Jobs at Djinni

The Mission

Wallee Group is a leader in advanced payment solutions, dedicated to providing robust, scalable, and secure systems across multiple domains. We enhance customer experiences through innovative payment and finance technology that empowers businesses to grow efficiently. With operations spanning several countries, we thrive on collaboration and agility, utilizing the Scrum framework to drive our international teams. At Wallee, we stay at the forefront of market trends, continuously innovating to deliver premier services to our global customers.

The Role

To achieve our mission of providing the market's best payment experience, Wallee is seeking experienced and versatile java software engineers. As disruptors in the payment space, we build industry-leading systems that demand the highest standards of security and reliability. We are constantly pushing our solutions into new territories, and we are looking for engineers who thrive in a fast-paced, agile environment to help us redefine the future of finance.

Tasks

Your Impact

• Architect Scalability: Design and develop highly resilient back-end systems using Java, ensuring our infrastructure handles global scale with ease.
• Feature Innovation: Own the end-to-end lifecycle of new features, from initial implementation to refined bug fixing and performance tuning.
• Collaborative Engineering: Work closely with product managers, UX designers, and QA to translate complex business needs into elegant technical solutions.
• Code Excellence: Drive quality through automated testing, rigorous code reviews, and the creation of clear, maintainable technical documentation.
• Stay Ahead: Continuously research and evaluate emerging technologies and methodologies to keep Wallee at the cutting edge of the fintech industry.

Requirements

What You Bring to the Table

• Technical Depth: Advanced proficiency in Java and core frameworks such as Spring, Spring Boot, and Hibernate.
• Systems Thinking: Proven experience building distributed systems and scalable, high-availability solutions.
• Data Mastery: Strong proficiency in SQL and experience managing complex data structures.
• Modern DevOps: Hands-on experience with CI/CD pipelines (Jenkins/GitLab CI) and containerization (Docker, AWS ECS).
• Agile Mindset: A degree in Computer Science (or equivalent experience) and a track record of thriving in fast-paced, Agile environments.

• Bonus Points: Experience with JavaScript, Apache Camel, or BPM engines.

   

  Benefits:

• You are part of an agile, young international team and shape our products sustainably with your ideas.
• You will play a decisive role in designing products in an omni channel payment start-up and work with leading companies in the financial industry on international projects.
• We offer flexible structures and flat hierarchies.
• Cooperation with motivated colleagues and numerous personal development opportunities.

Job Title:

Senior Data 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:

The product brings together data about employees, devices, applications, and IT operations to help organizations understand and improve the digital workplace experience. It combines information from multiple systems into a consolidated view, enabling IT teams to identify issues, analyze trends, and take action.

Its underlying platform ingests continuously changing data, normalizes it, and maintains relationships between employees, departments, devices, and organizational structures. Role-based access controls govern how that information is used. The engineering challenge is to make high-volume data flows reliable and efficient while providing low-latency access to current information.

About the Role:

As a Senior Data Engineer, you will build the streaming pipelines and distributed services that support this platform. This is a hands-on role centered on Java, Kafka, and Apache Flink. You will work from product requirements and architectural direction while owning complex implementation decisions, identifying risks early, and delivering production-ready components with minimal supervision.

You will join a small team developing the product and work with architecture, product, and DevOps colleagues. Early work includes understanding existing schemas and data sources, planning how data enters the platform, defining transformations and aggregations, and implementing, testing, and deploying those flows. The role involves substantial work on throughput, latency, persistence, reliability, and the operational behavior of systems processing data at scale.

Key Responsibilities:

• Build and maintain production Java services and high-throughput data-processing components.
• Design, implement, and optimize Kafka and Apache Flink pipelines that combine data from multiple sources.
• Plan and implement data flows, including ingestion, normalization, calculation, aggregation, and persistence.
• Develop the data model and services for employees, departments, devices, organizational relationships, and role-based access control.
• Build service interfaces and data contracts using technologies such as gRPC and Protobuf.
• Design persistence and data-access patterns across relational, analytical, and in-memory systems, including PostgreSQL, ClickHouse, and Redis where appropriate.
• Optimize schemas, queries, indexes, partitioning, and ingestion for large datasets.
• Diagnose bottlenecks and production incidents across streaming pipelines, services, and databases.
• Improve scalability, reliability, observability, throughput, latency, and operational cost.
• Use AI-assisted development tools while independently reviewing their output for correctness, security, and maintainability.

