Sergi Falcón Xarau
Senior Product Engineer
Full-stack Growth Engineer with end-to-end ownership: experimentation, analytics, product spec, and React/Next.js implementation through deployment and production. Shipped Porsche's first AI-powered marketing feature, ran A/B tests and content personalization at scale, and co-founded a referral platform startup. Uses AI tools daily (Cursor, Claude) to speed up engineering and product work.
Work Experience
Senior Product Engineer
Feb 2024 - Present
Porsche Digital
Barcelona, Spain
Astro.JS Vue TypeScript AI A/B Testing SEO Google Analytics AWS Storyblok
- Own the full growth-engineering pipeline for a core porsche.com workstream: discovery, experimentation, product spec, architecture, implementation, release, and production. Partner directly with product, marketing, and market stakeholders.
- Invented and built Porsche's first AI marketing feature end-to-end: an AI-powered model finder (natural-language search) live in production on porsche.com/uk, increasing engagement by 200%+ vs. the legacy search experience.
- Ran A/B tests across components, campaigns, and page structures using Google Tag Manager and Google Analytics. Built content personalization with Salesforce and Astro Islands to serve tailored experiences per market.
- Led the front-end architecture migration of porsche.com, delivering a modern stack using AstroJS and VueJS/TypeScript, improving page load performance and SEO signals by up to 40% across global regions.
- Architected and maintained CI/CD pipelines using AWS and GitLab CI, enabling daily production deployments across 85+ markets.
- Integrated Storyblok CMS with NodeJS services, enabling real-time content delivery and reducing content publishing time by 70% for experiences serving millions of users monthly.
Full Stack Engineer
May 2023 - Feb 2024
Viaplay
Barcelona, Spain
React NextJS TypeScript Cypress PHP NX AWS Conversion Optimization
- Owned checkout and payments end-to-end (Viaplay's core conversion flow) using React, TypeScript, Next.js, and NX monorepo, speeding up feature delivery by 30%.
- Introduced the first automated E2E and smoke testing suite using Cypress, increasing release confidence and reducing hotfixes by 50%.
- Developed backend services and payment features using PHP (Yii), improving checkout reliability and reducing payment failures.
- Contributed to shared component architecture used across multiple product teams, improving UI consistency and reducing duplicated code.
Engineering Manager
Sep 2022 - May 2023
Fever
Barcelona, Spain
Product Management OKRs Data-driven
- Led and mentored a cross-functional engineering team, improving sprint predictability and delivery success rate by 35%.
- Partnered with product leadership and stakeholders to shape roadmap priorities from business problems into shipped outcomes aligned with KPIs.
- Implemented data-driven performance tracking using engineering metrics and OKRs, reducing technical debt backlog.
Team Lead & Senior Frontend Engineer
Jul 2020 - Sep 2022
SEAT:CODE
Barcelona, Spain
Angular Nx Monorepo TDD GitHub Actions SonarQube Microfrontends
- Led a team of 9 engineers delivering large-scale digital automotive platforms using micro front-end architecture.
- Designed and scaled micro front-end architecture using Angular, Nx Monorepo, and TDD, improving platform scalability and reducing integration defects.
- Built enterprise CI pipelines using GitHub Actions, SonarQube, and automated testing suites, increasing code quality and reducing production incidents.
Frontend Engineer
Jun 2019 - Sep 2020
Credimarket
Barcelona, Spain
Angular Verdaccio Socket.io Akita Reactive Programming
- Architected front-end platform for internal CRM using Angular and reactive programming, improving internal operational efficiency.
- Built reusable component libraries distributed via Verdaccio, accelerating internal product development.
- Implemented real-time features using Socket.io and state management using Akita, improving user interaction performance.
Frontend Engineer
May 2018 - Jun 2019
Worldline
Barcelona, Spain
Angular JavaScript Accessibility Cross-browser
- Delivered multiple client-facing projects, including fintech dashboards, healthcare chat platforms, and interactive web applications, working closely with customers from requirements to delivery.
- Implemented cross-browser compatibility and accessibility standards, improving product usability and compliance.
Web Developer
Mar 2015 - Apr 2017
IndianWebs
Barcelona, Spain
PHP JavaScript Prestashop CSS jQuery
- Delivered full-stack web solutions for SMEs including e-commerce platforms using PHP, JavaScript, and Prestashop.
- Helped local businesses digitize operations and launch online sales channels from zero.
Extracurricular
Co-founder
Jan 2020 - Present
Refy
Barcelona, Spain
SaaS Next.js NestJS DynamoDB Referral Systems 0→1
- Co-founded and shipped a 0→1 SaaS referral program platform used by multiple paying companies, designing the referral logic and attribution flow from scratch.
- Owned product spec and full-stack architecture using Next.js, NestJS, and DynamoDB, plus cloud infrastructure and the full product delivery lifecycle.
- Product: refyapp.com
Hackathon Winner
Jan 2023
Viaplay Hackathon
Barcelona, Spain
AWS Lambda AI Hackathon
- Built and deployed an AI-powered subtitle translation system using AWS Lambda enabling scalable multi-language content delivery.
Education
BSc Computer Science (Software Engineering)
Sep 2015 - Apr 2019
Autonomous University of Barcelona
Bachelor's Degree
Network Systems Administration
Sep 2013 - Apr 2015
Institut Bernat el Ferrer
Vocational Education and Training (VET)
Microcomputer Networking Systems
Sep 2010 - Apr 2012
Institut Bernat el Ferrer
Certificate of Higher Education (HNC)
Languages
C1
English C2
Spanish (native) C2
Catalan (native)