Backend Developer (Python) – Semi-Senior

About the role

We are looking for a Backend Engineer to join a US‑based tech energy company. You will own and evolve the backend that powers analytical and optimization models used by real customers.

Key responsibilities

• Maintain, debug, and extend an existing Python codebase built around analytical and optimization models.
• Build and maintain REST APIs (FastAPI/Flask) that expose model results to internal and external users.
• Work with data pipelines using pandas to transform, validate, and optimise data flows.
• Investigate and resolve customer‑reported issues from the support portal.
• Improve code quality through testing, CI/CD, and documentation.

Required profile

• 2–4 years of professional experience as a backend or Python engineer.
• Strong Python skills and solid hands‑on experience with pandas.
• Comfortable reading and maintaining existing analytical or optimisation code.
• Professional English (B2 or higher) to work directly with US stakeholders.

Required skills

• Python
• pandas
• FastAPI or Flask
• PostgreSQL / SQL Server
• Pytest
• Git
• Docker
• GitHub Actions (CI/CD)

What we offer

• Real ownership of a core product with direct customer impact.
• Work with a US team on meaningful technical challenges.
• Growth path toward a lead role.