Build new back-end features, services, and APIs, and improve existing ones.
Analyse and understand functional and technical requirements, collaborating with internal and external teams as needed.
Work on statistical and analytical features end-to-end — implementation, testing, and verification that the output is correct.
Review pull requests from other engineers, including code produced with AI assistance.
Maintain applications and perform code and infrastructure upgrades.
Handle data migrations, backfilling, and large dataset operations with care.
Collaborate with frontend developers, product managers, the Tech Lead, and other stakeholders to deliver integrated solutions.
Mentor and coach other Software Engineers, helping them discover new technologies and improve their development practices.
Troubleshoot issues reported by users and provide timely resolutions.
Use AI coding tools in your daily workflow, and help the team improve how we use them.
Contribute ideas and prototypes for AI-powered product features.
Share knowledge and contribute to a positive, collaborative team culture.

Demonstrated senior-level expertise in Software Engineering with proven back-end experience.
Strong Python fundamentals — you understand the language deeply, not just one framework on top of it.
Hands-on experience with Django (our primary framework).
Strong experience with relational databases (PostgreSQL or similar), including query optimisation and migrations.
Experience designing and building REST APIs at scale.
Solid testing practice — unit and integration — with a real care for correctness on numerical and analytical code.
Comfortable with applied statistics: regression, distributions, p-values, residuals, and reference groups.
Able to reason about whether a result makes sense, not just whether the code runs.
An active, opinionated user of AI coding assistants — Claude Code, Cursor, Copilot, or similar — in your daily work.
Genuine curiosity about how AI can be embedded into user-facing products, beyond developer tooling.
Fluent in English, written and spoken; additional languages are a plus.
Strong communicator and collaborative team player.
Proactive, open-minded, and comfortable taking ownership of the projects you work on.

Senior Back End Engineer

Key skills