Senior Java Developer
Posted
Summary
Senior backend developer joining a team that builds a mission-critical billing platform handling subscription lifecycles and payment processing for clients like WSJ, BBC, and AXA. Day-to-day work is Java (with Kotlin a plus) in a hybrid monolith + microservices setup using Spring Boot, MySQL, Kafka, and Redis, with heavy focus on data integrity, testing, and reliability.
Join the team building a mission-critical billing system for global industry leaders like The Wall Street Journal, BBC, and AXA. We develop a high-scale hybrid platform (Monolith + Microservices) that manages subscription lifecycles and payment processing with zero compromise on data integrity.
What you'll do:
- Design and implement new features within a complex, high-precision billing domain.
- Solve distributed performance and reliability challenges before they hit production.
- Maintain top engineering standards through clean code, testing, and observability.
What we're looking for:
- 5+ years of backend experience with Java (up to v21); experience with Kotlin 2.0 is a strong plus.
- Solid knowledge of Spring Boot and relational databases (MySQL 8, Hibernate)—including transactions, locking, and performance tuning.
- Hands-on distributed systems expertise: Apache Kafka (event-driven architecture) and Redis / Redisson (distributed locks, eventual consistency, idempotency).
- Strong automated testing mindset with JUnit 5, Mockito, and Testcontainers.
- Polish language skills and English proficiency (B2+).
Nice to have:
- Hands-on experience with Observability (Datadog, OpenTelemetry) and Resilience4j.
- Basic AWS/Docker knowledge and experience integrating payment gateways (e.g., Stripe).
Ready to build systems that operate at a global scale?