wir entwickeln software_

About us

We are cronn - a Bonn-based software development company with branches in Hamburg and Białystok, Poland. Software development is our passion. We trust in Java, OpenSource and, last but not least, in our experienced team. All of this we deploy to bring our clients software that is key to their business, or to professionally consult them in issues regarding architecture, tools or approaches.

Services

Product Development

You need a mobile or a web-based application that is not available as a standard solution? We support you throughout the entire process from brainstorming to the finished product. We develop the software agile with fast feedback cycles. We are the specialists for technology and support decisions constructively with critical questions and brilliant solution ideas. Lean Startup or Scrum? Both! When an MVP becomes a successful product, we can scale. We deliver a high-quality, ready-to-use product in the cloud and are available for maintenance and continuous further development.

Digitalization

You want to become more efficient and modern, exploit new potentials by integrating existing services, using artificial intelligence and complex automation? We support you by analyzing business models, data and requirements and questioning them logically and technically. We are constructive and provide excellent solutions. After the analysis we develop services or complete systems. We drive the process to the finished solution and do not leave our customers alone during maintenance. We develop agile and work at a fixed price.

Consulting

You need external resources, want to apply changes or need the advice of experts? We take over development work or advise you in questions of architecture and methodology. Our experienced employees always bring along an agile mindset, work practically and create value: On site (only Hamburg or Bonn) with highly qualified specialists in software development or the analysis of business processes and data. This makes your processes more agile, faster and of higher quality.

Maintenance

Are you looking for a reliable partner to maintain your systems? Of course we take over the maintenance of the solutions, which we have built, as well as of existing Java systems. For software, that we have developed, we can carry out small and large changes at a reasonable price - thanks to the agile procedure and automated tests. This allows you to continue using the software for a longer time while meeting also security and legal requirements.

Our References

Companies who put their trust in us

Our Systems

Our Methods

  • Agile

    Requirements change constantly, usually faster than you think. We're ready.

  • Testdriven

    Automated tests not only don't lie, they provide security for changes and are a solid base for continuous integration.

  • Continuous

    Things that are painful should be done more often - but not manually. Jenkins takes that off our hands.

  • CleanCode

    Programming languages were invented to find solutions to complex problems. That's what they should be used for.

Our Tools

die cronn GmbH entwickelt mit Java
Java

"The standard for efficient and stable server software."

die cronn GmbH nutzt Spring
Spring

"Has imposed and popularised dependency injection in the Java Enterprise field. Always one step ahead of JEE and all other competition."

die cronn GmbH setzt auf Hibernate
Hibernate

"JPA is the standard, Hibernate is the implementation - the most established solution."

die cronn GmbH lässt Jenkins arbeiten
Jenkins

"The standard for open-source continuous integration."

die cronn GmbH versioniert mit git
Git

"More than 65 millions of GitHub repositories and 24 millions of registered developers speak for themselves."

die cronn GmbH nutzt Sonarcube
SonarQube

"The data warehouse for software development, the cherry on the cake for Jenkins."

die cronn GmbH baut mit gradle
Gradle

"The best Java build tool. Fastest feedback thanks to incremental and parallel builds. Essential for continuous integration."

die cronn GmbH nutzt Docker
Docker

"In a container Software works on all devices equally."

die cronn GmbH nutzt Kubernetes
Kubernetes

"Automatic scalability and orchestration of containers."

Powered by AWS Cloud Computing
AWS

"Be global within minutes."

die cronn GmbH nutzt Typescript
Typescript

"All benefits without the problems of Javascript."

die cronn GmbH nutzt Cucumber
Cucumber

"The BDD-tool which combines specification and test documentation."

