Commercial Assistant to the Site Management (m/f/d) in Idar-Oberstein

Our Mission

We believe that construction can be a positive experience. We are the HAHN BAU GRUPPE, comprising BauTeam Hahn GmbH, Hahn Bau GmbH, Hahn Immobilien GmbH, and PG Neue Mitte Weilerbach GmbH. We plan, build, renovate, and refurbish—thoroughly, holistically, sustainably, and all from a single source. Because joy shapes visions.

Our Challenge

We are a sustainable family business that has grown significantly in recent years. Our clients include industrial and commercial enterprises as well as public sector clients with specific requirements for their construction projects. Our revenue has increased substantially, and our team has grown significantly within just a few years—today, we have around 80 employees.

Kerstin Schneider HR Department bewerbung@hahn-bau-gruppe.de Write to us at Hahn Service GmbH Hommelstraße 2 55743 Idar-Oberstein Phone 0 67 81 - 93 29 5 - 0 Fax 0 67 81 - 93 29 5 - 99

Our Mission

We believe that construction can be a positive experience. We are the HAHN BAU GRUPPE, comprising BauTeam Hahn GmbH, Hahn Bau GmbH, Hahn Immobilien GmbH, and PG Neue Mitte Weilerbach GmbH. We plan, build, renovate, and refurbish—thoroughly, holistically, sustainably, and all from a single source. Because joy shapes visions.

Our Challenge

We are a sustainable family business that has grown significantly in recent years. Our clients include industrial and commercial enterprises as well as public sector clients with specific requirements for their construction projects. Our revenue has increased substantially, and our team has grown significantly within just a few years—today, we have around 80 employees.

Now it is time to structure, optimize, and consolidate. To this end, the HAHN BAU GRUPPE is centralizing services for clients and employees under one roof—and we are redistributing responsibilities for key positions. You can help us with this!

Your Role & Profile

We Are Looking For a Commercially Trained Professional With a Technical Aptitude To Provide Reliable Support To Our Construction Management Team In Organization, Correspondence, And Documentation. An Overview Of Your Tasks

• Managing your construction site (project and site organization)




• Supporting the site manager with the organizational execution of construction projects




• Maintaining and managing project files—both digital and physical




• Creating and managing construction site documentation




• Coordinating appointments, meetings, and site visits




• At home on the phone and in writing (correspondence and communication)




• Correspondence with clients, architects, specialist planners, and subcontractors




• Processing incoming and outgoing mail and handling telephone communication




• Drafting cover letters, reports, and minutes




• Sending out tender and contract documents, and following up on open inquiries




• Keeping an eye on the numbers (invoice and change order management)




• Checking incoming invoices for completeness and forwarding them to the relevant site managers




• Monitoring payment deadlines




• Support in creating and managing change orders




• Maintaining change order and invoice logs




• Contracts under control (contract and document management)




• Management of construction, subcontractor, and supplier contracts




• Monitoring contract terms and deadlines




• Documentation of contract amendments and archiving of all project documents




• Supplies organized (materials and procurement)




• Obtaining and comparing quotes, preparing award decisions




• Creating and processing orders, monitoring delivery dates




• Coordination with suppliers and subcontractors, processing delivery notes




• Budget in sight (cost and controlling support)




• Maintaining cost summaries and project budgets




• Support with budget-to-actual comparisons and reports for project management




• Monitoring cost trends, support with monthly performance reporting




• Never miss a thing (schedule and deadline control)




• Monitoring project schedules and maintaining deadline lists




• Reminders for important submission deadlines




• Support in tracking subcontractor schedules




• Quality documented (quality and documentation management)




• Management of test reports, acceptance documentation, and lists of defects and remaining work




• Compilation of as-built documentation




• Documentation of site inspections and handovers




• Support in creating and maintaining samples for quality assurance requirements

The Team

You primarily ensure smooth operations behind the scenes – together with me, Lukas D., and Lukas F., you will prepare construction sites and improve planning. – Andreas

Your Qualifications

• Commercial vocational training with at least two years of professional experience




• Excellent knowledge of MS Office products




• Excellent written and verbal communication skills in German and English




• Basic technical understanding, ideally with experience in the construction industry




• Knowledge of construction management software (AVA) or cost estimation is an advantage

What We Offer

Our family-like working environment is defined by mutual respect, humor, and sustainability.

We Also Offer

• Permanent employment contract




• Flexible working hours / flextime




• JOBRAD bike leasing




• Professional development and further training opportunities




• Company mobile phone and laptop for a modern, digital workplace – from communication and digital time tracking to project management, vacation planning, and payroll




• Team events, e.g., our annual summer party




• Short decision-making paths and flat hierarchies as a family-run business

Diversity is important to us: While our team is currently predominantly male, we would be thrilled to become more diverse and welcome more women to our team.

Your application documents

Note: For this position, a successful security clearance by the client (U.S. Armed Forces) is a prerequisite for working on-site. We are happy to discuss the details in a personal interview. To get to know you better, we look forward to receiving your cover letter including salary expectations, your CV with references regarding your previous areas of responsibility, and your most recent employment references – by August 31, 2026, via email to bewerbung@hahn-bau-gruppe.de, addressed to Kerstin Schneider. She is also happy to answer any questions by phone at +49 6781 93295-0.

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