Principal Software Engineer in City of London

Principal Software Engineer in City of London

City of London Full-Time 63000 - 77000 Β£ / year (est.) Home office (partial)
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At a Glance

  • Tasks: Lead the design and development of cutting-edge trading technology.
  • Company: Join a leading financial tech firm with a focus on innovation.
  • Benefits: Competitive salary, flexible working, and comprehensive health benefits.
  • Other info: Opportunity for career growth in a dynamic, hybrid work environment.
  • Why this job: Shape the future of finance with real-time technology and impactful projects.
  • Qualifications: Strong C#/.NET experience and leadership in software engineering.

The predicted salary is between 63000 - 77000 Β£ per year.

Harrington Starr is partnering with a leading financial technology firm to hire a Principal C# Software Engineer based in London.

This is a senior technical leadership role focused on real-time trading technology, platform modernisation and re-architecture, combining hands-on engineering, architecture and mentoring.

The Role:

  • Shape the technical roadmap and platform re-architecture strategy
  • Design and evolve low-latency, event-driven distributed systems
  • Lead platform development through to production and improve scalability, resilience and performance
  • Drive improvements across automation, observability, CI/CD and developer productivity
  • Partner with Engineering, Product and Operations to deliver practical technical solutions
  • Mentor engineers and champion engineering standards, best practices and continuous improvement

What We're Looking For:

  • Strong C#/.NET software engineering experience
  • Proven experience building scalable, high-performance distributed systems
  • Strong understanding of real-time and low-latency architecture
  • Experience leading modernisation, migration or re-architecture programmes
  • Experience with cloud-native architectures, APIs, event-driven systems and CI/CD
  • Financial markets experience, ideally across electronic trading, OTC derivatives, fixed income, FX or similar, with strong technical leadership skills

Benefits:

  • Up to £140,000 base salary + discretionary bonus
  • 25 days annual leave + bank holidays
  • Hybrid and flexible working
  • Private Medical Insurance and Life Insurance
  • Pension and Employee Assistance Programme

If you’re a Principal-level C# engineer looking to shape architecture, modernise complex platforms and work on real-time financial technology, we’d love to hear from you.

Principal Software Engineer in City of London employer: Harrington Starr

Join a dynamic and innovative capital markets technology business in London, where your contributions as a Junior Account Manager will directly impact client success and company growth. With a strong emphasis on employee development, a collaborative work culture, and competitive benefits, this role offers you the chance to thrive in a fast-paced environment while building meaningful relationships with clients and colleagues alike. Experience the unique advantage of working in a scaling firm backed by a leading growth investor, providing ample opportunities for professional growth and advancement.

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Contact Details:

Harrington Starr Recruitment Team

We think you need these skills to ace Principal Software Engineer in City of London

C#/.NET
Real-time Trading Technology
Low-latency Architecture
Distributed Systems
Platform Modernisation
Re-architecture
Cloud-native Architectures