Java Developer - Freelancer

We are a technology company that started its journey in 2008. Our main headquarters is located in the picturesque city of Poznań, nestled by the beautiful Malta lake. For more than 17 years, we have been assisting companies in developing and implementing innovative fintech solutions. Leveraging our expertise in areas such as blockchain, online payments, and more, our clients can invent and develop cutting-edge solutions and services that keep them at the forefront of innovation.

Requirements

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).