Jobs at Djinni

We are seeking a QA Engineer to own end-to-end quality assurance across our client data and reporting platform. Healthcare domain.

Responsibilities:

• Review and interpret requirements from multiple sources: Jira stories, Confluence documentation, BRDs, email threads, and stakeholder conversations
• Translate requirements into well-structured test cases covering happy paths, edge cases, and negative scenarios
• Participate in sprint planning and refinement sessions to flag testability concerns and ambiguous acceptance criteria early
• Perform data-layer validation against SQL Managed Instance in Azure: verify pipeline outputs, staging tables, transformation logic, and aggregations
• Perform presentation-layer validation in Power BI: verify measures, visuals, filters, slicers, and report behavior against expected data
• Execute UAT-level testing in a staging environment that mirrors production data and report structure
• Validate ADF (Azure Data Factory) pipeline runs: confirm correct data ingestion, transformation, and load behavior, including error and retry scenarios
• Coordinate with developers and flag regressions before UAT sign-off
• Log, triage, and track defects in Jira with clear reproduction steps, expected vs. actual results, and severity ratings
• Partner with developers and analysts to investigate root causes and validate fixes
• Produce QA summary reports for sprint reviews and release approvals

Qualifications Required:

• 5+ years in a QA or data validation role, ideally within a BI, analytics, or data engineering context
• Proficiency in SQL: comfortable writing complex queries to validate data in relational databases (Azure SQL / SQL Managed Instance experience is a plus)
• Familiarity with ETL or data pipeline concepts 
• Experience working in agile/scrum teams using Jira and Confluence
• English: Upper intermediate

Nice to Have

• Experience with test automation for data pipelines
• Hands-on experience testing Power BI reports or equivalent BI tools (Tableau, Looker, SSRS)
• Familiarity with Azure DevOps CI/CD pipelines and integrating automated tests into deployment workflows
• Experience testing ERP-adjacent data  or CRM integrations
• Scripting ability in Python for test harness development

We offer:

• Long-term contract

• 100% Remote position

Tango is a successful, marketleader, a live-streaming Platform with 450+ Million registered users, in an industry projected to reach $240 BILLION in the next couple of years. 

The B2C platform, based on the best-quality global video technology, allows millions of talented people around the world to create their own live content, engage with their fans and monetize their talents.

Tango live stream was founded in 2018 and is powered by 300+ global employees operating in a culture of growth, learning, and success!

The Tango team is a vigorous cocktail of hard workers, creative brains, energizers, geeks, overachievers, athletes, and more. We push the limits to bring our app from “one of the top” to “the leader”. 

The best way to describe Tango's work style is not to use the word “impossible”. And we believe that success is a thorny path that runs on sleepless nights, corporate parties, tough releases, and of course our users' smiles (and as we are a LIVE app, we truly get to see our users all around the world smiling right in front of us in real-time!).  

Responsibilities

• Development and support of SPA on ReactJS: web version mobile-first of a high-load application, admin panels for internal use, and marketing pages
• Collaborate with other teams to effectively meet the product and technical needs of the project
• Proactively participate in improvements and existing solutions tuning
• Share expertise and knowledge with your teammates

Requirements

• At least 5 years of commercial experience in development in JS (ES6+)/Typescript
• Strong knowledge of CSS, HTML5, SASS, Jest
• At least 2 years of commercial experience in development in with ReactJS version 16+ (hooks)
• Experience with state management frameworks: Redux and Redux toolkit preferred
• Intermediate English

What we offer:

• International company with several offices in different locations : Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social package, including sports coverage, elite medical insurance for you and family;
• 20 working days paid vacation and 100% sick leaves coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team buildings and fun activities;
• Comfortable office close to the metro station. Our Kyiv office is open 24/7 with all safety and health measures in place.

We’re looking for a hands-on Upwork Outreach/ Lead Generation Specialist  who knows how to turn bids into conversations and conversations into sales calls. No spam, no templates — only thoughtful, value-driven outreach.

