Senior ASP.NET Developer (Freelance/Contract)

Senior ASP.NET Developer (Freelance/Contract)

Posted 2 weeks ago by Calgary Connex Ltd

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Negotiable
Undetermined
Remote
United Kingdom
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Active Server Pages (ASP) Advertisement Amazon Web Services (AWS) Artificial Intelligence ASP.NET ASP.NET Core Branding C# (Programming Language) Cloud Computing Cloud Technology Continuous Integration and Continuous Delivery Entity Framework Front End (Software Engineering) Management Metadata React.js Scalability Software Development SQL (Programming Language) Vue.js Workflows

Summary: The Senior ASP.NET Developer role is a freelance or short-term contract position focused on enhancing a customer self-service platform. The developer will collaborate with the product owner to refine requirements and deliver new features, primarily using ASP.NET Core and Vue.js. This position is ideal for a self-sufficient individual who enjoys working autonomously while contributing to a modern and scalable product. The project is estimated to last 8-10 weeks, with potential for future work.

Key Responsibilities:

  • 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

Key Skills:

  • 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)

Salary (Rate): undetermined

City: undetermined

Country: United Kingdom

Working Arrangements: remote

IR35 Status: undetermined

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

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 Responsibilities

  • 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
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