Senior .NET Developer & Architect · Midlands, UK

21 years of .NET — building, modernising, and shipping

Senior .NET contractor for greenfield builds, legacy modernisation, Azure and AWS infrastructure, and hands-on delivery. Available for fixed-price diagnostics or flexible day-rate engagements.

.NET Framework to .NET 10 · VB.NET to C# · WinForms to Blazor · Fixed price · No retainer

Track record

DB Cargo UK2026

Legacy .NET migration — VB.Net Framework 2.0–4.8 → C# .NET 8/9/10, WinForms → Blazor, Docker containerisation, Azure DevOps CI/CD.

CMS Analytics2024–25

.NET Core 3.1 & Framework 4.8 → .NET 8/10, AWS Lambda event-driven processing, S3 document storage, financial PDF and MICR generation.

Arrow / Mars Capital2023–24

Allied Irish Bank mortgage platform — 5-solution legacy modernisation, Angular 6→18, .NET 6/7/8 AWS Lambdas, Azure Service Bus, Aspose document generation.

21+Years .NET
APIto UI
£399From
Azure & AWS cloud migration·.NET Framework 4.x · VB.NET · WinForms · Blazor·Enterprise-grade background·SC Cleared (previously)

What I offer

How I can help.

Fixed-price and fixed-scope. No open-ended retainers. Whether you need a .NET codebase audit, a cloud infrastructure review, or a technical strategy session — you know exactly what you're getting before you commit. Day-rate engagements also available for ongoing delivery work.

015 working days

.NET Codebase Audit

£399

A fixed-price written audit of any .NET codebase — legacy .NET Framework migrations to .NET 10 LTS (including VB.NET to C# and WinForms to Blazor), architecture review, risk register, and prioritised action plan. Delivered async with read-only repo access.

  • Codebase inventory and dependency map
  • Architecture and quality assessment
  • Risk register with effort estimates
  • Prioritised action plan
  • 30-minute walkthrough call
Book this audit
025 working days

Cloud & Infrastructure Review

£499

Expert review of your cloud setup — Azure, AWS, or hybrid — against best practices. Ideal for teams whose infrastructure was set up by developers rather than cloud architects. Covers security, cost, CI/CD, and environment hygiene.

  • Security gaps and exposure report
  • Cost optimisation opportunities
  • CI/CD and deployment pipeline assessment
  • Prioritised remediation list
  • Written recommendations doc
Book this review
0390-minute video call

Technical Strategy Session

£750

Bring your hardest technical problem — architecture decisions, stack choices, legacy modernisation, or DevOps strategy. A structured 90-minute call with a senior architect, followed by written recommendations.

  • Session recording
  • Written recommendations document
  • Follow-up email Q&A (48-hour window)
  • Actionable next steps, prioritised
Book this session

Questions

Common questions

James Mills

Senior .NET Full-Stack Developer & Architect


”Good code, built right, deployed properly — that's the whole job.”

21+ years · .NET specialist

About

21 years building, shipping, and scaling .NET systems

I've spent 21+ years contracting across enterprise and high-growth environments — from Next PLC and EON to fintech, logistics, and government. My background spans the full stack: Angular to ASP.NET Core to cloud infrastructure, with deep experience in legacy .NET Framework migration, DevOps, and API integration.

Recent work includes a large-scale .NET migration — VB.NET and WinForms to C# and .NET 10, containerised for Azure — alongside greenfield SaaS builds, AWS Lambda architectures, and Azure infrastructure overhauls. Previously SC Cleared with government-sector security experience.

UK-based and remote-first. Available fixed-price for defined diagnostic work or day-rate for ongoing delivery. I work best where technical depth and delivery speed both matter.

.NET 8/9/10C# / VB.NetASP.NET CoreAngular 18TypeScriptBlazorAzureAWSDockerKubernetesTerraformGitHub ActionsAzure DevOpsEF CoreSQL ServerPostgreSQLRedisMicroservicesREST / WebAPICI/CD Pipelines

Get in touch

Book a Service or Get in Touch

What happens next

  1. 01You’ll receive a confirmation email within 2 hours
  2. 02James will review your enquiry and reply within 1 working day
  3. 03If applicable, you’ll receive a booking link and invoice