Open to opportunities

Renan Martins

@renanpontez

Message

Senior Full-Stack Engineer specializing in frontend, performance, and scalable React apps.

Brazil

Message

What I'm looking for

I seek frontend or full-stack roles where I can lead performance-driven projects, mentor engineers, and build scalable, accessible web experiences for high-traffic products.

I am a Senior Frontend Engineer with over 10 years of experience building high-scale web applications across fintech, travel tech, and food e-commerce. I specialize in React, Next.js, TypeScript, Tailwind CSS and delivering performant, accessible user experiences for high-traffic products.

At Planetary I lead frontend development for large-scale sites and apps, architect CMS-driven multilingual solutions, and mentor junior developers through code reviews and best practices. I have driven measurable outcomes such as major page load and Lighthouse improvements, reduced infrastructure costs, and increased conversions.

My technical work includes SSR/ISR implementations, Sanity CMS migrations, geo-redirects and localization, performance optimizations, and building scalable component systems with Storybook. I am comfortable working with REST APIs, Node.js tooling, Redis caching, and payment integrations.

I bring a proactive, team-oriented approach with strong communication, an entrepreneurial mindset, and a focus on clean code, accessibility, and measurable product impact. I seek opportunities to solve complex frontend challenges and help teams ship reliable, high-performing experiences.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

Planetary

Apr 2022 - Present (4 years 2 months)

Led frontend development and performance architecture for high-traffic Next.js applications, reducing page load times by 25% and improving Lighthouse scores by 30+ points while delivering CMS-driven, multi-region sites for enterprise clients.

React Next.js TypeScript REST APIs Performance Optimization Sanity CMS Accessibility

Senior Frontend Engineer

Agility Creative

Mar 2018 - Mar 2022 (4 years)

Led frontend projects for B2B SaaS and product teams, increasing organic traffic by 22%, improving Lighthouse scores to 90+, and delivering features that drove 10,000 signups and ~10% conversion in launch month.

React TypeScript Storybook SEO Performance Jest REST APIs Responsive Design Component Libraries

Frontend Engineer

Deonibus

Mar 2018 - Jul 2021 (3 years 4 months)

Migrated a legacy e-commerce frontend to React with SSR and caching, cutting page load time by 60%, increasing conversion by 30%, and recovering ~5% lost orders via a Node.js retry bot.

React Webpack Context API Redis Node REST APIs Performance Optimization