Required Competence and Skills:

• Typically 10+ years of experience building and maintaining production systems, including substantial hands-on work with distributed, high-throughput data platforms.
• Typically 5+ years of professional Java experience, with a strong grasp of concurrency, memory management, and JVM performance tuning.
• Typically 3+ years of production Kafka experience, including partitioning, consumer groups, schemas, delivery guarantees, fault tolerance, and throughput tuning.
• Typically 2+ years of production Apache Flink experience, including stateful processing, windowing, checkpointing, backpressure, fault recovery, and pipeline optimization.
• Experience building and operating systems that process millions of events per minute, with direct ownership of scaling or production performance decisions.
• Strong data-modeling and database optimization skills, including work with time-series data, high-volume ingestion, analytical workloads, and PostgreSQL or another relational database.
• Experience with Protobuf, schema evolution, and compatibility in distributed systems; familiarity with gRPC and service-to-service communication.
• Hands-on experience monitoring, troubleshooting, and improving distributed production workloads, including incident resolution and resource management.
• Practical use of AI-assisted or agentic coding tools, paired with critical review of generated code before production use.
• Ability to own complex components independently, assess technical tradeoffs, and deliver maintainable solutions.

Nice to Have:

• Experience with ClickHouse or a comparable large-scale analytical database.
• Practical familiarity with CI/CD, Docker, Kubernetes, and production observability.
• Experience with TypeScript and React, including backend services or user-facing applications.
• Experience unifying data from multiple sources in Kafka-based pipelines.
• Experience with real-time analytics, anomaly detection, or complex event processing.
• Experience integrating AI or LLM-based capabilities, agentic workflows, or tool-based automation into production systems.

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.

Responsibilities

• Maintain and extend existing functionality in a large legacy PHP 7.4 codebase.
• Design and implement robust solutions for bug fixes, new features, and technical debt reduction.
• Optimize database queries and schema design using PostgreSQL.
• Refactor old modules and participate in gradual modernization plans.
• Collaborate with DevOps and QA to ensure system stability and deployment continuity.
• Participate in technical discussions, code reviews, and architecture planning.
• Work closely with cross-functional teams including product managers and front-end developers.

Requirements

• 5+ years of experience with PHP, including work with legacy systems (ideally PHP 7.x).
• Strong proficiency with PostgreSQL or similar relational databases.
• Deep understanding of object-oriented programming, software design patterns, and MVC architecture.
• Experience with RESTful APIs and integration of third-party services.
• Version control with Git.
• Strong debugging and performance profiling skills.

As A Plus

• Knowledge of Python for scripting or integration purposes.
• Experience working with SOAP web services and legacy protocols.
• Familiarity with WebSockets and TCP socket-level communication.
• Exposure to systems migration, re-architecture, or code modernization projects.

We Offer

• Competitive salary
• Flexible schedule
• Social package
• Courses, webinars, and seminars to increase professional skills
• Possibility to work remotely and onsite
• Horizontal hierarchy. No micromanagement pressure
• Open company culture where your ideas and initiatives are valued
• Regular team building & corporate events
• International projects

RedCore is an international business group that creates technological solutions for digital markets. Our products and services cover fintech, marketing, e-commerce, customer service, communications, and regulatory technologies.

