Principal Engineer
Newcastle | Hybrid | Permanent
Salary: Up to £110,000 + Bonus & Benefits
Harrington Starr is partnering with a leading financial technology firm to hire a Principal C# Software Engineer in Newcastle.
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 £110,000 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.
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