Flix

Senior Fullstack Software Engineer (Python/Java) - Service Agreement

Warsaw · Berlin, Berlin, Germany

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hirly's read of this role

Role family: Engineering
Seniority: Senior
Countries: PL, DE
Work mode: On-site / unstated
First seen by hirly: 27 Oct 2026

Derived automatically from the posting. Upload your resume above to see how the role scores against it.

the posting

Rate: 135 – 170 PLN/hour (B2B)

We are looking for an experienced Software Engineer to join Flix on a freelance/service agreement basis (B2B contract). This is a contractor engagement for a seasoned professiona l with a full - stack mindset.

Scope of Services

Developing Flix’s contact center applications, with a focus on scalable agent-facing interfaces and automation . The role will involve extensive discovery to identify the most efficient and effective workflows.

Our tech stack

About the Engagement

Deliver solutions for a defined portfolio of products, contributing to business objectives.

Design and develop user-focused solutions tailored to product requirements and user needs.

Apply Agile methodologies to organize and execute the development process.

Develop and enhance products using modern technology stacks.

Make technical decisions within the scope of services provided, promoting technical excellence and consistency across solutions.

About You

Minimum 5 years of professional experience in full-stack development, with a focus on architecture, system design, and legacy product migration.

Extensive experience with Python and its ecosystem for the development of new products.

Solid knowledge of Java for the maintenance and further development of existing products.

Strong focus on quality assurance practices and technical standards throughout the product development lifecycle.

Hands-on with automated testing and experience with different test runners.

Comfortable with Agile methodologies in planning and executing development work.

Cooperation model

Cooperation based on a service agreement (B2B/freelance contract), not an employment contract.

You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices

Location : open for contractors based in Poland

Original posting on Flix's site ↗

Listed on hirly, a job board. hirly is not the employer: Flix is hiring for this role.

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