Senior Software Engineer

Job Description

Senior Software Engineer

Hybrid

Up to £80,000 + Benefits

The Role

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.

Tech Stack

Core: Modern Python (3.10+), AsyncIO, REST APIs.

Data: SQL (PostgreSQL), NoSQL, Event-Driven Architecture.

Ops: Containerisation (Docker), CI/CD, Cloud Native.

Core Responsibilities

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.

Requirements

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.*