Lead Front-End JavaScript Developer

Big Ladder Software - Denver, CO

Full-timeEstimated: $73,000 - $100,000 a year

Big Ladder Software seeks to hire an experienced front-end JavaScript developer to help us develop innovative software that makes it possible for engineers and planners to create sustainable, efficient, and resilient designs for buildings, campuses, and cities.

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.

About You

Perhaps in a past life you were a mechanical engineer or energy modeler that was drawn into the intriguing world of web programming and software development long ago. Maybe you have a degree in physics or mathematics but somewhere along the way you became more excited about creating the software tools rather than using them. Or possibly you’re just a really talented web developer that drives a Prius and loves to recycle. You are now an encyclopedia of programming knowledge and web wisdom accrued over the years. So what’s missing? Maybe you’ve been working at Internetz Inc. where you and a horde of other developers try to maximize the clicks while hanging on for that mercurial, next round of VC funding. Somewhere in the back of your mind, you wonder if it might be possible to put your skills to good use for a higher purpose... What if you could enjoy the challenge of interesting, creative work, while also having a meaningful impact on the planet? 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:

  • Reenvisioning a legacy application into a stunning, modern JavaScript web application
  • Developing web-based user interfaces for energy modeling tools
  • Redesigning and updating company websites (bigladdersoftware.com, unmethours.com).

Minimum Qualifications

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

  • Minimum three years professional experience as a front-end JavaScript developer
  • Experience leading the development of a significant web application project
  • Experience with systems integration using REST, SOAP, and other APIs
  • Strong understanding of the fundamentals of programming
  • Excellent skills and proven experience with JavaScript, HTML5, and CSS3
  • Ability to rapidly implement single-page applications from design specs
  • Experience using React and Redux libraries for complex applications
  • Experience integrating with databases and web services in the middle of the stack
  • Familiarity with full-stack web development and application deployment
  • Experience with version control systems (preferably Git)
  • Excellent communication and people skills.

Preferred Qualifications

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

  • Background in energy/building science, energy modeling, physics, or mathematics
  • Experience with UI/UX design
  • Experience with web application testing frameworks
  • Experience with data visualization and/or charting libraries (D3, etc.)
  • Experience with scripting languages (Ruby, Python, etc.)
  • Experience with open-source software development.


We offer the following benefits for our employees:

  • Company healthcare plan with $200/month employer contribution
  • 401(k) tax-deferred retirement plan with 1% employer contribution
  • Employer-paid life insurance/long-term disability plan
  • Employer-paid RTD EcoPass transit pass
  • 21 days non-expiring PTO per year
  • Flexible work hours; flexibility to occasionally work remotely
  • Healthy work-life balance
  • Interesting, meaningful, and diverse projects
  • Opportunity to have a significant impact on projects and direction of the company
  • Work in the historic Market Center building located downtown near Union Station.

Additional Information

  • Please provide a cover letter describing why you think this job might be a good fit for you
  • Must be willing to relocate to metro-Denver area to work from our downtown office
  • We do not provide visa sponsorship.

Job Type: Full-time


  • JavaScript Development: 3 years (Required)

Work authorization:

  • United States (Required)

Work Location:

  • One location