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

Flix·Warsaw·Posted 26 October 2026

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About the role

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…

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