Mostyn Chase
Principal Engineer
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Principal Engineer | Bracknell (Hybrid 2-3 days in office)
Vue or React on the frontend, C# /.NET on the backend, AWS in production, and agentic coding tools as part of how you build every day. If that is your stack, and you have anchored complex cross-team problems as a hands-on individual contributor in payments, FX, or another regulated environment, this could be a strong fit.
We are supporting a payments platform company that is rebuilding its core.
The Role
You will take the hardest problems on the rebuild, decide how they get solved, and stay in the code while you do it. You will keep the standards straight across squads, pick up the parts of the migration off the legacy services that need real judgment, and lift the engineers around you through design review and mentoring. No direct reports. Your influence comes from the quality of your technical calls, not a reporting line.
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What We Are Looking For
- Proven experience building production software end to end across the full stack.
- Strong frontend work with Vue.js, React, or equivalent, plus solid fundamentals in responsive design, accessibility, performance, and internationalisation.
- Strong backend in C# / .NET
- Deep system design experience: microservices, event-driven patterns, solid SQL, and relational data
- Production AWS: SQS, DynamoDB, S3, ECS, Lambda, CI/CD, and modern deployment
- A track record leading cross-team technical work as an individual contributor.
- Daily use of agentic coding tools, with a clear view on how a team should adopt AI.
- Payments, FX, or regulated industry experience
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Desirable
- Leading platform modernisation or large migrations
- Setting engineering standards or technical strategy adopted across teams
- Caching with Memcached or Redis
- Jira and Confluence
If you want principal-level scope, real autonomy, and problems that move money at scale, with the freedom to stay deep in the code, this is for you.
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