Custom Software Development & Integrations

New business applications designed and built from scratch, taking the whole project from the first requirements through to deployment. I also build APIs, integrations and new features for the systems you already have. I work with C#, ASP.NET Core, React and SQL Server, or the platform that best fits your project.

Complete projects, from requirements to deployment

I can take responsibility for an entire custom software project. As an independent developer, I handle each stage myself, so you deal with one person who understands the whole application, from the business rules to the database to the screens your team uses.

Requirements: working with you to understand the business process and agree what the application needs to do
Database architecture: designing the tables, relationships and stored procedures the application will rely on
Backend development: the business logic, security and data access, typically in C# and ASP.NET Core
Front-end development: clear, usable screens for the people who will use the system every day, for example in React
APIs and integrations: connecting the new application to payment providers, accounting software, CRMs or your existing systems
Testing: checking the application works correctly, with realistic data, before it goes live
Deployment: putting the application into production and making sure it runs reliably

After launch, I can stay on to support the application and add what the business needs next, so you aren't left looking for someone new to learn it.

What I build

Business applications

Back-office systems, admin tools and internal applications that replace spreadsheets and manual steps, built for the way your team works.

Dashboards and reporting

Clear views of your business data, with the queries behind them written to stay fast as the data grows.

APIs

REST APIs in ASP.NET Core that let your systems, partners or front ends work with your data safely and consistently.

System integrations

Connecting your software to other systems and external services, such as payment providers, CRMs, accounting software or partner systems, so information moves automatically instead of being re-typed.

Workflow automation

Scheduled jobs, imports and exports, notifications and background processing, for example with Azure Functions, that take repetitive work off people's desks.

Client and member portals

Secure areas where your customers or members log in to see documents, register or manage their details.

Starting fresh or building alongside what you have

Some projects start from a blank page. Others need to work with an existing database, an older application or established business processes. I'm comfortable with both, and my experience with older and newer technologies helps when a new application has to fit into an existing environment.

Where it genuinely helps, I can also add practical AI features, such as summarizing data or drafting routine text, on top of solid, maintainable code.

Projects of any size are welcome. A complete new application and a single new feature or integration are both good reasons to get in touch.

Applications I've built

A secure document portal where an accounting firm's clients log in and download their files by year and type
A registration and database system for a consulting group's conferences, foundation database and newsletters
A custom shopping cart and back office covering stock, inventory, orders and reporting

Technologies

C#, ASP.NET Core, REST APIs, Azure Functions, React, SQL Server and T-SQL, plus PHP, MySQL, JavaScript and jQuery when they suit the project or your existing environment better.