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Jeff Barragán

Resume

  1. Senior Software Engineer

    Mercado Libre · Mercado PagoCurrent
    Nov 2022 — PresentBogotá, Colombia

    Latin America's largest e-commerce and fintech platform, operating across 18+ countries. Embedded in the Mercado Pago fintech vertical, building crypto products at scale.

    • Leads frontend development across a suite of 5 interconnected crypto applications covering the full P2P buy, sell and hold flow for multiple digital assets — including MeliDólar, MeLi's USD-backed stablecoin with 65M+ USD in circulation.
    • Led the fragmentation of the Product Detail Page, MeLi's highest-traffic view, extracting shared UI components into a reusable library inside a monorepo shared by ~1,000 engineers. Reduced bundle size by ~35% and CI pipeline execution by 25%, with full test coverage and zero regressions.
    • Built a component and shared utility library adopted by the Demand team, MeLi's largest IT division, standardising frontend patterns across microservices serving 18+ countries.
    • Contributed to the technical integration of MeLi's official Apple Store seller channel, a cross-functional initiative that drove a 45% increase in official seller sales volume.
    • Structured the technical onboarding for the crypto area and built mentorship and growth plans to close skill gaps across the team.
    • React 19
    • TypeScript (strict)
    • Nordic
    • Andes Design System
    • Node.js
    • Turborepo
    • Rollup
    • Vitest
    • Playwright
    • DataDog
  2. Freelance Full-Stack Developer

    IndependentCurrent
    2018 — PresentColombia (Remote)

    20+ projects across e-commerce, content platforms and digital marketing for clients in Colombia and Latin America.

    • Built headless e-commerce solutions connecting Strapi CMS, including custom plugin development, to Next.js storefronts — giving non-technical teams full editorial control.
    • Wrote custom WordPress plugins for specific client business logic, extending the platform beyond its out-of-the-box capabilities.
    • Designed and shipped custom WordPress themes from mockup to production: pixel-perfect, responsive and cross-browser.
    • Ran technical SEO for e-commerce clients — indexation, on-page structure and metadata — for measurable gains in qualified traffic and conversions.
    • Next.js
    • Strapi
    • WordPress
    • PHP
    • TypeScript
    • SEO
  3. Web UI Senior Engineer

    Globant
    Aug 2020 — Nov 2022Bogotá, Colombia

    Global digital transformation firm serving Fortune 500 companies. Two high-impact client engagements, in fintech and OTT media.

    • NERA (Banco Galicia) — acted as de facto Technical Lead for a 6-engineer frontend team on the MVP of Argentina's largest bank's agri-finance platform, running sprint ceremonies, code review as approver and architecture decisions. Delivered on schedule; the platform has since grown to USD 1.2B+ in financing operations, 12,000+ registered producers, and a joint venture with Santander across Argentina, Paraguay and Uruguay.
    • Defined NERA's frontend architecture for credit and financing workflows, handling multi-product structures — credits in pesos, USD and grain tokens — under high reliability requirements.
    • DTV GO (DirecTV Latin America) — solved a critical integration problem in the OTT subscriber self-care app, where every vendor and add-on carried an incompatible data schema.
    • Introduced an Adapter pattern to normalise divergent vendor schemas, so new subscription plans could be added without breaking existing flows.
    • React
    • TypeScript
    • Vue.js
    • Redux Sagas
    • GraphQL
    • Jest
    • Webpack
    • CircleCI
  4. Full-Stack Engineer

    Booklick
    Feb 2020 — Aug 2020Bogotá, Colombia

    EdTech startup — a Netflix-like experience for university knowledge, sharing content across ~20 Colombian universities including Universidad de Los Andes and Universidad Nacional.

    • Engineered the push notification system with Firebase Cloud Messaging and AWS Lambda, delivering real-time alerts across the university network.
    • Built and maintained the Node.js/Express REST API for content discovery and cross-institutional sharing, in a 3-engineer team.
    • Architected and deployed the AWS infrastructure (EC2, S3, Lambda), ensuring reliability and environment parity.
    • Node.js
    • Express
    • AWS
    • Firebase Cloud Messaging

Earlier

Earlier roles (2015 — 2019) at Indra in-house at Tigo, PMK in-house at Claro Colombia, and Digital Andes — telecom payment platforms, a jQuery-to-ES6+ migration, a Drupal 7→8 corporate migration, and 40+ client sites and interactive training modules.

Education

  • B.S. Software Engineering

    Universidad Piloto de Colombia2010 — 2016
  • Technical Master Program

    Platzi2020 — Present

    60+ courses: React, TypeScript, Vue, Angular, CI/CD, NoSQL, GraphQL, performance, cloud architecture, testing and TDD.

Languages

  • Spanish — Native
  • English — Professional working proficiency (C1)

Skills

Frontend

  • React 1995%
  • TypeScript (strict)95%
  • Next.js90%
  • JavaScript (ES2023+)95%
  • Vue.js70%
  • Angular65%
  • SCSS85%
  • TailwindCSS80%

State & Data

  • Redux / Redux Sagas85%
  • React Query85%
  • Zustand80%
  • GraphQL75%
  • REST API90%

Backend & CMS

  • Node.js90%
  • Express.js85%
  • Strapi (custom plugins)85%
  • WordPress (themes & plugins)80%
  • PHP70%
  • Python60%

Testing

  • Jest90%
  • Vitest85%
  • React Testing Library90%
  • Playwright80%
  • Cypress70%

Architecture & Tooling

  • Monorepos (Turborepo, Lerna)85%
  • Design Systems90%
  • Micro-frontends80%
  • Clean architecture85%
  • Webpack 5 / Rollup80%

Cloud & DevOps

  • AWS (EC2, S3, Lambda, Route53)75%
  • Docker75%
  • GitHub Actions80%
  • CircleCI70%
  • GCP (App Engine)60%

Databases

  • PostgreSQL80%
  • MongoDB75%
  • Redis70%
  • DynamoDB65%
  • MySQL75%

SEO & Observability

  • Technical SEO85%
  • Core Web Vitals85%
  • DataDog75%
  • New Relic70%
  • Grafana70%

AI Tooling

  • Claude Code (SDD)90%
  • n8n (workflow automation)75%
  • Autonomous agents70%

What I do

Full-Stack Product Development

End-to-end delivery of production applications with React, Next.js, and Node.js — from data model to deployed UI, built for teams shipping at scale.

Frontend Architecture

Design and structure of maintainable frontend systems — component architecture, state management, and performance-minded rendering patterns for complex products.

Design Systems & Monorepos

Shared component and utility libraries in Turborepo or Lerna monorepos — the kind adopted across microservices by large engineering orgs, cutting duplication and bundle size.

Headless Commerce & CMS Integration

Strapi-based headless CMS setups with custom plugin development, connecting content and product data to fast, SEO-friendly Next.js storefronts.

Technical SEO & Core Web Vitals

Indexation, on-page structure, metadata and Core Web Vitals work for e-commerce and content sites, aimed at measurable gains in qualified traffic.

Payments Integration

Integration of payment providers such as MercadoPago into e-commerce and fintech flows, including plugin-level work for CMS platforms.

Cloud & CI/CD

Containerized deployments and automated pipelines with Docker, AWS, and GitHub Actions to keep releases fast and reliable.

AI-Assisted Development Workflows

Practical adoption of AI tooling such as Claude Code and n8n into day-to-day engineering workflows to speed up delivery without sacrificing quality.