Ironsite attacks the single biggest cost lever in construction — labor — by revolutionizing how productivity is tracked and optimized. Backed by South Park Commons.
About the role
As Post-Training Lead , you will report directly to the Chief Science Officer and own our post-training effort end to end: training, benchmarking, and deploying state-of-the-art VLMs that can interpret the complexity of a real-world construction site, built on data no other lab has. This is a hands-on technical lead role: train models, lead the researchers already working on SFT and RL, and help grow the team around this effort.
What they're looking for
- Build on the Construction Intelligence Benchmark: Expand our existing benchmark suite: video question answering, temporal reasoning, activity recognition, and site-level analytical reasoning
- Build Scalable Pipelines: Develop and own the model training and evaluation pipelines, ensuring we can rapidly experiment, measure performance, and deploy models into production
More about this role
The construction site is the most dynamic, unstructured physical environment in the world, and until now almost nothing that happens on one has been recorded. Ironsite records it. We design our own smart hard hats with cameras, deploy them with craft workers on the largest infrastructure projects in the country (data centers, LNG facilities, stadiums, hospitals), and turn each shift's footage into actionable insights superintendents read by 5 AM the next morning to improve the speed, efficiency, and predictability of their jobsite. We are pro-worker at our core, empowering the workforce that builds our country.
Our footage is now the world's largest dataset of first-person video from active construction sites, and we are using it to build a world model with the spatial intelligence to understand it. Our mission is to create general models that deeply understand dynamic, unstructured environments, predict how work will unfold, and use that understanding to supercharge human productivity and eventually enable robots to fill critical labor gaps. Our culture is one of radical transparency, intellectual honesty, low ego, rapid experimentation, and curiosity.
Ironsite is deployed across...
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