Available for new opportunities

Oscar Arenas

Senior Software Engineer · Next.js · Node · TypeScript · AI/LLM

14+ years shipping web products for global brands — now building AI-augmented experiences.

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

About

Senior Software Engineer with 14+ years shipping web products for global brands, now focused on building AI-augmented experiences. My core stack is Next.js, Node.js and TypeScript, with a strong frontend foundation in React, design systems, accessibility (WCAG 2.2) and web performance. On the AI side, I design and ship LLM-powered product flows integrating models via the OpenAI and Anthropic APIs, building conversational and generative features, and applying prompt engineering and structured outputs to make them reliable in production. I also use AI to move faster as an engineer AI-assisted coding, review and delivery without losing sight of clean architecture and maintainability. At Publicis Sapient I led front-end architecture for Fortune 500 clients and built component libraries adopted across 90 product squads. I lead cross-functional squads, mentor engineers on TypeScript, accessibility and performance, and turn ambiguous problems into measurable impact.

Experience

7 roles

Senior Technology Engineer

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

Oct 2023 — Present
- Build experience-led digital products for Fortune 500 clients across retail, finance and telco as part of Publicis Sapient's global delivery network.
- Led the front-end architecture for a North American sports league 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.
Next.jsTypeScriptNode.jsReactTailwind CSSGraphQLVercelJira
Senior Frontend Developer

DevSavant · Bogotá, Colombia · Remote

Jul 2021 — Aug 2023
- 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.
Next.jsReactNode.jsTypeScriptSupabasePostgreSQL
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 Developer

Globant · Bogotá metro area · Hybrid

Mar 2018 — Jul 2020
- Senior IC at one of LATAM's largest digital product companies (NYSE: GLOB), embedded in client teams across media, finance, telco and streaming.
- 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.
ReactJavaScriptNode.jsReduxCSS-in-JS
Senior Frontend Developer

Telintel · Bogotá, Colombia

Aug 2015 — Apr 2018
- 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.
JavaScriptAngularReactPolymerHTML5CSS3
Web Designer & Developer

1A Hosting · Remote

Dec 2008 — Apr 2018
- 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.
- Handled end-to-end delivery design, front-end implementation and DevOps/server maintenance.
HTML5CSS3JavaScriptPHPMySQLLinux
Web Designer

HostDime Global · Remote

Oct 2008 — Jan 2015
- Early-career web designer at a US-headquartered hosting company, building a foundation in HTML/CSS, design tools and web fundamentals.
- Handled server maintenance and server security alongside design work.
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
OpenAI & Anthropic APIs
Structured outputs
LLM product flows
ChatGPT · GPT-4 · Claude
Midjourney · DALL·E
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