Full Stack Developer

Company:  Harnham
Location: London
Closing Date: 06/07/2026
Salary: £70,000 - £160,000 per annum
Hours: Full Time
Type: Permanent

Job Description

C# Full Stack Engineer (.NET)


Our client is a London‑based investment firm operating in specialist global sports markets. They build proprietary, data‑driven systems that directly support trading and research activities. The environment is highly technical, collaborative, and focused on engineering quality rather than process.


They are hiring multiple mid‑level to senior C# Full Stack Engineers to support a growing portfolio of greenfield and existing systems.


Responsibilities

  • Build and maintain C#/.NET applications across backend and full‑stack systems
  • Work on greenfield projects with ownership from early design onwards
  • Contribute to system performance, scalability, and architecture
  • Collaborate closely with engineers and researchers in a low‑bureaucracy environment


Technical Requirements and experience

  • BSc or MSc in Computer Science
  • Strong commercial experience with C# and the .NET platform
  • Experience working with relational databases (SQL Server or equivalent)
  • Solid software engineering fundamentals and attention to detail
  • Clear written and verbal communication in English


No prior experience in trading or finance is required.


Location and Working Pattern

  • Central London office
  • 5 days per week in the office initially
  • After c.4 months, flexibility to 4 days per week in the office depending on circumstances


Salary and Benefits

  • £70,000 – £160,000 base salary, depending on experience
  • Bonus - 20%
  • Pension, private health insurance, gym membership
  • Flat structure, high autonomy, strong work‑life balance


If you are interested, apply below!

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