# Oscar Arenas **Senior Frontend Engineer · React · Next.js · TypeScript · Design Systems** Bogotá, Colombia — Open to remote (LATAM · US · EU) | oscarenas@gmail.com | https://www.linkedin.com/in/oscarenas | https://github.com/oscarenas | https://resume-oscarenas.web.app/?utm_source=cv_md&utm_medium=document ## Summary Senior frontend engineer with 17+ years shipping web products for global brands. I specialize in React, Next.js and TypeScript, design systems, accessibility (WCAG 2.2) and Core Web Vitals, with Node.js on the back end. At Publicis Global Delivery (Publicis Sapient) I led the front-end architecture of a North American sports league's digital platform and built React component libraries adopted across 90 product squads. I mentor engineers on TypeScript, accessibility and performance, and use AI for coding, review and delivery to move faster without compromising architecture. ## Experience ### Senior Technology Engineer — Publicis Global Delivery (PGD) Nov 2023 – Present · Bogotá, Colombia · Hybrid · Frontend · Experience Technology Scope: Front-end architecture lead · 12 engineers mentored · component libraries used by 90 product squads - Led the front-end architecture of a North American sports league's digital platform (dashboards and ecommerce), built on Next.js (App Router), TypeScript and a headless CMS. - Partnered with design and product teams to translate Figma systems into production-grade React component libraries adopted across 90 product squads. - Mentored 12 mid-level engineers on TypeScript patterns, accessibility and Core Web Vitals optimization. Stack: Next.js, TypeScript, Node.js, React, Tailwind CSS, GraphQL, Vercel, Jira ### Senior Frontend Developer — DevSavant Aug 2021 – Aug 2023 · Bogotá, Colombia · Remote Scope: Senior IC · end-to-end feature owner · distributed LATAM/US team - Senior IC on a small, distributed team delivering Next.js + Node.js applications for US clients. - Designed and shipped a SaaS dashboard, e-commerce storefront and internal tools using Next.js, TypeScript and Supabase, replacing a legacy system. - Owned the full feature lifecycle from technical scoping to production deploy, working async across LATAM/US time zones. Stack: Next.js, React, Node.js, TypeScript, Supabase, PostgreSQL ### Senior Software Engineer — Endava Jan 2021 – Aug 2021 · Bogotá, Colombia · Hybrid · Frontend architecture Scope: Technical leadership on modular frontend architectures · global financial and retail clients - Provided technical leadership on modular frontend architectures for global financial and retail clients. - Partnered with architects and product owners to translate business rules into maintainable React and TypeScript components. Stack: React, TypeScript, Redux, Node.js, Jest, Webpack ### Senior Frontend Developer — Globant Apr 2018 – Jul 2020 · Bogotá metro area · Hybrid Scope: Senior IC · drove TypeScript, design-system and accessibility work across 3 teams - Built payment methods and streaming apps using React, Redux and Node.js. - Drove migration to TypeScript, design-system rollout and accessibility audits across 3 teams. Stack: React, JavaScript, Node.js, Redux, CSS-in-JS ### Senior Frontend Developer — Telintel Sep 2015 – Apr 2018 · Bogotá, Colombia - Built and maintained internal tooling and customer-facing applications for a Colombian telecom software company using JavaScript, Angular, React and Polymer. - Modernized legacy JavaScript codebases, introducing modular patterns and reusable UI components. Stack: JavaScript, Angular, React, Polymer, HTML5, CSS3 ### Web Designer & Developer — 1A Hosting Jan 2009 – Apr 2018 · Remote - Ran a freelance web design and development practice in parallel to full-time roles, delivering 67 sites for small and mid-sized businesses in Colombia. ### Web Designer — HostDime Global Nov 2008 – Jan 2015 · Remote - Early-career web designer at a US-headquartered hosting company, building a foundation in HTML/CSS, design tools and web fundamentals. ## Projects ### This site: an agent-ready resume Side project · https://resume-oscarenas.web.app/ - Bilingual static site (Astro + Tailwind CSS) whose resume data is published as HTML, JSON-LD and resume.json, with on-device semantic search, WebMCP tools for AI agents and PDF/DOCX CVs generated at build time. - 19 agent tools, and CVs in 2 languages as PDF (3 focus versions), Word and Markdown, generated from the same data on every release. Stack: Astro, TypeScript, Tailwind CSS, Transformers.js, WebMCP, JSON-LD, Puppeteer, Playwright, Vitest, GitHub Actions, Lighthouse CI, Firebase Hosting ## Skills - Frontend: React, Next.js, Astro, Vue, Angular - Languages & styling: TypeScript, JavaScript (ES202x), HTML5, CSS3, Tailwind CSS, SCSS, CSS-in-JS - State & data: Redux, Zustand, Context API, GraphQL (Apollo), REST APIs - Backend & databases: Node.js, Express, Supabase, PostgreSQL, MySQL - Testing & quality: Jest, React Testing Library, Cypress, ESLint / Prettier - Platform & DevOps: Vercel, Firebase, GitHub Actions, CI/CD, Linux - Craft & practices: Design systems, Accessibility (WCAG 2.2), Core Web Vitals, Technical leadership, Mentoring, Micro-frontends, PWA & Service Workers, Web security (OWASP Top 10), schema.org / JSON-LD - AI & augmented delivery: Prompt engineering, AI-assisted coding, Transformers.js · on-device inference, Embeddings & semantic search, WebMCP · agent-ready web, OpenAI & Anthropic APIs, Structured outputs, LLM product flows - Design & tooling: Figma, Design tokens, Storybook, Prototyping, Puppeteer, Jira ## Certifications - Complete Prompt Engineering, ChatGPT & AI Bootcamp — Udemy · 2025 · 35.5 h — https://ude.my/UC-e7b48ddb-1e78-4127-99da-cb01ae655e89 - The Complete Node.js Developer Course (3rd Edition) — Udemy · 2025 · 35 h — https://ude.my/UC-88977f95-84e4-4384-8ef2-4cc302a64062 - Figma UI UX Design Essentials — Udemy · 2025 · 12 h — https://ude.my/UC-d11b12cc-d54c-4f84-8507-806944bdb71b - Learning the OWASP Top 10 — LinkedIn Learning · 2018 - Developing Secure Software — LinkedIn Learning · 2018 13 certificates · 251 h of learning since 2025 · full verifiable list at https://resume-oscarenas.web.app/#certifications ## Education - Bachelor's in Systems Engineering — Universidad del Tolima · Ibagué, Colombia · 2001 – 2007 ## Languages - Spanish: Native - English: Professional working proficiency --- Updated Sep 2026 · https://resume-oscarenas.web.app/cv/oscar-arenas-en.md