Mid-Level Developer

Oscar; Leeds; On-site; GBP 35,000 - 63,000; Full time

Job summary

Oscar is offering a Mid-Level .NET Developer role in the UK, with a focus on C#, .NET Framework, Blazor, and SQL Server. You will join a small IT team, take ownership of development tasks, and help modernise and integrate key business systems across a varied tech landscape.

The role emphasizes contributing to architecture, improving integrations, and expanding technical skills within a growing IT function. Salary ranges align with market levels for a mid-level developer.

Qualifications

• Strong commercial experience with C# and .NET Framework.
• Experience with WinForms, including maintaining and enhancing legacy applications.
• Experience with Blazor.
• Strong SQL Server experience, including database design and optimisation.
• Experience with system integration and managing data across multiple platforms.
• Understanding of software development principles, testing and version control.
• Experience with legacy technologies such as VB.NET or Delphi would be beneficial.
• Desirable: experience modernising legacy applications and moving towards more maintainable architectures.
• Desirable: experience with ASP.NET Core or other modern .NET technologies.
• Desirable: experience with DevExpress or similar third-party development components.
• Desirable: experience with VBA.
• Desirable: experience with ERP systems.
• Desirable: experience within manufacturing, logistics or another operational environment.
• Desirable: experience integrating multiple business systems and managing data flows.

Responsibilities

• Join a small, collaborative IT team as a Mid-Level Developer.
• Take ownership of development work.
• Contribute to key business systems.
• Help modernise existing technology.
• Work across a varied technical environment.
• Develop and maintain applications.
• Improve systems, integrations and overall architecture.
• Broaden technical skills and have a genuine impact on the organisations technology roadmap.

Skills

C#

.NET Framework

WinForms

Blazor

SQL Server

System integration

VB.NET

Delphi

ASP.NET

DevExpress

ERP

Tools

DevExpress

Job description

Salary: £34,500 - 62,500 per year

Requirements:

• Strong commercial experience with C# and .NET Framework
• Experience with WinForms, including maintaining and enhancing legacy applications
• Experience with Blazor
• Strong SQL Server experience, including database design and optimisation
• Experience with system integration and managing data across multiple platforms
• Understanding of software development principles, testing and version control
• Experience with legacy technologies such as VB.NET or Delphi would be beneficial
• Desirable: experience modernising legacy applications and moving towards more maintainable architectures
• Desirable: experience with ASP.NET Core or other modern .NET technologies
• Desirable: experience with DevExpress or similar third-party development components
• Desirable: experience with VBA
• Desirable: experience with ERP systems
• Desirable: experience within manufacturing, logistics or another operational environment
• Desirable: experience integrating multiple business systems and managing data flows

Responsibilities:

• Join a small, collaborative IT team as a Mid-Level Developer
• Take ownership of development work
• Contribute to key business systems
• Help modernise existing technology
• Work across a varied technical environment
• Develop and maintain applications
• Improve systems, integrations and overall architecture
• Broaden technical skills and have a genuine impact on the organisations technology roadmap

Technologies:

• .NET Framework
• ASP.NET
• Blazor
• C#
• Delphi
• DevExpress
• ERP
• SQL
• VBA

More:

We are working with an established organisation offering a Mid-Level Developer opportunity in Castleford with 3 days on-site and a salary of 40,000 to 50,000 DOE. This is a strong opportunity for a Mid-Level .NET Developer who wants a varied role, genuine ownership and the chance to work across both established and modern technologies within a growing IT function. We are a small, collaborative team and the role offers the opportunity to contribute to key business systems and help shape our technology roadmap.

last updated 36 week of 2026