Senior Java Developer

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.