Full Stack Developer (React & C#) - Banking at Platinum Group, London, 12 Months, to £800 per day

Upto £800 Per Day Inside IR35 - 12 month engagement.

Platinum group are seeking a highly skilled Full Stack Developer with strong expertise in C# (.NET) and React to join their project onsite at a top-tier European investment bank.

You will work on mission-critical systems used in FX trading, contributing to the development and enhancement of a high-performance, low-latency trading platform.

This is a Front Office aligned engineering role where you will partner closely with traders, quants, and other technologists to evolve the bank's global FX trading capability.

Key Responsibilities

• Develop and maintain scalable, high-performance applications for FX trading desks

• Build responsive, Real Time web front ends using React integrated with .NET services

• Implement Server Side components and APIs in C# (.NET Core/.NET 6+)

• Work on pricing, analytics, trade capture, risk management, and PnL components

• Collaborate with trading, quant, and DevOps teams to deliver high-quality solutions

• Optimize application performance in latency-sensitive environments

• Participate in design reviews, code reviews, and test automation

Required Skills and Experience

• Strong C#/.NET development experience in enterprise trading environments

• Hands-on expertise with React, TypeScript, and modern Front End practices

• Solid understanding of object-oriented design, microservices architecture, and APIs

• Experience with FX options or other derivatives trading systems (highly desirable)

• Familiarity with Multithreading, asynchronous programming, and memory optimization

• Working knowledge of SQL and NoSQL databases

• Experience with Real Time systems, streaming, or WebSockets (a plus)

• Exposure to Azure, Docker/Kubernetes, or other cloud technologies is advantageous

Nice to Have

• Experience working directly with traders or Front Office users

• Background in quantitative finance, or understanding of option pricing models

• Familiarity with DevOps tooling, CI/CD pipelines, and automated testing frameworks