Staff Platform Engineer

Location: San Francisco

Department: Engineering

Location Type: IN_OFFICE

Employment Type: FULL_TIME

About Ironsite

The Role

What You'll Build

• Labor Management. The tools superintendents will run their entire jobsite on: Time & Attendance, Crew Management, Change Order Management, Progress Tracking & As-Builts, and Labor Planning. This is the daily-driver surface that decides whether Ironsite becomes the system of record for the field.
• Craft Worker Mobile Experience. The worker-facing mobile web app that turns Ironsite from something workers wear into something they use daily — profiles, stats, achievements, badges, the rewards marketplace, exportable resumes, and multi-language daily notifications with SMS delivery for workers in the field. This is where our pro-workforce philosophy translates into product.
• Integrations & API. The connectors that let Ironsite plug into the existing construction and HR stack, including Procore, Autodesk, Trimble, and the long tail of ERP and payroll systems, along with the API infrastructure underneath them. Done right, this is what makes Ironsite the ground-truth layer feeding every other system on a jobsite; done wrong, it's a bottleneck on every deployment.
• Ground Truth Tooling. The internal tools that power our labeling operation and feed the AI team's data engine, including the Tagger Portal, GT dashboards, admin tools, and quality tooling that keep hundreds of subject-matter experts labeling thousands of hours of video every night at a bar high enough for our research team to train and evaluate on.

Technical Challenges You'll Solve

• Turning raw, high-volume model output into insights that have to be right by 5 AM. Every night, our system processes thousands of hours of jobsite video into production reports that superintendents open before the crews arrive on site. That deadline is real, the reports have to be trustworthy, and the underlying model outputs are messy at the scale we operate. You'll own the data infrastructure and reporting layer that makes this happen without fail.
• Building the integration layer for an industry running on legacy tools. Ironsite has to interoperate with Procore, Autodesk, Trimble, and a long tail of ERP and payroll systems that are decades old and often internally inconsistent. This isn't a check-the-box integration project. It's designing the architecture that lets Ironsite pull ground-truth data from and push insights back into systems the industry actually uses, while insulating our core platform from the chaos of those interfaces.
• Scaling internal tooling for a labeling operation that never stops. Our labeling team labels thousands of hours of video every night to feed the AI team's training and evaluation pipelines. As the operation grows, the tooling has to keep the workforce fast, the data clean, and the quality bar high enough that our researchers can trust what they're training on.

What We're Looking For

• Deep full-stack expertise, comfortable owning a system end-to-end from the browser to the database and everything in between. You've made real judgment calls on modern frontend (React/TypeScript), backend services (Node.js, PostgreSQL, Redis), and cloud infrastructure (AWS), and you know when each tool is the right one and when it isn't.
• A strong track record with API design, third-party integrations, and real-time data and analytics surfaces — specifically the ability to build systems where correctness, performance, and clarity for downstream teams all matter at the same time.
• Experience shipping web applications at scale, in production, with the kind of reliability construction customers won't tolerate the absence of.
• Systems thinking that spans end-to-end product architecture and cross-team integration. You care as much about the seams between systems as the systems themselves.
• Typically 8+ years of engineering experience, with meaningful time spent operating at a Staff/Principal level at a company you're proud of.

Preferred Qualifications

• 8+ years of engineering experience, with at least 3 spent operating at Staff/Principal level at a company you're proud of.
• Deep experience owning and evolving core platform infrastructure including data pipelines, backend services, developer tooling, or the systems everything else at the company runs on.
• A track record of shipping systems that scaled by orders of magnitude in throughput, users, or data volume, and doing so without over-engineering early or accumulating dead architectural weight late.
• Strong opinions about system design tradeoffs, and the judgment to know when to invest in abstraction vs. when to ship the boring solution that works today.
• A history of raising the bar around you, including mentoring senior engineers, driving technical decisions through influence rather than authority, and making the teams you're on materially better.
• Comfort operating in environments where the right answer isn't obvious yet.
• Genuine excitement about industries that have been underserved by software, and interest in becoming the person who builds the infrastructure the physical world runs on.
• A background in Computer Science, Software Engineering, Mathematics, Physics, or a related technical field, or the equivalent hands-on experience.

Location, Compensation, & Perks

• San Francisco Bay Area (on-site)
• Base salary: $275k-$325k per year, commensurate with experience
• Meaningful founding-team equity.
• Full benefits including health, dental, vision, and 401(k) with 6% match
• Daily catered breakfast and lunch
• Office in San Francisco, next to Oracle Park and the Caltrain