Leandro González Espinosa class="w-40 h-40 hover:border-[#EC5700] rounded-full overflow-hidden border-2 border-[#5b5958]"> Leandro González Espinosa

Software Engineer & Full Stack Developer

Software Engineer with 4+ years of experience leading fullstack, mobile, and backend projects. Specialized in scalable architectures and modern technologies. Passionate about solving complex problems with innovative technical solutions.

Who is Leo? View Projects

Experience

  • Professional Experience

    Since 2020

    Software Engineer with 4+ years of experience leading fullstack, mobile, and backend projects. Specialized in scalable architectures (microservices, REST/GraphQL APIs) and modern technologies (React Native, NestJS, Prisma, Kafka).

    CEO & Co-Founder - ApkFly (APK Distribution Platform)

    Leading the development of a TestFlight alternative for Android. Implemented CI/CD with EAS for automated builds, JWT authentication + role-based access for developers, and cloud storage integration for APKs (S3-compatible).

    React NativeExpoEASNestJSPrismaPostgreSQLAWS

    Fullstack Developer & E-Commerce Lead - Tecopos

    Promoted from Mobile Developer to department head. Designed a multicurrency payment gateway (Stripe/Tropipay adapters), optimized search latency by 40% using Elasticsearch, and led monolith-to-microservices migration with Kafka messaging. Gained extensive experience in fullstack web development and mobile app development.

    GraphQLgRPCKafkaElasticsearchPrismaReact.js

  • Lead Backend Dev

    2022-2023

    Lead backend development for a genetic analysis platform with 3D protein visualization.

    Lead Backend Developer - PhylluCI (Bioinformatics)

    Implemented subprocess pipeline for sequence alignment and dynamic project history tracking system for this genetic analysis platform with 3D protein visualization.

    PythonDjangoPostgreSQLMultithreadingAsync WorkersBig DataBioPython

  • Freelancer

    Since 2020

    I have been a freelance developer for 4+ years, working on various projects for clients from different parts of the world, developing web and mobile applications as a fullstack developer.

    Backend Developer - FaztGrab 🏬 [E-Commerce]

    Developed microservices backend architecture for the Fazt Grab e-commerce platform, implementing secure authentication and scalable API endpoints.

    NestJSPostgreSQLMicroservicesJWTAWSRESTful API

    Frontend Developer - Mascolive 🏥 [Veterinary Clinic]

    Created real-time analytics dashboard using Chart.js for the Macolive veterinary clinic, enabling business insights through data visualization.

    JavaScriptChart.jsReal-time AnalyticsData Visualization

  • Thesis Project

    2024

    Undergraduate thesis project at the University of Informatic Sciences of Cuba.

    Fullstack Developer - Junior 📱 [Educational App]

    Developed a cross-platform mobile application for teaching basic programming concepts to beginners with no prior knowledge. Implemented a custom AI recommendation system using PyTorch to personalize learning paths and provide adaptive content based on user progress.

    React NativePyTorchAICross-platform Development

Featured Projects

Showcasing my best work across full-stack development, from mobile apps to bioinformatics platforms and open-source libraries.

ApkFly
React NativeExpoNestJS +4
● Live

ApkFly

TestFlight alternative for Android developers. A modern platform for app distribution, testing, and feedback collection with robust authentication and automated CI/CD.

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ApkFly
● Live

ApkFly

Project Overview

ApkFly is a comprehensive platform designed to simplify the Android app testing workflow. As CEO & Co-Founder, I built a scalable system that allows developers to distribute test versions of their apps seamlessly. The platform features cloud storage integration for APK files, role-based access control, automated builds via EAS, and comprehensive analytics for developers to track usage and gather feedback.

Technologies

React NativeExpoNestJSPrismaPostgreSQLAWSJWT
View Source Live Demo
X-Lab Phylogenetics
DjangoReactPostgreSQL +3
● In Development

X-Lab Phylogenetics

Advanced bioinformatics platform enabling researchers to compile, analyze and visualize genetic sequences with 3D protein modeling capabilities.

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X-Lab Phylogenetics
● In Development

X-Lab Phylogenetics

Project Overview

X-Lab is a cutting-edge platform designed for genetic researchers and bioinformatics professionals. As Lead Backend Developer, I implemented a sophisticated processing pipeline for sequence alignment that handles large biological datasets efficiently. The platform leverages Django's robust backend capabilities with multithreading to process complex genetic data, while providing intuitive visualization tools for researchers to interpret results through an interactive 3D protein visualization interface.

Technologies

DjangoReactPostgreSQLBioPythonMultithreadingPython
View Source
Cyber Coffee
Next.jsTailwind CSSMarkdown +1
● Live

Cyber Coffee

Developer-focused programming blog with comprehensive documentation on project structures, technology implementations, and coding best practices.

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Cyber Coffee
● Live

Cyber Coffee

Project Overview

Cyber Coffee is a knowledge-sharing platform I created for the developer community. The blog features in-depth technical articles, tutorials, and documentation on modern software development practices. Content ranges from architecture design patterns to practical implementations of complex technologies. Built with Next.js and optimized for performance, the site delivers a seamless reading experience with syntax highlighting for code examples and responsive design for all devices.

Technologies

Next.jsTailwind CSSMarkdownSEO Optimization
Live Demo
View all projects

My name is Leandro González Espinosa, I am 23 years old and I graduated from the Fac. Computational Sciences and Technologies (University of Informatic Sciences of Cuba). I've been a freelance developer for 4 years. I am passionate about facing new challenges and finding creative and innovative solutions through software development. I cover several fields within software development including web development. During my time as a university student I achieved great merits in programming and database events. I am currently participating in a project focused on the development of a platform for the study of Phylogenetics where I have the role of lead backend developer. I am also focusing my studies towards artificial intelligence and Data Science.

Skills

NestJS NestJS
Prisma Prisma
PostgreSQL PostgreSQL
MySQL MySQL
SQLite SQLite
Redis Redis
MongoDB MongoDB
TypeScript TypeScript
Node.js Node.js
Express.js Express.js
Astro Astro
Apollo Apollo
Next.js Next.js
Tailwind CSS Tailwind CSS
Figma Figma
AWS AWS
GraphQL GraphQL
gRPC gRPC
Kafka Kafka
Elasticsearch Elasticsearch
React.js React.js
Python Python
Django Django
FastAPI FastAPI
JavaScript JavaScript
Expo Expo
Docker Docker
PyQt PyQt

Let's connect and collaborate!

Want to work with Leo? Send mail to hello@leo or use the contact form below.