We are looking for a Middle Media Buyer 

Requirements:

• Independently managing key advertising campaigns
• Optimizing advertising campaigns
• Scaling campaigns
• Analyzing performance drops and promptly resolving issues
• Preparing regular performance reports and forecasting results
• Working with creatives
• Communicating with clients and contractors
• Monitoring deadlines and account balances
• Identifying opportunities to increase advertising budgets
• Developing existing partnerships

Requirements:

• Understands the company’s main advertising formats (banners, pre-rolls, bloggers, streamers, special projects, etc.).
• Follows the approved communication workflow.
• Prepares reports using existing templates.
• Has basic working knowledge of Excel and Google Sheets.
• Monitors campaign statuses and handles operational tasks.
• Understands basic marketing metrics (CPM, CPC, CTR, reach, and frequency).
• Uses the CRM and internal systems accurately and without errors.
• Updates campaign information in a timely manner.
• Monitors advertising budgets.
• Monitors creative performance and analyzes results.

Benefits

🍀 An exciting and challenging job in a fast-growing business group, 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;

📍Beautiful offices in Warsaw, Limassol, Yerevan — work remotely or on-site with comfort and enjoy the opportunity to build a network of connections with professionals day by day;

🧑‍💻Modern corporate equipment based on macOS or Windows and additional equipment are provided;

🏖Paid vacations, sick leave, personal event days, days off;

👨‍⚕️Corporate health insurance program for your well-being;

💵Referral program — enjoy cooperation with your colleagues and get a bonus;

📚Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences;

💁🏼‍♀️Rewards program for mentoring and coaching colleagues;

✈️In-house Travel Service;

🦄Multiple internal activities: online platform for employees with quests, gamification, presents and news, RedCore clubs for movie/book/pets lovers, special office days dedicated to holidays;

🎳Company events, team buildings.

We're looking for a mid-senior Backend Engineer with strong Go and PostgreSQL skills. You'll join an early-stage, venture-backed startup as one of its first backend hires. The company is building a TikTok-style endless scroll of user-generated hypercasual mini-games. Your job is to build the core services behind the game feed, user data and content delivery, and to shape the product's technical direction for years to come. This is a founding-level role with real ownership, for someone who wants to build from the ground up and not maintain someone else's system.

Details: 

• Location: Sofia, Bulgaria, on-site 5 days a week
• Employment: Full-time (no contractor, consultant or B2B setups)
• Level: Mid-Senior
• Relocation: Supported for strong candidates (1–1.5 months' notice maximum)

What you'll do

• Design and build the Go services that power the game feed, user data and content delivery
• Own PostgreSQL schema design and query performance as the product scales
• Own deployments and keep services reliable (Linux, Docker)
• Set up observability (logging, metrics, tracing) from day one
• Work on data pipelines and recommendation / feed-ranking logic
• Design REST APIs for iOS and Android clients
• Work closely with the founders on technical and product direction

Tech stack

Go, Fiber, PostgreSQL, Docker, Linux, REST APIs, data pipelines, recommendation systems

Requirements

• 3+ years of production Go experience, having shipped and maintained services under real traffic
• Solid PostgreSQL experience beyond basic CRUD, including schema design and query optimisation
• Hands-on experience with Linux and Docker, including owning deployments
• Based in Sofia or willing to relocate there
• Ready for full-time, 5-day on-site work

Nice to have

• Experience with recommendation systems, feed ranking or ML-adjacent data pipelines
• Background in hyper-casual gaming or rapid-prototyping environments
• Experience designing APIs for mobile clients
• A startup or founder-led mindset, comfortable with speed and ambiguity

Hiring process

1. Online interview to discuss your experience and mutual fit
2. In-person technical challenge and interview at the Sofia office

We're looking for a Business Development Manager who will take ownership of acquiring new B2B clients in Europe and the UK and run the full sales cycle, from first contact to signed contract.

The company is a payment platform licensed in the UK, Canada, and Malta. It brings forex, crypto, acquiring, multi-currency IBANs, and banking for businesses and individuals together on one platform.
 

