I work building high-performance web experiences at scale for 12+ years with experience in fintech, travel tech, e-commerces and SaaS.
Let's build something great together!
I'm Renan Martins, a Senior Frontend Engineer based in Ceará, Brazil, working remotely with teams worldwide. I specialize in building high-performance web applications using React, TypeScript, and Next.js.
With 12+ years of experience across fintech, travel tech, and food e-commerce, I've consistently delivered measurable results: reducing page load times by up to 60%, increasing conversion rates by 30%, and achieving 90+ Lighthouse scores across hundreds of pages.
Currently at Planetary, I lead frontend development for large-scale digital products serving clients like California Pizza Kitchen, Din Tai Fung, and The Wall Street Journal.
A selection of projects that showcase my skills and experience
Built a multi-language, multi-region restaurant website with geo-redirects and ISR caching, cutting infrastructure costs by 35% and boosting Lighthouse from 60 to 90+.
Optimized a high-traffic food e-commerce platform serving 400k+ monthly users, reducing page load by 25%, increasing catering revenue by 10%, and boosting accessibility from 40 to 90.
Migrated a high-traffic travel tech e-commerce platform from legacy JS to React with SSR, reducing page load time by 60% and increasing conversion rates by 30%.
Developed a high-performance B2C fashion app with an AI-powered style-discovery feature, achieving 90+ Lighthouse scores and driving 10,000 signups with ~10% conversion.
Led frontend development of 30+ growth experiments on a SaaS platform, driving measurable improvements in conversion, upsell, and user engagement.
Products I'm building from the ground up
Discover places through people you trust
A social platform where you discover restaurants, cafes, and bars through friend recommendations. No fake reviews, just real picks from real people.
Your Home, Finally Organized
Household management SaaS that replaces group chats and sticky notes with a single place for items, routines, reminders, and urgent problems.
More Keywords
Clean Architecture, Agile (Scrum/Kanban), Code Review, Performance Optimization, Accessibility (WCAG), A/B Testing, Technical Documentation, Mentoring
Described as proactive, a fast learner, and effective collaborator
“Renan is one of the most valuable people I've ever worked with, his knowledge in software development is vast and extensive. He is a reference for me in Front-end development. He consistently provides valuable inputs and ideas that improve team results.”
Paulo Henrique
Software Developer at DeÔnibus
“Do I recommend Renan? Of course! Focused on individual and collective goals, dedicated to always delivering the best results. There is no unreachable challenge or difficulty that Renan cannot see as a great opportunity. Working with him was a pleasure.”
Wolp Farias
CX Analyst at Mobills Labs
“I recommend Renan for his integrity, dedication, and leadership ability. He was fundamental to my professional and personal growth, one of the people who most inspired me. His long-term vision and relentless drive to solve any challenge stand out the most.”
Yago Sampaio
IT Business Analyst II at Mobills Labs
Whether you're looking for a frontend engineer to join your team, need consulting on a project, or want to collaborate on something exciting, I'd love to hear from you.
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