Senior Java Developer

Responsibilities Design and develop Spring Boot microservices for bonus processing, game launch, and catalog management Implement promotional mechanics including bonus crediting, wagering logic, and settlement Integrate third-party game providers and wallet callbacks Build and evolve REST APIs with request signing and authentication Ensure correctness of real-money transactions using idempotency and retries Manage caching and session state with Redis Own observability using Micrometer, Prometheus, and Grafana Write unit, integration, and functional tests using JUnit 5 and Testcontainers Requirements 5+ years of backend development experience Strong proficiency in Java 17+ and Spring Boot 3.x Experience building business-critical domain logic for payments or billing Solid experience integrating and designing REST APIs Understanding of distributed systems basics (consistency, timeouts, retries) Experience with SQL and at least one NoSQL store (Redis, Cassandra, or Elasticsearch) Upper-intermediate or higher level of English Preferred Qualifications Experience with Scala, Play, or Akka Experience with Kafka and event-driven architectures Experience running services on Kubernetes and using GitLab CI Familiarity with Prometheus and Grafana iGaming or betting domain experience Benefits Annual budget for sports, medical, mental health, home office, and languages Paid maternity/paternity leave and monthly childcare allowance 20+ vacation days and unlimited sick leave Remote-first environment with coworking compensation Internal courses and growth programs About the Company GR8_TECH builds B2B iGaming platforms for operators, delivering high-impact tech designed to scale for millions of active players worldwide.