Max Hollmann, Deep Learning Developer in Berlin, Germany
Max Hollmann

Deep Learning Developer in Berlin, Germany

Member since March 4, 2016
For several years, Max had been mainly working as a back-end developer until fairly recently, where he now specializes in data science and deep learning. His projects have ranged from MVPs on tight budgets to full-blown products. He is passionate about using technology to make a real impact on businesses and the world and is always looking to expand his skill set for doing so.
Max is now available for hire


    Python, Machine Learning, Chef, Sidekiq, Ruby on Rails (RoR), Ruby...
    Heroku, PostgreSQL, Ruby on Rails (RoR), Ruby
  • Relodeck
    Push Notifications, Heroku, Memcached, PostgreSQL, Ruby on Rails (RoR), Ruby



Berlin, Germany



Preferred Environment

Git, Emacs, Unix

The most amazing...

...web app I've built uses NLP and machine learning to find out who got interviewed on a podcast episode—building a people-centered podcast directory.


  • Lead Developer

    2015 - PRESENT
    • Developed a podcast directory and scaled it to 2.5 million episodes and 800,000 interviewees.
    • Employed an NLP model to extract names of people appearing on the podcasts and a generalized linear model to categorize the type of appearance.
    • Implemented a system to process new data from thousands of podcasts in parallel using Sidekiq.
    • Set up an Elasticsearch server to support fast and powerful searches.
    • Managed the server infrastructure on DigitalOcean using Chef.
    Technologies: Python, Machine Learning, Chef, Sidekiq, Ruby on Rails (RoR), Ruby, Elasticsearch, Luigi, Natural Language Processing (NLP)
  • Consultant

    2015 - 2016
    • Improved the quality of the existing code base and database design, and established sustainable design patterns for future development.
    • Implemented a complete redesign of the front-end with better responsiveness and all-around user experience.
    • Created a report system for the outcomes of online votings and the demographics of the voters, both as HTML and as CSV.
    Technologies: Heroku, PostgreSQL, Ruby on Rails (RoR), Ruby
  • Lead Developer

    2013 - 2016
    • Provided technical guidance from the startup's idea to its first big clients.
    • Implemented the back-end and API of a complex CMS/CRM solution.
    • Set up a reminder service using push notifications, interfacing directly with the Apple Push Notification Service and Google Cloud Messaging.
    • Coordinated the development of the iOS and Android apps.
    • Interviewed and screened mobile app developers.
    Technologies: Push Notifications, Heroku, Memcached, PostgreSQL, Ruby on Rails (RoR), Ruby
  • Web Developer

    2011 - 2011
    Empuxa GmbH
    • Implemented a platform giving patients the chance to rate their care providers on various criteria.
    • Implemented a Facebook app for a customer support software to add a channel of communication between companies and their clients.
    Technologies: Facebook, Amazon Web Services (AWS), MongoDB, Ruby on Rails (RoR), Ruby
  • Developer

    2009 - 2009
    • Developed a tool to visualize the accuracy of the company’s 3D reconstruction software.
    • Implemented a library to convert MPEG4 videos into single frames.
    Technologies: Video Processing, Image Processing, FFmpeg, C++


  • Podify

    A web application to convert YouTube videos into podcast episodes that I built to scratch and used as an opportunity to play around with dry-rb. The back-end runs on Ruby on Rails with a GraphQL API and the front-end is a Vue application with live progress updates via WebSockets (ActionCable).


    A side project to scratch my own itch, provides an interface to YouTube that is suitable for parties—search for songs, queue them in the playlist, and play them all from one page. Given that design is not my area of expertise, I'm quite happy with how the interface turned out.


    A joint initiative with a friend who was backpacking in Australia. With the aim of mitigating the widespread problem of employers taking advantage of backpackers, we developed a platform where travelers can share their experience with previous employers. The website is slowly gaining steam by word of mouth and being consulted by more and more travelers looking for short-term work every day.

  • Ruby Gem: Rails API Explorer

    A plugin for Ruby on Rails that lets developers easily create API documentation, including an interactive interface to test and play around with the API.


  • Languages

    Bash, R, Python, Ruby, CoffeeScript, JavaScript, Sass, Haml, HTML5, CSS, HTML, ECMAScript (ES6), SQL, C++, CSS3, Java, GraphQL
  • Frameworks

    Ruby on Rails (RoR), Slim, Capybara, Bootstrap 3, Bootstrap, Vuetify, ActionCable
  • Libraries/APIs

    REST APIs, Sidekiq, jQuery, ActiveRecord, Ruby on Rails API, Node.js, Keras, TensorFlow, Luigi, Vue, Google Maps, Twitter API, Facebook Open Graph API, FFmpeg, Ractive.js, D3.js, React
  • Tools

    Git, Emacs, RSpec, GitHub, TensorBoard, Apple Push Notifications, Google Cloud Messaging, NGINX, MATLAB, Chef
  • Paradigms

    Agile Software Development, Test-driven Development (TDD), Data Science, Object-oriented Design (OOD), Plain Old Ruby Object (PORO)
  • Platforms

    Linux, Unix, Heroku, Amazon Web Services (AWS), DigitalOcean
  • Storage

    JSON, PostgreSQL, Databases, Memcached, Redis, MongoDB, Elasticsearch
  • Other

    Machine Learning, Deep Learning, Statistics, Image Processing, Video Processing, Push Notifications, Facebook, Natural Language Processing (NLP), WebSockets, Dry-rb, Artificial Intelligence (AI)


  • Master of Science Degree in Statistics and Data Science
    2016 - 2018
    Leiden University - Leiden, Netherlands
  • Bachelor of Science Degree in Psychology
    2011 - 2014
    University of Groningen - Groningen, Netherlands

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