Senior Software Engineer (C#/.NET)

Company: ARC IT Recruitment
Apply for the Senior Software Engineer (C#/.NET)
Location: London
Job Description:

Senior Software Engineer (C#/.NET) – London /West End

We’re partnering with a phenomenally well-regarded trading and investment firm who are looking for a Senior / Lead Developer, they want someone technically sharp enough to design complex distributed systems and credible enough to lead a small team.

If you’ve been waiting for a role that rewards both sides of your skillset, this is it.

Please note role will be 4 days a week in their new West End offices.

The Role

You’ll lead a small, focused team of .net developers building systems that sit at the heart of the business – touching trading, compliance, and operations. You’ll own architecture decisions, drive delivery, and shape how the team works. Critically, you’ll stay hands‑on: this firm values engineers who can still get into the detail.

You’ll have the autonomy to do things properly – best practices in testing, CI/CD, and system design aren’t aspirational here, they’re expected.

What You Bring

  • Strong hands‑on experience in C#/.NET, with real experience leading OR mentoring engineers
  • A strong portfolio of distributed systems built for production, not just proof‑of‑concept
  • The ability to talk to a quant as comfortably as a business stakeholder
  • A desire to really excel in a thriving organisation
  • Degree in computer science or similar
  • Some familiarity with financial market data (Bloomberg, Reuters or similar) is desirable
  • A bonus if you have: exposure to the order‑to‑trade lifecycle, Bloomberg APIs, Docker or AWS. Although not essential.

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Posted: July 6th, 2026