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  • Independent costing for the HVAC trades and coordination of costings from external partners
  • Coordination of the offer/project team as well as external project participants for the technical conception of the costing project
  • Elaboration of optimizations, saving potentials and special proposals
  • Conducting subcontractor inquiries together with the purchasing department
  • Pointing out opportunities/risks when handing over the order to the processing team or during order negotiations

Your Profile

  • Completed studies / technician / master craftsman in the field of supply engineering / building services engineering or comparable technical training
  • Ideally several years of experience in the calculation of building services installations
  • Expert knowledge in supply engineering, especially technical calculations
  • Good knowledge of the relevant DIN regulations
  • Good computer skills: CAD, Windows applications  
  • Ability to work in a team, creativity and willingness to act in an interdisciplinary manner in a planning team


Family Business

The performance of a large construction group combined with the advantages of a family business

Work safety

Work in a team that is second to none, especially when it comes to work safety

Company Culture

An open and direct company culture


You will receive an attractive, collectively agreed salary with special conditions

Well equipped

We provide you with all the materials you need to work well from day one

Company Car

We offer a prestigious company car (for private use also)

Supplementary company health insurance

Your health on the safe side: we provide you with supplementary company health insurance 

EGYM (Wellpass)

Company fitness that gets things moving - Your membership card that opens the doors to various fitness and sports centers all over Germany for you


Do you want to further your training? We will work with you to find the right opportunity 

Development meetings

We will hold regular development meetings with you to pave the way for your career at Mainka 

Working hours

The weekend is yours. We do not have regular weekend work

Mobile working

We equip you technically so that you can work well at home

Mainka Sozialfonds e.V.

Support, especially in difficult situations - please inform yourself about the Mainka Sozialfonds e.V.

Your first point of contact

Building the future with Mainka

Hello! I'm Saskia Zwake (Human Resources Officer) and your first point of contact when it comes to applying for a job. At Mainka, you can expect complex industrial construction projects with exciting tasks - and an owner-managed family business that is proud of the skills of its employees! Since we do most of the construction work ourselves, you will find a wide range of job opportunities with us.

Simply enter your details in our contact form and I will get back to you as soon as possible. I am also happy to receive your application by e-mail (please include all documents in a PDF attachment) or in the traditional way by mail. Or just give me a call! I will be happy to answer any questions, please do not hesitate to contact me. Me and our whole team would be pleased to welcome you to Mainka soon!

We are looking forward to receiving your application by mail or e-mail to:
Mainka Bau GmbH & Co. KG

Saskia Zwake | Darmer Esch 74 | 49811 Lingen
T: +49 591 80006-191 | M: +49 151 57132-191 | @