Role Mission - to generate a steady flow of qualified leads from Upwork by actively bidding on relevant projects, writing personalized proposals, and engaging potential clients in direct conversations — all the way to the first sales call / negotiation stage.

Key Responsibilities

• Work hands-on with Upwork:
  • Identify and analyze relevant job postings
  • Write highly personalized bid proposals
  • Communicate with clients via Upwork messages
• Conduct direct outreach to potential clients (Upwork, LinkedIn)
• Adapt messaging based on client needs, industries, and budgets
• Manage follow-ups and maintain conversations until handoff to founder
• Track leads, statuses, and results in Google Sheets
• Analyze performance metrics:
  • Bid → reply rate
  • Reply → call conversion
  • Call → deal (in collaboration with sales)

Success Metrics (KPIs)

• Number of high-quality bids submitted per week
• Reply rate on proposals
• Number of booked calls
• Lead quality (budget fit, relevance, decision-makers)

Ideal Candidate Profile

• 6+ months of experience with Upwork bidding, outreach, or lead generation
• Strong ability to write value-driven, non-template proposals
• Ability to quickly understand client pain points from descriptions
• Written English at B2+ level
• High attention to detail, independence, and structured approach

What We Offer

• Flexible working hours 
• A collaborative and innovative work environment
• Professional growth and development opportunities
• Opportunity to work on an exciting and impactful project
• Modern office in Poznan or Kyiv
• Corporate English lessons

📩 Send us your CV — let’s build something great together!

Technical Skills:

-3+ years of commercial Golang development experience in production systems

-Strong expertise in Kubernetes, Docker, and CI/CD pipelines

-Proficiency with gRPC and Kafka for high-performance service communication and

event streaming

-Advanced database knowledge (PostgreSQL or Google Spanner) including schema

design, indexing, and query optimization

-Experience with profiling and benchmarking Go applications (pprof or similar)

-Ability to design and implement complex automated processes such as cron jobs with

dependencies, retries, and monitoring

-Skilled in writing clear API documentation and technical specifications

-Upper-Intermediate or higher English level
 

🤝 Soft Skills:

-Strong analytical and problem-solving mindset

-Collaborative, proactive, and detail-oriented approach

-Self-driven with a commitment to quality and continuous improvement

backlog.
 

📈 Relevant Experience:

-Designing and operating high-load, distributed architectures in production

environments

-Delivering scalable microservices from concept to deployment

-Working in cross-functional teams to deliver mission-critical features

-Troubleshooting and optimizing systems in real-time, high-traffic environments

-Experience with ERP domain is considered a plus

-Proven motivation to grow as an engineer, with an interest in career development and

continuous skill growth

Technical Lead — Promotional Features Tech Team “Boosters”

Focus: High-load, distributed, player-facing promo features (network promotions)

Role type: Hands-on Tech Lead (80% delivery / 20% team leadership)

Why this role

We’re scaling Playson’s Promotional Features domain and building the Boosters direction further as part of our growth. This is a hands-on leadership role where you’ll personally build and ship production-ready features and own the technical direction of the Boosters team. Performance, scalability, and reliability are non-negotiable.

Boosters is responsible for player-facing network promotional features such as:

• Tournaments
• Free Spins
• Progressive Jackpots
• Smart Prize Drop Systems

Team & Collaboration model

Tech Boosters is an end-to-end cross-functional squad including:

• Full-stack & Backend Engineers
• Automation QA & Manual QA
• SRE

Product Boosters

• Product Manager
• Product Designer
• Product Analyst

There is no classic Product Owner/PM in the squad. You’ll work with a product commercial manager who acts as the customer — defines what is needed, why and how fast it is needed on the market. Your tech team owns how it will be built and when it will be delivered.

