Senior Java Developer

Job description

**GR8_TECH builds B2B iGaming platforms for operators who play to lead.** We deliver full-cycle, high-impact tech designed to scale — from seamless integrations and expert consulting to long-term operational support. Our platform powers millions of active players and drives real business growth. Call it what it is: the iGaming Platform for Champions. With 1000+ GR8 people across locations and time zones, we don’t just ship technology — we help operators build success stories across brands, markets, and geos. **Our ambition drives us. Our people make it real.** If you’re a challenger in spirit and a champion in action — join us. ## Why this role exists: This role exists to design, build, and maintain backend services across the Casino platform — bonus and promotional mechanics, wallet and transaction flows, game launch and catalog, and game provider integrations — ensuring reliability, correctness, and performance under high load. ## What you’ll drive: **Casino platform services** - Design and develop Spring Boot microservices across the casino domain: bonus processing, game launch, lobby and game catalog management. - Implement and evolve promotional mechanics end-to-end — from bonus crediting and wagering logic to expiry and settlement — with correctness guarantees on real money. - Integrate third-party game providers, game launch, wallet callbacks (bet/win/refund), provider-side bonus features. - Build and evolve REST APIs consumed by internal services and external providers, including request signing, authentication, and API versioning. **Reliability & correctness** - Ensure correctness of real-money transaction and bonus flows — idempotency, retries, timeouts, graceful degradation of downstream calls. - Work with Redis for caching and session state; tune service performance under production load. - Own observability: metrics (Micrometer/Prometheus, Grafana dashboards), structured logging, alerting. **Quality & delivery** - Write and maintain unit, integration, and functional tests (JUnit 5, Testcontainers). - Ship via GitLab CI to Kubernetes; participate in code review and incident investigation. ## What makes you a GR8 fit: **Must-have** - 5+ years of experience in back end. - Commercial experience with strong proficiency in Java (17+) and Spring Boot 3.x (Web, Security, Data, Actuator). - Experience building business-critical domain logic (payments, bonuses, billing, or similar money-adjacent flows). - Solid experience integrating third-party REST APIs and designing your own. - Understanding of distributed systems basics: idempotency, consistency, timeouts, retries, caching. - Experience with SQL and at least one NoSQL store (Redis, Cassandra, or Elasticsearch). - Upper-intermediate or higher level of English. **Nice-to-have** - Scala experience (parts of our wallet platform run on Scala / Play / Akka). - Experience with Kafka and event-driven architectures (some of our services use Spring Cloud *Stream*). - Experience running services on Kubernetes; familiarity with GitLab CI. - Familiarity with Prometheus and Grafana. - iGaming / betting domain experience. ## **Why you’ll love working here:** **Benefits Cafeteria** — annual budget you allocate to: Sports • Medical • Mental health • Home office • Languages. **Work-life & support** - Paid maternity/paternity leave + monthly childcare allowance. - 20+ vacation days, unlimited sick leave, emergency time off. - Remote-first + tech support + coworking compensation. - Team events (online/offline/offsite). - Learning culture with internal courses + growth programs. ## **Our culture & core values:** GR8_TECH culture is how we win — through trust, ownership, and a growth mindset. We move fast, stay curious, and keep it real, with open feedback, room to experiment, and a team that’s got your back. **FUELLED BY TRUST**: we’re open, honest, and have each other’s backs. **OWN YOUR GAME**: we take initiative and own what we do. **ACCELER8**: we move fast, focus smart, and keep it simple. **CHALLENGE ACCEPTED**: we grow through challenges and stay curious. **BULLETPROOF**: we’re resilient, ready, and always have a plan.