Senior Full Stack C# .NET DeveloperFully Remote (UK Residents Only)
About WebX Systems At WebX, we specialise in technical publishing and content management solutions for the aerospace and defence sectors worldwide. Our flagship products— UltraCSDB®, UltraAuthor™, UltraXML™, and UltraPortal™—are used globally and combine proven legacy systems with cutting-edge, cloud-native innovations.
As a privately owned UK business, we take pride in delivering exceptional software and highly responsive support. Join us on our journey to become the global leader in aerospace and defence content management.
Role Overview We're looking for a proactive, experienced Senior Full Stack .NET Developer to help evolve our product suite. You’ll work across both legacy Windows desktop applications and modern web-based systems and help lead the transition toward cloud-native architecture. C#, .NET Framework, WinForms, WCF
Client-Server Architecture, MS SQL Server
NET 9, Blazor, Minimal APIs
NET), Cloud-Native development
Project Leadership – Lead projects from concept to deployment, collaborating with senior developers and the technical director to design and implement architectural and technical solutions.
Full Stack Development – Maintain and enhance both legacy desktop applications and modern browser-based web apps.
Legacy-to-Modern Migration – Help drive the migration from WinForms to Blazor-hosted cloud solutions.
Code Quality & Testing – Write clean, maintainable, well-tested code, and conduct peer reviews.
5+ years of commercial experience in C# and .NET.
~ NET Framework and WinForms
~ NET (.NET 9)
~ SQL Server (including performance optimisation)
~ Front-end tech (HTML, CSS, JavaScript)
~ Proven experience with application modernisation, including migrating legacy WinForms applications to modern web platforms (Blazor preferred).
· Strong understanding of layered architecture and best practices in software design.
Proven ability to deliver complex software projects independently.
Degree in Computer Science or related field (or equivalent experience).
Bonus Points For
NET Aspire and containerisation (e.g. CI/CD pipelines, DevOps practices
XML/XSLT and publishing workflows
Experience using AI-based coding assistants (e.g. Claude, ChatGPT, GitHub Copilot) to boost productivity and code quality.
Salary : £70,000 – £85,000 depending on experience
Career Advancement – Opportunities to progress and grow as you help lead the next phase of our technology evolution.
Work-Life Balance – Fully remote role with flexible working arrangements to support your productivity and well-being.
Professional Development – Dedicated budget and support for ongoing training, certifications, and learning new technologies.
Competitive Benefits – Workplace pension, annual leave that increases with tenure, and a supportive culture for professional growth.
Team & Culture We’re a small, collaborative, and fully remote team. We value async-first communication and structured collaboration. Introductory video call
# Fully remote