(Senior) Python Developer - Freelance - Scheduling Platform project

Senior Python Engineer with AI Knowledge

Location: Remote/ based in European Union (Poland is client's preference)
Contract: B2B
Start date: ASAP, project at least till January 2026
Rate: 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.

Tasks & 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.