Java Developer - Freelancer

Senior Java Developer

SKILLS: Java | syntax C++ | PostgreSQL | Git

B2B: PLN 125 - 175 / Hour 💰

LOCATION: REMOTE (POLAND)

START DATE: 03.11.2025

END DATE: 28.02.2026

Key Duties and Requirements: A Roadmap to Your Professional Success 🚀

Scope of responsibilities:

• Rewrite existing system components from C++ to Java (primarily backend).

• Understand and analyze existing C++ codebase to ensure accurate migration.

• Maintain high code quality and compliance with the established architecture.

• Collaborate closely with developers, analysts, testers, and the solution architect.

• Participate in daily stand-ups, code reviews, and other team ceremonies.

• Propose improvements to implementation and architecture when necessary.

Here’s a set of skills we require:

• 3+ years of professional experience in Java development.

• Strong knowledge of Java 8+ and the Spring ecosystem (Spring Boot, Spring Data, etc.).

• Experience working with complex monolithic or distributed systems.

• Ability to read and analyze existing code in other technologies (e.g. C++, Delphi, .NET).

• Solid understanding of relational databases (PostgreSQL, Oracle, MySQL, etc.).

• Proficiency with Git and build tools (Maven or Gradle).

• Commitment to clean code principles, refactoring, and code quality.

• Good communication and teamwork skills.

• Polish language - minimum C1 level

Nice to have:

• Experience with legacy system migrations.

• Knowledge of design patterns and microservice architecture.

• Familiarity with testing and monitoring tools (e.g. JUnit, Mockito, Prometheus).