Open to opportunities

igor moreno semedo

@igormorenosemedo

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Senior Front-end / Full-Stack Engineer specializing in React, TypeScript, and high-traffic web apps.

France

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What I'm looking for

I seek remote-friendly roles where I can lead frontend or full-stack development, optimize performance, and build secure, scalable products for large user bases.

I am a Senior Software Engineer with over 10 years building high-traffic web applications and secure fintech solutions, specializing in Modern JavaScript, React, Node.js, and TypeScript. I focus on performance optimization, complex state management, and secure API integrations for global products serving millions of users.

Throughout my career I've led frontend and full-stack efforts at startups and large organizations, architected and launched my own product, and contributed to major projects such as MetaMask integrations and high-volume marketplaces. I deliver end-to-end features from UI design through deployment, and I prioritize reliable, performant user experiences.

I thrive in cross-functional, remote settings and enjoy improving developer workflows through CI/CD and robust testing. I'm motivated by shipping impactful products, reducing operational costs, and scaling platforms to handle large user bases.

Experience

Work history, roles, and key accomplishments

Current

Founder & Full-stack Engineer

Current

OneLink

Jan 2025 - Present (1 year 1 month)

Architected and launched onlnk.io, a link aggregation platform; built a performant full-stack application using React, TypeScript and Supabase and managed end-to-end product lifecycle from UI design to deployment.

React TypeScript Supabase Full Stack UI Design Deployment Performance Optimization

Senior Front-end Engineer

Cometh

Jan 2024 - Dec 2024 (11 months)

Engineered the frontend for a high-traffic gaming platform for the French National Lottery, optimized API payloads to reduce load times, and implemented complex UI animations and interactive dashboards.

React JavaScript Performance Optimization API Design Animation Dashboard Development Frontend Architecture

Full-stack Engineer

Consensys

Aug 2021 - Jan 2024 (2 years 5 months)

Contributed to MetaMask and multiple enterprise blockchain projects, led a Mastercard payment card PoC enabling crypto-to-fiat payments, integrated Ledger hardware wallet support, and improved application performance across repositories.

React Blockchain Blockchain Integrations Performance Tuning API Development DApp Maintenance

Front-end Engineer

Few and Far

Mar 2022 - Jan 2023 (10 months)

Developed a high-volume Digital Asset Marketplace with reusable React components for real-time dashboards and transaction history; platform scaled to 15,000 active users and supported a successful Series A.

React Dashboards Scalability

Front-end Engineer

Ubiplace

Aug 2020 - Oct 2021 (1 year 2 months)

Engineered the Observation Identification module for SmartVigie, a B2B urban monitoring SaaS, optimizing user workflows for identifying actionable data and securing a repeat freelance engagement.

React SaaS Development Data Visualization Frontend Engineering B2B

Blockchain SME & Consultant

Accenture

Jan 2016 - Aug 2021 (5 years 7 months)

Led technical implementation for digital transformation projects in finance, logistics and insurance; developed a connected home IoT platform for risk assessment and built a Node.js integration platform with chatbot capabilities.

Blockchain IoT Node Digital Transformation Chatbot