Responsibilities:

• Finding and acquiring new B2B clients, from outreach to closing the deal;
• Independent hunting: finding creative ways to reach hard-to-access clients;
• Selling the platform's products: multi-currency IBANs, acquiring and checkout, forex and crypto solutions, business banking;
• Working with clients from low-, medium- and high-risk niches: crypto, forex, iGaming, dating, travel, adult;
• Researching target industries and tailoring solutions to each client's needs;
• Running meetings and presentations for prospective clients;
• Collaborating with Account Management, Support, Compliance and Operations teams;
• Keeping the CRM up to date and reporting regularly to the Head of Department.
   

Requirements:

• 2+ years of experience in international B2B sales;
• Sales experience at an EMI, PSP, payment orchestrator, crypto or forex company, or experience selling complex B2B products (subscriptions, B2B platforms, affiliate programs) in adjacent industries plus an interest in fintech;
• Understanding of SEPA, SWIFT, Visa/Mastercard card schemes, acquiring and checkout, or the ability to get up to speed quickly;
• Proven sales results backed by numbers and experience closing large deals;
• Openness to working with clients from any industry, including iGaming and adult, and from different markets;
• Initiative and autonomy in finding clients;
• English at B2+ level or higher.
   

What we offer:

• Remote work.
• Fix (3000) +bonus 
• Onboarding training on the products and fintech (about 1.5 months).
• Annual learning and certification budget.
• Regular KPI-based performance reviews.
• A transparent career path to Lead and Head roles based on strong results.
• Extra bonuses for ideas on product development.
• Public holidays based on your country's calendar.
• A results-driven culture that values outcomes over hours worked.

PrimeFox is looking for an experienced Head of CRM Retention for a new iGaming project focused on the Argentine market.

The project is preparing for launch. The product is being built on the SoftSwiss platform and will include Casino, Sportsbook and Prediction Market.

We’re looking for a strong leader with hands-on SoftSwiss experience, deep expertise in the Argentine market, and a clear understanding of how to build an effective CRM / Retention system from scratch.

Key Responsibilities

• Develop and execute the CRM / Retention strategy for Argentina.
• Build the CRM / Retention function from the ground up.
• Set up segmentation, trigger-based scenarios and automated communications.
• Design mechanics for retention, reactivation and growth of repeat deposits.
• Manage CRM campaigns, bonus offers and personalization.
• Develop Loyalty, VIP and Gamification mechanics.
• Analyze D7/D30 Retention, Repeat Deposit Rate, Reactivation, Churn, NGR and LTV.
• Optimize CRM activities based on analytics and A/B testing.
• Collaborate with Product, Affiliate, BI, Risk and Customer Support teams.
• Define KPIs, development plans and performance forecasts.
• Help build the CRM team as the project grows.

Requirements

• Proven CRM / Retention experience in iGaming in the Argentine market.
• Mandatory hands-on experience with SoftSwiss.
• Deep understanding of CRM analytics and iGaming economics.
• Experience with segmentation, automation, triggers and the player lifecycle.
• Successful track record of improving Retention, Reactivation, Repeat Deposits or NGR.
• Understanding of bonus economics and CRM campaign performance evaluation.
• Ability to independently set up the CRM / Retention function at the launch stage.
• Readiness to make decisions and take ownership of results.

Nice to Have

• Experience launching CRM / Retention from scratch.
• CRM team management.
• Casino and Sportsbook expertise.
• Experience implementing Gamification, Loyalty and VIP programs.
• Experience integrating CRM tools with SoftSwiss.

What We Offer

• The chance to launch a new iGaming brand in Argentina.
• The opportunity to build the CRM / Retention function and influence product strategy.
• Direct communication with project leadership.
• The opportunity to shape processes and grow the team.
• Competitive fixed compensation plus a performance bonus.
• Individually negotiated terms for strong candidates.

Important: we only consider candidates with real SoftSwiss and Argentina experience.

If you know how to build CRM / Retention systems, think in terms of analytics and financial results, and are ready to grow a new product from scratch, we’d love to hear from you.

Head of CRM & Retention | iGaming | LATAM (Brazil, Argentina, Colombia, Peru)

What if you could build an entire CRM function exactly the way you believe it should be done, rather than just manage one?

