About Siege21

I’m Antony Doyle.

I’m a software engineer with more than 18 years’ experience. Siege21 is my independent consultancy, based in the UK and working remotely with clients here and abroad.

01 / Experience

Web applications, APIs and backend systems.

My work spans frontend engineering and accessibility, backend services, search, data-intensive systems and distributed applications.

I work across languages and platforms, adapting to the application and the people who maintain it. My focus is understanding how the system behaves and what it needs to do.

When I review an application, I follow how a task moves through the system: what the user sees, which rules run, where the data goes and what happens if a part fails. That helps me explain both the problem and the changes needed to fix it.

02 / Working with me

What you can expect.

I’ll ask what the software needs to do and what is getting in the way. We’ll agree the scope before I start, including what you’ll receive and any access I need.

For reviews, I explain how I reached each finding and flag anything I haven’t been able to verify. For development, you’ll see working versions as the project progresses.

I work with applications built by developers and with AI tools. In either case, I check the behaviour and the code before recommending changes. If part of the work needs expertise I don’t have, I’ll say so.

Handover includes the instructions and decisions someone else will need to maintain the application. You can continue with me or take the work to your own team.

Get in touch

What do you need help with?

Tell me what you’re building or what has become difficult to maintain.

Contact Antony