Avelino Teixeira

Independent Full Stack Engineer specialising in AI-integrated systems — Next.js, React, TypeScript, Node.js and OpenAI API. Currently available for full-time remote positions (international market) or senior contracts. Recent project: → Voice Transcription App — Next.js 16 · Whisper · GPT-4o · SSE Streaming 📌 github.com/avelinoteixeira

I reduced the page delivery cycle by 25% through combined SSR/ISR and Contentstack headless CMS integration — eliminating unnecessary round-trips between client and server I built CI/CD pipelines with automated Lighthouse audits as deployment gates — achieved 95+ Lighthouse scores across all production routes, blocking performance regressions before they reached users I integrated GitHub Copilot and Cursor with custom prompt engineering playbooks — accelerated team development velocity by ~20% without compromising code quality I implemented full WCAG 2.1 compliance and an observability layer with performance budgets and error tracking — adopted as the team's frontend quality standard across all new projects

Built a full-stack voice transcription system integrating OpenAI Whisper and GPT-4o — Next.js frontend with real-time SSE streaming and LLM post-processing for automatic transcript cleanup I grew combined organic traffic by 142% through advanced technical SEO: Core Web Vitals, structured data, semantic HTML, and indexation optimisation — measured in Google Search Console over 12 months I reduced bounce rates by 35% through systematic performance audits, strategic code-splitting, and image optimisation — applied across 8 of the 15 projects delivered I architected BFF + GraphQL patterns enabling clean separation between API consumers and upstream services — reduced new endpoint integration time by ~60%

I built a modular design system with 25+ React/TypeScript components documented in Storybook — it became the team's single source of truth and eliminated 98% of runtime styling errors within 6 weeks I established a testing culture from zero: reached 85% code coverage with Jest, React Testing Library, Cypress, and Playwright — starting from 0% automated tests at the beginning of the contract I integrated axe-core into the CI pipeline for automatic accessibility enforcement on every PR — WCAG regressions are now blocked before reaching production

I led the full migration from a legacy stack to Next.js with SSR/SSG — reduced LCP from 3.2s to 1.8s (44% improvement) and increased organic search indexation by 50%, directly correlated with user growth I built and maintained REST and GraphQL integrations with BFF architecture — the separation enabled the team to scale the backend independently of the frontend without breaking API contracts I established ESLint/Prettier standards and API contract documentation adopted by the full engineering team — reduced new developer onboarding time by ~30%