Eduardo is available for hire

Eduardo da Silva Kegler

Verified Expert in Engineering

OAuth Developer

Florianópolis - State of Santa Catarina, Brazil

Toptal member since December 7, 2021

Expertise

Front End System Security Git CSS JavaScript API GitHub React.js TypeScript REST API Node.js Redux GraphQL Agile Development Next.js

Bio

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

Liquid Labs

React, TypeScript, Next.js, Viem, Privy, Wagmi, Web3, Tailwind CSS, Monorepos...

Coinbase

React, TypeScript, Git, React Native, Agile Software Development, JavaScript...

Tech6

React, TypeScript, Python, C#, Git, Azure, Antd, CSS, HTML, JavaScript...

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

2025 - 2026

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.

Technologies: React, TypeScript, Next.js, Viem, Privy, Wagmi, Web3, Tailwind CSS, Monorepos, Git, React Native, Webpack, REST APIs, REST API Architecture, Jest, Cypress, CI/CD Pipelines, GitHub Actions, Core Web Vitals, Decentralized Finance (DeFi), Fintech, Authentication, Performance Optimization, Vercel, GitHub, Finance, Pixel Perfect, User Interface (UI), Shadcn, React Testing Library, Supabase, React Hook Form, Server-side Rendering (SSR), Amazon Web Services (AWS), APIs, REST, Architecture, Design Systems, Front-end Architecture, Agentic AI, Generative Artificial Intelligence (GenAI), Minimum Viable Product (MVP), Prompt Engineering, Product Management, WebGL, Storybook, UI Components, Artificial Intelligence (AI), Claude Code, Cursor AI, Claude, Model Context Protocol (MCP), OpenAI, AI Tools

Senior Software Engineer

2021 - 2025

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.

Technologies: React, TypeScript, Git, React Native, Agile Software Development, JavaScript, HTML, CSS, REST API Architecture, GraphQL, Front-end, REST APIs, Front-end Development, OAuth, Monorepos, Tailwind CSS, Webpack, Next.js, Jest, OpenID Connect (OIDC), Core Web Vitals, Decentralized Finance (DeFi), Fintech, Authentication, GitHub, Finance, Pixel Perfect, User Experience (UX), User Interface (UI), React Testing Library, Single Sign-on (SSO), Server-side Rendering (SSR), APIs, REST, Architecture, Design Systems, Front-end Architecture, Microfrontends, Contentful, Web Content Accessibility Guidelines (WCAG), Storybook, UI Components, Artificial Intelligence (AI), Cursor AI, Model Context Protocol (MCP), OpenAI, AI Tools

Software Engineer

2019 - 2021

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%.

Technologies: React, TypeScript, Python, C#, Git, Azure, Antd, CSS, HTML, JavaScript, Agile Software Development, Sass, Redux, Node.js, Webpack, OAuth, GraphQL, REST APIs, REST API Architecture, Full-stack, Jest, Cypress, CI/CD Pipelines, Performance Optimization, GitHub, Tailwind CSS, Pixel Perfect, User Interface (UI), React Testing Library, Material UI, Amazon Web Services (AWS), APIs, REST, SQL, Design Systems, Front-end Architecture, Minimum Viable Product (MVP), Databases, UI Components

Software Engineer

2018 - 2019

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.

Technologies: PHP, JavaScript, Angular, Git, CSS, HTML, Node.js, MySQL, Front-end, Python, REST APIs, REST API Architecture, Full-stack, GitHub, User Interface (UI), Docker, APIs, REST, SQL, Front-end Architecture, Databases

Experience

Real Estate Web Application

https://www.fathomrealty.com/

A React-based web application developed for the real estate agents to create and finish transactions and register and associate contacts.

The back end was developed using C# and Postgres and front end using React, TypeScript, and Antd.

GTE Trading Platform

http://www.gte.xyz

I built the entire front end for a DeFi trading platform as the only front-end engineer. The platform has five trading surfaces: AMM, orderbook (CLOB), perpetuals, token launchpad, and portfolio tracking. Everything was built from scratch with React, TypeScript, Next.js, and Web3 wallet integration (Privy, Viem, and Wagmi). It went from zero to testnet in 10 months.

Coinbase

• Owned the auth and onboarding flows for Coinbase's retail web products.
• 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

2017 - 2021

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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