We are launching a new iGaming product in Brazil, Argentina, Colombia and Peru, and we are looking for a Head of CRM & Retention to join at the most exciting stage: when you can shape the product, make key decisions and build the system from the ground up.

This role is not about maintaining what already works. It is about building CRM & Retention according to your own vision, testing your hypotheses and seeing the direct impact of your decisions on real business results.

About the project
We are a startup within a well-established iGaming holding. We have our own platform, the resources to launch, strong in-house expertise and ambitious plans for LATAM. Above all, we keep bureaucracy to a minimum, make decisions quickly and give you real influence over what you create.

What you will own

• Building the CRM & Retention function from scratch, from strategy to first results
• Developing a CRM strategy for four LATAM markets
• Contributing to the development of CRM functionality on our proprietary platform
• Launching segmentation, triggers and automated flows: onboarding, deposits, retention, churn prevention and reactivation
• Designing bonus mechanics, loyalty programs, VIP and gamification
• Creating the promo calendar and communication strategy
• Analytics, A/B testing and driving Retention, LTV and NGR
• Building your own team as the project scales

What we are looking for

• Hands-on experience in CRM / Retention in iGaming or online casino
• Understanding of the LATAM market and practical experience with at least one of our GEOs
• Experience launching CRM from scratch or taking part in a new product launch
• Ability not only to build strategy but also to set up segments, triggers and CRM flows yourself
• Strong command of analytics, bonus economics and player behavior
• Fluent English
• Spanish or Portuguese is a strong advantage

Why this role

• Freedom to build: no need to adapt to someone else’s CRM strategy; you create your own.
• Early-stage product: you join before launch and help shape the product’s foundation.
• Direct impact: you work directly with the CEO, Product Lead and holding leadership.
• Fast decisions: fewer approvals, more action, experiments and results.
• LATAM focus: four high-potential markets from day one, with room to scale your solutions.
• Competitive compensation: discussed individually, based on your experience and expertise.
• Your team: the opportunity to build and grow the function your way.

Who we are really looking for
Not just a Head of CRM with an impressive CV, but someone who enjoys building, experimenting, taking ownership and seeing the results of their own decisions. If you have long wanted to build CRM & Retention your way instead of working within ready-made processes, this may be exactly the project for you.

We are looking for a User Acquisition Manager to join our team and drive user acquisition for our portfolio of mobile applications.
 

We develop and monetize our own mobile apps across different categories, including utilities (VPN, Cleaner, AI-powered apps, and more). We are looking for someone who understands the mobile app ecosystem and has hands-on experience acquiring users through in-app advertising networks.
 

Responsibilities:

• Plan, launch, and optimize user acquisition campaigns for mobile applications.
• Work with in-app advertising networks (AppLovin or similar platforms).
• Manage and scale advertising campaigns while maintaining target performance metrics.
• Analyze campaign performance, identify growth opportunities, and optimize traffic sources.
• Test different GEOs, creatives, targeting strategies, and bidding approaches.
• Monitor key performance metrics, including CPI, CPA, ROAS, retention, and LTV.
• Collaborate with the creative team to develop and test new ad creatives.
• Manage advertising budgets and focus on achieving sustainable app growth.
   

Requirements:

• 2–3+ years of experience in User Acquisition / Media Buying.
• Hands-on experience promoting mobile applications, preferably utility apps (VPN, Cleaner, AI apps, or similar products).
• Practical experience buying traffic through in-app advertising networks, such as AppLovin, Unity Ads, Mintegral, ironSource, or similar platforms.
• Understanding of mobile app monetization models and user acquisition metrics.
• Experience with campaign optimization, scaling, and budget management.
• Analytical mindset and ability to make data-driven decisions.
• Ability to work independently and take ownership of campaign performance.
   

Will be a plus:

• Experience working with subscription-based mobile applications.
• Experience with ad monetization models.
• Experience with multiple in-app traffic sources.
• Understanding of attribution tools (AppsFlyer, Adjust, Singular, etc.).
   

