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I'm a full-stack web developer with 13 years of experience building scalable, secure, and high-performance web applications across both the front-end and back-end ecosystems. I possess a strong analytical mindset and proven expertise in root cause identification, system performance optimization, clean coding, adherence to documentation standards, and delivery of maintainable solutions that follow best development practices. Experience with React, Next.js, and React Native allows me to deliver intuitive, responsive, and cross-platform user experiences. With a strong sense of ownership, and a continuous learning mindset, I'm always eager to embrace. I'm Partnered with 12+ cross-functional teams across design, product, and backend engineering., mentoring new hires, and delivering high-quality, scalable solutions that support business goals.…I'm a full-stack web developer with 13 years of experience building scalable, secure, and high-performance web applications across both the front-end and back-end ecosystems. I possess a strong analytical mindset and proven expertise in root cause identification, system performance optimization, clean coding, adherence to documentation standards, and delivery of maintainable solutions that follow best development practices. Experience with React, Next.js, and React Native allows me to deliver intuitive, responsive, and cross-platform user experiences. With a strong sense of ownership, and a continuous learning mindset, I'm always eager to embrace. I'm Partnered with 12+ cross-functional teams across design, product, and backend engineering., mentoring new hires, and delivering high-quality, scalable solutions that support business goals.

Luis Delgado

AI Developer, Web Developer, Front-End Developer, +2

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I'm a full-stack web developer with 13 years of experience building scalable, secure, and high-performance web applications across both the front-end and back-end ecosystems. I possess a strong analytical mindset and proven expertise in root cause identification, system performance optimization, clean coding, adherence to documentation standards, and delivery of maintainable solutions that follow best development practices. Experience with React, Next.js, and React Native allows me to deliver intuitive, responsive, and cross-platform user experiences. With a strong sense of ownership, and a continuous learning mindset, I'm always eager to embrace. I'm Partnered with 12+ cross-functional teams across design, product, and backend engineering., mentoring new hires, and delivering high-quality, scalable solutions that support business goals.…I'm a full-stack web developer with 13 years of experience building scalable, secure, and high-performance web applications across both the front-end and back-end ecosystems. I possess a strong analytical mindset and proven expertise in root cause identification, system performance optimization, clean coding, adherence to documentation standards, and delivery of maintainable solutions that follow best development practices. Experience with React, Next.js, and React Native allows me to deliver intuitive, responsive, and cross-platform user experiences. With a strong sense of ownership, and a continuous learning mindset, I'm always eager to embrace. I'm Partnered with 12+ cross-functional teams across design, product, and backend engineering., mentoring new hires, and delivering high-quality, scalable solutions that support business goals.

Available to hire

I’m a full-stack web developer with 13 years of experience building scalable, secure, and high-performance web
applications across both the front-end and back-end ecosystems. I possess a strong analytical mindset and proven
expertise in root cause identification, system performance optimization, clean coding, adherence to documentation
standards, and delivery of maintainable solutions that follow best development practices.
Experience with React, Next.js, and React Native allows me to deliver intuitive, responsive, and cross-platform
user experiences.
With a strong sense of ownership, and a continuous learning mindset, I’m always eager to embrace. I’m Partnered
with 12+ cross-functional teams across design, product, and backend engineering., mentoring new hires, and
delivering high-quality, scalable solutions that support business goals.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Principal Front-End Engineer at Spotify

January 1, 2023 - September 1, 2025

Engineered high-performance interfaces using React 18, TypeScript, Node.js, and Kotlin, improving UI responsiveness by 28% for 480M+ users. Migrated 1M+ LOC into micro-frontends with TurboRepo, Module Federation, and Webpack, reducing release friction by 40%. Standardized UI systems with Storybook, Figma, and Web Components, cutting design inconsistencies 35–50%. Cut median TTI from 2.9s to 1.8s via SSR, progressive hydration, and Vercel Edge optimizations. Built three shared React + TypeScript libraries, reducing duplicated engineering work by 40% and bundle size by 45%. Improved API efficiency through GraphQL and REST, lowering payloads by 22% and increasing throughput by 18%. Strengthened Web Vitals stability by 42% by optimizing React 18 hydration and suspense boundaries. Introduced observability with OpenTelemetry, Sentry, DataDog, reducing MTTR from 2.3h to 45m. Accelerated CI/CD using GitHub Actions, Docker, Vercel, cutting build times by 52%. Strengthened engineering consiste

Senior Front-End Developer at Booking.com

April 1, 2018 - November 1, 2022

Directed global-scale UI interfaces using React, Redux, and TypeScript, enabling 2.1B+ annual sessions across high-traffic booking flows. Revamped Next.js SSR and caching strategy, reducing TTFB by 40% and driving YoY 12% organic visibility. Designed reusable UI systems with Storybook, Figma, and Web Components, lifting cross-team delivery throughput by 25–35%. Executed more than 120 optimized experiments, achieving 3–7% average conversion gains. Unified styling via Bootstrap, SASS, and LESS, reducing UI inconsistencies by 50–60%. Automated build processes using Gulp and Webpack, reducing deployment time from 15 minutes to 3 minutes. Strengthened reliability with Karma and Jasmine, resulting in 40% fewer production incidents. Optimized CI/CD workflows via GitHub Actions, cutting release failures by 55%. Refined design-to-engineering collaboration using Figma tokens, reducing hand-off time by 60%. Launched independent deployment pipelines using React micro-frontends, tripling rele

Junior Front-End Developer at Siemens Digital Industries

December 1, 2015 - March 1, 2018

Constructed industrial analytics dashboards using Angular, React, and TypeScript, supporting 5M+ daily authentications (99.99% uptime). Developed modules using AngularJS and jQuery, reducing authentication latency by 27%. Engineered operational dashboards powered by REST APIs, cutting data synchronization failures by 48%. Unified styling via Bootstrap, SASS, and LESS, reducing UI inconsistencies by 50–60%. Automated build processes using Gulp and Webpack, reducing deployment time from 15m to 3m. Strengthened reliability with Karma and Jasmine, resulting in 40% fewer production incidents. Optimized CI/CD workflows via GitHub Actions, cutting release failures by 55%. Refined design-to-engineering collaboration using Figma tokens, reducing hand-off time by 60%. Launched independent deployment pipelines using React micro-frontends, tripling release velocity.

Junior Front-End Developer at Gemalto

July 1, 2012 - October 1, 2015

Created identity-management UIs with HTML5, CSS3, JavaScript, supporting 5M+ daily authentications (99.99% uptime). Developed modules using AngularJS and jQuery, reducing authentication latency by 27%. Engineered operational dashboards powered by REST APIs, cutting data synchronization issues by 48%. Unified styling via Bootstrap, SASS, and LESS, cutting UI inconsistencies 50–60%. Automated build processes using Gulp and Webpack, reducing deployment time from 15m to 3m. Strengthened reliability with Karma and Jasmine, resulting in 40% fewer production incidents. Optimized CI/CD workflows via GitHub Actions, cutting release failures by 55%. Refined design-to-engineering collaboration using Figma tokens, reducing hand-off time by 60%. Launched independent deployment pipelines using React micro-frontends, tripling release velocity.