Senior Frontend Engineer at Horsefly Analytics, Manchester. I build production TypeScript and React for a labour-market analytics platform, and I work on the AWS and AI-agent infrastructure behind it.

Most of what I enjoy is the unglamorous half: parser edge cases, streaming protocols, the failure modes that only show up under real input.

I contribute fixes upstream to packages the JavaScript ecosystem depends on. Each one below is a bug I reproduced, traced to a root cause, and verified against a differential build before opening.

Merged and released

• benjamn/recast#1438 — comment tokens sit in loc.tokens for the babel, TypeScript and flow parsers but not for esprima or acorn, so a comment between a node and its enclosing parenthesis hid the parenthesis from hasParens() and the printer emitted a second pair. This broke recast's own documented print(parse(source)) === source identity on unmodified source. Verified across 5,076 generated inputs: 2,540 identity violations fixed, zero regressions. Shipped in 0.23.20 — a package with ~139M downloads a month.
• postcss/postcss-selector-parser#330 — unclosed [, ( and a trailing | threw a raw TypeError instead of the parser's own error. Shipped in 7.1.5 — ~574M downloads a month.
• corsairdev/corsair#111 — improved the Telegram integration plugin.

In review

• shadcn-ui/ui#11463 — the Tailwind prefix transform rebuilt class literals as quoted source text by hand, so the step that stripped the delimiters also stripped every quote inside the class value. [stroke='#fff'] became [stroke=#fff], which is not valid CSS, so the browser silently discarded the rule. Found by reading the CLI source rather than from a bug report. Verified over all 1,435 registry components: 1,404 byte-identical, zero regressions.
• postcss/postcss-selector-parser#335 — attribute selectors with no valid attribute name threw a raw TypeError, or emitted the literal string undefined into CSS. Verified against 43,200 generated selectors.
• postcss/postcss-selector-parser#336 — $ dropped from attribute names, breaking Sass interpolation like [#{$attr}].
• postcss/postcss-selector-parser#337 — lossless mode dropped trailing whitespace when a selector ended before any node was created.
• Fixes also pending review in hast-util-from-parse5, eslint-plugin-import, stacktrace-parser, xml-js and eslint-plugin-react-native.

• llm-guard — validating and securing LLM prompts, in TypeScript.
• bedrock-ui-stream — bridges AWS Bedrock Agent Runtime event streams to the Vercel AI SDK UI message stream protocol. Handles the parts that bite: chunk boundaries splitting multi-byte characters, partial tool-call state, and redaction on the error path.

• MSc Computer Science, Manchester Metropolitan University
• AWS Certified Solutions Architect
• Cyber Runway Launch 2024 — the DSIT-funded national cyber accelerator delivered by Plexal
• Volunteer mentor, Manchester Metropolitan University

TypeScript · JavaScript · React · Next.js · Node.js · AWS · PostgreSQL · Docker · Terraform

Website · LinkedIn