Senior Python Engineer with AI KnowledgeLocation: Remote/ based in European Union (Poland is client's preference)Contract: B2BStart date: ASAP, project at least till January 2026Rate: up to 145 PLN/h (+ VAT)Project Information (Backend Focus) Technology Stack: Python backend with PostgreSQL (or other relational databases). The environment includes testing with Pytest and deployment within Google Cloud Platform (GCP). Integration: Planned integration with an external system for exchanging sales document data (receipts, invoices) in compliance with Spanish legal requirements (Verifactu). Partner for integration currently being selected. Project Phase: Discovery phase. The team will join a new project, not an existing one. Project Goal: Build a compliant data exchange solution with an external provider according to financial department and legal regulations. Non-Functional Requirements: Compliance with financial regulations and internal security and performance standards. RequirementsTasks & Responsibilities Develop and maintain backend services in Python. Implement integrations with external data exchange providers (e.g., Verifactu). Design and maintain database schemas and queries (PostgreSQL). Ensure system compliance with financial and legal requirements. Write automated tests using Pytest. Deploy, monitor, and optimize backend services in GCP. Collaborate with frontend and cross-functional teams to ensure system integrity and reliability. Requirements Strong experience in Python development. Proficiency with PostgreSQL or similar relational databases. Experience with Pytest for backend testing. Knowledge of cloud solutions, preferably GCP. Understanding of integration with external systems (APIs, data exchange protocols). Ability to design and develop solutions compliant with financial and legal standards. Senior-level engineers preferred, with proven ability to collaborate within and across teams. Benefits100% remote, flexible work; work with an experienced team of developers and continuous development of your hard and soft skills; long-term collaboration on challenging products What will happen next? We will invite you for a meeting with our recruiter. Next, you'll participate in the client interview.