Edinburgh, Scotland

Software
built to last.

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

Start a project See our work
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C# / .NET ◆Umbraco CMS ◆React & Next.js ◆SQL Server ◆Azure ◆React Native ◆SEO Optimisation ◆Full-Stack Contracting ◆ 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.

01
🌐
Web Development

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

02
📱
Mobile Applications

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

03
⚙️
CMS Architecture

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

04
🔍
SEO & Performance

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

05
💼
Contracting

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

06
🚀
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

All projects →
Field Service Mobile App
Mobile · API 2024
Field Service Mobile App

React Native with offline sync for field engineers, backed by a C# REST API and SQL Server.

React NativeC# REST APISQL ServerOffline sync
Headless Umbraco Platform
Web · CMS 2024
Headless Umbraco Platform

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

Umbraco 13Next.js 14.NET 8Azure
E-commerce SEO Overhaul
Web · SEO 2023
E-commerce SEO Overhaul

Technical SEO audit, structured data, crawl fixes, and Core Web Vitals improvements across a large product catalogue.

Technical SEOSchema.orgCore Web Vitals
Umbraco 7 → 13 Migration
Migration 2023
Umbraco 7 → 13 Migration

Full platform migration from .NET Framework to .NET 8. Rebuilt document types, migrated content, modernised the front-end.

Umbraco 7→13.NET 8Content migration
How we work

A clear process,
no surprises

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

Technology

Built with tools that last

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

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, ScotlandUK & remote projects welcome
⏱
Response within 24 hoursUsually much sooner
Thanks — message received. I'll be in touch within 24 hours.

No spam. Your details are only used to respond to your enquiry.