Jose Antonio Serrano Peña

About

Experience

career.log — 5 roles, most recent first

1. February 2022 – Present

   Full Stack Developer

   Unosquare

   • -Built and maintained scalable web applications for Harvard University's online learning platform using Vue 3, Nuxt 3, NestJS, PostgreSQL, Redis, gRPC, and AWS in a microservices architecture.
   • -Led migration initiatives to modernize legacy systems, maintaining 99.9% uptime and seamless cross-service data synchronization.
   • -Optimized API performance and caching strategies, reducing response times by 35%.
   • -Earlier, designed high-performance React/Next.js/TypeScript applications and NestJS microservices for a behavioral-analytics platform, integrating AI-driven features and automating workflows to increase team efficiency by 30%.

   Vue 3Nuxt 3NestJSReactNext.jsTypeScriptPostgreSQLAWS

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2. February 2021 – February 2022

   Full-Stack Developer

   Infosys

   • -Built modular front-end components with React and TypeScript in a micro-frontend architecture, reducing release cycles by 20%.
   • -Integrated GraphQL microservices via Apollo Client, improving data handling and application responsiveness.
   • -Contributed to NestJS backend services supporting internal enterprise applications.
   • -Delivered an invoicing automation component that reduced processing time by 70%, significantly increasing analyst efficiency.

   ReactTypeScriptGraphQLApollo ClientNestJS

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3. May 2020 – February 2021

   Backend Developer

   R3D International

   • -Developed REST APIs with Node.js and Express, integrating them into React applications for enterprise clients.
   • -Built microservices on AWS Lambda, enabling automatic scaling to handle variable request loads.
   • -Collaborated with senior developers to strengthen backend reliability and maintainability.

   Node.jsExpressAWS LambdaReact

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4. June 2019 – May 2020

   Frontend & Alexa Developer

   YOIN App

   • -Built front-end components with Angular 7 and integrated REST APIs to improve user experience.
   • -Designed and shipped an Alexa Skill using AWS services and database connectivity for voice-command interactions.
   • -Delivered a client-adopted voice interaction feature that improved engagement and reduced support requests.

   Angular 7REST APIsAWSAlexa Skills Kit

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5. April 2018 – June 2019

   Front-End Developer

   Pincode

   • -Designed and built landing pages and single-page applications with HTML5, CSS, and JavaScript.
   • -Consumed REST APIs with Axios and integrated Firebase for authentication and hosting.
   • -Delivered first production-ready client applications, establishing core front-end fundamentals.

   HTML5CSSJavaScriptAxiosFirebase

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Skills

Projects

Harvard Online Learning Platform

Contributed to Harvard University's online learning platform, a microservices-based application built with Vue 3, Nuxt 3, and NestJS. Led modernization of legacy systems while keeping uptime at 99.9% and cutting API response times by 35%.

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Behavox Behavioral Analytics Platform

Built high-performance React and Next.js applications and NestJS microservices for a behavioral-analytics platform, integrating AI-driven features and automating internal workflows to increase team efficiency by 30%.

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Infosys

Designed and delivered an invoicing automation component within a micro-frontend architecture, cutting invoice processing time by 70% and significantly increasing analyst efficiency.

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Volkswagen LATAM

Built REST APIs with Node.js and Express, integrated into React applications, alongside AWS Lambda microservices that scaled automatically to handle variable enterprise request loads.

Private engagement — not publicly linked

Yoin — Alexa Voice Skill Integration

Designed and implemented an Alexa Skill using AWS services and database connectivity, bringing voice-command interactions to an existing product and improving client engagement.

Private engagement — not publicly linked

Landing Pages & SPA Development

Designed and built landing pages and single-page applications with HTML5, CSS, and JavaScript, integrating Firebase for authentication and hosting on early production applications.

Private engagement — not publicly linked

Education

Contact

Have a project in mind or want to talk tech? I'm always open to interesting conversations and new opportunities.