Industrial furnace construction – an industry that leaves no one cold

Heat treatment is an important prerequisite for numerous products, e.g., carbon fibers, electric car batteries, or (razor) blades. ONEJOON develops the necessary furnace and process technology. Over 125 years of experience in industrial furnace construction, precise engineering and design work, and the spirit of a down-to-earth plant manufacturer set us apart. As a global technology leader, we are represented at 10 locations in 6 countries worldwide. The #onejoonfamily comprises almost 400 employees worldwide, 200 of whom are based at two locations in Germany, where they perform a wide range of tasks in a dynamic and future-oriented environment.

Software Developer / PLC Programmer (m/f/d)

As Software Developer / PLC Programmer (m/f/d) you can expect many exciting and challenging tasks with an international context at our Bovenden or Böblingen site.

Verifying input data for completeness and correctness, including feedback
Creating and further developing software modules in Siemens TIA Portal (SCL & KOP)
Creating and adapting WinCCUnified user interfaces
Implementing specifications from functional descriptions and flowcharts
Performing application customizing and software installationsCreating checklists and complete technical documentation
Creating checklists and complete technical documentation
Collaborating on virtual and real commissioning as well as FAT
Basic parameterization and diagnosis of converters
Integration and basic parameterization of thyristor controllers
Contributing suggestions for improvement to standards and development processes
Assuming module responsibility in projects

We are a good match if you

have a degree (bachelor's/master's) in computer engineering, mechatronics, electrical engineering, or automation technology, or a technician's degree (state-certified) in one of these fields, with relevant practical experience,
have at least 3 years of professional experience,
have advanced knowledge of the Siemens TIA Portal, WinCC Unified, and common drive technology tools, as well as
advanced knowledge of MS Office,
very good German skills (C1/C2) and advanced English skills (B1/B2),
are willing to travel,
value initiative and independent work,
have strong organizational skills, resilience, and a willingness to learn, be talented at improvisation and able to react flexibly to new situations, and
have a strong customer- and service-oriented approach to work.
have a high level of technical responsibility and commitment,work in an analytical and structured manner,
show initiative and a solution-oriented approach,
are willing to learn and develop,
can communicate clearly and objectively,
are a strong communicator and team player with strong interpersonal skills,
can convey technical issues in an understandable way,
approach problem and damage analysis systematically,
have strong organizational and prioritization skills,
and naturally adhere to deadlines and quality standards,

... then we could complement each other well.

Development Outlook:

With the appropriate experience and personal aptitude, this position offers a clear path to advancing to a technical lead role in the field of PLC software. In this role, the employee will be responsible for designing software architecture, establishing standards, and conducting reviews; supporting the onboarding of new developers; and gradually assuming responsibility for the technical quality of our automation software.

This is what you can look forward to:

Teamwork and mutual support (Teamwork makes the dream work!)
Targeted qualification measures and promotion of professional development
Family-friendly thanks to various working time models and mobile work
Company pension scheme
Company health management
Other benefits: free parking spaces, height-adjustable desks, canteen, meal allowance, free coffee, tea and water (fresh fruit is also available), bike leasing, ONEJOON employee discounts

Our job offer Software Developer / PLC Programmer (m/f/d) sounds promising? Then we look forward to receiving your application.

Do you have any initial questions for us or about the job?
Please contact Bjoern Fabig | Senior Human Resources Officer (Tel. ) or by e-mail to:

We therefore welcome applications from everyone – regardless of gender, nationality, ethical and social background, religion and ideology, disability, age and sexual identity. For reasons of better readability, we use the masculine form when referring to persons and nouns in our job advertisements. In the interests of equal treatment, however, these generally apply to all genders and this form of language is used solely for editorial reasons. Qualified persons of all genders are therefore expressly invited to apply.

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ONEJOON International