Senior Python Developer

About the role

City Science is seeking a Senior Python Developer to join its five‑person energy development team. You will help design and implement Python packages that extend the Home Energy Model, enabling next‑generation energy performance assessment and contributing directly to carbon reduction.

Key responsibilities

• Design, build and improve Python packages for modelling, simulation and data processing.
• Lead engineering decisions, architecture discussions and technical problem solving.
• Turn analytical and modelling needs into shippable software.
• Line‑manage developers, conduct one‑to‑ones, set objectives and review performance.
• Mentor colleagues through code reviews, pairing and knowledge sharing.
• Maintain high code quality with testing, documentation and thorough reviews.
• Collaborate across disciplines to integrate tools and deliver results for customers.
• Drive continuous improvement of tools, processes and engineering standards.

Required profile

• Strong professional experience as a Python developer at or near senior level.
• Proven ability to write clean, maintainable, well‑tested production‑grade code.
• Experience line‑managing or mentoring developers, or clear motivation to take on management responsibilities.
• Excellent problem‑solving skills and ability to communicate technical ideas to both technical and non‑technical audiences.
• Experience working in multidisciplinary teams.

Required skills

• Python and its ecosystem (libraries, tooling, best practices).
• Pydantic and/or JSON Schema.
• GitLab CI/CD.

What we offer

• Fully remote working with optional access to offices in Birmingham, Bristol, Exeter and London.
• Flexible working hours to support work‑life balance.
• Talented, supportive team of engineers, data scientists and domain experts.
• Impactful projects in decarbonisation and sustainability.
• Opportunities to grow as a people leader and shape new products.
• 25 days annual leave plus bank holidays, buy/sell leave policy.
• Group pension scheme, enhanced maternity/paternity, eye‑care, cycle‑to‑work and employee assistance programmes.