Edinburgh, Scotland

Software built to last.

Full-stack development, CMS architecture, and mobile applications. Thoughtful code for businesses that care about quality.

C# / .NET ◆Umbraco CMS ◆React & Next.js ◆SQL Server ◆Azure ◆React Native ◆SEO Optimisation ◆Full-Stack Contracting

Who we are

A specialist studio rooted in Edinburgh's tech scene

Propeller Software is Colin Asquith — a full-stack developer with deep expertise in C# / .NET, Umbraco, and React. Projects range from Umbraco CMS builds and headless architectures to cross-platform mobile apps and contract work across the UK.

Direct access to a senior developer on every project. No account managers, no handoffs.

10+

Years of .NET & Umbraco development

C#

Core language & primary specialism

UK

Remote & on-site contracts taken

<24h

Typical first response time

What we do

End-to-end development services

From initial scoping to deployment and beyond. Every engagement is direct — you work with the developer, not a layer of project managers.

  1. Web Development
    Custom websites and web applications. Umbraco CMS, headless architectures, bespoke .NET APIs, and modern front-ends.

  2. Mobile Applications
    Cross-platform mobile apps built with React Native, backed by robust C# REST APIs and offline-first architecture.

  3. CMS Architecture
    Umbraco implementations, version migrations, and headless delivery via the Content Delivery API for multi-channel publishing.

  4. SEO & Performance
    Technical SEO audits, Core Web Vitals tuning, structured data, and crawl issue remediation to drive organic visibility.

  5. Contracting
    Available for full-stack C#/.NET and Umbraco contract roles — remote, hybrid, or on-site across the UK.

  6. Site Modernisation
    Upgrade legacy .NET Framework sites to .NET 8, migrate Umbraco versions, and overhaul front-ends without a full rebuild.

Selected work

Projects & case studies

Field Service Mobile App
React Native with offline sync for field engineers, backed by a C# REST API and SQL Server.
View Project

Headless Umbraco Platform
Umbraco 13 Content Delivery API feeding a Next.js front-end with ISR and Azure CDN edge caching.
View Project

E-commerce SEO Overhaul
Technical SEO audit, structured data, crawl fixes, and Core Web Vitals improvements across a large product catalogue.
View Project

Umbraco 7 → 13 Migration
Full platform migration from .NET Framework to .NET 8. Rebuilt document types, migrated content, modernised the front-end.
View Project

How we work

A clear process, no surprises

Every engagement follows the same structured approach so you always know where you stand.

  • Discovery — Goals, constraints, and honest scoping before any commitment
  • Design & plan — Architecture and UI direction approved before build begins
  • Build & iterate — Short cycles with regular demos and room to adjust
  • Launch & support — Deployment, handover docs, and ongoing options

Technology

Built with tools that last

🔷 C# / .NET
🌿 Umbraco
⚛️ React
▲ Next.js
🗄️ SQL Server
☁️ Azure
📱 React Native
🔁 CI/CD
🐋 Docker
🌐 TypeScript
🛡️ Cloudflare
🔍 Elasticsearch

Let's build something together

Whether it's a new site, CMS migration, mobile app, or a contract role, drop a message and I'll reply within 24 hours.

Edinburgh, Scotland UK & remote projects welcome
Response within 24 hours Usually much sooner