Full-Stack- & Mobile-Entwickler

Hallo, ich bin Gregory

Ich entwickle leistungsstarke Web- und Mobile-Anwendungen und beschleunige meinen Arbeitsablauf mit KI-Tools, um schneller und in höherer Qualität zu liefern.

Upwork
Gregory Oviedo, frontend developer
05+Jahre Erfahrung

Über mich

Meine Vorstellung
Gregory Oviedo's workspace

Ich bin Full-Stack-Entwickler mit über 5 Jahren Erfahrung in der End-to-End-Entwicklung von Web- und Mobile-Anwendungen. Ich bin sowohl im Frontend als auch im Backend zu Hause und entwickle außerdem plattformübergreifende mobile Apps. Ich habe Werkzeuge der Künstlichen Intelligenz in meinen Arbeitsablauf integriert, wodurch ich schneller entwickeln, wiederkehrende Aufgaben automatisieren und Lösungen in höherer Qualität liefern kann. Ich zeichne mich durch Verantwortungsbewusstsein, Pünktlichkeit, Effizienz beim Lösen von Problemen und gute Arbeitsweisen aus und passe mich problemlos an unterschiedliche Projekte und Umgebungen an.

05+
Jahre Erfahrung
10+
Abgeschlossene Projekte
03+
Unternehmen tätig
Lebenslauf herunterladen

Fähigkeiten

Mein technisches Niveau
Frontend
  • HtmlHtml
  • CssCss
  • JavaScriptJavaScript
  • TypeScriptTypeScript
  • ReactReact
  • Next.jsNext.js
  • AstroAstro
Mobile
  • React NativeReact Native
  • ExpoExpo
UI / Styling
  • TailwindTailwind
  • Chakra UIChakra UI
  • SassSass
Backend / API
  • NodeNode
  • ExpressExpress
  • NestJSNestJS
  • GolangGolang
  • PythonPython
  • PhpPhp
Databases
  • MySqlMySql
  • PostgreSQLPostgreSQL
  • MongoDBMongoDB
Testing
  • CypressCypress
  • VitestVitest
Infrastructure
  • DockerDocker
  • FirebaseFirebase
  • SupabaseSupabase
  • VercelVercel
  • RailwayRailway
  • GitGit
  • GitHub ActionsGitHub Actions
  • BashBash
AI Tools
  • Claude CodeClaude Code
  • OpenCodeOpenCode

Qualifikation

Mein persönlicher Werdegang
  1. Frontend-Entwickler (Junior)

    Kunaifost
    2021 - 2022
  2. FullStack-Entwickler (Semi-Senior)

    Jam Tech
    2022 - 2025
  3. Frontend-Entwickler (Senior)

    iNuba
    2026 - 2026

Leistungen

Was ich anbiete

Frontend- Entwickler

Backend- Entwickler

Mobile- Entwickler

FAQ

Quick answers about my services, stack and process

What services do you offer as a developer?

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).

What is your main technology stack?

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.

Do you develop native or cross-platform mobile apps?

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.

How does your development process work?

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.

How do you use AI in your workflow?

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.

How do you structure your rates and availability?

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.

Portfolio

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