What we offer:

• Opportunity to work with our own portfolio of mobile applications.
• Direct influence on user acquisition strategy and campaign performance.
• Room for testing new traffic sources and scaling successful campaigns.
• Competitive compensation based on experience.
• Remote work.

We are looking for a Middle AQA to join a skilled development squad.

Responsibilities:

• Create clear and concise Test Cases
• Design and review API Integration and Functional UI tests
• Maintain existing and write new automation tests
• Analyze automation test runs
• Work on project of high complexity nature
• Work on performance testing 
• Be responsible for quality of assigned projects and products that will be delivered
• Monitor and report on quality trends such as bug churn and tracking the effects of “shift left” practices
• Maintaining testing best practices (non-automation) within the QA function across 3 teams

Requirements:

• Strong understanding of SDLC
• Strong understanding of software QA methodologies, tools, and processes
• 3+ years in Test Automation (C#), JavaScript/TypeScript
• Experience with Playwright
• Experience in testing multi-tier web applications
• Experience in Agile development and Scrum framework
• Experience with good background in API and Functional UI tests 
• Experience with AI tools and their application in software development
• Upper Intermediate English

Nice to have:

• Knowledge of Azure DevOps
• Knowledge MS SQL
• Comfortable with MS Office Applications
• Experience in performance testing
• Experience in recording test progress and results
• Basic Experience of Integration Testing
• Basic Experience with MS SharePoint
• Collaborative but decisive personal style
• ISQTB certification

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

Responsibilities: 

1. Ownership

   Be the analytics counterpart for a product domain 1:1 chat, content packs, negotiations, live streaming — you become the person PMs and engineers come to for any number in that area, and the person accountable when it's wrong.

2. Experiments

   Run A/B tests on product features, end to end Turn a product hypothesis into a test: primary and secondary metrics, the minimum effect worth detecting, and the audience. Confirm the population split and assignment events are genuinely correct before trusting the readout. Monitor it while it runs, then deliver a clear ship / don't-ship call and the reasoning behind it. This is a large part of the job, not an occasional project.

3. Pipelines

   Build and maintain the datasets behind your domain Write production transformations as SQL and YAML pipeline config, with freshness, uniqueness and validity checks. Your work goes through code review like any engineer's.

4. Events

   Specify instrumentation before it's built Write the BI event spec for new features across Android, iOS and Web; then verify after release that events actually fire the way the spec said, and chase the gaps when they don't.

5. Dashboards

   Own dashboards and the models under them

   Including retiring the ones nobody opens. A dashboard with no reader is a cost, not an asset.

6. Analysis

   Investigate what moved and why Revenue and conversion anomalies, feature performance, behavioural questions from PMs. Present findings to people who will act on them.

7. Incidents Size production incidents under time pressure When something breaks, you're asked how many users were affected and for how long — quickly, and precisely enough to defend the number when engineering disagrees with it.
8. Cost Keep query and pipeline cost honest Partitioning, clustering, and knowing why a query scans what it scans. Warehouse capacity is shared and finite; an expensive pipeline is everyone's problem.

Requirements:

• Advanced SQL, including window functions and multi-source joins — and the ability to reason about what a query costs, not only whether it returns.
• A strong experimentation background. Hypothesis testing, confidence intervals, power and minimum detectable effect — and the failure modes: peeking at a running test, multiple comparisons, hunting for a segment where the result works. You should also be the kind of person who checks that the experiment itself is sound before trusting its numbers.
• 3+ years as a product or data analyst on consumer products, with real exposure to both mobile and web.
• Critical use of AI analytics tooling. We use an internal Claude-based layer over BigQuery heavily. We want someone who checks what it produces before passing it on.
• Comfort shipping code: git, merge requests, reading and reviewing someone else's SQL. You'll write production pipeline code, not only notebooks and queries.
• Working knowledge of product event tracking: what a well-specified event looks like, and why the same event behaves differently across platforms.
• English at B1 or above. You'll write specifications that engineers build from and present findings to product stakeholders, so clear written English matters more than fluent speech.

