Senior Java Developer with Oracle SQL w Kraków, Polska

We are looking for a senior Java developer to join our client's team and contribute to the development of modern, scalable back-end services. You'll be part of a collaborative team focused on clean code, agile methodologies, and delivering high-quality solutions. The client is from the investment banking industry.

Responsibilities

Design, develop, and maintain scalable back-end services and APIs using Java, Spring Boot, and Spring

Implement data access using Hibernate and SQL, with attention to performance and maintainability

Analyze and tune SQL queries and database performance on Oracle (preferred) or PostgreSQL

Define and consume RESTful APIs, clearly communicating requirements and constraints across teams

Translate business and product requirements into robust technical solutions

Apply clean code principles and back-end best practices across the codebase

Write and maintain automated tests (unit, integration)

Participate actively in agile ceremonies (Scrum/Kanban), including refinement, planning, reviews, and retrospectives

Perform code reviews and contribute to continuous improvement of engineering standards and tooling

Work closely with QA, product managers, and architects to ensure high-quality, business-aligned deliveries

Support and improve existing applications in a fast-paced, enterprise investment-banking environment

Skills

Must have

Minimum 8 years of professional experience as a Java developer, with a proven track record on long-term projects

Strong hands-on experience with Spring, Spring Boot, and Hibernate

Strong SQL skills, including query and performance tuning

Hands-on experience with Oracle (preferred) or PostgreSQL

Experience in automated testing of Java applications

Clean coding skills

Excellent problem-solving abilities

Experience in RESTful API design

Familiarity with agile development practices (Scrum, Kanban, etc.)

Good communication skills and the ability to clearly state requirements to other teams

Nice to have

Agile development methodologies

Investment banking domain knowledge as a big plus

Other

Languages

English: C1 Advanced

Seniority

Senior