Open to opportunities

Carlos Felix

@carlosfelix

Message

Senior full-stack software engineer and team lead focused on front-end excellence.

United States

Message

What I'm looking for

I seek senior engineering roles where I can lead front-end and full-stack initiatives, improve monetization, mentor teams, and deliver high-quality, test-driven production systems.

I am a Senior Full Stack Software Engineer and Team Lead with deep expertise in front-end web technologies and a strong track record in AdTech. Over a decade, I have led teams, built client-side ID systems, refactored critical ad tags, and contributed to open-source projects like prebid.js to improve performance and monetization.

At 33Across I drove initiatives across the development lifecycle, implemented a probabilistic user identifier for cookieless environments, developed client-side APIs for user IDs, and enhanced platform services including OpenRTB validation, GEO detection, blocklists, and privacy compliance (GDPR, CCPA, GPP, DAA).

I emphasize Test-Driven Development, code simplicity, and cross-team collaboration. I bring hands-on experience with modern JavaScript, TypeScript, Node.js, Golang, Docker, SQL databases, CI/CD, and observability tools, and I focus on delivering reliable, high-performing production systems that increase revenue and reduce technical debt.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

33Across

Jan 2015 - Sep 2025 (10 years 8 months)

Led development of cookieless user addressability and client-side ID APIs, built the company prebid.js ID system, and refactored the ad tag to improve performance and revenue for header bidding.

JavaScript TypeScript Prebid.Js MySQL PostgreSQL Docker TDD

Front-end Engineer Team Lead

Ooyala

Jan 2014 - Jan 2015 (1 year)

Led a value engineering team to build VPAID/VAST video prototypes and demos used by sales to win enterprise clients like Univision and beIN Sports.

AngularJS Backbone.Js React JavaScript TypeScript HTML5 CSS Prototyping

Front-end Engineer

Microsoft

Jul 2012 - Aug 2013 (1 year 1 month)

Implemented ad support and UI features for a web container in Skype, using responsive CSS and cross-domain iframe communication to include user data in ad requests.

Backbone.Js JavaScript HTML5 CSS Responsive Design AdTech UI Development

Front-end Engineer

Get Satisfaction

Jul 2011 - Jul 2012 (1 year)

Developed features for a customer support platform and designed a mobile web app for SSO login, integrating OAuth third-party authentication.

JavaScript Mobile Web OAuth SSO HTML5 CSS UX

Front-end Engineer

Freshout Agency

Oct 2009 - Jul 2011 (1 year 9 months)

Built dynamic user interfaces and JavaScript-driven solutions for activist-driven web projects, improving engagement and usability.

JavaScript HTML5 CSS UI Development Accessibility Prototyping

UI Developer (Contractor)

Yahoo Inc

Jun 2010 - Nov 2010 (5 months)

Contributed to the Yahoo Mail UI development as part of the team that shipped the 2011 interface update.

HTML5 CSS JavaScript UI Development

Full Stack Software Engineer

VMAL Ltd

May 2007 - Aug 2009 (2 years 3 months)

Developed and maintained client websites, performed SEO optimization and managed AdWords campaigns to improve site traffic and conversions.

PHP WordPress SEO HTML CSS

Full Stack Software Engineer

STX

Dec 2006 - May 2007 (5 months)

Developed ERP web modules for inventory, sales, finance and accounting to streamline business operations.

Web Development ERP Inventory Management JavaScript SQL

Education

Degrees, certifications, and relevant coursework

Instituto Tecnológico y de Estudios Superiores de Occidente

Computer Software Engineering

2002 - 2006

Completed a degree in Computer Software Engineering with coursework focused on software development and engineering principles from August 2002 to December 2006.