こんにちは、Gregoryです

I offer three core services: Frontend Development (modern, fast, accessible web interfaces built with React, Next.js, Astro, and Tailwind CSS), Backend Development (REST and GraphQL APIs with Node.js, NestJS, and Go, plus database modeling and secure authentication), and Mobile Development (cross-platform iOS and Android apps with React Native and Expo, including App Store / Google Play deployment and OTA updates).

My main stack covers React, Next.js, Astro and TypeScript on the frontend; Node.js, NestJS, Express and Go on the backend; PostgreSQL, MongoDB and Supabase for data; React Native and Expo for mobile; plus Docker, GitHub Actions, Vercel and Railway for cloud and DevOps. I also integrate AI tools like Claude Code and the OpenAI API into the development workflow to ship faster and with higher quality.

I build cross-platform mobile applications with React Native and Expo, which means a single codebase ships to both iOS and Android with a near-native feel. When a project requires it, I also write native modules in Kotlin for Android. I handle the full lifecycle: UI, business logic, push notifications, offline-first sync, store deployment, and over-the-air updates with Expo EAS.

I start with a short discovery call to align scope, success metrics and constraints. Then I move to a technical design, break the work into milestones and ship in short iterations with weekly demos. Communication happens in your preferred channel (Slack, email or calls), and every milestone ends with code you can review, test and deploy.

I integrate AI assistants like Claude Code and OpenCode directly into the development loop: generating boilerplate, writing and refactoring tests, accelerating documentation, and reviewing code for accessibility and performance issues. I also build AI features into products when it makes sense — for example, integrating the OpenAI API for smart assistants, automated content or biometric analysis.

I work on a fixed-price or hourly basis depending on the project. Short scopes and audits are usually fixed-price; ongoing product work is typically hourly or monthly. I am currently open to freelance and contract work and respond to every inquiry within 24 hours — write to gregoryoviedo.dev@gmail.com or send a message through the contact form.