Diego Armando Carreño Serrano

Diego Armando Carreño Serrano  new_releases

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Frontend Developer, ReactJs, Typescript, MongoDB, SQL, NextJs, GraphQL
Colombia

Contact Diego regarding: 
Flexible work
Starting at USD20/hour
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Jobs verified_user 0% verified
  • Limestone Digital
    Full Stack Engineer public Remote experience
    Limestone Digital
    Jan 2025 - Current (1 year 10 months)
    Shipped route-tracking features on the core Routing team, improving real-time
    delivery visibility on a last-mile logistics platform.

    Led an AI-assisted dependency modernization (Claude, Cursor), migrating 30
    outdated packages — including the core React 17 → 18 upgrade — cutting
    technical debt and restoring security compliance.

    Eliminated performance bottlenecks in large data-table views by refactoring
    rendering — cut load times from 3+ seconds to under 1 second and significantly
    reduced memory consumption.

    Aligned API contracts with backend engineers, removing redundant data-fetching
    and simplifying frontend request logic.

    Implemented Cypress E2E/integration suites co
  • Lean Tech (LT)
    Mobile Application Developer public Remote experience
    Lean Tech (LT)
    Jul 2024 - May 2025 (11 months)
    Designed and built a mobile application from scratch (React Native, Expo, TypeScript) on a modular architecture, shipping to App Store and Google Play in under 8 months.

    Architected RESTful APIs on AWS (S3, Lambda, DynamoDB) for secure document storage, processing, and analytics.

    Created a fully themed Material UI design system with 30+ reusable components, accelerating UI delivery and ensuring accessibility across all products.

    Led a legacy refactor to Atomic Design, improving component reuse and team collaboration.

    Mentored 4 developers and introduced Playwright E2E testing, raising code-review standards team-wide.
  • Globant
    Frontend Web Developer public Remote experience
    Globant
    Apr 2022 - Sep 2024 (2 years 6 months)
    Led the migration of a critical banking application serving thousands of users from Angular to React (Next.js + Vite), delivering major gains in load performance, scalability, and maintainability.

    Built scalable microfrontend architecture with Next.js and TypeScript for an ecommerce client, enabling multiple teams to deploy independently.

    Delivered a fixed-budget insurance platform (NestJS microservices + React/Redux Toolkit) on time and within budget.

    Shipped game pages for a major gaming client (Next.js, NestJS, Contentful, AWS)built to absorb traffic spikes during title launches.

    Optimized MongoDB/Mongoose persistence with indexing strategies for high
    volume traffic; validated performance
  • Zipdev
    Frontend Developer public Remote experience
    Zipdev
    Jun 2021 - Sep 2022 (1 year 4 months)
    Engineered interactive marketing campaign interfaces (React, TypeScript) thatimproved engagement and conversion for automotive dealership clients.

    Deployed Node.js services on Azure with C#/.NET integrations; maintained PostgreSQL schemas with Prisma, ensuring data integrity across campaign pipelines.

    Automated CI/CD with Jenkins; enforced unit, integration, and E2E testing with Jest and React Testing Library.
  • Lilab
    Frontend Developer public Remote experience
    Lilab
    Nov 2020 - Jun 2022 (1 year 8 months)
    Lilab (Freelance, Peru): Built and maintained React UI components under Kanban with Bitbucket CI/CD.

    QCode (Medellín): Developed secure financial-services frontends in React integrating C# microservices; tested with Jest and Cypress.

    Comfenalco Antioquia (Medellín): Built fullstack applications and REST APIs (React, Express, Node.js, MongoDB) under Scrum
Education verified_user 0% verified
  • u
    Tecnología informática/Tecnología
    universidad del Santander UDES