Senior ASP.NET Developer (Freelance/Contract)

Senior ASP.NET Developer (Freelance/Contract)Location: Remote (UK/EU preferred)

Language: Strong English

Contract Type: Freelance or short-term fixed contract, possible growth opportunity

Start Date: ASAP

Project estimation: 8–10 weeks (scope-led)

About the Role

We’re looking for a capable, self-sufficient developer to support our growing success with our customer self service platform You’ll be part of a team to continue to modernisation and help deliver new features that support campaign creation, asset management, and multi-format advertising across digital channels.

You’ll work directly with the product owner to refine requirements, and contribute to a responsive, intuitive interface currently built in Vue.js. This role suits someone who enjoys shaping scalable, real-world products and can work with autonomy and purpose.

Key ResponsibilitiesResponsibilities

• Collaborate with the product owner to refine and shape the product brief
• Design, build, and maintain a scalable ASP.NET Core back end
• Develop a modern, responsive front end (Vue.js preferred; React also considered)
• Implement and manage database access using Entity Framework and SQL Server
• Manage AWS hosting environment
• Report progress clearly and regularly
• Take full responsibility for delivering features end to end

Required Skills & Experience

• ASP.NET Core (C#) Essential
• Entity Framework (code-first, migrations, etc.) Highly desirable
• Strong problem-solving skills and ability to work independently
• Experience delivering complete features from spec to deployment

Desirable

• Vue.js or React knowledge or experience
• UI/UX sensibility
• Experience with AWS or other cloud platforms
• Familiarity with CI/CD pipelines
• Familiarity with AI-assisted tools or generative frameworks (e.g., prompt-based content generation, metadata tagging)

About Connex

Connex empowers employer branding and recruitment teams to create on-brand, engaging, and cost-effective advertising across digital and print — without the need for design support or complex tools.

Our technology helps organisations take control of their brand presence, adapt quickly to recruitment needs, and deliver content with speed and confidence.

This next development phase is focused on enhancing flexibility and scalability — enabling our users to create multi-format campaigns with shared content, efficient workflows and intuitive editing tools.

Why Join Us

• Take technical ownership of a high-impact feature set
• Help modernise a live platform with a growing client base
• Work closely with a product owner in a low-friction, high-trust setup
• Scope for extended work (future versions include various formats, AI)

Traits We Look For

• Self-starter with attention to detail
• Honest and pragmatic in estimating and delivering work
• User-aware and happy to ask questions to clarify logic
• Comfortable working solo, but open to collaboration
• Quality-focused but pragmatic

How to Apply

Please email edallen@calgaryconnex.com with:

• A brief introduction
• CV or portfolio
• 2–3 examples of relevant work
• Your day rate and availability