Synced from Greenhouse · Oct 26

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

FlixTrainWarsaw, PolandPosted Oct 26, 2026
Full-Stack EngineerSenior
Apply nowSave & get alerts

Mirrored from FlixTrain's own Greenhouse careers system · refreshed hourly

128
Other open FlixTrain roles
Oct 26
Posted
Greenhouse
Applicant system
Job descriptionReq 8916302002

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 professional 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

 

View original posting on Greenhouse

Land this one early - before the req fills.

LandEarly tailors your resume and screening answers to each posting, submits while the role is still new, and tracks every application in one place.

Set up in minutes · Cancel anytime · No contract

Keep exploring

What this role pays, where else it is open, and how to write the application.

Senior Fullstack Software Engineer (Python/Java) - Service Agreement
FlixTrain · Warsaw, Poland
Apply