Locations

bonn
Bonn
Joseph-Schumpeter-Allee 23
53227 Bonn



+49 228 710 310-0
hamburg
Hamburg
Neue Burg 2
20457 Hamburg



+49 40 466 55 23-0

bialstok
Białystok
ul. Legionowa 28/609
15-281 Białystok



Our Team

Germany

Monika Barthelme

Business Analyst

Julia Bazanska

Graphic Designer

Michal Bazanski

Developer

Dr. Andreas Bella

Business Analyst

Frederik Bischoff

Business Analyst

Dr. Nicki Bornhauser

Business Analyst

Mikolaj Borzyszkowski

Business Analyst

Christian Brauchmann

IT Support Engineer

Stefan Cyriax

HR Business Partner

Eva-Maria Dargatz

Division Assistant

Nils von Delft

Developer

Jobst Eßmeyer

Managing Director

Hanno Fellmann

Developer

Mark Fischer

Developer

Rolf Groß

Developer

Tobias Hann

Developer

Paul-Fiete Hartmann

Developer

Gordon Hausmann

Business Analyst

Philipp Hirch

Developer

Riewert Holtermann

Developer

Sebastian Hoss

Developer

Christian Ingenhaag

Developer

Andrei Ivantsov

Developer

Philip Jelden

Business Analyst

Florian Kamella

Developer

Simon Kraschewski

Business Analyst

Fabien Kretzschmar

UI/UX Designer

Rolf Krüger

Developer

Robert Kucharczyk

Business Analyst

Sophie Küster

Business Analyst

Jörg Leisenberg

Director

Nils Lütkefent

Developer

Andrew McMechan

UI/UX Designer

Lars Merkel

Developer

Dr. Simon Merz

Business Analyst

Sandra Moll

Executive Assistant

Markus Müller

Developer

Dr. Patrick Niemann

Business Analyst

Matthias Richter

Developer

Florian Schmidt

Developer

Philipp Severing

Developer

Michael Vekens

Developer

Maurice Velte

Developer

Thomas Vöcking

Developer

Ralf Waldstein

Business Analyst

Benedikt Waldvogel

Developer

Kirill Wedenin

Developer

Gerhard Wesselink

Developer

Dr. Erik Wilbring

Business Analyst

Sven Zemanek

Developer


Poland

Jan Artysiewicz

Developer

Rafał Garbowski

Developer

Tomasz Gimbut

Developer

Paweł Kaczanowski

Developer

Łukasz Kakareko

Developer

Rafał Kojta

Developer

Kamil Kowalewski

Developer

Maciej Nowicki

Developer

Jakub Pogorzelski

Developer

Radosław Postołowicz

Developer

Stasiej Ruchlicki

Developer

Piotr Szumski

Developer

Jobs

We need reinforcements now!

If:

  • You achieve goals with others
  • Clean Code and Software Craftmenship are no foreign words to you
  • You are always on the lookout for improvements
  • You are fluent in speech and writing in German and English
  • You are open and willing to adapt
  • You are independent and responsible
  • but also like to challenge yourself and others
  • Enjoy writing tests just as much as productive code
  • But never take your eyes off the goal as you do
  • Enjoy refactoring
  • But prefer your computer doing your work for you...

... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools:

  • Spring (Boot/Cloud)
  • JAX-WS und JAX-RS
  • ReactJS, TypeScript, Webpack
  • Gradle, Git, SonarQube, Jenkins
  • JUnit, Cucumber, Selenium, testcontainers
  • MariaDB, Oracle, PostgreSQL, MongoDB
  • Docker, Puppet, Vagrant, Ansible
  • Amazon Web Services
  • Microservices, Micro Frontends

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A company car, a company phone and a job ticket
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.

Your responsibilities would include:

  • full stack or backend development with Java
  • development of business critical software solutions that fit the customer's needs
  • TDD, Pair Programming, Code-Reviews
  • collaboration in agile teams
  • share knowledge and experience
  • see the bigger picture

Too good to be true? Send us an email to and find out for yourself!

If:

  • You achieve goals with others
  • Clean Code and Software Craftmenship are no foreign words to you
  • You are always on the lookout for improvements
  • You are fluent in speech and writing in German and English
  • You are open and willing to adapt
  • You are independent and responsible
  • but also like to challenge yourself and others
  • Enjoy writing tests just as much as productive code
  • But never take your eyes off the goal as you do
  • Enjoy refactoring
  • But prefer your computer doing your work for you...

... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools:

  • Spring (Boot/Cloud), Hibernate/JPA
  • EJB 3.x, JAX-WS und JAX-RS
  • Gradle, Git, SonarQube, Jenkins
  • JUnit, Hamcrest, Mockito
  • MariaDB, Oracle, PostgreSQL, MongoDB
  • Docker, Puppet, Vagrant
  • Amazon Web Services
  • Microservices

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A company car, a company phone and a job ticket
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.

Your responsibilities would include:

  • backend development with Java with tiny bits of front end
  • development of business critical software solutions that fit the customer's needs
  • TDD, Pair Programming, Code-Reviews
  • collaboration in agile teams
  • share knowledge and experience
  • see the bigger picture

Too good to be true? Send us an email to and find out for yourself!

If You:

  • Enjoy developing Software
  • Are always on the lookout for improvement
  • Are fluent in speech and writing in Java, English and - ideally - German
  • Are open and willing to adapt
  • Are independent and responsible
  • But also like to challenge yourself and others
  • Enjoy writing tests just as much as productive code
  • But never take your eyes off the goal as you do
  • Enjoy refactoring
  • But prefer your computer doing your work for you...

... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools:

  • Spring, Hibernate/JPA,
  • EJB 3.x, JAX-WS, REST
  • Eclipse RCP, GWT or Vaadin
  • ReactJS, Bootstrap, JQuery, Javascript
  • Gradle, Git, SonarQube, Jenkins
  • JUnit 4, Hamcrest, Mockito
  • MariaDB, Oracle, PostgreSQL, MongoDB
  • Docker, Puppet, Vagrant

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and home office days
  • A modern office in central Białystok
  • Hardware and tools to match your expectations
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.

Too good to be true? Send us an email to and find out for yourself!

If You:

  • Enjoy analyzing complex systems
  • and you have proven this in your previous occupations
  • Are independent and responsible
  • Are a people's person
  • and like putting your observations to paper
  • Achieved a better-than-average degree in Computer Science, Mathematics, Physics or Electrical Engineering - bonus points for a PhD
  • Are well-organised and never let the goal out of your sights

...then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools and technologies:

  • Java, Object Orientated Programming and UML
  • DITA, Docbook or Markdown Languages
  • Relational Databases and SQL
  • Eclipse, git
  • JEE or Spring
  • Linux

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A company car, a company phone and a job ticket
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.

Too good to be true? Send us an email to and find out for yourself!

If You:

  • Have at least two years of experience as a Technical Lead in the Java field
  • or are confident that your experience as a Java developer would allow you to take up the part
  • Are fluent in speech and writing in German and English
  • Can confidently make decisions regarding architecture and design
  • and can convince your team and clients of your choices
  • Readily take up responsibilities
  • and are chomping at the bit to get things done
  • Consider yourself up-to-date with the latest technologies
  • but you're not too obsessed with technology

... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools and technologies:

  • Spring (Boot/Cloud)
  • JAX-WS und JAX-RS
  • ReactJS, TypeScript, Webpack
  • Gradle, Git, SonarQube, Jenkins
  • JUnit, Cucumber, Selenium, testcontainers
  • MariaDB, Oracle, PostgreSQL, MongoDB
  • Docker, Puppet, Vagrant, Ansible
  • Amazon Web Services
  • Microservices, Micro Frontends

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A company car, a company phone and a job ticket
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.


Your responsibilities would include:

  • Designing, implementing and introducing software for companies
  • Taking over project management from teams of developers
  • Understanding and analysing our clients' requirements, and translating them into software


Too good to be true? Send us an email to and find out for yourself!

If you:

  • Have at least two years relevant job experience in IT enterprise support
  • Don't consider continuous delivery and enterprise integration to be alien terms
  • Enjoy working with complex systems
  • Can fluently speak and write German and English
  • Enjoy getting to the bottom of problems
  • Are independent and responsible
  • Develop your own tools to provide better support
  • and not only in awk, for that matter
  • Work and think in a client-oriented manner
  • Are a people's person

... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools and technologies:

  • Linux, Shell Programming
  • Jenkins, Gradle
  • MySQL, PostgreSQL
  • Jira, Git
  • SonarQube, Jenkins
  • Docker, Puppet, Vagrant
  • Liquibase

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:

  • An experienced and skilled team
  • Interesting and challenging software development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A company car, a company phone and a job ticket
  • Opportunities to take part in conferences and engage with the Java community

... and, last but not least, an appealing contract.


Your responsibilities would include:

  • Maintenance of company software in a test and production environment within regular business hours
  • Getting to the root of problems - and solving them, where possible
  • Being a point of contact for partner systems
  • Servicing of incident management tools and processes


Too good to be true? Send us an email to and find out for yourself!

IF YOU:

  • Like to work towards goals as part of a team
  • Are skilled in the development of applications or software
  • Have experience in Application Design (UI), Visual Design and Interaction Design (UX)
  • Know what a website looks like and how it works
  • Can show us your portfolio
  • You are fluent in German and English
  • Are open and willing to adapt
  • Are independent and responsible
  • and don't lose sight of the goal

… ... then we want to get to know you.

When, on top of this, you can boast solid experience with a few of the following tools, frameworks and methods:

  • Wireframing
  • Design tools, e. g. Sketch
  • Prototyping, e. g. with InVision
  • Image processing, e. g. Photoshop
  • Mockups with HTML/CSS/JavaScript
  • Response Design
  • Agile Development, Scrum

... then we absolutely must get to know you!

We are certain we can convince you to work with us by providing:
  • An experienced and skilled team
  • Interesting and challenging development projects
  • Flexible working hours and Home Office days
  • Hardware and tools to match your expectations
  • A job ticket
  • Opportunities to take part in conferences

... and, last but not least, an appealing contract.


Your responsibilities would include:
  • You understand conceptual ideas and turn them into something useful and valuable
  • You advise customers and product owners in product design
  • You design workflows and experiences that feel simple and elegant
  • and cooperate with developers in HTML, CSS and JavaScript to implement them
  • You give feedback to your colleagues and help us to get better and better at what we do

Too good to be true? Send us an email to and find out for yourself!
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