Strong advantage

• BigQuery specifically — partitioned tables, clustering, slot-based pricing.
• Airflow, dbt, or another orchestrated transformation framework.
• Having been the analyst on a production incident, not only in the post-mortem.

Nice to have

• Python with the usual statistical libraries — pandas, scipy, stats models.
• A BI tool such as Looker, Tableau, or Power BI — having built the models and dashboards, not only read them. We use Looker today but are moving off it, so the particular tool matters much less than having done the work in one.
• Data quality tooling such as Soda or Great Expectations.
• Experience in social, live-streaming, gaming or another engagement-driven consumer product.
   

We are looking for 2–3 Senior C#/.NET Developers (2–3 FTE) to join a project for a client from Finland, focused on the development of Loyalty APIs.

📍 Work model: 100% Remote

🌍 Eligible location: Poland (candidates must be based in Poland)

🗣️ Language: English C1

📅 Start date: ASAP

👥 Team size: 2–3 FTE

🔹 Responsibilities:

Develop and maintain backend APIs using C# and .NET

Build and maintain serverless solutions using Azure Functions

Work with Azure Cosmos DB as the primary NoSQL database

Develop and integrate cloud-based services

Contribute to event-driven architecture and messaging solutions

Collaborate with the team on API development and system integrations

🔹 Requirements:

Strong experience with C#

Solid experience with .NET Core / .NET 6/8

Hands-on experience with Azure Functions

Strong knowledge of Azure Cosmos DB

Good understanding of backend development and API architecture

English C1

🔹 Tech Stack:

C#, .NET 6/8, Azure Functions, Azure API Management, Azure Cosmos DB, Azure Storage, Azure Event Hub, Azure Service Bus, Azure Key Vault, Azure Active Directory, Azure Data Factory.

Additional technologies in the project ecosystem: Node.js, Express.js, TypeScript, React.js, Next.js, Redux, JWT, OIDC, Contentful.

Gensoft is hiring a hands-on Senior Data Engineer to join an AI-powered search and matching platform. Your focus will be the data pipelines that feed production search: making ingestion fast, reliable and easy to operate, and keeping the data that reaches the matching layer clean and consistent.

Engagement

• Full-time contract, 6 months to start, with a strong chance of extension
• Fully remote
• Monday to Friday, 8 hours a day, with overlap with the team’s core working hours
• Start: as soon as possible

Tech stack
Go (orchestration), PostgreSQL with pgvector, embedding models served through Amazon Bedrock.

What you’ll do

• Take over the current ingestion flow and document how it works: sources, transformations, weak points and failure scenarios
• Automate ingestion, validation, deduplication and incremental updates, and turn onboarding of new data sources into a repeatable process
• Build safe recovery mechanisms (retries, checkpoints, replay and backfill, quarantine) so that no data is lost or duplicated
• Track record counts, metadata, source identifiers and data lineage; catch schema changes and run quality checks
• Support the interfaces of the matching service and take part in improving embeddings, indexing and match quality
• Set up monitoring and alerting together with DevOps (freshness, failures, throughput, latency, cost)
• Keep tests, deployment practices and runbooks in shape so the system can be run and recovered without you
• Apply the agreed rules on data consent, access, retention and deletion, and flag any open questions early
• Work closely with Product, Engineering, DevOps and ML specialists, keep the team updated on progress

What we expect

• Proven ownership of production data pipelines, including debugging and recovering failures
• Strong SQL and PostgreSQL data modelling skills
• Practical experience with Go for orchestration and migrations
• Solid understanding of APIs, batch and async processing, schema evolution, metadata and lineage
• Experience with idempotent processing, reconciliation and safe reruns
• Hands-on work with vector search and embedding pipelines in production (search, matching or ML products)
• Ability to trace quality problems across inputs, embeddings, indexes and downstream results
• Cloud experience, automated testing, code review and disciplined deployments
• Monitoring, alerting, runbooks, privacy-aware data modelling and access control

Nice to have

• Direct experience with pgvector and Amazon Bedrock
• Experience integrating and evaluating embedding models (e.g. VoyageAI)
• Python for data processing
• Entity resolution and search relevance
• Background in HR tech or recruitment data

Hiring process
CV review, technical interview, live coding session, final interview.

