Leandro Gonzalez

Leandro Gonzalez

Software Engineer

Valencia, Spain · Remote

Software Engineer with 5+ years of experience building fullstack, mobile, and backend products. Specialized in cross-platform mobile development (React Native/Expo), modern web stacks (React, Next.js), and scalable architectures. CEO of Kilnny. Shipped products to the App Store and Google Play.

Experience

From mobile engineering to leading backend and e-commerce teams, across companies and international remote work.

Frontend Developer & Mobile Engineer

Dec 2025 – Jul 2026

Informage Studios · Valencia, Spain · Remote

Stack: React, Next.js, Chrome Extension, Electron + TS + Vite, FastAPI, Expo React Native, NFC (Android & iOS), LLM integration

  • Developed Fivo AI — a fullstack AI web platform with Next.js and FastAPI backend, integrating LLM models for intelligent user workflows.
  • Built and published the Fivo AI Chrome Extension to the Chrome Web Store for in-browser AI capabilities.
  • Created a cross-platform desktop app using Electron + TypeScript + Vite.
  • Developed Keonex: cross-platform mobile app for ESL label management — NFC read/write on Android & iOS, EAN barcode scanning, full auth flow, label assignment/editing, and complex multi-capability searches. Published to App Store and Google Play.

CEO & Co-Founder

2024 – Present

Kilnny · Beta App Distribution Platform

Stack: React Native (Expo + EAS), Next.js, NestJS, Node.js, Prisma, PostgreSQL, Supabase, AWS, GitHub Actions, Render, Vercel CLI

  • Built and lead Kilnny, an Android beta app distribution platform that lets developers share and test APK builds with their community.
  • Implemented CI/CD with EAS and GitHub Actions for automated builds, JWT auth with role-based access for developers, and S3-compatible cloud storage for APK files.
  • Added AI-powered tester feedback analysis: deep summaries and actionable task lists generated automatically for dev teams.
  • Built Kilnny CLI with Node.js to manage app distribution and releases from the terminal.

Fullstack Developer & E-Commerce Lead

2024 – 2025

Tecopos

Stack: GraphQL, gRPC, Kafka, Elasticsearch, Prisma, React.js

  • Promoted from Mobile Developer to E-Commerce department head.
  • Designed multicurrency payment gateway (Stripe/Tropipay adapters), optimized search latency by 40% with Elasticsearch, led monolith-to-microservices migration with Kafka.

Lead Backend Developer

2022 – 2023

PhylluCI · Bioinformatics

Stack: Python (Django), multithreading, async workers

  • Genetic analysis platform with 3D protein visualization, subprocess pipeline for sequence alignment, and dynamic project history tracking.

Featured Projects

A selection of products I've built for companies and clients.

Keonex ● Live

Keonex

company

Cross-platform mobile app for ESL label management with NFC and barcode scanning, published to the App Store and Google Play.

  • NFC read/write on Android & iOS and EAN barcode scanning.
  • Full auth flow, label assignment/editing, and complex multi-capability searches.
  • Published to the App Store and Google Play.
React Native (Expo) NFC (Android & iOS) TypeScript
Fivo AI ● Live

Fivo AI

company

Fullstack AI web platform with an in-browser Chrome extension and a cross-platform desktop app.

  • Next.js frontend with FastAPI backend integrating LLM models for intelligent user workflows.
  • Chrome Extension published to the Chrome Web Store.
  • Cross-platform desktop app built with Electron + TypeScript + Vite.
Next.js FastAPI LLM Integration Chrome Extension
Del Sol Reports ● Live

Del Sol Reports

freelance

Mobile app for a US contractor covering dumpster rental, gravel sales, and home repair.

  • Full invoice/estimate generation and container & gravel ticket management.
  • Fuel cost tracking with exports.
  • Database backups to iCloud/Google Drive.
Expo React Native SQLite3
Yasper Trader ● Live

Yasper Trader

freelance

Platform for a trading mentor with Stripe subscription management and Telegram bot distribution.

  • Subscription management via Stripe.
  • Telegram bot for community notifications and signal distribution.
Next.js Stripe Telegram Bot
Havana Restaurant ● Live

Havana Restaurant

freelance

Web app for a bar-restaurant in Arcata, CA with a real-time admin panel.

  • Client-facing site with a full admin panel to create, edit, and delete every element.
  • Manage menu, sections, photos, and promotions in real time.
Next.js Supabase NestJS

About Me

Software Engineer with 5+ years of experience building fullstack, mobile, and backend products. Specialized in cross-platform mobile development (React Native/Expo), modern web stacks (React, Next.js), and scalable architectures. CEO of Kilnny (an Android beta app distribution platform with AI-powered feedback analysis). Experienced shipping products to App Store and Google Play and working with international remote teams.

Education

Computer Science Engineering

University of Computer Sciences of Cuba (UCI)

Fac. Computational Sciences & Technologies

Nov 2020 – Nov 2024

Languages

  • Spanish (Native)
  • English (Professional)

Soft Skills

Involved Communication Problem Solving Creativity Team Collaboration

Skills & Tools

React React Native (Expo) Next.js TypeScript JavaScript Node.js Electron NestJS FastAPI Python GraphQL gRPC Kafka Elasticsearch Prisma PostgreSQL SQLite Supabase AWS Render Vercel CLI GitHub Actions Docker Stripe NFC (Android/iOS) LLM Integration Tailwind CSS Git

Let's Connect

Open to freelance projects, collaborations, and full-time opportunities. Feel free to reach out.