Senior Java Back-End Developer

Worldline Show all offers

Hybrid

Senior

Warszawa

1 day ago

In short

Senior Java Back-End Developer needed in Warsaw for Worldline. Responsibilities include feature delivery, architecture, API design, database management, CI/CD, and incident resolution. Requires 4+ years of Java, Spring Boot, SQL, Docker, and CI/CD experience. Offers private medical & life insurance, MyBenefit Platform, holiday, public transport, meal allowances, and annual bonus.

Keywords

java spring boot sql docker ci/cd restful api git postgresql

AI-written summary based on the listing content.

Technologies we use

Your responsibilities

Work closely with a cross functional team on the delivery of new features and services; setting the standard and technical direction for Risk tech service.
Own architecture and design decisions: service boundaries, APIs, cross-service contracts, and data models - balancing simplicity, reliability, security, and maintainability.
Design database schemas and manage evolution through versioned migrations.
Design and build RESTful APIs and asynchronous/event-driven integrations between services.
Apply resilience patterns (retries, idempotency, circuit breakers) and champion test-driven development with strong coverage.
Own delivery: contribute to CI/CD pipelines, containerization, cloud infrastructure, and observability.
Diagnose complex issues across services and infrastructure; lead incident investigation and resolution.
Run and participate in code reviews; mentor mid-level and junior developers.
Establish and uphold coding standards, security practices, and design principles across the team.

Our requirements

4+ years of professional Java development experience
Experience with modern Java (latest LTS) and a mindset of keeping up with the newest stable language features and tooling.
Proficiency in Java and object-oriented (and ideally functional) programming principles.
Strong experience with Spring Boot and the Spring ecosystem, including Spring Security / OAuth2.
Solid SQL and relational database experience (e.g. PostgreSQL), including schema design and query optimization.
Experience with a schema migration / database versioning tool (e.g. Flyway, Liquibase).
Proven experience designing and building RESTful APIs and integrating distributed services.
Experience with containers (e.g. Docker) and CI/CD pipelines (e.g. Jenkins, GitLab CI)
Strong experience with automated testing - unit and integration (e.g. JUnit, Testcontainers).
Solid grasp of software architecture and design patterns (e.g. clean/hexagonal architecture, DDD).
Solid Understanding of secure coding, resilience, and observability in production systems.
Confident use of Git and modern branching/merging workflows.