Posted 7 d ago
Senior Fullstack Software Engineer (Python/Java) - Service Agreement
Posted by Flix on 26 October 2026, 7 days ago. Still on their Greenhouse board when we checked 12 min ago. Half of Flix's roles come down within 19 days.
What the posting is about
Develop scalable agent-facing interfaces and automation for Flix's contact center applications. Collaborate with the team to design and develop user-focused solutions using modern tech stacks. Work independently as a contractor based in Poland.
Read out of the posting
Levelsenior
Experience asked5+ years
EmploymentContract
LocationWarsaw
RemoteNot stated
Visa sponsorshipNot stated
SalaryNot published, and most postings do not
Posted2026-10-26
Found viagreenhouse, direct from their system
We had it within the hour it went up.
The posting, as the company wrote it
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
Languages & Frameworks: Python, JavaScript, TypeScript, Java, flask, FastAPI, Node.js, React, Spring Boot.
Cloud Providers and IaC: AWS, Azure, Terraform, Serverless.
Data Layer: Elasticsearch, Snowflake
Streaming and Messaging Layer: Kafka.
Observability: Datadog, Kibana.
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
Copied from Flix’s own board, not rewritten.
Also open at Flix
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