Senior Java Engineer

Are you ready to modernize critical systems and tackle performance challenges at scale?

At KUBO, we’re looking for a Senior Java Engineer to support a major architectural transformation for one of our clients in the financial sector. The project is focused on performance optimization in the ORM layer.

As a consultant, you’ll collaborate with an international, Agile team, fully remote from Poland, and help shape the future of a platform used by CFOs around the world.

Key responsibilities

• Analyze and refactor performance bottlenecks, especially in the ORM/data access layer
• Lead the design and development of scalable microservices, while carefully decomposing parts of the existing monolith
• Write clean, maintainable, and testable code with modern practices (TDD/BDD, modular design, API-first)
• Collaborate closely with other engineers, architects, and product teams to build robust solutions
• Take full ownership of the reliability and performance of your components
• Continuously improve architecture, code quality, and team processes

Ideal candidate profile

• 8+ years of experience in Java development (Java 11+), including Spring Boot & Spring Framework
• Strong experience with microservices and distributed systems
• Hands-on knowledge of ORM performance tuning (e.g. Hibernate optimization, SQL tuning)
• Solid experience with relational databases and SQL
• Familiarity with modern architectural principles: DDD, Hexagonal Architecture, Clean Code, etc.
• Experience with CI/CD pipelines and basic observability (metrics, logging, alerts)
• Engineering mindset: curious, proactive, focused on long-term quality
• Fluent Polish and English (spoken and written)

Conditions

Location: Remote from Poland

Contract type: B2B

Duration: Until end of 2026 (possible extension)

Salary: Negotiable, depending on experience

Benefits: medical care, life insurance, trainings, Multisport card

Recruitment steps

• Call with a KUBO recruiter
• Interview with the client
• Offer & onboarding