Sentinel: Your Web-Performance Watchman

Your Website, Faster.

Harry’s tailored workshop was nothing short of fantastic—a real eye-opener, helping our team level up their scalable CSS architecture skills. The entire team left learning something new, and to say that what was covered will have a large impact on our work is an understatement. We can’t recommend him enough.

Addy Osmani, Google

I help companies of all shapes and sizes to assess, identify, and fix site-speed issues. Through a combination of audits, consultancy, and training, let’s find out what web performance means for your business, and how to ensure we’re on top of things.

Suffering? Fix It Fast!


I am available for hire to consult, advise, and develop with passionate product teams across the globe.

I specialise in large, product-based projects where performance, scalability, and maintainability are paramount.