Senior Software Engineer

Reporting to the Engineering Lead, you will drive the design of our core lending platform. We are looking for an engineer who understands modern, high-performance Python—not just scripting. You will architect event-driven systems, handle asynchronous workflows, and mentor the team on scalability best practices.

Core:
Modern Python (3.10+), Async

IO, REST APIs.

Architecture & Scale:
Design scalable, asynchronous backend systems. You will make high-level decisions on concurrency, latency, and caching.

Technical Leadership:
Lead the team on performance tuning and reliability patterns (retries, idempotency).

Code Quality:
Enforce a high standard of testing (Unit, Integration, Contract) and modern dependency management.

Mentorship:
Mentor junior engineers through pairing and code reviews to drive technical growth within the team.

Deep Python Expertise:
You know the internals of the language, specifically memory management, packaging, and performance tuning.

Distributed Systems:
Proven experience designing systems that handle high load and asynchronous processing.

Methodology:
Extensive experience in Agile environments (SAFe experience is a strong plus).

Communication:
Our ethos is one of continuous improvement, driven by a highly collaborative environment. While there is plenty of deep work involved, this isn't a solitary role—we prioritize pairing, design discussions, and shared problem-solving over working in isolation.

* Please note, this is a Hybrid role requiring 1-2 days per week in the office in Cardiff. We are unable to offer VISA sponsorship for this role, all applicants must have full UK right to work.