Daniel Lockyer

Sebastian Grodzicki

CTO, Levity

Daniel doesn't just optimize code - he transforms how your entire team thinks about performance. Within his first week, he'd already uncovered a memory leak in Zod that the library author acknowledged publicly, and found that a single CSS animation was burning 20-30% of our idle CPU.

Over six months across two of our products, he delivered one jaw-dropping win after another: a 5x speedup in our email analysis pipeline, the elimination of React re-renders that were crippling our workflow canvas, n+1 queries nobody had noticed, and a full Datadog observability stack where we previously had none.

What really sets Daniel apart is the depth of his debugging. He traced a bug in the Datadog tracing library that got the CEO of Vercel, the Tech Lead for Next.js, and a Staff Engineer at Datadog all working together to fix it. If you have performance problems you think are just "how things are", hire Daniel. They're not.

Matt Langan

Founder, Darts Atlas

Daniel injected a culture of performance.

It's a special engagement where someone can come in from the outside, and immediately identify material gains that cost next to nothing. No ramp-up needed. Just delivering value from day 1.

There was so much low-hanging fruit to slash, with the most simple and safe changes you could imagine. They were free wins.

John O'Nolan

Founder + CEO, Ghost

Daniel is the person you call when you have performance problems you can't pin down. He's proactive, highly productive, and has a rare ability to trace complex issues across your entire stack, finding root causes that cross team boundaries and engineering functions.

During incidents and crises, he was always our go-to person.

If you're dealing with scaling challenges or elusive bugs, hire him.

Scott Baxter

First Internet

We've worked with Daniel since 2018, and he's been an outstanding expert for our team. He dramatically optimised our infrastructure, reducing server load and significantly improving performance and uptime.

His proactive approach means he's often resolved potential issues before they become real problems. Daniel is highly responsive and approachable in his communication.

If you're looking for a skilled, dedicated, and reliable specialist, Daniel is your man!!!

Nicolas Le Roux

Founder, La Langue Francaise

Daniel optimized the performance of my website, which has over 2,000,000 monthly visitors, in a quick and efficient manner. He reduced the CPU load and loading time of the site regardless of the poor efficiency of third-party ads.

I really appreciated his answers to my questions regarding server management and optimization throughout the process.