David Hellmer

About

About

I build control systems, and lately I build software the way I was trained to build control systems.

Short bio

David Hellmer is an engineer, DJ and entrepreneur in Dallas–Fort Worth. Trained at the U.S. Navy's Nuclear Power Training Command, David spent two decades in building automation and low-voltage systems, from field technician to building automation department head, and has founded businesses including a freeze-dried food manufacturer grown to national distribution. In 2025 David founded HLLMR Ventures, building software with AI coding agents, and has been DJing for thirty years.

For introductions and press · third person

Name
David Hellmer
Based
Dallas–Fort Worth, Texas
Work
Founder & Principal Engineer, HLLMR Ventures; Senior Applications Engineer, Building Automation Systems, Enviromatic Systems
Trained
U.S. Navy Nuclear Power Training Command
Field
Building automation, low-voltage and OT systems; applied AI and software
Off hours
DJ, for thirty years
Elsewhere
linkedin.com/in/dhellmer · more

In my words: I build engineering capability.

The people, standards, software and delivery practices that help teams solve hard problems in physical systems. My career spans more than twenty years across building automation, low-voltage systems, mission-critical facilities and business ownership. I have worked every part of it: field installation and programming, project management, engineering, estimating, sales support and department leadership.

It started in the Navy's nuclear power program, where you assume nothing works until you have watched it work. Then security and fire systems, then building automation, commissioning and the engineering behind it. I have established and led a building automation division, and built a manufacturing business to national distribution, more than $1M a year and a team of twelve.

Buildings where failure is not an option.

  • High-containment laboratories
  • Government and intelligence-community data centers
  • SCIFs
  • Hospitals
  • Airports
  • An FAA air route traffic control center
  • Industrial facilities

Those environments taught me to define the expected behaviour, verify the actual system and keep the evidence of what happened: the commissioning discipline that proves a building does what the drawings say.

Applied AI, with a commissioning engineer's distrust.

I build software with AI coding agents every day, and the same discipline turns out to be the missing piece. An agent will report a task complete when it is not. A control nobody has watched deny anything is an assumption. A plan regenerated from the code launders drift into the record. None of that is new. It is the failure mode every commissioning engineer already knows, arriving in an industry that has not learned to distrust a status point yet.

At Enviromatic Systems I combine controls engineering with internal software: tools that went from one manager's request to department-wide use, an operations platform, and the department's Applications Engineer curriculum. Through HLLMR Ventures I build products of my own (Writwall, Stratum DSP and Silo among them), owning the engineering decisions, integration, verification and delivery.

The full experience

What I want to do next

Lead engineering and applied-AI work where building-systems expertise shapes better products and better operations: BAS and OT engineering leadership, and forward-deployed work with real ownership of customer outcomes and product direction. The people who design, deliver and operate buildings deserve better information, better tools and more reliable processes.

Get in touch

The longer story, in chapters.

Written one chapter at a time, from my own account, and published when it's right. Until then each one says where it stands.

  1. Chapter 01 Origins

    Where I come from and what shaped me. To be written from an interview.

    Not yet written
  2. Chapter 02 · 1998–2000 Navy nuclear power training

    Where I learned to assume nothing works until I have watched it work.

    Not yet written
  3. Chapter 03 · 2004–2017 Low voltage to building automation

    From security and fire installs to leading a building automation division.

    Not yet written
  4. Chapter 04 Music

    Thirty years behind the decks: a parallel pursuit, not a footnote.

    Not yet written
  5. Chapter 05 · 2007– Businesses

    Five businesses, what worked, what didn't and what each one taught me.

    Not yet written
  6. Chapter 06 · 2025– Software and AI

    From controls engineering to building software with AI agents.

    Not yet written
  7. Chapter 07 Now, and what's unfinished

    What I'm working on and what I still mean to do.

    Not yet written