What you bring:

• Strong proficiency in Node.js and TypeScript (our primary backend stack). We’re also open to strong backend engineers from other ecosystems (e.g., Go, Java, C#, C++) who are ready to ramp up quickly.
• Strong understanding of asynchronous programming and concurrency patterns.
• Experience building distributed systems and working with messaging and coordination tools (e.g., Kafka, RabbitMQ, NATS, distributed locks).
• Experience with gRPC in production environments.
• Solid knowledge of databases: relational (MySQL, PostgreSQL), columnar (ClickHouse), and NoSQL (DynamoDB, MongoDB).
• Experience with cloud platforms (AWS/GCP/Azure) and Kubernetes.
• Skilled in building and maintaining unit and end-to-end tests.
• Proven track record of delivering production-ready solutions.
• Experience working with large-scale microservices architectures.
• Degree in Computer Science or a related field (or equivalent practical experience).

Preferred additional qualifications:

• Understanding of application security and industry best practices.

What you will be doing:

• Own technical decisions and technical part of the products and architecture for Boosters services (hands-on, production-grade).
• Develop and maintain backend applications for promotional features.
• Drive delivery as a key contributor: tech design → implement → test → release → operate.
• Optimize existing systems for performance, scalability, and reliability in a distributed environment.
• Lead the team execution with a “PoC-first” approach: fast validation → measurable outcomes → production hardening.
• Conduct code and architectural reviews; set engineering standards and best practices.
• Be the go-to technical owner: any tech problem in the domain is your problem to solve (with the team).
• Participate in on-call rotation and continuously improve operability (monitoring, alerting, runbooks, incident reviews).
  What we offer:
• Remote-first with flexible working arrangements across Europe or Ukraine
• Competitive compensation package (with performance-based bonuses up to 50%)
• Unlimited paid vacation & sick leave (B2B model)
• Premium health insurance (for you + 1 family member)
• Learning & development support (courses, certifications, mentoring, conferences)
• International exposure — attend industry expos, team gatherings & global meetups

US working hours (5:00 PM - 2:00 AM Kyiv time)

Overview

We are looking for a Junior Account Manager to support a large-scale client outreach initiative. This role focuses on contacting existing clients, guiding them through a required merchant service PIN pad firmware upgrade, and assisting with onboarding to our internal B2B system. The position is straightforward, process-driven, and ideal for someone who is organized, communicative, and comfortable handling high-volume outreach.

Key Responsibilities

· Reach out to a high volume of existing clients (phone, email, or messaging) to coordinate firmware upgrades for merchant service PIN pads

· Clearly explain the upgrade process and its importance to clients

· Guide clients step-by-step through completing the firmware update

· Assist clients in setting up and connecting to the internal B2B system

· Track outreach progress and maintain accurate records of client status

· Follow up with clients who have not completed the upgrade

· Escalate technical issues or complex cases to the appropriate internal teams

Qualifications

· High school diploma or equivalent

· Strong communication skills (clear, friendly, and professional)

· Comfortable making a high volume of calls and sending emails daily

· Basic computer skills and ability to learn internal systems quickly

· Detail-oriented with good organizational habits

Key Skills

· Customer communication

· Persistence and follow-up

· Basic technical guidance (training will be provided)

· Time management

· Data tracking and accuracy

Our requirements:

• Fluent/Advanced English (MUST!) 

• Ability to work night shifts (6 possible schedules: 15:00 – 00.00; 16:00 – 01.00; 17:00 – 02.00; 18:00 – 03.00; 19:00 – 04.00; 21:00 – 06.00 Kyiv time)

• Confident PC user with solid knowledge of Microsoft Windows

• Technical background or strong interest in exploring software and hardware products

• Strong organizational, training, and time-management skills

• Excellent communication and active listening abilities

• Understanding of conflict resolution

• Empathy, positive attitude and self-control

Nice to Have:

• Previous experience in customer or technical support

• IT education or relevant technical background

• Familiarity with ticketing systems (Zendesk, Zoho, ServiceNow), CRM platforms, and Jira

Summary:

As a Customer Support Specialist, you will have an opportunity to join a very dynamic international team and become a trusted advisor to our clients, with the opportunity to join a dynamic international team and become a trusted advisor to our clients, contributing to the overall quality of our product by sharing feedback with an opportunity to contribute to the overall quality of our product by sharing feedback with the relevant stakeholders.  

