Outside IR35 C# Developer Contract Jobs
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.Net Developer/Dot Net Developer; Security cleared, Azure, Rest API
Posted 2 days ago by Vesta Consulting Limited
The role of .Net Developer requires a security-cleared professional with expertise in C# and modern .NET technologies, s...
- Rate £500 per day
- Category Outside
- Work type Hybrid
- Location Taunton, Somerset, UK
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Sign UpSoftware Development Team Lead - 3 month contract - Outside IR35
Posted 3 days ago by Exalto Consulting
The Software Development Team Lead role involves providing leadership to a development team focused on Microsoft .NET an...
- Rate Negotiable
- Category Outside
- Work type Hybrid
- Location Winsford, Cheshire, UK
Full Stack Engineer
Posted 3 days ago by Leo Technology
The Full Stack Engineer role involves working with a London-based MedTech company, focusing on enhancing their Azure-bas...
- Rate £425 per day
- Category Outside
- Work type Remote
- Location London; City of London; East London; Central London; South East London; West London; Canary Wharf; South West London; North London; Greenwich; Stratford
Full Stack Engineer
Posted 3 days ago by Leo Technology
The Full Stack Engineer role involves working with a London-based MedTech company to enhance their Azure-based core plat...
- Rate £425 per day
- Category Outside
- Work type Remote
- Location London; City of London; East London; Central London; South East London; West London; Canary Wharf; South West London; North London; Greenwich; Stratford
PL/SQL Developer
Posted 4 days ago by Cadence Resourcing Limited
The PL/SQL Developer role involves joining a support team to manage and resolve incidents within a critical Agresso (Uni...
- Rate Negotiable
- Category Outside
- Work type Hybrid
- Location London; City of London; East London; Central London; South East London; West London; Canary Wharf; South West London; North London; Greenwich; Stratford
Senior C# Developer - Energy Trading organisation - London Outside IR35
Posted 4 days ago by Ink Search
The Senior C# Developer role at a leading global commodities trading organization involves designing and developing ente...
- Rate £850 per day
- Category Outside
- Work type Undetermined
- Location London, UK
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About Our Outside IR35 C# Developer Contract Roles
What does a c# developer contractor do?
Organisations bring in C# Developer contractors to build, maintain, and extend applications using the C# programming language, primarily within the Microsoft .NET ecosystem. C# is one of the most widely used languages in UK enterprise software development, making C# Developer contracts among the most frequently available in the technology contracting market. Typical engagements involve developing new applications or features using ASP.NET Core, building and consuming REST APIs, maintaining or modernising existing .NET applications, and working within larger development teams on complex software programmes. C# contractors are particularly prevalent in financial services, insurance, healthcare, and the public sector, where Microsoft technology stacks have deep roots.
The technical profile expected of C# Developer contractors centres on strong language proficiency alongside practical framework experience. ASP.NET Core, Entity Framework Core, and Web API development are the most commonly required competencies. Familiarity with Azure cloud services is increasingly expected even for primarily back-end focused roles, reflecting the widespread migration of .NET applications to the Microsoft cloud. Experience with SQL Server, unit testing with NUnit or xUnit, and working within CI/CD pipelines using Azure DevOps or GitHub Actions is broadly assumed at mid to senior levels. Contractors who combine C# expertise with front-end skills, particularly React or Angular with TypeScript, find a considerably wider range of full-stack opportunities available.
What is the market like for c# developer contractors?
Contract C# Developer work sits within among the most mature and active and high-volume segments of the UK technology contracting market. The depth of the Microsoft .NET installed base across UK enterprise ensures a continuous pipeline of development, maintenance, and modernisation work. Demand has been further supported by the migration of legacy .NET Framework applications to modern .NET versions, which requires specialist knowledge that many permanent teams lack. Rates have remained solid, with senior C# developers who combine strong language skills with Azure platform experience and knowledge of modern .NET architecture patterns commanding rates at the upper end of the developer contracting market.
What does Outside IR35 mean?
IR35 is UK tax legislation that determines whether a contractor is genuinely self-employed or working in a manner that resembles employment. When a contract is classified as outside IR35, the engagement is treated as a business-to-business arrangement. The contractor operates through their own limited company, invoices for services, and manages their own tax affairs including corporation tax, self-assessment, and VAT where applicable.
Outside IR35 engagements are assessed against three key factors: the degree of control the client exercises over how the work is delivered, whether the contractor has a genuine right to provide a substitute, and whether there is a mutuality of obligation between the parties. Contracts that demonstrate contractor autonomy, project-based delivery, and the absence of ongoing employment obligations are more likely to sit outside IR35. Since April 2021, responsibility for making this determination sits with the end client for medium and large private sector organisations.
On QualityContracts.co.uk, approximately 28% of roles with a stated IR35 status are classified as outside IR35. The proportion varies by sector and role type, with some disciplines seeing a significantly higher or lower share of outside IR35 opportunities. Each listing on this page displays its IR35 status where provided by the hiring organisation.
What c# developer roles are usually Outside IR35?
C# development shares much of the same IR35 profile as broader .NET work. Outside IR35 opportunities tend to involve specific application builds, API development projects, or system integrations scoped as defined deliverables. The C# contractor market overlaps heavily with the .NET market, and many roles are listed interchangeably. ISVs building commercial software products and consultancies delivering bespoke solutions for their clients are the most active sources of outside IR35 C# work.
How much do c# developer contractors usually earn when working Outside IR35?
Contract rates for c# developer roles typically range from £500 to £850 per day, depending on the scope of the role, required expertise, and the delivery expectations of the engagement. Rates shown are for outside IR35 engagements and reflect the gross day rate paid to the contractor's limited company before any personal tax obligations.
How many Outside IR35 c# developer vacancies are there on Quality Contracts?
Over the past twelve months, we have tracked over 200 c# developer contract roles across the site. Of the roles currently listed on our site, around one in four are Outside IR35. Data reviewed up to June 2026.