.NET Developer

Tech4 Ltd; Southampton; On-site; GBP 55,000 - 60,000; Full time

Benefits offered by this job

Training & career development

Hybrid work arrangement (2 days in the

Southampton office

Job summary

Tech4 Ltd in United Kingdom is seeking a hands-on Software Developer to design, build, test and support .NET-based applications, APIs and system integrations. The role focuses on delivering reliable, scalable software across a mixed legacy and modern estate and involves collaboration with stakeholders and a delivery-focused team.

The position is based in Southampton with a hybrid work model: two days in the office and three days remote.

Qualifications

• Commercial experience developing software using C# and .NET.
• Experience building or supporting APIs, web services and system integrations.
• Experience with ASP.NET or ASP.NET Core.
• Experience with SQL Server and database design and querying.
• Experience using Git for source control.
• Experience using Azure DevOps or similar tooling for work tracking, build and deployment.
• Experience working within a software development team in a structured commercial environment.
• Experience troubleshooting and supporting live applications.
• Strong problem-solving skills and the ability to work through technical issues in a practical way.
• Good communication skills and the ability to work with both technical and non-technical colleagues.

Responsibilities

• Develop, enhance, test and support .NET-based applications, APIs and integrations.
• Work on customer-facing, operational and internal systems to improve reliability, usability and business value.
• Collaborate with business stakeholders, product owners, analysts and third parties to understand requirements and translate them into workable technical solutions.
• Build and maintain system integrations between internal platforms and external suppliers or services.
• Support the ongoing improvement and maintenance of existing applications, including troubleshooting defects, performance issues and production incidents.
• Contribute to technical design decisions, ensuring solutions are secure, supportable and aligned to good engineering practice.
• Write clean, maintainable code and follow agreed standards for version control, testing, deployment and documentation.
• Participate in code reviews, peer support and knowledge sharing within the team.
• Assist with release activity, deployment processes and post-release support where required.
• Help improve development practices, documentation and technical resilience to reduce dependency on individual team members.
• Work with Azure DevOps, Git and CI/CD tooling to support structured software delivery.
• Contribute to a collaborative, delivery-focused team culture and support continuous improvement in the way we develop and support software.
• Perform other ad-hoc duties assigned by the Head of IT from time to time.
• Accept responsibility for personal development within the scope of the role and encourage the development of others.

Skills

C# proficiency

API development

Team collaboration

Problem solving

Communication

Tools

Git

Azure DevOps

ASP.NET

SQL

Job description

Salary: £55,000 - 60,000 per year

Requirements

• Commercial experience developing software using C# and .NET
• Experience building or supporting APIs, web services and system integrations
• Experience with ASP.NET or ASP.NET Core
• Experience with SQL Server and database design and querying
• Experience using Git for source control
• Experience using Azure DevOps or similar tooling for work tracking, build and deployment
• Experience working within a software development team in a structured commercial environment
• Experience troubleshooting and supporting live applications
• Strong problem-solving skills and the ability to work through technical issues in a practical way
• Good communication skills and the ability to work with both technical and non-technical colleagues

Responsibilities

• Develop, enhance, test and support .NET-based applications, APIs and integrations
• Work on customer-facing, operational and internal systems to improve reliability, usability and business value
• Collaborate with business stakeholders, product owners, analysts and third parties to understand requirements and translate them into workable technical solutions
• Build and maintain system integrations between internal platforms and external suppliers or services
• Support the ongoing improvement and maintenance of existing applications, including troubleshooting defects, performance issues and production incidents
• Contribute to technical design decisions, ensuring solutions are secure, supportable and aligned to good engineering practice
• Write clean, maintainable code and follow agreed standards for version control, testing, deployment and documentation
• Participate in code reviews, peer support and knowledge sharing within the team
• Assist with release activity, deployment processes and post-release support where required
• Help improve development practices, documentation and technical resilience to reduce dependency on individual team members
• Work with Azure DevOps, Git and CI/CD tooling to support structured software delivery
• Contribute to a collaborative, delivery-focused team culture and support continuous improvement in the way we develop and support software
• Perform other ad-hoc duties assigned by the Head of IT from time to time
• Accept responsibility for personal development within the scope of the role and encourage the development of others

Technologies

• ASP.NET
• Azure
• C#
• CI/CD
• DevOps
• Git
• Support
• SQL
• Web
• Cloud

More

We are a fast growing and highly successful organisation offering excellent training and career development opportunities for the right candidate. This is a hands‑on Software Developer role focused on developing, enhancing and supporting customer‑facing, operational and internal systems across a mixed legacy and modern estate. We offer a basic salary of £55,000 to £60,000 plus excellent benefits. The role is based in our Southampton office two days per week, with three days remote working.

last updated 33 week of 2026