Midweight .NET Developer

We're looking for a Full-Stack .NET/Umbraco Developer to join the team at Design Portfolio, where strategy, creative and tech come together to help forward-thinking companies tell better stories and build genuine trust with their stakeholders.

You'll be working on Umbraco-based platforms and bespoke web applications, taking real ownership of features from design through to deployment, across the full stack. It's a role that suits someone who's comfortable working independently but thrives as part of a collaborative team.

Main responsibilities

• Design, develop, and maintain web applications and CMS-driven platforms using Umbraco and
• .NET / .NET Core (C#)
• Build and customise Umbraco solutions including content modelling, document types, block
• editors, surface controllers, and custom property editors
• Build and maintain RESTful APIs and backend services
• Work with SQL Server to design schemas, write queries, and optimise performance
• Take ownership of assigned features from design through to deployment
• Collaborate with product owners, designers, and QA to deliver business requirements
• Write clean, maintainable, and testable code following best practices
• Participate actively in code reviews, sprint planning, and retrospectives
• Identify and resolve defects, performance issues, and technical debt
• Contribute to technical documentation
• Support production systems and participate in on-call or incident resolution where required

Requirements

For this role, we are looking for a candidate with the following qualifications, experience and

attributes:

• A university degree/degree-level equivalent in Computer Science, Software Engineering, or equivalent professional experience.
• Good command of the English language, with accuracy, proficient keyboard, and strong attention to detail.
• Ambitious, positive and willing to learn
• Able to work from home (due to hybrid working)

Required Skills & Experience

• Solid commercial experience as a .NET Developer in a production environment
• Strong proficiency in C# and .NET / .NET Core
• Hands-on experience with Umbraco CMS (v10+ preferred), including content modelling and back-office configuration
• Experience building web applications and APIs
• Good working knowledge of SQL Server or similar relational databases
• Experience with Git and modern development workflows
• Understanding of object-oriented principles, SOLID design, and clean code practices
• Comfortable with Razor templating and server-side rendering patterns
• Experience working in Agile / Scrum teams
• Ability to work independently and manage your own tasks effectively
• Strong problem-solving skills and attention to detail

Desirable Experience

• Familiarity with Examine / Lucene search within Umbraco
• Experience deploying or supporting applications in Azure (App Service, SQL Database, Blob Storage, Azure Front Door)
• Front-end exposure (e.g. JavaScript, CSS, React or similar a bonus)
• Familiarity with CI/CD pipelines and DevOps practices
• Experience writing unit and integration tests
• Awareness of application security best practices
• Experience modernising legacy systems or working with technical debt

What you'll get

- Flexible hybrid working (London or Leeds)

- 31.5 days' holiday – includes 2 days (16 hours) of personal time and Christmas office shutdown – plus all bank holidays

- Private health cover, Medicash, income protection & profit share (post-probation)

- Training and mentoring programme

- Perkbox rewards + wellbeing allowance

- A genuinely collaborative, values-led team