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.NET Developer

Job in Worthing, West Sussex, BN91, England, UK
Listing for: Vallum Associates
Part Time, Contract position
Listed on 2026-02-28
Job specializations:
  • Software Development
    Software Engineer, Senior Developer, Full Stack Developer, C# / Unity Developer
Salary/Wage Range or Industry Benchmark: 80000 - 100000 GBP Yearly GBP 80000.00 100000.00 YEAR
Job Description & How to Apply Below
  • Initial 1 year fixed term contract
  • Hybrid - 2 days per week in the Worthing office

We’re looking for an experienced Senior .NET Developer to join our technology team and play a key role in delivering high-quality, scalable software solutions. Reporting to the Technical Delivery Manager, you’ll work across new development, system enhancements and production support, using modern Microsoft technologies and cloud platforms.

Senior .NET Developer - What you’ll be doing
  • Designing and building high-volume, high-performance, highly available applications
  • Developing, unit testing and maintaining clean, well-structured code in line with agreed standards
  • Supporting and enhancing live production systems
  • Assisting during project test phases by resolving issues related to coded components
  • Working closely with business stakeholders to translate requirements into technical solutions
  • Estimating development effort and collaborating with BAs, testers and delivery teams
  • Taking ownership of codebases, including source control and code quality
  • Producing and maintaining clear technical documentation
  • Proactively identifying and escalating technical risks or issues when needed
Senior .NET Developer - What we’re looking for
  • 8+ years’ experience in software development roles
  • Strong experience across the full software development lifecycle
  • Solid understanding of SOLID principles and unit testing
  • Extensive hands‑on experience with the Microsoft stack
    , including:
  • ASP.NET Core / MVC
  • Experience supporting and troubleshooting Azure cloud integrations
    , including:
  • Experience using Terraform to build and manage infrastructure
  • Strong experience designing and building APIs and web services
  • Comfortable working in Agile, Waterfall or hybrid environments
  • Experience in the Utilities / Energy sector is a plus
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