Available for new opportunities

Oscar Arenas

Senior Frontend / Experience Technology Engineer

14+ years shipping resilient, accessible web products at scale.

Years of experience: 16+
Core frameworks: 6
2025 learning hours: 251+

About

Senior Frontend Engineer with 14+ years designing, architecting and shipping web experiences for global brands. Deep focus on React, Vue, Angular and Astro ecosystems, modern TypeScript, design systems, accessibility (WCAG 2.2) and front-end performance. Actively investing in AI-augmented engineering — prompt engineering, LLM-powered product flows, and AI-assisted delivery — with 250+ hours of continuous learning in 2025 alone. Comfortable leading cross-functional squads, mentoring engineers and partnering with product, design and backend to turn ambiguous problems into measurable impact.

Experience

7 roles

Senior Experience Technology Engineer

Publicis Global Delivery (PGD) · Bogotá, Colombia · Hybrid

Oct 2023 — Present
- Lead front-end delivery for enterprise clients across Publicis Groupe, shipping React, Vue and Node.js features into production-grade pipelines.
- Architect reusable, accessible UI modules that shorten feature lead time and standardize patterns across multiple squads and brands.
- Integrate GraphQL and real-time WebSocket flows with cloud back-ends on AWS, Google Cloud and Azure, focusing on reliability and observability.
- Partner with product, design and QA to raise the quality bar: strict TypeScript, automated testing, Core Web Vitals budgets and WCAG 2.2 AA compliance.
- Mentor mid and senior engineers through code review, pair programming and architecture sessions.
ReactVueNext.jsTypeScriptNode.jsGraphQLWebSocketsAWSGCPAzure
Senior Frontend Engineer

DevSavant · Bogotá, Colombia · Remote

Jul 2021 — Aug 2023
- Designed scalable frontend architectures for SaaS products, introducing modular component libraries and strict design tokens.
- Drove performance optimizations across critical user journeys, reducing bundle size and improving Largest Contentful Paint on key pages.
- Established accessibility baselines (WCAG 2.1 AA) and embedded automated a11y checks into CI to prevent regressions.
- Mentored junior and mid-level engineers, running code reviews, tech-talks and internal workshops on React, testing and clean architecture.
ReactTypeScriptNext.jsReduxJestCypressTailwind CSS
Senior Software Engineer

Endava · Bogotá, Colombia · Hybrid

Dec 2020 — Aug 2021
- Provided technical leadership on modular frontend architectures for global financial and retail clients.
- Refined state-management patterns and CI/CD pipelines, shortening feedback loops and increasing release confidence.
- Partnered with architects and product owners to translate business rules into maintainable React and TypeScript components.
ReactTypeScriptReduxNode.jsJestWebpack
Senior Frontend Engineer

Globant · Bogotá metro area · Hybrid

Mar 2018 — Jul 2020
- Built and evolved component libraries used across multiple product squads, aligning design, engineering and accessibility standards.
- Profiled performance bottlenecks, applied code-splitting, memoization and asset optimization to improve time-to-interactive.
- Integrated front-end work into CI/CD pipelines, automating linting, testing and previews for every pull request.
- Contributed to Agile ceremonies and technical planning, scoping work and anticipating risks across sprints.
ReactAngularJavaScriptReduxSCSSJest
Senior Frontend Developer

Telintel · Bogotá, Colombia

Aug 2015 — Apr 2018
- Built internal tooling and customer-facing web applications for telecom services, focusing on usability and responsive design.
- Modernized legacy JavaScript codebases, introducing modular patterns and reusable UI components.
JavaScriptAngularHTML5CSS3PHP
Web Designer & Developer

1A Hosting · Remote

Dec 2008 — Apr 2018
- Delivered end-to-end websites for small and mid-sized businesses, covering design, front-end implementation and server administration.
HTML5CSS3JavaScriptPHPMySQLLinux
Web Designer

