Leonardo Lemos

Frontend engineer, architecture enthusiast, and open-source contributor—building accessible, scalable web software.

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Latest posts

Juniors, You Have to Earn AI

11 July 2026

An AI agent multiplies the skill you already have. If that skill is zero, the multiplier doesn't save you; it just helps you be wrong faster and more expensively.

The AI Design System You Should Actually Build

3 April 2026

Don't fall into the trap of AI-does-it-all-for-you. MVPs are great, but they're not the only way to build a product.

Don't be stupid – Be an engineer

9 August 2025

Don't fall into the trap of AI-does-it-all-for-you. MVPs are great, but they're not the only way to build a product.

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Experience

Software Engineer, Frontend

Dec 2024 - Present
Credo AI (via TECLA.io)
Skills

React, TypeScript, JavaScript, Next.js, Tailwind CSS, CSS/HTML, Figma, Storybook, Jest, Cypress, Prettier, Technical Writing, ESLint, CI/CD, JIRA, Agile, Scrum, Nx, Git, GitHub, Docker, Kubernetes, AWS, Cursor, Yup, Zod

Software Engineer, Frontend

Jul 2022 - Dec 2024
Anheuser-Busch InBev
  • Achieved an 87.5% decrease in the application's first paint time, improving it from 6.4 seconds to 0.8 seconds by building a backend-for-frontend service with NestJS, handling 30 HTTP simultaneous requests.
  • Collaborated with designers and backend developers to integrate front end and conduct code reviews and provided feedback to team members.
  • Implemented scalable and efficient front-end solutions to optimise website performance and loading times for better user engagement.
  • Utilised debugging tools and techniques to troubleshoot and resolve technical issues promptly. Documented technical specifications, guidelines, and best practices to facilitate knowledge sharing and support efficient onboarding of new team members.
  • Secured 63% of AB-InBev's $57.8B revenue for 2022 by spearheading digital transformation initiatives, enabling transactions with various vendors.
  • Slashed bugs and code smells by 38% utilizing ChatGPT (AI), LangChain, and Azure pipelines, and meticulously crafted 180 unit and end-to-end tests across three repositories to ensure bug-free operations.
  • Streamlined development process by 60% by independently architecting the organisation's web application design system for B2B e-commerce, now catering to over 3M monthly active users.
  • Mentored and onboarded a team of four professionals, offering transparent guidance on roles and responsibilities, and creating intuitive software documentation to enhance UX.
Skills

React, JavaScript, TypeScript, Next.js, Tailwind CSS, CSS/HTML, Redux, Jotai, Zustand, Node.js, NestJS, Yup, Docker, Kubernetes, Terraform, Azure DevOps, Azure Active Directory B2C, Astro, Git, GitHub, Jest, Vitest, Java, Storybook, Cypress, Prettier, ESLint, CI/CD, Agile, Scrum, JIRA, Cursor, LangChain, ChatGPT, SonarCloud, SonarLint, Segment

Software Engineer, Frontend

Feb 2020 - Jul 2022
Smarten Venture Builder
  • Boosted net promoter score by 15% points through deployment of accessible fiscal and legal automation features, significantly improving customer satisfaction.
  • Captivated over 15K new customers to organization by creating a minimal viable product in just three months at age of 16, using React.js, TypeScript, Next.js, and GitLab
  • Mentored and onboarded four new professionals, enhancing team capabilities and ensuring robust cross-functional collaboration.
  • Enhanced user experience and operational efficiency at Smarten Venture Builder by spearheading development of 12 user-centric applications, including all testing, planning, rollout, and debugging efforts.
  • Drove adoption of new technologies tailored to specific products and features, contributing to continuous innovation of development process.
  • Increased feature delivery threefold by transitioning monolith and semi-monolith applications to microservice and micro front-end architectures.
  • Streamlined legal document release process, reducing average user's time to under one minute and expanding monthly active user base to over 70K within a year.
  • Applied industry best practices to foster developer rotation and improve team culture, while rigorously testing SaaS platform quality using frameworks like Cypress, Jest, and Playwright.
Skills

React, React Native, JavaScript, TypeScript, CSS/HTML, Figma, Jest, Storybook, Cypress, Prettier, ESLint, Redux, GitLab, GitLab CI/CD, GitHub, Git, Docker, Kubernetes, Amazon Web Services (AWS), Terraform, CI/CD, Agile, Scrum, JIRA, Playwright, Microsoft Clarity, Sentry