Principal Engineer

Harrington Starr; Newcastle upon Tyne; Hybrid; GBP 99,000 - 121,000; Full time

Benefits offered by this job

Private Medical Insurance

Life Insurance

Pension

Employee Assistance Programme

Hybrid and flexible working

Job summary

Harrington Starr partnered with a leading fintech to hire a Principal C# Software Engineer in Newcastle. The role combines hands-on engineering, architecture and mentoring to drive real-time trading platform modernization and re-architecture.

You will shape technical roadmaps, lead platform development to production, improve scalability and performance, and mentor engineers while championing best practices in CI/CD, observability, and cross-team collaboration. Hybrid work available.

Qualifications

• Strong C#/.NET software engineering experience.
• Strong understanding of real-time and low-latency architecture.
• Experience leading modernization, migration or re-architecture programmes.
• Experience with cloud-native architectures, APIs, event-driven systems and CI/CD.

Responsibilities

• Shape the technical roadmap and platform re-architecture strategy.
• 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.

Skills

C#/.NET

Real-time latency

Technical leadership

CI/CD

Cloud-native

Platform modernization

Finance domain

Mentoring

Job description

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
• 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
• 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
• 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.