Senior Java Developer

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.