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

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 • 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