Senior Full Stack Engineer – Build Internal Apps (React/TS)

Fynity is seeking a Senior Full Stack Developer based in Greater London for a 12-month fixed-term contract with potential for permanent placement. In this role, you will develop modern React-based internal applications alongside .NET backend services, aiming to replace legacy systems with scalable, API-first solutions.

The ideal candidate will have a strong understanding of modern frontend architectures and experience in retail, eCommerce, and logistics environments. You’ll collaborate closely with Product and Operations teams to solve real operational challenges through clean engineering.

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