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Posted today · be early

Senior Java Developer

GR8 Tech

WorldwideremotePosted 1 day ago
GR8 Tech logo

Skill Required

Casino-CoreBackend-DevelopmentJava-DevelopmentSoftware-EngineerMicroservices-DevelopmentSenior-Java-EngineerSenior-Java-Software-EngineerSenior-Java-Developer-(Spring-Boot)Senior-Java-Full-Stack-DeveloperSenior-Full-Stack-Java-DeveloperSenior-Java-ArchitectSenior-Java-Backend-DeveloperSenior-Java-Engineer-JobsJava DeveloperJavaSystem DesignMicroservicesElasticsearchObservabilitySpring BootKubernetesPrometheusGitHub ActionsCassandradesigningsecuritybuildingdesignGitScalaKafkaRedisCloudDesign PatternsTestNGRustAPIsUnitySQLFulltime

Key highlights

  • Level Required: 5+ years of experience in back end
  • A key benefit: Benefits Cafeteria annual budget (Sports, Medical, Mental health, Home office, Languages)
  • A notable requirement: Commercial experience with strong proficiency in Java (17+) and Spring Boot 3.x
  • A notable requirement: Upper-intermediate or higher level of English

Role overview

GR8_TECH builds B2B iGaming platforms for operators who play to lead, delivering full-cycle, high-impact tech designed to scale. 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.

Responsibilities

  • 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.
  • 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.
  • Write and maintain unit, integration, and functional tests (JUnit 5, Testcontainers).
  • Ship via GitLab CI to Kubernetes; participate in code review and incident investigation.

Requirements

  • 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.

Benefits

  • Benefits Cafeteria — annual budget you allocate to: Sports, Medical, Mental health, Home office, Languages.
  • 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.

Additional details

  • 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.
  • 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.
  • Originally posted on Himalayas
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