.Net Developer - C#, Agile

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