Job VC
Senior Java Developer Warsaw
Technologies
Description
Location: Warsaw!
Start: as soon as possible
Duration: long-term
Languages: Polish is mandatory !! English: B2
Project domain: telecommunication
Hybrid: 1-2x week in Warsaw | 5+ years Java exp | English B2+
Backend Core: Expert-level Java 21+ (Virtual Threads, Records) and Spring Boot 3.x production proficiency.
Reactive & Security: Spring WebFlux/WebClient for non-blocking I/O; Spring Security with OAuth2/JWT validation.
Event-Driven Architecture: Designing high-scale ecosystems with eventual consistency, idempotency, and process orchestration.
Migration Leadership: Leading domain-specific transitions from Java to Node.js/TypeScript (Key Differentiator).
API Design: Contract-first development with OpenAPI 3.x and automated client generation.
Database & State: Spring Data MongoDB (document modeling) and distributed state handling with Redis/Caffeine.
Observability: Micrometer, Prometheus, and OpenTelemetry for distributed tracing and post-mortem analysis.
Resilience: Advanced Resilience4j implementation (retries, backoffs, rate limiting, and graceful degradation).
Testing & Tooling: Spock/Groovy (BDD), WireMock, and Maven multi-module management.
Start: as soon as possible
Duration: long-term
Languages: Polish is mandatory !! English: B2
Project domain: telecommunication
Hybrid: 1-2x week in Warsaw | 5+ years Java exp | English B2+
Backend Core: Expert-level Java 21+ (Virtual Threads, Records) and Spring Boot 3.x production proficiency.
Reactive & Security: Spring WebFlux/WebClient for non-blocking I/O; Spring Security with OAuth2/JWT validation.
Event-Driven Architecture: Designing high-scale ecosystems with eventual consistency, idempotency, and process orchestration.
Migration Leadership: Leading domain-specific transitions from Java to Node.js/TypeScript (Key Differentiator).
API Design: Contract-first development with OpenAPI 3.x and automated client generation.
Database & State: Spring Data MongoDB (document modeling) and distributed state handling with Redis/Caffeine.
Observability: Micrometer, Prometheus, and OpenTelemetry for distributed tracing and post-mortem analysis.
Resilience: Advanced Resilience4j implementation (retries, backoffs, rate limiting, and graceful degradation).
Testing & Tooling: Spock/Groovy (BDD), WireMock, and Maven multi-module management.