Callum Walton

Callum Walton

Cardiff, United Kingdom

Callum Walton

Web Developer & Software Engineer
Category : Web development
I am a versatile, high-impact Software Engineer with a track record of delivering foundational applications for FTSE 250 clientelle. I have worked in a variety of estates of software and deliver to the highest quality I can provide for all work, I offer an open ended amount of services based on your needs but as some ideas I can cover the following:

System Rescues & Bug Fixing:
Do you have an older, legacy application that runs slow, crashes, or is too scary to update? I excel at untangling messy codebases. I can step in, stabilize your system, fix lingering bugs, and modernize it without needing a completely expensive rebuild.

Automations & API Integrations:
Stop moving data manually between your CRMs, accounting software, and websites. I build secure, custom connections (APIs) that make your disconnected tools talk to each other automatically.

Bespoke Software: Off-the-shelf software doesn't always fit. From bespoke customer portals to internal inventory dashboards, I design and build secure, lightning-fast web applications from the ground up, built perfectly to match your unique business processes.

While I am predominately C# based, I am a language-agnostic engineer who prioritizes delivery-focused architecture. I believe in choosing the right tool for the specific challenge; while I am an expert in Clean Architecture and Domain-Driven Design (DDD), I recognize that not every system requires heavy abstraction. My approach is always tailored to the client's needs—balancing robust engineering with the speed and simplicity required for effective delivery.

My expertise spans the entire development lifecycle, from architecting Greenfield systems to modernizing complex Brownfield legacy environments. I bridge the gap between software and scale, specializing in Infrastructure as Code (IaC) via Terragrunt to design and host AWS environments. I don't just build features; I cost-optimize and performance-tune infrastructure to ensure developed projects remain lean and fast.

I am highly proficient across the full stack, utilizing Blazor to build interactive front-ends alongside HTML5, CSS/SASS, and JavaScript. On the back-end, I leverage EF Core, MediatR, and SQL Server to create resilient data layers. Whether navigating high-pressure short-term rebuilds or collaborating on long-term enterprise projects, I bring a unique blend of freelance agility and corporate rigour to every sprint.

Technical & Architectural Toolkit
Engineering Philosophy: Pragmatic Architecture, Delivery-Led Design, SOLID, CQRS.
Cloud & DevOps: AWS, Terragrunt, Terraform, Infrastructure Hosting, Cost/Speed Optimization.
Back-End Ecosystem: C#, .NET 10/Core, EF Core, Web API, SQL Server (Complex T-SQL), PostgreSQL.
Front-End & Web: Blazor, Razor Pages, JavaScript, HTML5, SASS/CSS, CMS Integration.
Patterns & Frameworks: Clean Architecture, DDD, MediatR, Microservices.

Working hours

  • Monday:08h00 To 18h00
  • Tuesday:08h00 To 18h00
  • Wednesday:08h00 To 18h00
  • Thursday:08h00 To 18h00
  • Friday:08h00 To 18h00
  • Saturday:Not available
  • Sunday:Not available
  • 🇬🇧 English
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