Python Backend Engineer (LLM Data Pipelines) | US AI Product

Polcode is a Poland-based software house working with clients worldwide since 2006. They build web, mobile, and eCommerce products for startups and well-established companies across Europe, the US, and beyond. The company emphasizes a people-first approach while being deeply tech-driven. The team consists of over 100 professionals working on digital businesses, software platforms, eCommerce stores, websites, and apps.

• Commercial experience as a Backend Engineer working with Python (mid-level or higher)
• Solid backend engineering fundamentals and experience building production systems
• Experience building APIs and backend services (FastAPI or similar frameworks)
• Practical experience working with Docker and cloud-based environments
• Strong problem-solving mindset and ability to debug complex systems
• Curiosity about how LLM-based systems and data extraction pipelines work
• Willingness to work across different parts of the system - from backend development to analyzing pipeline outputs
• Strong communication skills and ability to collaborate in an international team
• English at B2+ level for daily direct communication with a US-based client
• Availability for partial time overlap with the US team (until approx. 17–18 CET)

Nice to have:

• Basic understanding of how LLMs work and how they can be used in production systems
• Experience with tools such as LangChain or similar orchestration frameworks
• Experience working with data processing pipelines or document processing systems
• Exposure to AI-powered or data-heavy products.

• Work on a backend system responsible for extracting structured data from unstructured documents
• Develop and improve a data processing pipeline powered by LLMs
• Build and maintain backend services using Python and FastAPI
• Analyze and debug outputs generated by LLM models to improve pipeline accuracy and reliability
• Experiment with prompt strategies and processing logic to achieve better extraction results
• Contribute to the evolution of an internal tool used for document data extraction
• Collaborate closely with engineers and technical stakeholders on the client side
• Write clean, maintainable, well-documented code and contribute to engineering best practices.

100% remote work within Poland only