You will interact with US business owners, learn about the telecom industry and embark on an IT career path within the organization.  

Key Responsibilities:

• Support existing and prospective customers by providing timely and accurate information about B2BSoft products

• Identify, analyze, and troubleshoot technical issues and provide effective solutions

• Respond to support queries via phone, chat, and email

• Assist customers with software and hardware configurations, billing, and merchant services–related requests

• Maintain clear and detailed documentation of all service inquiries.

We are hiring a PSP / EMI Onboarding & Relationship Manager.

If you have hands-on experience with payment solutions, merchant onboarding, PSP relationships, or fintech operations, this role might be perfect for you.   
 

What You'll Do   

• Manage onboarding with EMIs, PSPs, Banks, and acquirers - Build strong relationships with financial partners
• Support merchants/clients with payment needs & onboarding
• Prepare KYB packages, bank forms, and documentation
• Evaluate new PSPs, EMIs, and jurisdictions 
• Track progress in CRM     
   

What We're Looking For      

• 1+ year in Fintech, PSP, EMI, Payments, Acquiring, or Consulting
• Understanding of SEPA/SWIFT, acquiring basics, merchant flows
• Strong communication & relationship management skills 
• Ability to handle multiple projects at once
• English B2+- Attention to detail & problem-solving mindset        

Nice to have         
knowledge of AML/KYC, governance structures, or company formations - Experience in high-risk industries          
 

What We Offer          
100% remote role Work with global PSP, EMIs, banks & top fintech professionals Clear career growth path Dynamic, international environment        

Requirements:

• Bachelor’s or Master’s degree (Mathematics, Statistics, IT, Analytics)
• 2–3 years of experience as a Risk/Fraud/Data Analyst in anti-fraud products for iGaming or E-commerce (such as Seon, LexisNexis, Covery, Kount, Riskified, Forter, Feedzai, etc.) or experience working with these systems*
• Experience in rule engine configuration — creating, testing, and optimizing rules based on transactional and behavioral data
• Understanding of scoring principles: knowledge of risk assessment models and fraud probability evaluation methods
• Ability to work with large datasets and identify fraud patterns
• Experience in building and visualizing reports
• Strong analytical thinking and attention to detail

• English level: Upper-Intermediate or higher

   

Will be a plus:

• Experience building an anti-fraud system from scratch or optimizing an existing one
• Experience in the crypto sector
• Knowledge of basic KYC principles
   

Key Responsibilities:

• Develop and maintain scoring models for customer/transaction risk assessment
• Configure, test, and optimize risk rules
• Monitor scoring accuracy and rule efficiency metrics
• Create and maintain reporting dashboards and analytics
• Analyze fraud incidents and develop fraud prevention strategies
• Collaborate with cross-functional teams

GD Next is a European group of companies, specialising in KYC, Fraud prevention, financial messaging, and Open Banking solutions. We integrate innovative, modern technologies into the traditional financial sector to strengthen digital banking and enhance the customer experience. By combining proven, market-validated technologies with the expertise of our team and trusted partners across Europe, we deliver real and tangible value to our clients.

We are looking for a Junior Java Software Engineer to join our Open Finance project team. This is a great opportunity for aspiring developers who want to gain hands-on experience in financial technology and grow their expertise in Java development.
The role will also include participation in 24/7 project hotline support on a rotational basis for additional compensation.

Key Responsibilities:

• Develop and maintain backend services using Java and relevant frameworks.
• Assist in implementing solutions that align with OpenFinance and PSD2 standards.
• Support the integration of third-party financial institutions and payment service providers (ASPSPs).
• Work closely with senior developers and the customer project team to gather requirements, participate in design discussions, and contribute to the development process.
• Write and maintain clean, efficient, and well-documented code.
• Participate in code reviews to ensure adherence to best practices, security, and performance standards.
• Collaborate with front-end teams for seamless integration between backend and front-end components.
• Develop unit and integration tests to maintain code quality.

• Troubleshoot and debug issues in backend services.

