Marcel Juenemann, Full-stack Developer in London, United Kingdom
Marcel Juenemann

Full-stack Developer in London, United Kingdom

Member since April 7, 2022
Marcel worked at Google for seven years as a senior software engineer and engineering manager. His role on Google Search for Android taught him how to develop scalable software for billions of users and lead projects across large organizations. Marcel is a generalist who can quickly learn new technologies. Through his management role, Marcel also discovered a passion for psychology, emotional intelligence, diversity, and inclusion.
Marcel is now available for hire


  • Google
    Android, A/B Testing, Management, Career Coaching, Leadership, DEI (Diversity...
  • Zalando
    Java, JavaScript, Angular, CSS, HTML5, Spring, PHP, PostgreSQL, Bootstrap...



London, United Kingdom



Preferred Environment

Linux, Google Cloud, Git, Google Apps

The most amazing...

...I've experienced is at Google when I collaborated with a few of Chrome's founding engineers. It was a great learning opportunity and a very humbling experience.


  • Senior Software Engineer

    2014 - 2021
    • Managed the team responsible for the web infrastructure of the Google App for Android. This infrastructure was on the critical path of billions of Google searches every day and supported tens of billions in annual revenue.
    • Led a rewrite of the Google App's Browser, which required an extensive refactoring of Chrome and involved working with senior directors from Chrome, search, and ads on a daily basis.
    • Improved load time of Google search result clicks by 3% through various optimization efforts. Worked with the ranking team to integrate page speed insights into the Google ranking.
    • Designed and implemented new features for internal sales tools (full-stack development).
    Technologies: Android, A/B Testing, Management, Career Coaching, Leadership, DEI (Diversity, Equity, & Inclusion), Java, Web Development, Angular, MySQL, Chrome Custom Tabs, Architecture, Full-stack
  • Software Developer

    2012 - 2014
    • Designed and implemented a configuration service for managing runtime configuration. This infrastructure was used by dozens of different teams and included a user-friendly front end that enabled assigning granular access rights.
    • Led the implementation of a PHP API for Zalando's eCommerce back end and guided an external front-end team on how to build an eCommerce shop using the API.
    • Bootstrapped the infrastructure for a new team by setting up the front end with Angular and Bootstrap, the back end with Java and Spring, and the database with PostgresSQL. The team grew to 50+ members and kept building on top of this architecture.
    Technologies: Java, JavaScript, Angular, CSS, HTML5, Spring, PHP, PostgreSQL, Bootstrap, Full-stack


  • Angular Drag & Drop library

    I built one of the most popular drag and drop libraries for Angular.JS 1.0. It supported complex nested lists and used the HTML5 drag and drop API. It gained over 2,000 GitHub stars and millions of npm downloads.

  • Google Search: Suggesting Related Pages

    I led the technical design and implementation of a new feature in the Google app for Android that suggests related pages to users while browsing through search results. This required close collaboration with the ranking team that was providing the back end and involved overseeing the launch process, including metric analysis.

  • Google Guava: Optimized Base64 Encoding by 70%

    Google Guava is one of the most used Java libraries globally and is used by all Java projects inside Google. I rewrote the BaseEncoding class, which made encoding over 70% faster and decoding over 60% faster. This class is used by thousands of projects inside Google and many more outside of Google.


  • Other

    Chrome Custom Tabs, Drag & Drop, Software Development, Full-stack, Leadership, Web Development, Software Architecture, Software Project Management, Architecture, A/B Testing, Optimization, Career Coaching, DEI (Diversity, Equity, & Inclusion)
  • Languages

    Java, JavaScript, CSS, HTML5, PHP, TypeScript
  • Frameworks

    Angular, Spring, Bootstrap
  • Paradigms

  • Platforms

    Android, Linux, Firebase
  • Libraries/APIs

    Google Apps
  • Tools

  • Storage

    PostgreSQL, MySQL, Google Cloud


  • Bachelor's Degree in Computer Science
    2009 - 2012
    Freie Universit├Ąt Berlin (FU Berlin) - Berlin, Germany

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