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Full Stack Tech Lead - C# / .NET

London

Posted 2 hours ago

Work Type

Contract

Salary/Rate

£ 600-700 per day

Remote Work

No

IR35 Status

Inside IR35

Job Title: Full Stack Developer
Location: London
Salary/Rate: £650-£700 a day
Start Date: April
Job Type: Contract - 12 months

Tech Stack: C# / .NET, React / Next.js, Google Cloud Platform

We are an established technology company building a large-scale platform integrating financial, risk, and payment services, with a focus on delivering robust, scalable solutions for a sustainable future. Our culture is built on technical excellence, collaboration, and continuous improvement.

We are looking for a highly experienced Full Stack Tech Lead to drive the architecture and development of our platform built with C#/.NET, Next.js, and Google Cloud Platform (GCP).

This is a hands-on leadership role (60-75% coding) where you will shape technical direction, mentor developers, and work closely with senior leadership to deliver scalable and maintainable systems.

Key Responsibilities

  • Lead architecture and development of C#/.NET backend services and APIs

  • Build and optimise Next.js/React applications

  • Oversee integrations with financial, risk, and payment APIs

  • Guide cloud architecture, deployment, and scaling on GCP

  • Mentor developers and conduct code reviews

  • Work with Product Owners on technical planning and delivery in Agile

Requirements

  • 7 years software development experience with leadership responsibilities

  • Expert in C#/.NET and Next.js/React

  • Experience building large-scale platforms

  • Strong experience with external API integrations (financial/payment systems)

  • Deep knowledge of Google Cloud Platform (GCP)

Nice to Have

  • Experience with Infrastructure as Code (IaC)

  • Experience with large-scale data processing or streaming on GCP

If you're a hands-on technical leader who enjoys building scalable systems and mentoring teams, we'd love to hear from you.

Disclaimer
Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.
Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.

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