles and conversion-oriented design.
• Experience improving conversion funnels
• Experience running A/B tests or experimentation programs
• Understanding of SEO fundamentals
• Experience working with web analytics tools
• Ability to identify user behavior patterns and growth opportunities

• Strong ownership and ability to drive initiatives end-to-end

   

Will be a plus

• Experience in fintech, trading, or crypto
• Experience with high-traffic B2C websites
• Understanding of technical SEO
• Experience improving website performance and page speed 

We offer

• 20 paid vacation days per year
• 10 paid sick leave days per year
• Public holidays as per the company’s approved Public holiday list
• Medical insurance
• Opportunity to work remotely
• Professional education budget
• Language learning budget

• Wellness budget (gym membership, sports gear and related expenses)

   

Join our team to realize your potential and grow together with JustMarkets!