Senior Software Engineer

This range is provided by Harrington Starr. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

London / Hybrid | Perm Role

Harrington Starr has partnered with a fast‑growing fintech that’s transforming how businesses manage foreign exchange and treasury operations. Their technology enables clients to access institutional‑grade execution, automate manual workflows, and gain greater transparency across their financial processes. Handling billions in transactions each year, they continue to expand their product offering and deliver cutting‑edge solutions that help clients manage risk more effectively.

This is an excellent opportunity for an experienced Software Engineer — ideally with a background in financial technology or FX — to join a high‑performing engineering team within a scaling fintech. You’ll be instrumental in developing and enhancing the company’s core trading and treasury systems, building new features, improving performance, and driving integration across their technology stack.

• Develop and maintain software across the full stack
• Contribute to architecture and design decisions
• Support, optimise, and maintain production code
• Research and integrate new technologies
• Foster a culture of engineering excellence and continuous improvement

• 5+ years’ experience working with C#/.NET
• Experience developing front and middle office systems
• Experience with cloud‑native solutions (Azure or AWS)
• Knowledge of event‑driven, microservices architectures
• Full SDLC experience — from design through delivery and support
• Join a fast‑scaling fintech building next‑generation financial technology
• Work on complex, high‑impact systems handling large‑scale transactions
• Collaborative, innovative, and growth‑oriented team culture
• Hybrid working model with flexibility and autonomy

Please apply via the link provided or reach out to me directly to book a confidential phone call - ol

Seniority level: Mid‑Senior level

Employment type: Full‑time

Job function: Engineering and Finance

Industries: Financial Services and Software Development