Software Developer (.Net) - 9-Month Contract (Inside IR35) - Northampton

  • Hamilton Barnes
  • Northampton, Northamptonshire
  • 18/03/2026
Contractor Information Technology Telecommunications

Job Description

Software Developer (.Net) - 9-Month Contract (Inside IR35) - Northampton

We are seeking an experienced Software Developer with strong .Net expertise to join a specialist engineering team that support the workflows of Thermofluids Engineering and IT teams. The role focuses on building scalable applications, APIs, and data systems using the Microsoft ecosystem.

Key Responsibilities:

  • Design, develop, and test software solutions using .NET technologies.
  • Work with Thermofluids Engineering stakeholders to understand workflows and translate them into software requirements.
  • Build and maintain REST APIs and microservices using .NET frameworks.
  • Develop and maintain database-backed applications.
  • Deploy services using cloud-native infrastructure and CI/CD pipelines.

What You Will Ideally Bring:

  • Modern software development using C# and the .NET ecosystem.
  • Development of web applications and services.
  • Working with relational databases such as Microsoft SQL Server, PostgreSQL
  • Experience with data storage formats such as Parquet.
  • Knowledge of RUST is a bonus.
  • Data visualisation tools such as Plotly, Metabase, or Superset.
  • Experience integrating software with engineering tools such as MATLAB.

Contract Details:

  • Duration: 9 months (with potential extension)
  • Day Rate: up to £375 (Inside IR35)
  • Location: Northampton- Office-based with Hybrid available
  • Start Date: ASAP