Senior Full Stack Engineer

I design and build end-to-end products — from pixel-perfect interfaces and fluid motion to resilient backends and cloud infrastructure. Obsessed with detail, performance and the craft of great software.
William Elesbão

A little about me

About

I'm a Senior Full Stack Engineer with a product mindset. I care as much about the architecture behind a feature as I do about how it feels in the user's hands.

My work spans the whole stack — crafting refined frontends with React and Next.js, building robust backends with Node.js and GraphQL, shipping cross-platform mobile apps with React Native, and designing the systems that hold it all together.

Above all, I sweat the details: motion, accessibility, performance and the small interactions that make a product feel premium.

0+Years of Experience
0+Projects Delivered
Cups of Coffee

Tools I Reach For Every Day

The technologies I trust to ship fast, reliable and delightful products.

TypeScript
React
Next.js
Tailwind
React Query
Storybook
React Native
Expo
Bun
Turborepo
Node.js
NestJS
Elysia.jsElysiaJS
GraphQL
BullMQ
Better Auth
Stripe
Pusher
PostgreSQL
Redis
Prisma
Drizzle
TypeORM
AWS
Google Cloud
Firebase
Vercel
Docker
Git
Github
Github Actions
Drone
Jest
Vitest
PlaywrightPlaywright
SonarQube
SigNozSigNoz
PostHog

A Few Places I've Built Things

Teams and products I've helped grow over the years.

Mar 2025Present

Deggex

Senior Mobile / Frontend Engineer

Led mobile architecture for a cross-platform React Native and Expo application, defining and documenting frontend standards and driving the migration from Atomic Design to a Feature-Based Architecture to resolve maintainability and scalability issues. Owned feature parity and stability across iOS and Android, implemented Expo OTA updates that cut deployment costs by 34% and removed weekly build bottlenecks, integrated PostHog for analytics and error tracking, and established type-safe API integration via HeyAPI/OpenAPI codegen. Designed CI/CD pipelines for automated build validation and EAS-based deployment, and managed third-party integrations (Google/Apple Calendar and Maps) in close collaboration with backend and design teams.

Aug 2024Feb 2025

Ivve.Tech

Full-Stack Developer

Owned end-to-end full-stack delivery of two production products: the Ionic Partners institutional website (Next.js, React, Tailwind, Builder.io with Figma-to-code integration, Framer Motion, Resend) and VerseMate, an open-source AI-assisted Bible reading platform. For VerseMate, designed the PostgreSQL data model, built a modular and scalable backend with Elysia/Bun, implemented secure JWT authentication, and integrated the ChatGPT API to power AI-generated translations and verse explanations — taking the MVP from architecture decisions through to a working open-source product.

Dec 2021Mar 2025

TMSA

Full-Stack Developer

Over three-plus years, designed and built enterprise-grade web platforms using Next.js (SSR/SSG) on the frontend and modular NestJS services on the backend, implementing REST and GraphQL APIs with token-based authentication and documenting/testing them with Jest and Swagger. Led system integrations across Senior ERP, Microsoft Azure, and SoftExpert, and developed and integrated IoT platforms. Analyzed business processes to design BPMN workflows and forms in SoftExpert, applied Clean Architecture and SOLID principles to keep a long-lived codebase maintainable, and ensured quality through unit, integration, and end-to-end testing.

Projects I've Loved Building

A selection of products and experiments I'm proud of.

C.I.O.S

C.I.O.S (Check-In / Check-Out System) is an internal IT asset management platform built for TMSA to track the full lifecycle of company equipment. It features Microsoft SSO authentication, configurable check-in/check-out reasons and equipment registries, role-based permissions (Technician/Administrator), automated record creation with email notifications, and a dashboard providing real-time visibility into equipment status (new, used, decommissioned) and movement history.

Next.jsTypeScriptNestJSNode.jsMicrosoft SQL ServerPrismaAzure ADTailwindShadcn/uiMotionReact QueryAxiosDayjsNodemailerESLintPrettier

VerseMate

VerseMate is a free, nonprofit Bible platform that helps people understand Scripture through AI-generated summaries, line-by-line commentary, and in-depth theological analysis across multiple Bible versions and languages. Originally launched as an open-source MVP focused on Genesis and Matthew, it was built with a scalable Elysia/Bun backend, PostgreSQL database, secure JWT authentication, and ChatGPT API integration for AI-assisted translations and verse explanations.

Next.jsReactTypeScriptElysiaJSBunPostgreSQLPrismaKyselyRedisCSS ModulesReact QueryAxiosDockerCI/CDBiomeLadleFaker.js

Ionic Partners

Institutional website for Ionic Partners, a software-focused investment and growth equity firm based in Austin, TX, presenting their investment approach, portfolio companies, and team. Built end-to-end with Next.js, React, and Tailwind CSS, using Builder.io's Figma-to-code workflow to translate designs into production components, Framer Motion for animations, and Resend for contact form delivery — fully responsive across devices.

Next.jsReactTypeScriptBuilder.ioBunReact QueryResendReact EmailGoogle ReCaptchaBiome

Leko

Leko is the first social network for athletes, local communities, coaches, beginners and professionals. The mobile app will help you find best training partners and provide you with the necessary tools to achieve results.

React NativeExpoTypeScriptJotaiReact QueryHeyAPIpusher-jsGoogle MapsGoogle Calendari18nextDayjsFeature Based ArchitectureAtomic DesignStorybookJestBunDockerRedisCI/CDBiomeSigNozPostHog

EVO

EVO Software Engineering is the portfolio and institutional website for a software development studio offering end-to-end engineering services — mobile, web, DevOps, and technical consulting, from concept to deployment. The site showcases the studio's service offerings, tech stack, project delivery workflow, and a portfolio featuring shipped products such as Leko, Ionic Partners, VerseMate, and C.I.O.S. Built with Next.js, React, TypeScript, and Tailwind CSS.

Next.jsReactTypeScriptBunTailwindCSSShadcn/uiMotionReact QueryZodt3-ossnext-intlResendReact EmailGoogle ReCaptchaVitestCI/CDBiome

Let's Build Something

Have a product in mind, a role to fill, or just want to talk shop? My inbox is always open — I'll get back to you as soon as I can.

william.elesbao.2000@gmail.com