Crispy Mountain
Mainz (Deutschland) oder Remote

We are Crispy Mountain, a team of young, motivated and ambitious 
 software experts based in Mainz, Germany, and throughout Europe. Our key principles are: Simplicity, Focus and Efficiency.

For our ambitious goals we are searching for SENIOR RUBY/RAILS DEVELOPERS 
 (Remote or Mainz, Germany)


We are currently building an open software platform for the print media industry called HEI.OS. Our vision is to create a future where every print related processes world-wide will run on a central industry platform.

It will be the only existing open platform that engulfs an entire industry. From designers and publishers to printers and machines to trucks and logistics – it's truly holistic.

It is our job to design and build the foundation services for this platform, as well as documentation and developer resources. Our responsibilities include process design, product design, UI/UX, implementation and operations as well as marketing and general strategy.


Our usual tech stack looks like this: Ruby on Rails, Go (sometimes), Heroku, AWS, Postgres, RabbitMQ, Kafka, ...

We prefer the Rails-no-bullshit-approach. Our main objective is to build and ship stable applications, that solve real-world problems for our users. We are using tools, libraries and technologies where and when it makes sense. We don't use stuff just for the sake of using it. Productivity and reliability is key. We use tools that fit the task, and are not bound by ideologies.

In addition to the technologies above, we use the usual suspects for CI/CD and communication: CircleCI, Github, Basecamp, Slack, Zoom / AppearIn


As a senior developer it is your job to oversee and implement parts of the foundation services we talked about earlier. Since we build a "macro"-services (somewhere between die-hard micro service and monolith) architecture, there are many interesting independent projects to choose from. You would take over the responsibility for one of these projects and work closely with our CTO in making it happen.


Our challenge is a big one: we are tasked with building a platform that will change the face of an entire industry. Forever. We don't solve Silicon Valley-style self-made, first-world problems – we actually want to fix software problems in the printing industry, freeing the people working there from stupid, repetitive, cognitive assembly line work and allow them to rediscover their creativity.

You will enjoy a great deal of freedom in your work (which can also be a burden). Not gonna lie, we are a small team at this point, which will grow over time (again not explosively, but sustainably), so at first your job will be hands-on, while in the future it can shift more towards project lead and management (if this is your desire). Either way, your work will have an impact on our success!


Millions of print products are produced every day – from flyers to books to packaging, and more. Print has been one of the major catalysts of human creativity as well as social and scientific advancement, and it is one of the oldest crafts around. If you've ever heard "print is dead" – that's about as true as the rumors of the death of the email and newsletter or the fairy tale of teleportation. But of course, print businesses need to optimize their processes to the max – and we are here to help them do that.

In the last 20 years the software landscape and processes around creating and manufacturing a print product have been somewhat stagnant. Leaving printers with: bad processes, bad UI/UX, no automation and repetitive, inhumane data- entry tasks. These are a major burden for many employees in the print media industry.

We want to change all that.

We build modern software for the print media industry. We started with Keyline – a highly innovative, holistic ERP system for printing houses – and will now shoot for Mars by building an open platform where print media software vendors can run their applications: think Amazon AWS, but tailored to the print industry and on a higher level than simply infrastructure.

All of this is backed by Heidelberg Druckmaschinen AG, the biggest print equipment manufacturer in the world, with more than 100 years of history. Heidelberg has recently acquired Crispy Mountain, in order to combine the excitement of a young and agile team with the knowledge and tradition of one of the oldest brands in print.

Together we will tackle the incredibly exciting mission ahead.

Interested? Write an email to Oliver Schopp ( with a short and convincing cover letter. Oliver will also be happy to reply to any of your questions you might have beforehand.

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