Pablo Gastelum

Hi, I’m Pablo GastelumFullstackEngineer

I join your team or lead the whole project, and make sure the app is fast, stable and reaches production.

View my résuméEmail me

6+years of experienceAPI · web · mobile app

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Introduction

Six years shipping web and mobile apps to production

I write the code and, when the project needs it, lead the team writing it.

I’ve built real-time order tracking apps, loyalty programs with location-based coupons, payments that keep working offline, and storefronts that load fast and rank in search.

  • High performance

    API caching, GraphQL without repeat requests and SSR so the app and the site respond fast.

  • End-to-end product

    I design the API, build the web and mobile apps, and ship them to the App Store and Google Play.

  • Technical leadership

    I’ve led up to four teams at once: architecture, code reviews and CI/CD.

  • Applied AI

    I use AI inside the product and in my development workflow to ship faster.

If you’re hiring for your team or need someone to build your app, email me.

Experience

From enterprise ERPs in 2019 to loyalty, payments and retail apps today.

Roomie IT

Fullstack Developer

2025 — now

Retail: order tracking, e-commerce and AI-driven promotions.

  • Lead mobile development of real-time order tracking apps in React Native.
  • Build e-commerce platforms with Next.js and React, using SSR and optimized routing for performance, SEO and conversion.
  • Design APIs and microservices with Node.js and .NET Core, prioritizing security, modularity and scalability.
  • Shipped AI that generates, personalizes and publishes the monthly promotions across e-commerce and mobile.
  • React Native
  • Next.js
  • Node.js
  • .NET Core
  • AI

Spin Premia

Mobile Developer

2023 — 2025

Loyalty and digital coupons app.

  • HTTP API caching with TanStack Query: about 30% better performance and load times.
  • GraphQL with Apollo Client for complex coupon queries, cached to avoid repeat requests.
  • Coupons matched to the user’s state, region and device location.
  • Reorganized state and modules to cut re-renders and make the app easier to change.
  • React Native
  • TanStack Query
  • GraphQL
  • Apollo

Interaxis

Tech Lead & Fullstack Developer

2022 — 2023

Technical lead for four teams of 3 to 5 people.

  • Led architecture and development for four teams in parallel, writing code on all of them.
  • Defined GraphQL integrations on web and mobile: queries, mutations, caching and error handling.
  • Standardized pull requests, code reviews and CI/CD, with Bitrise pipelines to the App Store and Google Play.
  • Coordinated the move of repositories to GitHub and of services from Azure to AWS.
  • GraphQL
  • Bitrise
  • GitHub Actions
  • AWS
  • Azure

Pagaloop

Mobile Developer

2022

Payments and transfers app.

  • Payments app in React Native with native iOS and Android code for critical flows.
  • Cached GraphQL to keep banking data in sync on spotty connections.
  • Real-time support chat with Twilio and an offline-first architecture.
  • React Native
  • Swift
  • Kotlin
  • Twilio
  • GraphQL

Equipesca

Fullstack Developer

2021 — 2022

CRM and logistics.

  • Frontend and backend for a CRM serving customers and internal operations.
  • Delivery routing with the Google Maps API to shorten routes, times and costs.
  • React
  • Node.js
  • Google Maps API
  • SQL

Interaxis

Fullstack Developer

2019 — 2021

Enterprise ERP systems.

  • Features in React and .NET for corporate clients’ ERP systems.
  • Internal check-in app with geolocation and real-time Google Maps tracking.
  • React
  • .NET
  • React Native
  • SQL Server

Applied AI

I use it inside the product and in how I work.

In the product

Promotions generated with AI

I built an AI workflow that generates, personalizes and publishes the monthly promotions for an online store and its app. The commercial team ships them faster and with less manual work.

In my workflow

Claude Code, Codex, Cursor and Kimi every day

I use them to design, refactor and document in the same cycle I ship the code.

Stack

What I’ve used in production.

Frontend

  • React
  • Next.js
  • Angular
  • TypeScript
  • Apollo Client

Mobile

  • React Native
  • Expo
  • Swift
  • Kotlin
  • Flutter
  • Zustand
  • TanStack Query

Backend

  • Node.js
  • NestJS
  • ASP.NET Core
  • C#
  • Java
  • Spring Boot
  • REST
  • GraphQL

Data

  • SQL
  • MySQL
  • MongoDB
  • Firebase
  • Entity Framework

Cloud & DevOps

  • AWS
  • Azure DevOps
  • Docker
  • Kubernetes
  • GitHub Actions
  • Bitrise

AI

  • Claude Code
  • OpenAI Codex
  • Cursor
  • Kimi
  • Mintlify

Hiring, or have a project?

I work from Cd. Obregón, Sonora (UTC−7), on the same clock as Arizona. Send me the role or the project and let’s talk.

[email protected]