Senior Java Developer

Senior Java Developer

Rate: Up to 150 PLN/h net + VAT (B2B)

Location: Warsaw, Gdańsk, or Gdynia

Work Model: Hybrid (3 days a week from the office / 50% remote)

We are Optiveum , a specialized recruitment and contracting company. We are currently looking for a Senior Java Developer to join the team of our client, a prominent international company operating in the financial and investment sector.

In this model, you will sign a B2B cooperation agreement directly with Optiveum.

As a Senior Java Developer, you will be responsible for developing and enhancing our client's Java-based applications that handle taxation, account management, and investment processing for pension and savings products.

Key Responsibilities

• Designing, developing, and maintaining Java applications supporting savings and investment products.


• Building robust calculation engines that ensure compliance with current tax regulations across multiple countries.


• Developing support for complex business processes, integrating with tax authorities, and generating customer-facing reports.


• Participating in the full software development lifecycle, including requirements analysis, design, coding, testing, and deployment.


• Collaborating with financial analysts to translate business requirements into technical solutions.


• Mentoring other developers, acting as a code reviewer or design sparring partner, and spreading practical engineering practices across the team.


• Responsibly utilizing AI-assisted development and automation tools to improve productivity, quality, and continuous learning.

Must-Have Requirements

• Strong proficiency in Java (especially Java 21 ) and related frameworks (Spring, Spring Boot, Hibernate ).


• Experience with relational databases and SQL (e.g., PostgreSQL ).


• Knowledge of messaging protocols such as JMS , MQ , etc.


• Knowledge of OpenAPI and AsyncAPI for producing and consuming data.


• Familiarity with version control systems (Git ) and CI/CD pipelines.


• Solid understanding of software design patterns and Object-Oriented Programming (OOP) principles.


• Advanced English proficiency, allowing for smooth communication in an international environment.

What Optiveum Offers

• A transparent B2B contract signed directly with Optiveum as your contracting party.


• Attractive hourly rate up to 150 PLN/h net + VAT .


• Ongoing operational support from Optiveum throughout the entire duration of our cooperation.


• The opportunity to work in a collaborative, international environment strongly influenced by a supportive Swedish organizational culture.


• A flexible hybrid working model.