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Williams Mejias

@williamsmejias

Full-Stack Engineer building React and TypeScript apps, including FitScore's Firebase backend and payments integrations.

Venezuela

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At AgecticDream / Daylight Transport, I built and maintained production logistics features in React and TypeScript, and wrote Playwright and Cypress end-to-end tests. I also applied AI agents and spec-driven development to codebase analysis, implementation, and test development.

As a freelance developer, I built Frame It's TypeScript monorepo with a Fastify API, PostgreSQL/Prisma, and Next.js apps. I also implemented FitScore's Firebase backend with Stripe and PayPal integrations, and developed React and React Native applications for Cultos and Icterus Tech.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full-Stack Developer

Current

Self Employed

Jan 2022 - Present (4 years 9 months)

Developed multiple freelance projects including a TypeScript monorepo with PostgreSQL/Prisma, a Fastify API, and Next.js apps; a backend on Cloud Functions with Express and a React Native app; and a backend on Firebase Cloud Functions with Stripe/PayPal and SendGrid integrations.

TypeScript PostgreSQL Prisma Fastify Express Next.js Docker Cloud Functions React Vite React Native Expo Firebase Firestore Stripe PayPal Sendgrid Jest Firebase Emulator Suite

Senior Frontend Developer

AgecticDream / Daylight Transport

Jan 2024 - Aug 2026 (2 years 7 months)

Built and maintained production features in React and TypeScript for a logistics client, using Ant Design/MUI and drag-and-drop interfaces. Applied AI agents and spec-driven development to support codebase analysis, implementation and test development.

React TypeScript Ant Design MUI Playwright Cypress Jira Confluence AI Agents Spec Driven Development

Frontend Developer

Cultos

Oct 2022 - Sep 2023 (11 months)

Developed React and React Native applications in TypeScript, with Ionic for cross-platform delivery. Integrated GraphQL APIs and built forms with Zod and React Hook Form, styled with Tailwind.

React React Native TypeScript Ionic GraphQL Zod React Hook Form Tailwind Cypress Playwright

Frontend Developer

Icterus Tech

Jun 2017 - Oct 2022 (5 years 4 months)

Delivered React, React Native and Ionic applications in TypeScript over five years. Integrated GraphQL services and built Shopify/Liquid storefront functionality.