JavaScript Engineer II



Software Engineering
Mexico City, Mexico
Posted on Thursday, April 6, 2023

GumGum is a contextual-first, global digital advertising platform that uses advanced AI technology to serve captivating creative ads that drive consumer attention, without the use of personal data. At GumGum, we don’t need to know who you are to deliver relevant and engaging ads that align with your active frame of mind. We believe that a digital advertising industry based on context rather than personal data builds a more equitable and less invasive future for the internet and is better for consumers, publishers and advertisers alike. Our blueprint for the future, The Mindset Matrix™, combines the power of context and creative in digital advertising to deliver superior attention and drive consumer action without sacrificing personal data.

To be a part of this next phase of digital advertising that prioritizes data privacy, please visit

The JavaScript Engineer will build and maintain our main ad server client that is used on thousands of publisher sites. This is not a UI focused position. This position will support the business of Ad Server core integration.

The role demands skill at writing both vanilla JavaScript and using new libraries and packages. It uses ES6, transpiling, and modern JavaScript build and deployment tools. This engineer will work in a highly collaborative environment, sharing, and contributing to the team’s collective knowledge, processes and code implementations.

Note: GumGum currently operates in a ‘work from home’ virtual environment with sporadic opportunities for in-person business and morale events (health guidelines permitting). There will not be any requirement to go into the office on a daily basis moving forward.

What You'll Achieve

  • Design, develop, and maintain new features and improvements for GumGum’s JavaScript code.
  • Implement tests, ensuring proper functionality and graceful degradation on multiple browsers
  • Support and troubleshoot implementations of our scripts on publisher sites
  • Collaborate with a variety of internal teams
  • Contribute to FOSS codebase
  • Mentor other team members in advanced JavaScript patterns and coding practices

Skills You'll Bring

  • BS in Computer Science or equivalent work experience
  • At least three years of JavaScript experience
  • Extensive knowledge of Web technologies like HTTP(S), HTTP/2 protocol, CDNs, and server-side cache techniques
  • Extensive experience working directly with the DOM/BOM, CORS
  • Cross-frame communication, IAB SafeFrames, and code injection and execution.
  • Knowledge of HTML5 and CSS3 features, polyfills and graceful degradation
  • Experience with Cross-browser compatibility and browser developer tools
  • Experience with embedded 3rd party scripts
  • Experience with Git and CI/CD pipelines
  • Test-driven development
  • Ad Industry experience a bonus
  • Core understanding of JavaScript, including ES6 and modern building tools and working in a JS-framework free environment
  • Strong communications skills
  • Comfortable with working remotely and collaborating with overseas teams
  • Ability to step into a foreign JavaScript environment (publisher) and diagnose and solve problems
  • This engineer wants to see their work operate across the vast publisher ecosystem of the internet

Benefits & Perks

  • Medical, Dental and Vision Coverage including 100% premium coverage for employee + spouse/family
  • Life Insurance, AD&D and TPD
  • Retirement contributions
  • Short-Term Disability and Short-Term Sickness
  • Work From Home and Wellness Stipend
  • Initial 12 Days PTO of vacation with 1 additional day per year up to a cap of 15 days + 5 sick day
  • Employee Assistance Program
  • GumGum Gives Back volunteering/social impact opportunities
  • Virtual and in-person company events/celebrations
  • Anniversary recognition and awards
  • Modern Family Support and Resources


  • BuiltIn #37 Best Places to Work 2023 across the United States
  • BuiltinLA #7 Best Places to Work 2022
  • BuiltinLA Best Places to Work 2021
  • Ad Exchanger Programmatic Power Player 2022 and 2021
  • Digiday Media Awards Europe finalist 2022 and 2021

GumGum is proud to be an equal opportunity employer. At GumGum, we believe in cultivating an environment where our team members can bring their authentic, whole selves to work. Encouraging identity and belonging is one of the many aspects of our culture that makes us stronger as an organization and drives innovation. We are committed to building and delivering a diverse, inclusive, and equitable workforce that is representative of the world around us, where all individuals are treated with respect and dignity - and to act swiftly if this value is ever threatened. We are constantly striving to be better, and we continue to take strategic steps to advance representation. - Phil Schraeder, CEO

Learn more about our DEIB programming at

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