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I’m a Full Stack Software Engineer with 7+ years of experience building scalable web applications for both enterprise teams and fast-moving startups. I specialize in React, Next.js, and TypeScript, and I’ve worked across the stack with Node.js, PHP, and SQL-based systems to deliver reliable, maintainable features. I’ve also led and supported modernization efforts—migrating legacy systems into headless, cloud-ready architectures, redesigning APIs, and improving performance for better user and developer experiences. I’m comfortable working from greenfield builds through large-scale platform upgrades, and I like using AI-assisted development workflows (like Cursor, GitHub Copilot, and Claude Code) to improve delivery speed and code quality.…I’m a Full Stack Software Engineer with 7+ years of experience building scalable web applications for both enterprise teams and fast-moving startups. I specialize in React, Next.js, and TypeScript, and I’ve worked across the stack with Node.js, PHP, and SQL-based systems to deliver reliable, maintainable features. I’ve also led and supported modernization efforts—migrating legacy systems into headless, cloud-ready architectures, redesigning APIs, and improving performance for better user and developer experiences. I’m comfortable working from greenfield builds through large-scale platform upgrades, and I like using AI-assisted development workflows (like Cursor, GitHub Copilot, and Claude Code) to improve delivery speed and code quality.

Leonel Oliveira

Front-End Developer, Full Stack Developer, Web Developer, +2

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I’m a Full Stack Software Engineer with 7+ years of experience building scalable web applications for both enterprise teams and fast-moving startups. I specialize in React, Next.js, and TypeScript, and I’ve worked across the stack with Node.js, PHP, and SQL-based systems to deliver reliable, maintainable features. I’ve also led and supported modernization efforts—migrating legacy systems into headless, cloud-ready architectures, redesigning APIs, and improving performance for better user and developer experiences. I’m comfortable working from greenfield builds through large-scale platform upgrades, and I like using AI-assisted development workflows (like Cursor, GitHub Copilot, and Claude Code) to improve delivery speed and code quality.…I’m a Full Stack Software Engineer with 7+ years of experience building scalable web applications for both enterprise teams and fast-moving startups. I specialize in React, Next.js, and TypeScript, and I’ve worked across the stack with Node.js, PHP, and SQL-based systems to deliver reliable, maintainable features. I’ve also led and supported modernization efforts—migrating legacy systems into headless, cloud-ready architectures, redesigning APIs, and improving performance for better user and developer experiences. I’m comfortable working from greenfield builds through large-scale platform upgrades, and I like using AI-assisted development workflows (like Cursor, GitHub Copilot, and Claude Code) to improve delivery speed and code quality.

Available to hire

I’m a Full Stack Software Engineer with 7+ years of experience building scalable web applications for both enterprise teams and fast-moving startups. I specialize in React, Next.js, and TypeScript, and I’ve worked across the stack with Node.js, PHP, and SQL-based systems to deliver reliable, maintainable features.

I’ve also led and supported modernization efforts—migrating legacy systems into headless, cloud-ready architectures, redesigning APIs, and improving performance for better user and developer experiences. I’m comfortable working from greenfield builds through large-scale platform upgrades, and I like using AI-assisted development workflows (like Cursor, GitHub Copilot, and Claude Code) to improve delivery speed and code quality.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Portuguese

Fluent

Work Experience

Software Engineer at Thrillworks

April 1, 2025 - June 1, 2026

Led the frontend and full-stack architecture for Abbott’s CMS migration initiative, transitioning from Contentful to Strapi. Improved content delivery workflows and enhanced system maintainability while coordinating with backend and DevOps teams to ensure seamless integration and deployment across environments. Delivered a modernized headless CMS setup using GraphQL and REST APIs, with a responsive, component-driven UI approach and automated testing practices.

Full Stack Developer (Contract) at 1Password

May 1, 2024 - March 1, 2025

Collaborated on a headless CMS migration using React, Next.js, and TypeScript. Built reusable components and supported the evolution of an internal design system. Translated Figma designs into responsive UIs, improved accessibility with semantic HTML and ARIA practices aligned to WCAG, and worked closely with UX/UI teams to ship production-ready interfaces. Participated in Agile ceremonies including standups, sprint planning, and code reviews with engineers, QA, and designers.

Full Stack Developer at Valoris Group

February 1, 2022 - March 1, 2024

Built an internal Site Builder platform to replace third-party tools. Worked with a legacy Craft CMS (PHP/MySQL) backend while modernizing the frontend architecture using React and Next.js, contributing to incremental modernization of legacy systems. Supported CI/CD practices and API-driven integration, helping unify development workflows and platform consistency across the product experience.

Front-End Developer at Click Health

April 1, 2021 - February 28, 2022

Developed responsive web applications and reusable component libraries to improve development speed and UX consistency. Delivered UI implementations using modern front-end practices and collaborated on integration with APIs and existing platforms.

Frontend Developer at Click Health

April 1, 2021 - February 1, 2022

Built responsive web applications and reusable component libraries to improve development speed and enhance UX consistency. Contributed to frontend implementation quality using modern web standards and component-based UI development, supporting maintainable styling and API integration where needed.

Front End Developer at Ryerson (Startup Accelerator)

March 1, 2020 - April 30, 2021

Created investor-focused UI prototypes with polished interfaces to support startup pitch and acceleration program goals. Built interactive front-end prototypes using React and web technologies to help teams communicate product value effectively.

Front End at Ryerson

March 1, 2020 - April 1, 2021

Created prototypes with polished interfaces to help startups advance through investor pitch programs. Worked on responsive UI implementation and supported product-facing prototype experiences using web technologies and API integration.

Junior Full Stack Developer at Lendifie (Education/Fintech product team)

July 1, 2019 - March 31, 2020

Developed user journeys to improve conversion funnels and optimized React-based applications. Worked with front-end and supporting services using JavaScript and Node.js to deliver incremental growth and usability improvements.

Jr Full Stack Developer at Lendifie

July 1, 2019 - March 1, 2020

Developed user journeys to improve conversion funnels and optimized React-based applications. Supported backend integration with Node.js and Firebase, improving performance and user experience while delivering features for product growth.