   

Required Skills & Qualifications:

• Basic understanding of Java and hands-on experience in backend development.
• Familiarity with core Java concepts (OOP, multithreading, collections).
• Understanding of RESTful APIs and JSON.
• Knowledge of relational databases (PostgreSQL, MySQL, or similar).
• Experience using Git for version control.
• Basic understanding of web security concepts (OAuth 2.0, JWT, encryption techniques).
• Strong problem-solving skills and willingness to learn new technologies.
• Good communication and teamwork abilities.
• B2 English (Upper-intermediate or higher).

Desired Skills:

• Experience with Spring Framework (Spring Boot, Spring Security).
• Basic knowledge of cloud platforms (AWS, Azure) and containerization (Docker).
• Familiarity with CI/CD tools and deployment practices.
• Exposure to Agile methodologies (Scrum, Kanban).
• Interest in financial technology (FinTech) and willingness to learn OpenFinance and PSD2 regulations.

Additional Information:

• Candidates will have the opportunity to grow within the company and gain exposure to modern financial technologies.
• The role will include participation in 24/7 support on a rotational schedule (1 day on duty / 1 day off duty) for additional compensation.
• This is a great opportunity for junior developers to develop real-world experience in a fast-paced and innovative financial services environment.
• Location: Ukraine.
• The project language is Ukrainian.

We are looking for a Finance Manager to join United Tech and take on a key role in financial operations. This is a great opportunity to work across different finance areas, grow professionally, and advance your career in a market-leading IT company. You will be part of a supportive and knowledgeable team collaborating to ensure financial efficiency and strategic decision-making

 

In this role, you will

• Prepare financial reports and analyze financial information to support decision-making by upper management
• Conduct financial analysis to increase profits, optimize expenses, and improve cash flow
• Manage the preparation of project budgets and monitor their usage to ensure alignment with plans
• Analyze costs, pricing, variable contributions, sales results, and actual performance compared to business plans
• Oversee day-to-day financial operations within the project, including payments, requests, and other transactions
• Support the registration of bank, EMI, and PSP accounts, including handling KYC procedures, compliance, and audits
• Analyze existing financial systems and processes to identify opportunities for improvement and automation
• Implement cost-reduction strategies and improve operational efficiency
• Work closely with financial managers, treasury managers, financial controllers, legal teams, and product teams to streamline processes and ensure smooth operations
• Communicate with external partners, including banks, financial institutions, advertising networks, and merchants if needed
• Analyze costs, pricing, variable contributions, sales results and the company’s actual performance compared to the business plans
• Search for cost-reduction opportunities
• Prepare necessary information for financial statements and audits
• Provide data to potential investors and assist in due diligence when required
• Complete ad hoc tasks and participate in special projects as needed
• Perform other duties as assigned by upper management

It’s all about you

• Bachelor’s or Master’s degree in Economics, Accounting, Finance, Management, or related fields
• 2–3 years of relevant experience in an IT company, Big4, or multinational consulting, audit, or FMCG company
• Proficiency in MS Excel, Google sheets, and analytical tools (e.g., Power BI)
• Working knowledge of IFRS and accounting principles
• Strong analytical and problem-solving skills with a structured and data-driven approach
• Attention to detail, critical thinking, and the ability to make sound business decisions
• Ability to work independently, prioritize tasks, and meet deadlines in a dynamic environment
• Excellent communication skills, including written and oral proficiency in English (Upper-Intermediate or higher)
• Proactive, results-oriented, and open-minded team player with a focus on continuous process improvement

Would be a plus

• Experience with Microsoft Dynamics Business Central
• Experience in ERP system implementation
• Experience in audit would be a valuable asset

What we offer

Care and support:

• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Team building events, corporate gifts, and stylish merch
• Financial and legal support
• Maternity recovery support allowance
• Position retention and support for those who join the Armed Forces of Ukraine
• Participation in social initiatives supporting Ukraine

Comfortable working environment:

• Work from our Kyiv hub or remotely with a flexible schedule
• Modern equipment or depreciation of your own tools