HostDime Global · Remote

Oct 2008 — Jan 2015
- Designed and built marketing and customer-portal interfaces for an international hosting provider.
HTML5CSS3JavaScriptjQuery

Skills & tooling

Frontend frameworks

React
Next.js
Vue
Angular
Astro
React Native

Languages & styling

TypeScript
JavaScript (ES202x)
HTML5
CSS3
Tailwind CSS
SCSS

State management

Redux
Zustand
Vuex
MobX
Context API

Backend & IoT

Node.js
Express
REST APIs
GraphQL
WebSockets
MongoDB
MySQL
C / C++
Embedded systems
IoT
MQTT

Testing & quality

Jest
React Testing Library
Cypress
Playwright
ESLint
Prettier

Cloud & DevOps

AWS
Google Cloud
Azure
Firebase
Docker
CI/CD
GitHub Actions

Craft & practices

Design systems
Micro-frontends
Accessibility (WCAG 2.2)
Core Web Vitals
PWA & Service Workers
Web security (OWASP Top 10)
Technical leadership
Mentoring

AI & augmented delivery

Prompt engineering
ChatGPT · GPT-4
Claude
Midjourney · DALL·E
LLM product flows
AI-assisted coding
AI for discovery & validation

UX & product design

Figma
UI/UX foundations
Prototyping
Design tokens

Certifications

13 · 251+ h

Active, verifiable continuous learning. Every 2025 credential links to the original Udemy certificate.

Certifications

13

2025 hours

251+

AI & prompt engineering

4

AI & prompt engineering

4

ChatGPT, Midjourney, ChatGPT 4 & DALL·E — The AI Bible

11h

Udemy · Dr. Ryan Ahmed · Stemplicity Inc.

Jun 2025 Verify

AI in Digital Marketing: Master ChatGPT & 100+ AI Tools

1.5h

Udemy · Victoria Rusnac

Jun 2025 Verify

Complete Prompt Engineering, ChatGPT & AI Bootcamp

35.5h

Udemy · Saad A

Jun 2025 Verify

ChatGPT Masterclass: The Guide to AI & Prompt Engineering

23h

Udemy · Robin & Jesper

May 2025 Verify

Frontend & web

3

The Web Developer Bootcamp 2025

74h

Udemy · Colt Steele

Mar 2025 Verify

The Creative HTML5 & CSS3 Course — Build Awesome Websites

13h

Udemy · Dev Ed · Maxine Tillman

Jan 2025 Verify

JavaScript Beginner Bootcamp (2024)

38.5h

Udemy · Rob Merrill

Jan 2025 Verify

Backend

1

The Complete Node.js Developer Course (3rd Edition)

35h

Udemy · Andrew Mead · Rob Percival

Jan 2025 Verify

Design & UX

1

Figma UI UX Design Essentials

12h

Udemy · Daniel Walter Scott

Feb 2025 Verify

Security

2

Learning the OWASP Top 10

LinkedIn Learning

Dec 2017

Developing Secure Software

LinkedIn Learning

Dec 2017

Business & strategy

2

AI for Business — AI Applications for Business Success

2.5h

Udemy · Horia Mărgărit MS

Apr 2025 Verify

Discover, Validate & Launch New Business Ideas with ChatGPT

5h

Udemy · Paul Nekh. · Olena T.

Apr 2025 Verify

Education

Bachelor's in Systems Engineering

Universidad del Tolima · Ibagué, Colombia

2001 – 2007

Languages

Spanish Native
English Professional working proficiency

Off the keyboard

Cycling
Music
Travel
Gaming
Pizza & craft beer

Let’s talk

I’m open to senior frontend, staff and lead roles — full-time or contract. Remote-first, compatible with LATAM, US and EU time zones.

@ Email oscarenas@gmail.com in LinkedIn /in/oscarenas gh GitHub @oscarenas ↗ Website resume-oscarenas.web.app