Senior Software Engineer (AI & Data Platform)

DescriptionWe offer a B2B Contract:180 – 215 PLN net/hour + VATWe are looking for a hands-on Senior Software Engineer with experience in Python, AI and BigData to assist in design and implementation of our client's on-premise data platform with native AI agent capabilities.Your focus will be end-to-end implementation, designing components, and getting things done. This role is perfect for someone who enjoys working across backend engineering, AI integrations, and data-intensive systems.ResponsibiltiesDesign and develop backend components of the AI & Data Platform, including microservices, REST APIs, and system integrations.Implement AI/LLM features such as embeddings, RAG interfaces, vector search, and model inference workflows.Work with large-scale data systems (structured & unstructured), integrating with lakehouse, distributed storage, or streaming components.Deliver end-to-end solutions — from technical design to implementation and deployment.Collaborate with the Platform Architect and engineers across Data, ML, and Software teams to refine platform capabilities.Ensure scalability, performance, and security of the platform services.Life insuranceMultisport cardFully remote jobPrivate medical careFlexible working hoursB2B or contract of employmentAmazing integration events on a regular basisTraining budget (e.g. Microsoft Azure Certifications)Opportunity to impact our company culture build-upWork equipment (laptop, 2 monitors, and accessories)Initial interview with Julia, our recruiter - 30 minutesTechnical interview with one of our technical interviewers - 30-60 minutesInterview with the client - 1 hour