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Residential Building Energy Modeler and Analyst

Jan 11, 2023 General

Big Ladder Software seeks to hire an engineer with experience in modeling residential buildings for analyzing energy efficiency programs and/or energy efficiency codes to help make the world’s built environment more sustainable, efficient, and resilient.

About Us

Founded in 2009, Big Ladder Software is a Denver-based company dedicated to providing software and services for the building energy modeling industry. The company name reflects our mission to “help our clients reach new heights”. We are a team of mechanical engineers and programmers with a unique combination of expertise in building science, computer-based simulation, and software development. We are part of the development teams for the state-of-the-art EnergyPlus simulation engine and the California Simulation Engine. We also develop and maintain several of our own open-source software tools for building energy modeling. We provide training workshops, commercial support, and consulting services to mechanical, architectural, and design engineering firms across the US. Over the past several years, the company has experienced steady growth and achieved significant success and recognition in the industry. We believe that simulation software is a critical tool in achieving the cost-effective changes to our energy infrastructure needed to protect our planet from the severe impacts of climate change.

About You

You have been engaged with the residential building energy efficiency industry, either through RESNET, California Title 24, DOE, or IECC code compliance, and the software-inclined part of you feels a lot can and needs to be done to improve residential energy modeling tools. You’re not afraid to think beyond the landscape of current software offerings, and maybe you’ve even felt an urge to try your hand at writing your own software. You recognize a tedious task when you see one, and you think to yourself: “Someone should automate this!”

What if you could enjoy the challenge of interesting, creative work, while also having a meaningful impact on the planet and building a set of new skills? What if you could play a major role in a small, but growing, dynamic team of mechanical engineers, scientists, and programmers? Sound like you?


This job is a full-time position at our headquarters in downtown Denver. If hired, responsibilities would include:

  • Using building energy modeling software to help inform the advancement of energy codes and other energy efficiency programs.
  • Researching, developing, and implementing modeling approaches used to characterize building physics, HVAC components, and electricity distribution systems.
  • Participating in industry stakeholder committee meetings through RESNET, ASHRAE, and CalBEM to promote improvements in residential energy modeling practices.
  • Automating processes to help investigate inconsistencies in energy modeling programs and identifying areas for improvement.

Minimum Qualifications

To be considered for the job, you should be able to demonstrate the following minimum qualifications:

  • Minimum of three years professional experience in the residential building energy industry
  • Minimum of three years’ experience with building energy modeling software (e.g., REM/Rate, Ekotrope, EnergyGauge, CBECC-Res, BEOpt)
  • Thorough understanding of building physics, heat transfer, HVAC components, and electricity distribution systems
  • Demonstrates a very detail-oriented, self-motivated approach to problem solving.

Preferred Qualifications

The following qualifications are not required but will help your application stand out from the crowd:

  • Experience with RESNET, ASHRAE, or IECC standards development
  • Experience with dynamic scripting languages (e.g., Python, Ruby)
  • Experience with version control systems (preferably Git).


At Big Ladder, all our positions include opportunities to expand your skill set, including:

  • Building Science and mechanical HVAC engineering
  • Energy modeling proficiency (EnergyPlus, CSE, CBECC, OpenStudio)
  • Scripting in Python and Ruby
  • Computational programming in C++
  • Data science
  • Front-end web development in React
  • Server-side web development
  • Professional organization engagement (ASHRAE, IBPSA, RESNET)

Additional Information

Please provide a cover letter describing why you think this job might be a good fit (applications without a cover letter will not be considered)

Must be willing to relocate to metro-Denver area to work from our downtown office

We require background checks for all applicants

We do not provide visa sponsorship.

Job Type: Full-time

Pay: $85,000.00 – $100,000.00 per year


  • 401(k)
  • 401(k) matching
  • Dental insurance
  • Flexible schedule
  • Health insurance
  • Health savings account
  • Life insurance
  • Paid time off
  • Parental leave
  • Relocation assistance
  • Retirement plan
  • Tuition reimbursement
  • Schedule:
  • Monday to Friday
  • Self-determined schedule
  • Work Location: Hybrid remote in Denver, CO 80202

To apply, visit https://www.indeed.com/job/residential-building-energy-modeler-and-analyst-abe4c20226e0d46b?_ga=2.263075788.1510020788.1673281402-1933976526.1671817760