Senior Python Developer

Join to apply for the Senior Python Developer role at City Science

Salary:
From £50,000 per annum DOE

Location:

Remote with flexible working arrangements. All UK based locations considered. Flexible office collaboration spaces available in Birmingham, Bristol, Exeter and London.

Term/

Hours:

Permanent. 32‑40 hours per week, with flexibility over working pattern – please state in your application.

Closing Date for applications:
Monday 5th January 2026

We are looking for an experienced Senior Python Developer to take a leading role in designing, implementing, and maintaining high‑quality Python‑based software. You’ll collaborate closely with data scientists, engineers, and domain experts to turn complex analytical requirements into reliable, maintainable software within a supportive, high‑performing team.

• Design, build, and improve Python applications that support modelling, simulation, optimisation, and data processing.
• Lead on engineering decisions, architecture discussions, and technical problem solving.
• Translate analytical or modelling needs into efficient production‑ready software.
• Ensure high code quality through testing, documentation, and code reviews.
• Work collaboratively across disciplines to integrate tools and deliver results.
• Contribute to continuous improvement of tools, processes, and engineering standards.
• Take ownership of deliverables and help drive project success with urgency and accountability.

City Science is an SME founded in 2015 with a core mission of delivering decarbonisation. We help organisations who are committed to decarbonisation achieve meaningful and quantifiable carbon reductions quickly and efficiently.

• Strong professional experience as a Python developer, operating at or near a senior level.
• Excellent proficiency in Python and its ecosystem (libraries, tooling, best practices).
• Experience building production‑grade applications, ideally within data‑rich or scientific domains.
• Ability to write clean, maintainable, well‑tested code.
• Strong problem‑solving skills and the ability to communicate technical concepts clearly.
• Experience working collaboratively in multidisciplinary teams.

• Experience with geospatial tools (e.g., Geo Pandas, Shapely).
• Familiarity with scientific computing, simulation, or optimisation libraries.
• Cloud experience (AWS, Azure, GCP).
• Understanding of decarbonisation, energy systems, or transport modelling.

• Excellence:
  Commitment to high standards in your code, solutions, and engineering decisions.
• Ownership & Accountability:
  You take responsibility for outcomes and proactively drive progress.
• Data‑Driven:
  You use evidence, analytical thinking, and testing to guide choices.
• Results Oriented:
  You focus on delivering meaningful outputs that create real‑world impact.
• Adaptability & Learning:
  You embrace change, seek out new knowledge, and learn quickly.
• Passion & Urgency:
  You care about what you build and work with purpose to achieve it.
• Meritocracy:
  You value competence, fairness, and helping raise the bar across the team.
• Entrepreneurial:
  You’re resourceful, creative, and eager to contribute ideas that move the business forward.

• Fully remote working, supported by optional access to co‑working hubs across the UK.
• Flexible working hours to support work‑life balance.
• Opportunity to join a talented, friendly, and supportive team of engineers, data scientists, and domain experts.
• Work on impactful projects in the decarbonisation and sustainability space.
• Real opportunities to grow, learn, and shape the direction of exciting new products and capabilities.
• 25 days annual leave entitlement, plus bank holidays.
• Membership of our group pension scheme.
• Enhanced maternity and paternity policy.
• Eye care policy.
• Cycle to work scheme.
• Employee assistance program.

• Your resume highlighting relevant backend and testing experience.
• Examples of projects demonstrating your technical skills.
• Links to relevant code repositories or portfolio work.

Good luck!