Investment in your future:

• Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
• 70% of our heads and leads have grown into their roles here — so can you!
• Performance-oriented reviews and Individual Development Plans (IDPs)
• Reimbursement for professional courses and English classes
• Corporate library, book club, and knowledge-sharing events
   

Hiring process

• Intro call
• Test Task
• Hiring Team Interview
• Final Interview
• Reference check
• Polygraph
• Offer

United Tech is a global IT product company shaping the future of real-time social connection. With millions of users across North America, Europe, LATAM, and MENA, we build next-gen mobile and web apps for live-streaming and social networking. Our platforms enable connection at scale fast, interactive, and deeply engaging. The market is projected to exceed $206B by 2030, and we are already leading the evolution. Founded in Ukraine, scaling worldwide

About the product: Global video communication app, where you can meet new friends and communicate with people all over the world. You can co someone very smart, funny, pleasant, just a person of your type. But it’s always up to you whether to join chat or keep searching for another interesting person. We are proud of how many people we connect daily!

In this role, you will

• Take part in team processes (grooming, sprint planning)
• Develop and deliver product tasks to the production environment
• Work on reducing and preventing technical debt
• Create technical designs for product epics
• Decompose epics into clear, executable tasks
• Conduct technical investigations and propose solutions

It’s all about you

• 4+ years of commercial experience in backend development
• 3+ years of experience with Node.js backend development
• Experience with relational and non-relational databases (MongoDB, Postgres and Redis)
• Experience with SOA/Microservices (communication, development process)
• Experience with patterns (DDD, event-driven, SOLID, CQRS)
• Experience working with WebSockets (ws, socket.io)
• Experience working with messaging (BullMQ, RabbitMQ, Kafka)
• Experience with cloud providers (AWS, GCP, etc)
• Experience in scaling and high-load products
• Upper-Intermediate English or higher

What we offer

Care and support:

• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• Up to 10 additional days off for public holidays
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Team building events, corporate gifts, and stylish merch
• Financial and legal support
• Maternity recovery support allowance
• Position retention and support for those who join the Armed Forces of Ukraine
• Participation in social initiatives supporting Ukraine

Comfortable working environment:

• Work from our Kyiv hub or remotely with a flexible schedule
• Modern equipment or depreciation of your own tools

Investment in your future:

• Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
• 70% of our heads and leads have grown into their roles here — so can you!
• Performance-oriented reviews and Individual Development Plans (IDPs)
• Reimbursement for professional courses and English classes
• Corporate library, book club, and knowledge-sharing events

Hiring process

• Intro call
• Technical Interview
• Final Interview
• Reference check
• Offer

About Us

True Path Leads is a fast-growing performance marketing company building high-load infrastructure for lead generation at scale. We process millions of events daily across complex integrations with external partners. Quality is critical — and we're looking for a Senior Manual QA Engineer who can own it.

What We're Looking For

• 7+ years of experience in QA.
• Proven experience in web testing of high-load and complex projects within product companies.
• Experience in UI, API and mobile testing.
• Strong experience with SQL and NoSQL databases, including setting up test environments via DB.
• Practical experience with message queues.
• Ability to create clear test documentation (test cases, test plans, checklists).
• Excellent test design skills.
• Strong analytical skills — experience as a Business or System Analyst is a significant plus.
• Experience working with logging and monitoring systems.
• Strong critical thinking skills and solid understanding of client-server architecture.
• Ability to work independently.
• Attention to detail.
• Proactive attitude.

Nice to Have

• Basic knowledge of security testing practices and tools.
• Basic knowledge of automation testing.

Requirements

• Languages: English B2, Russian or Ukrainian — native.
• Located in a European time zone.

What You'll Get

• Fully remote position within a European timezone.
• Work on high-load, real-world systems with complex data flows.
• Direct collaboration with engineering and product teams.
• Fast-paced startup environment with experienced leadership.
• Competitive compensation based on experience and skill set.
• Clear growth path in a scaling product company.