Our client is looking for a talented Senior Software Engineer with strong Python and modern front-end development experience to build modern web applications with an AI-forward approach. The role focuses on developing responsive web applications and Progressive Web Apps (PWAs), using AI-powered engineering tools to improve development efficiency and integrating AI capabilities into products where they add real value.

The ideal candidate combines strong software engineering fundamentals with hands-on experience using AI tools, modern front-end frameworks, and Python. Full-stack engineers are preferred, though candidates with deep expertise in AI-driven engineering, Python, or front-end development will also be considered.
 

What You'll Do

• Build modern web applications and Progressive Web Apps using component-based frameworks and responsive design.
• Use AI coding tools and agents daily to accelerate development, testing, code review, and implementation.
• Integrate AI capabilities, including LLM APIs, retrieval-augmented generation (RAG), and agent workflows, into products.
• Build and extend Python services and APIs, translating backend contracts into maintainable client-side models.
• Collaborate with product, design, and backend teams to deliver reliable applications and establish engineering standards.
   

What We're Looking For

• Strong software engineering and problem-solving skills.
• An AI-forward mindset, with practical experience using AI tools to improve development speed and quality.
• Solid Python experience.
• Strong JavaScript/TypeScript, HTML, and CSS skills, with experience in Svelte/SvelteKit, React, or a comparable modern framework.
• Strong full-stack debugging skills across browser tooling, networking, services, and build systems.
   

Preferred

• Full-stack experience across front-end and Python back-end development.
• Experience building LLM-powered features, including prompt engineering, tool use, and RAG.
• Experience with Progressive Web Apps, including service workers, offline support, caching, and iOS/Android platform differences.
• Experience with Tailwind CSS.
   

What We Offer

• Competitive market salary.
• Fully remote work.
• Opportunity to design and scale modern backend and cloud-native systems.
• Hands-on ownership of backend architecture and technical direction.
• Work with modern AWS, serverless, database, and search technologies.
• Collaboration with experienced international engineering teams.
• Opportunity to lead a technical team while remaining hands-on.

Job Description

• Good JavaScript / TypeScript knowledge and basic experience with modern IDEs/Dev tools (e.g., VS Code, Chrome DevTools)
• General knowledge of operating systems, REST APIs, network protocols (HTTP/HTTPS), and databases (SQL/NoSQL basics)
• Fundamental knowledge of QA tools and version control (Cypress, Mocha/Chai, Git)
• Eagerness to learn test automation, modern web testing patterns, and front-end frameworks
• Solid software testing fundamentals (test design techniques, boundary value analysis, test case creation, and clear bug reporting)
• At least intermediate English level (written and spoken)
• Good interpersonal and communication skills

Job Responsibilities

• Working closely with a Mentor on a production project
• Working with the automated end-to-end (E2E) test framework (written in JavaScript/TypeScript with Cypress) and maintaining/extending it
• Creating and maintaining automated test scripts for web applications
• Analyzing test failures, fixing broken Cypress tests, and submitting clear bug reports
• Monitoring CI/CD automation test runs and reporting results to the team
• Communicating effectively with team members and project stakeholders

Department/Project Description

Our customer operates an innovative, decentralized care model designed for patients with serious, complex, or high-risk illnesses. Rooted in the medical home model, the organization emphasizes coordinated, accessible, and continuous care led by primary care physicians, integrating medical, social, and behavioral health services to achieve comprehensive patient outcomes.

The project objective is to design, implement, and maintain robust end-to-end automation for modern web applications and API integrations across the customer's healthcare ecosystem. You will participate in developing and maintaining test plans, test cases, and Cypress automation scripts to ensure high quality and patient data reliability.