How to apply for Technischer Zeichner HLS (m/w/d) - 1KOMMA5° Handwerk - Remote

About 1KOMMA5°

1KOMMA5° builds the Heartbeat energy software platform, which connects solar panels, batteries, heat pumps, and charging stations into a virtual power plant. The company also offers a one-stop shop for buying and installing clean energy systems, aiming to make homes carbon-neutral. Working here means contributing to both hardware planning and software-driven energy optimization.

About the role

As a technical drafter for HLS (heating, ventilation, sanitation), you create plans for heat pump systems in single- and multi-family homes. You perform heating load calculations, size components, and produce execution documents. You act as the interface between sales, project management, and installation teams, directly impacting how quickly and accurately clean heating systems are deployed.

A typical day

You start by reviewing new project requests and performing heating load calculations for upcoming heat pump installations. Later, you draft schematics and material lists, then coordinate with sales or installation teams to clarify technical details. You might also spend time refining planning templates or discussing improvements with colleagues.

Who 1KOMMA5° is looking for

• Completed training or degree in building technology, HVAC, or a related field.
• Experience with heat pump planning, including heating load calculations per DIN EN 12831.
• Ability to size heat pumps, buffer tanks, and heating surfaces.
• Strong coordination skills to work with sales, project leads, and installers.
• Familiarity with creating schematics, bills of materials, and material lists.

Tips for this application

• Highlight any hands-on experience with heat pump systems or renewable heating projects in your resume.
• Mention specific software you use for technical drafting (e.g., AutoCAD, CADmatic, or similar) and for heating load calculations.
• Show that you understand the interface role: give examples of coordinating between different teams (sales, installation, etc.).
• Reference DIN EN 12831 explicitly if you have applied it, and describe the scope of calculations you performed.
• Since the role is remote, demonstrate your ability to work independently and communicate clearly in a distributed team.

What to cover in your cover letter

Emphasize your experience with heat pump planning and heating load calculations. Explain how you have acted as a liaison between technical and non-technical teams. Mention your ability to create clear execution documents like schematics and material lists. Show interest in contributing to standardized planning processes.

Research before applying

• Learn how the Heartbeat software works and how it integrates with heat pumps and other home energy systems.
• Understand 1KOMMA5°'s one-stop shop model: what services they offer and how planning fits into the customer journey.
• Check recent news or projects about 1KOMMA5°'s expansion or technology partnerships.
• Review the DIN EN 12831 standard if you are not fully familiar with it, as it is central to the role.

Likely interview topics

Based on the job description, expect questions about:

• Walk us through a heat pump system you planned from start to finish. What calculations did you perform?
• How do you ensure accuracy when sizing heat pumps and buffer tanks for different building types?
• Describe a time you had to coordinate between sales and installation teams. What challenges arose?
• What tools do you use for technical drafting and heating load calculations?
• How would you approach developing or improving planning standards for heat pump installations?

Common mistakes to avoid

• Submitting a generic application that does not mention heat pumps or heating load calculations.
• Failing to show how you have worked across departments (sales, project management, installation).
• Ignoring the remote aspect: not indicating how you stay organized and communicate in a remote setup.