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Adrian Alvarez

Fullstack Developer specializing in backend systems, APIs, and data architecture.

Overview

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3,581 contributions in 2026 on GitHub.
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About

Hi! I’m Adrián Álvarez — a Senior Fullstack Developer with deep expertise in backend systems, API architecture, and data engineering.I specialize in designing and building scalable server-side solutions using Node.js, Express, and NestJS. I architect robust data pipelines with MongoDB and Redis, optimize database performance, containerize applications with Docker, and implement production-grade CI/CD workflows with GitHub Actions. My experience spans building RESTful APIs, microservice architectures, and data-driven applications that handle complex business logic and high-volume data processing.Over the last few years, I’ve worked with agencies and startups across Europe and the US, leading backend infrastructure development for eCommerce platforms, automating data pipelines, and integrating AI-powered tools into production systems. I’ve designed database schemas for scalability, implemented caching strategies, and optimized API performance. I also leverage AI tools in my engineering workflow to accelerate development and maintain high code quality standards.I combine backend engineering rigor with fullstack capability, ensuring seamless integration between server and client layers. Whether architecting APIs, optimizing databases, or deploying containerized services, I focus on building systems that are reliable, performant, and maintainable.Beyond the code, I bring a strategic mindset — every architecture decision I make considers scalability, data integrity, security, and business objectives.Let’s build backend systems that scale.

  • TypeScript iconTypeScript
  • JavaScript iconJavaScript
  • Python iconPython
  • Node.js iconNode.js
  • Hono iconHono
  • NestJS iconNestJS
  • Express iconExpress
  • React iconReact
  • Preact iconPreact
  • Next.js iconNext.js
  • Tailwind CSS iconTailwind CSS
  • Sass iconSass
  • shadcn/ui iconshadcn/ui
  • Redux iconRedux
  • React Router iconReact Router
  • Jest iconJest
  • GitHub Actions iconGitHub Actions
  • Turborepo iconTurborepo
  • Webpack iconWebpack
  • Git iconGit
  • Docker iconDocker
  • MongoDB iconMongoDB
  • Redis iconRedis
  • Figma iconFigma

Blog Posts(4)

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Experiences

Kreitech

Current Employer
  • Architected and implemented backend APIs using Node.js, Hono, and Deno, supporting diverse web applications across multiple markets.
  • Designed RESTful API endpoints and server-side logic to handle complex business requirements for US market-focused projects.
  • Optimized database queries and implemented caching strategies for improved API performance and scalability.
  • Collaborated with cross-functional teams to align backend architecture with product requirements and system performance goals.
  • Integrated frontend frameworks (Next.js, React, Astro) with robust backend systems, ensuring seamless end-to-end functionality.
  • Leveraged AI tools to accelerate backend development and code quality automation.
  • Node.js
  • Hono
  • Deno
  • TypeScript
  • API Design
  • Database Optimization
  • Next.js
  • React
  • Astro
  • Vercel

DocTech World

  • Led technical architecture and backend infrastructure design for personalized e-commerce and SaaS platforms from concept to production.
  • Architected scalable API layers using Node.js and Express, handling complex data workflows and business logic.
  • Designed database schemas and implemented MongoDB-based data models optimized for e-commerce and SaaS use cases.
  • Containerized applications using Docker and orchestrated deployment pipelines for consistent, reliable releases.
  • Managed technical teams and mentored junior developers on backend best practices, microservice patterns, and system design.
  • Integrated headless CMS solutions (Sanity) with custom backend APIs, creating flexible content delivery systems.
  • Optimized API performance and implemented caching strategies using Redis for high-traffic platforms.
  • Node.js
  • Express
  • TypeScript
  • MongoDB
  • Redis
  • Docker
  • API Architecture
  • Sanity
  • Shopify
  • System Design

3dids

  • Engineered custom backend solutions and server-side logic for Shopify e-commerce platforms using Liquid and JavaScript.
  • Built modular, reusable API endpoints and webhooks integrating Shopify with external systems and business workflows.
  • Optimized data retrieval and rendering performance for high-traffic e-commerce stores, ensuring sub-second response times.
  • Developed complex e-commerce features including custom checkout flows, inventory management, and payment processing integrations.
  • Implemented JavaScript-based automation scripts to streamline data synchronization and operational workflows.
  • Integrated third-party services and maintained technical documentation for scalable, maintainable solutions.
  • Used AI tools to optimize code performance and accelerate feature development cycles.
  • Shopify
  • Liquid
  • JavaScript
  • API Integration
  • Webhooks
  • E-Commerce
  • Data Optimization
  • Payment Integration
  • Node.js

Desoft

  • Developed interactive and optimized interfaces using React and TypeScript, with focus on performance and maintainability.
  • Implemented server-side logic and API integrations to support frontend functionality.
  • Applied design patterns and software architecture principles to improve code scalability and reusability.
  • Optimized application performance through bundle analysis, code splitting, and build tool configuration (Webpack, Turbopack).
  • Maintained and refactored existing web applications, improving code quality and reducing technical debt.
  • Collaborated with backend engineers to design efficient APIs and data flows for complex features.
  • Gained foundational knowledge in full-stack development practices and system design.
  • React
  • TypeScript
  • API Integration
  • Webpack
  • Turbopack
  • Software Architecture
  • Performance Optimization
  • Fullstack Development
  • Built responsive user interfaces using React components, hooks, and TypeScript for type safety.
  • Learned and implemented TypeScript types, interfaces, and generic types for better code maintainability.
  • Assisted in maintaining production React applications, debugging issues, and implementing bug fixes.
  • Worked with build tools (Webpack, Turbopack) to understand bundling, module resolution, and performance optimization.
  • Collaborated with senior developers to learn software architecture patterns and best practices in full-stack development.
  • Participated in code reviews and gained exposure to API integration and backend workflows.
  • Developed foundational understanding of the full software development lifecycle.
  • React
  • TypeScript
  • Webpack
  • Turbopack
  • Software Architecture
  • API Integration
  • Performance Optimization
  • Code Review

Freelance Projects

Current Employer
  • Architected and developed custom end-to-end solutions for e-commerce platforms and SaaS applications, from backend infrastructure to client interfaces.
  • Designed and built scalable Node.js backends, REST APIs, and microservices handling complex business logic and high-volume data processing.
  • Implemented database design and optimization strategies using MongoDB and Redis, ensuring performance at scale.
  • Containerized applications with Docker and established CI/CD pipelines for automated, reliable deployments.
  • Integrated frontend frameworks (React, Next.js) with robust backend systems, ensuring seamless fullstack functionality.
  • Led technical architecture decisions for client projects, balancing scalability, performance, and business requirements.
  • Mentored junior developers on backend engineering practices, system design, and code quality standards.
  • Leveraged AI tools to enhance development efficiency and maintain high standards across projects.
  • Node.js
  • Express
  • React
  • Next.js
  • MongoDB
  • Redis
  • Docker
  • CI/CD
  • API Design
  • System Architecture
  • E-Commerce
  • Performance
  • Tailwind CSS
  • TypeScript

Projects(6)

Certifications(6)