Herr Kraatz macht Apps.
React Apps
Hybrid Apps


Please find my services here.

React Web Apps & Cordova Hybrid Apps

React is fun! And Redux helps keeping the state (data) of your site consistent. For superfast first loading let's use SSR (Server Side Rendering). If you need an installable app instead (iOS & Android), think of hybrid, one-code-base solution Cordova (JavaScript/Angular/Ionic). It will do in > 90% of all use cases. If you need real native developers I can ask my network.

Collaboration Network

Without constant input from professional communication folks my app projects would have ended in a dead end pretty soon. And it is fun working with them! Please contact me and I'd be glad to get you in touch with 3 internationally operating agencies in Berlin and Munich area. And if you need smart and cost-saving development and test support from Remote-Siberia (really remote !) please also let me know. These guys are amazing in .NET, Java, Testing, and native Android:
Digital Mind Development Krasnoyarsk / Siberia

Responsive Design

Being responsive will raise your conversions as you help users find their way. Just one template for smartphone, tablet, and desktop lowers your development costs.

Backend as a Service (BaaS)

Choosing a BaaS makes your application scalable and usually decreases downtime. Save maintenance and security costs. I can help choosing the one closest to your needs and setting it up.

Web Analytics

Content is king. But new sites and apps are in danger if your legacy sites/pages are still online, but neglected or out of date. Let's also take care of that.

Project Management

Modern tools like leankit for kanban enable teams to visualize their work in progress, identify bottlenecks, and deliver releases on time. But motivation, trust, and fun are the key. I can drive your project.

System Analysis

You have a big migration or integration project in front of you? Take your time in analyzing all connected systems and workflows. And come to an agreement about the requirements with all of your stakeholders. I can assist you.

Brainstorming Sessions

Please also invite me for concepting sessions, defining the MVP and target audience, or just to have a coffee or beer and get to know each other (this would be my party of course).


Take advantage of my experience in wholesale, retail, online-banking, business consultancy, telecommunications, and, of course, software and app production.

App Portfolio

Apps and ideas

Marry Harry

International Romance

Conny & friends

A cartoon messenger app - WIP

App ideas

What do you think?


Send charming picture messages.

iCal Sync

Web app to avoid overbookings - WIP


Find new lunch partners.


A summary of the last 16 years.

  • 2002-2005

    Software Developer

    ASP 3.0, T-SQL, SQL Server, HTML Developer
    (1 year)
    C#/.NET Remoting, PL-SQL Developer using Oracle 9i, UML
    (2 years)
    DMS Software Livelink (OpenText), Developer & Co-Admin
    (1 year)
    CRM Software SalesLogix (Sage), Developer & Admin
    (1 year)

  • 2006-2007

    System Analyst Data Warehouse

    Creating software design specifications for a new financial reporting and billing process after the merger of Sprint and Nextel.
    Proposals and presentations were worked out in cooperation with departments of Finance, Data Warehouse, Infrastructure and Production Support.
    (1 year)

  • 2008-2011

    Technical Lead Freelance Projects

    Implementing a Web Analytics Executive Dashboard for 20+ sites using Piwik, SQL-Server 2008, ASP.NET Frontend (C#, MVC)
    (6 months)
    Migration of client’s Alumni web portal to a new service provider
    (6 months)
    Magento eCommerce Plaform setup and client's product data import
    (3 months)
    Human Resources and Customer Relationship integration projects
    (6 months)

  • 2012-2013

    EBIT, ROI, Cash flow & Break (not even)

    Creating a Sales Exposé for a company in plastics industry.
    The price of the company was determined using a mix of gross rental method and multiplier method while analyzing the EBITs of the latest three years and trying to forecast the following 5 years.
    A share deal was preferred over an asset deal.
    (6 months)
    Taking a break for speeding down and new ideas.
    (1 year)

  • 2016


    Frontend Development

    Due to a confidentiality agreement I cannot give details here.
    (6 months)

  • Since 2014

    Herr Kraatz macht Apps.

    Design and production of Marry Harry - International Romance, available on iOS and Android.

    Design and production of Lunchhopper - Find new lunch partners, available on iOS and Android.

    Design and production of SUPERBUDDY - Send charming picture messages, available on iOS and Android.

    Development of Conny & friends - A cartoon messenger for children, will be available on iOS and Android. Work in progress.

    Development of iCal Sync - Web app to avoid overbookings, will be available in all major browsers (desktop & mobile). Work in progress.

  • Back


Holger Kraatz


In 2000 I first got in touch with IT business - during my internship in a consulting company in Virginia - and immediately became passionate about programming. That's why I started in this industry after finishing my studies in Industrial Engineering and Management. And never regretted this focus on technology.



Herr Kraatz macht Apps.

c/o betahaus GmbH
Prinzessinnenstr. 19-20
10969 Berlin

+49 (0)151 2015 2224
service (bei) herrkraatz (punkt) berlin