Senior Java (Quarkus) Engineer

Описание

We’re a product powerhouse building a full-stack ecosystem for iGaming businesses.

One bet: our technology is so rock-solid that we stake our own business on it.

From our hubs in Ukraine, Georgia, the UK, and the Philippines, we blend real-world experience, a battle-tested Tech Radar , all within an open-door culture.  Turnkey isn’t just our biggest team — it’s the engine room of everything we build.

It’s the tech our partners bet their business on: no patchwork, no plug-ins.

Just one battle-tested ecosystem designed to launch, grow, and lead in the most dynamic markets.

Turnkey unites VeliHorizon (our core platform), VeliX (the experience layer), and VeliPayments — the trio powers every player's journey and operator’s next big leap.

We invite a ​​​​​​ Senior Java (Quarkus) Engineer to join the VeliHorizon  (Reward) team.

VeliHorizon — our battle-tested platform built on real gaming floors.

High-performance, microservices at its core, API-first by design — it keeps operations smooth, data sharp, and transactions flying.

Every click, spin, and payout runs through Horizon — proven in the toughest conditions, powering thousands of moments a second.

Built by cross-functional teams who own every detail — from first idea to live performance.

In this role, you will: Drive design, implement, extend, test, deliver, and maintain domain-specific business features in production.

Optimize and refactor the existing codebase and data models.

Participate in SRE activities, including monitoring, troubleshooting, production releases and housekeeping.

Respond to and investigate complex problems within the team's area of responsibility and cross-team areas by retrieving and analyzing heap dumps, logs, SQL queries, reports, and charts.

Improve internal common libraries and frameworks.

Collaborate with team members and external stakeholders to address technical and business challenges, drive the product's feature development and actively seek feedback.

Skills and experience you will need: Proficiency in Java with practical experience using Quarkus(Rest, Mutiny, Reactive PG SQL), or similar Spring Framework, Vert.x Scala development experience required.

Akka or ZIO will be a huge advantage Strong understanding of functional programming principles and best practices.

Practical experience of JVM application garbage collection, memory management, understanding and troubleshooting Solid experience with Kafka (event-driven architecture, message delivery semantics, stream processing).

Strong command of relational databases, especially PostgreSQL.

Experience designing and maintaining RESTful HTTP APIs for client communication.

Hands-on experience with gRPC for efficient inter-service communication.

Understanding and application of Clean Architecture principles in designing modular and maintainable systems.

Experience working in distributed microservice environments with domain-driven service decomposition.

Understanding of asynchronous messaging patterns and event-driven communication, especially over Kafka.

Good understanding of CAP theorem, message delivery strategies (at-most-once, at-least-once, exactly-once), and fault tolerance in distributed systems.

Hands-on experience deploying and managing applications in Kubernetes, using containerd or other container runtimes.

Software Design and Engineering Best Practices: Deep understanding of software design principles: SOLID, GRASP, and other key OOP/FP paradigms.

Ability to write clean, maintainable, and well-tested code.

Experience with concurrent and parallel programming, thread management, and async task orchestration Experience with high-load, low-latency systems, with the focus on reliability and latency optimisation Will be a plus:   A relevant university degree in Computer Science, Software Engineering, or a related field is preferred.

Experience with Akka, ZIO, and the Slick library Familiarity with Elasticsearch and its integration in search-heavy services.

Experience with Grafana, Prometheus (ViktoriaMetrics), ELK, or other monitoring solutions.  Familiarity with CI/CD workflows and observability tools.Familiarity with analytical databases, especially ClickHouse.

Hiring process : Intro Call with TA Specialist → Technical Interview (with Live coding session)→ Final interview → Offer Benefits: Level up daily.   Real mentorship, a clear career path, and support to lead your product.  Battle-tested tech stack.

Work with what we bet on: microservices, serverless, SRE strength.

Health comes first.

Insurance and 10 days' sick leave — because your health is a priority.

Work your way.

Remote, hybrid, Kyiv office — find your rhythm.

Time off that matters.

Build your brand.

Share your story, grow your voice — inside and out.

Culture with a pulse.

Team offsites, community events, and the energy of people who care.

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