Web Developer – SaaS – Swindon (Hybrid, 3 Days in Office)
(Tech stack: Web Developer, .NET Framework, WebForms, ASP.NET MVC, React, TypeScript, SCSS, Accessibility, API Integration, Performance Optimisation, Testing, Front End Developer)
Our client is an established technology business that builds and maintains sophisticated digital platforms used across multiple sectors. They’re embarking on a major UI modernisation programme, evolving their existing .NET WebForms interface into a cutting-edge modern front end using React and ASP.NET MVC.
They’re seeking a Web Developer who enjoys working across both legacy and modern stacks, someone comfortable maintaining and optimising an existing UI while helping to drive a structured migration to a next-generation front end.
This is a fantastic opportunity to join a stable, forward-thinking company that values technical craft, clean architecture, and collaboration.
Key Responsibilities:
Maintain and enhance an existing .NET WebForms UI while supporting a structured migration to MVC and React.
Build modern React components and features (hooks, routing, forms, error boundaries).
Integrate with ASP.NET Core APIs, ensuring resilient data flows and error handling.
Develop and maintain a reusable component library and manage CSS architecture, responsive layouts, and theming.
Ensure accessibility and semantic HTML standards are met.
Optimise front-end performance, applying modern best practices.
Implement client-side authentication flows and manage secure sessions.
Write and maintain front-end tests covering key user journeys.
Own and maintain front-end tooling and collaborate closely with backend developers, designers and PMs.
Skills & Experience:
Strong experience with .NET WebForms (pages, controls, lifecycle) and ASP.NET MVC/Razor views.
Proficiency in React (ideally TypeScript) including components, hooks, and state management.
Deep understanding of HTML5, CSS3, modern JavaScript/TypeScript, responsive design, and browser behaviour.
Hands-on experience with accessibility standards (WCAG), semantic markup, and ARIA.
Knowledge of performance tuning techniques including lazy loading, code splitting, and asset optimisation.
Experience consuming secure REST APIs from the browser.
Familiarity with front-end testing frameworks such as Jest, React Testing Library, Playwright or Cypress.
Solid understanding of modern front-end tooling (e.g., npm/yarn, Vite/Webpack, ESLint/Prettier).
Strong communication and collaboration skills across technical and non-technical stakeholders.
Nice to Have:
Exposure to Blazor or other component-based .NET front-end approaches.
Experience with Storybook, SCSS architecture, or Tailwind.
Knowledge of SEO, analytics, and internationalisation strategies.
Practical experience with incremental UI migrations from legacy frameworks.
This is an excellent role for someone who enjoys a balance between modern front-end development and legacy UI migration, with the opportunity to shape a modern platform from the ground up.
Location: Swindon, UK (Hybrid – 3 days in the office after probation)
Salary: £35,000 - £40,000 + Benefits
Applicants must be based in the UK and have the right to work in the UK.
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About True Potential
True Potential LLP is an industry leader in financial services technology, delivering award-winning software solutions to nearly 20% of UK financial advisers. The company has grown from scratch to c.£400m annual sales and over 600 head office staff, servicing over £30bn of assets under management, and we are on the next stage of our journey. Our technology team is at the forefront of innovation, developing secure, high-performance applications that drive the future of financial services. If you're passionate about building robust applications in a dynamic, fast-paced environment, True Potential is the place for you.
About the Role
We are looking for a C# .NET Developer to join our growing team. You’ll report to the Head of Development, and will play a key role in designing, developing, and maintaining high-quality applications that support both our internal teams and external customers. You’ll have the opportunity to work on both B2B and B2C applications, using the latest .NET technologies. As True Potential continues to grow, you’ll be part of an ambitious, high-performing team where your contributions will make a real impact.
Responsibilities
Develop and maintain custom web applications using C#, .NET Core, ASP.NET, and SQL Server.
Design, develop, and test applications using .NET and front-end technologies.
Contribute to software architecture and coding best practices.
Work closely with internal teams to identify opportunities for automation and process improvement.
Stay up to date with emerging technologies and industry trends.
About You (Skills & Experience)
We’re looking for a developer with:
3+ years of experience in C# .NET development.
Proficiency in C#, ASP.NET, .NET Core, and VB.NET.
Familiarity with web technologies (ASP, HTML, JavaScript, VBScript).
Knowledge of software design principles.
Experience with Git, Continuous Integration, and unit testing.
Understanding of Microsoft Azure, front-end frameworks (Telerik/Kendo), and SQL Server (desirable).
Strong problem-solving skills and attention to detail.
Why Apply?
This is a great opportunity to work in a forward-thinking, technology-led business where your skills will be valued and developed. You’ll be part of an innovative team, working on exciting projects that make an impact, with opportunities to collaborate, grow and develop.
Interested candidates should send their CV to Core-Asset Consulting at truepotential@core-asset.co.uk, or call +44 131 718 4600 for a confidential discussion. Core-Asset Consulting is exclusively retained to manage this role. Any speculative CVs or direct applications will be forwarded to Core-Asset Consulting. No agency fees will be payable, and all CVs submitted for this role will be handled exclusively by Core-Asset Consulting.
Core-Asset Consulting is an equal opportunities recruiter and we welcome applications from everyone irrespective of age, disability, gender, gender identity or expression, race, colour, ethnic or national origin, sexual orientation, religion or belief, marital/civil partner status or pregnancy.
Job reference: 15931
To apply for this vacancy applicants must be eligible to work in the UK in accordance with the Immigration, Asylum and Nationality Act 2006.
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Core-Asset Consulting offers specialist recruitment services to asset management, accounting & finance, asset servicing, legal and the wider financial services sector in Scotland.
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