Eduardo da Silva Kegler
Verified Expert in Engineering
JavaScript Developer
Florianópolis - State of Santa Catarina, Brazil
Toptal member since December 7, 2021
Eduardo is a senior front-end engineer with 7+ years focused on fintech products. At Coinbase, he owned the auth and onboarding flows for 200,000+ users, boosting signup conversion by 35% and reducing load times by 20%. At GTE, he was the only front-end engineer and built five trading interfaces from scratch in 10 months. Eduardo's main stack is React, TypeScript, and Next.js, and he knows auth systems (OAuth and OIDC) and real-time UIs really well.
Portfolio
Experience
- Git - 7 years
- JavaScript - 7 years
- TypeScript - 6 years
- React - 6 years
- GraphQL - 5 years
- Node.js - 5 years
- OAuth - 3 years
- Next.js - 3 years
Preferred Environment
Git, GitHub, Vercel
The most amazing...
...thing I've built is GTE's trading platform. I was the only front-end developer and shipped five trading interfaces from scratch in 10 months.
Work Experience
Senior Front-end Engineer
Liquid Labs
- Worked as the only front-end engineer on the team. Built the entire platform from zero to testnet in 10 months, covering five trading surfaces: AMM, orderbook, perpetuals, token launchpad, and portfolio.
- Set up the component architecture and shared UI patterns so the team could ship new features fast without needing more front-end developers.
- Handled all the wallet connectivity, auth, and session flows using Privy and Viem so users could sign in and execute transactions securely.
- Built real-time user interfaces for portfolio balances, PnL, open positions, and order execution. Focused on maintaining responsiveness and clarity when handling latency-sensitive data.
Senior Software Engineer
Coinbase
- Owned authentication and onboarding flows for 200,000+ users, including OAuth-based sign-in with Apple, Google, and Ethereum wallets.
- Led Unified Signup 2.0, redesigning the sign-in and sign-up experience across Apple and Google and increasing signup conversion by 35%.
- Optimized front-end performance on key auth flows, cutting load times by 20%.
- Built and shipped the App Switcher across Coinbase Help Center, Tracer, and Commerce, improving cross-product navigation for retail web users.
- Drove 20+ initiatives end to end, from implementation and code reviews to rollout coordination and monitoring.
Software Engineer
Tech6
- Built and maintained a real estate platform used by 3,000+ users with React, TypeScript, and GraphQL.
- Designed and built an internal design system that brought UI consistency across three different platforms.
- Built an automated invoice generation system that improved operational efficiency by 30%.
Software Engineer
Todobit Sistemas
- Developed and maintained work safety software using JavaScript and PHP (Laravel) to improve system reliability for third-party clients.
- Optimized legacy code, reducing system crashes and improving response times by 14%.
- Collaborated with cross-functional teams to implement new features and enhancements for the software.
Experience
Real Estate Web Application
https://www.fathomrealty.com/The back end was developed using C# and Postgres and front end using React, TypeScript, and Antd.
GTE Trading Platform
http://www.gte.xyzCoinbase
• Shipped OAuth sign-in with Apple, Google, and Ethereum Wallet for 200,000+ users.
• Led Unified Signup 2.0, which got a 35% lift in signup conversion and 20% faster load times.
Also built the App Switcher used across Help Center, Tracer, and Commerce.
Education
Bachelor's Degree in Computer Science
University of the Itajaí Valley (Univali) - Itajai, Santa Catarina, Brazil
Skills
Libraries/APIs
React, Antd, Node.js, REST APIs, React Testing Library, React Hook Form, WebGL, Wagmi
Tools
Git, GitHub, Webpack, Shadcn, Claude Code, Claude
Languages
TypeScript, HTML, CSS, JavaScript, GraphQL, Python, Sass, PHP, SQL, C#
Frameworks
Redux, Next.js, Tailwind CSS, Jest, Cypress, Material UI, React Native, Angular, Express.js
Paradigms
Agile Software Development, REST API Architecture, REST, Object-oriented Programming (OOP), Microfrontends, Model Context Protocol (MCP)
Platforms
Docker, Amazon Web Services (AWS), Contentful, Azure, Vercel
Storage
MySQL, Databases
Other
Front-end, Front-end Development, OAuth, Authentication, Finance, Pixel Perfect, User Experience (UX), User Interface (UI), Server-side Rendering (SSR), APIs, Architecture, Design Systems, Front-end Architecture, Storybook, UI Components, Full-stack, Web3, Monorepos, OpenID Connect (OIDC), CI/CD Pipelines, GitHub Actions, Core Web Vitals, Fintech, Performance Optimization, Supabase, Single Sign-on (SSO), Agentic AI, Generative Artificial Intelligence (GenAI), Minimum Viable Product (MVP), Prompt Engineering, Product Management, Rive, Web Content Accessibility Guidelines (WCAG), Artificial Intelligence (AI), Cursor AI, OpenAI, AI Tools, Viem, Privy, Decentralized Finance (DeFi)
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