About Us

At True Path Leads, we're building the next generation of performance marketing infrastructure. Our proprietary lead management platform operates at scale, processing millions of pings and leads in real time. We are expanding rapidly and looking for a highly capable Senior Backend Engineer to help design, build, and scale our core lead processing engine and supporting services.

Tech Stack

Python 3 (FastAPI) · SQL (MySQL, ClickHouse) · Kafka · AWS (EKS)

What You'll Do

• Design, build, and scale a high-load, mission-critical lead processing system in Python.
• Own architecture and implementation of backend services and APIs following Clean Architecture and SOLID principles.
• Develop real-time data pipelines using Kafka and high-performance databases (PerconaDB, ClickHouse).
• Optimize system performance, latency, and throughput under heavy load.
• Collaborate with product, engineering, and leadership to define and deliver features.
• Deploy, operate, and monitor services in AWS (EKS) using modern DevOps practices.
• Contribute to system reliability, observability, and fault tolerance.

What We're Looking For

• 10+ years of backend development experience (Python preferred).
• Proven experience building and scaling high-load / distributed systems.
• Strong SQL expertise (MySQL, ClickHouse) — query optimization, indexing, data modeling.
• Solid understanding of Kafka and event-driven architectures.
• Experience designing and maintaining REST APIs and asynchronous systems.
• Deep understanding of concurrency, networking, and performance bottlenecks.
• Hands-on experience with AWS (EKS, S3, Lambda, networking, etc.).
• Experience with observability: metrics, logging, tracing (Prometheus, VictoriaMetrics, etc.).
• Ability to take ownership and drive technical decisions.

Nice to Have

• Experience in performance marketing, lead generation, or affiliate platforms.
• Experience with real-time bidding systems or ad-tech.
• Familiarity with Kubernetes internals and production-grade deployments.

What You'll Get

• Fully remote position with flexible working hours.
• High ownership and direct impact on architecture and product direction.
• Work on systems operating at significant scale.
• Fast-paced startup environment with experienced leadership.
• Competitive compensation based on experience and skill set.
• Clear growth path toward Team Lead or Software Architect roles.

We are looking for a Senior Java Developer to join our client’s team on an outstaff basis. The project focuses on the support and further development of an existing message processing platform.

The system is built using a microservices architecture and handles high-load data flows, requiring scalability, reliability, and continuous performance improvements.

Responsibilities

• Design, develop, and maintain scalable backend services using Scala and Java
• Build and support RESTful APIs and microservices
• Design and optimize PostgreSQL databases (schemas, queries, migrations)
• Work with AWS cloud services to ensure scalable and reliable solutions
• Develop and maintain CI/CD pipelines (Jenkins, GitHub Actions)
• Ensure code quality through TDD, testing, and code reviews
• Contribute to system architecture and technical decision-making
• Collaborate with cross-functional teams in a distributed environment
• Support and improve system performance and stability
• Work on EDI / B2B integrations where applicable

Key Requirements

• Strong experience with Scala (Akka, SBT, Play/Lift)
• Experience with Java 21+ and Spring
• Solid knowledge of PostgreSQL (schema design, query optimization, migrations)
• Hands-on experience with AWS (ECS, S3, RDS, CloudWatch, Lambda)
• Strong experience in REST APIs and microservices architecture
• Experience with CI/CD pipelines (Jenkins, GitHub Actions)
• Strong understanding of TDD (unit & integration testing)
• Experience with EDI / B2B integrations is a plus
  
  Engineering Practices
• Experience working in Agile/Scrum teams (2-week sprint cadence)
• Strong communication skills for async collaboration (e.g., Slack)
• Experience working in distributed teams across time zones
• Proficiency with GitHub workflows (branching, PRs, code reviews)

• Familiarity with cloud-native deployment patterns

   

  AI-Assisted Development

• Hands-on experience with Claude AI or GitHub Copilot
• Ability to use AI tools for backend/frontend development and testing
• Experience integrating AI-assisted workflows into development processes
• Understanding of prompt engineering for code generation and review