Machine Learning Engineer

Machine Learning Engineer You'll build the ML behind Firecrawl: the models and the systems that serve them. That starts with search: training and shipping the ranking and relevance models for one of our fastest-growing products, then extending that work across extraction quality and LLM-driven features. You'll also own how we measure: A/B testing launches and building the experimentation frameworks the whole team ships against. If you ship models into production, whether your title says ML engineer or data scientist, this is for you. Salary Range: $250,000–$290,000 USD/year (SF) / $210,000–$224,000 CAD/year (Toronto) Equity Range: Competitive equity. Details shared during the process. Location: San Francisco, CA (SF HQ) or Toronto, ON (Toronto Hub). Hybrid, onsite 3+ days a week. Job Type: Full-Time Experience: 3+ years building ML or data-heavy systems in production Work Authorization: Open to candidates already authorized to work in the US or Canada. In the US, we also support H-1B transfers, F-1 OPT and STEM OPT, TN (Canada and Mexico), and E-3 (Australia). We’re not able to sponsor new H-1B visas for candidates outside the US. For Canada, we’ll consider work permit sponsorship case by case through our Toronto Hub. About Firecrawl Firecrawl is the easiest way to turn the web into data AI agents can use. One API call converts any URL into clean, LLM-ready markdown or structured data. It's the boring-hard problem everyone building with LLMs eventually hits, solved. In September 2026, we raised a $75M Series B led by Smash Capital, and we're spending it building the largest repository of knowledge in the world. We hit 8 figures in ARR in year one and more than doubled it in year two. We have 192k+ GitHub stars, putting us in the top 40 repositories of all time, and developers, agents, and category-defining AI companies build on us every day. Growth like this is rare, and we're just getting started. We're a small team punching far above our weight. Everyone here owns a real piece of the product and company, end to end, and runs it themselves. No hiding behind process or headcount. This is a place for people who want to work at the frontier: an AI company building the infrastructure other AI companies run on, not one bolting AI onto an existing product. We move fast, go deep, and are building the tools superintelligence will rely on to gather data from the web. That library is called Alexandria, and it starts now. What You'll Do Improve ranking and relevance for Firecrawl Search, from feature engineering to model training to production Build and tune models for learning-to-rank, query understanding, and LLM-driven retrieval Extend ML across Firecrawl's products: extraction quality, content classification, and evaluation of LLM-driven features Mine query logs and behavioral data at scale to find where our products win and where they fail Build the data pipelines that turn web-scale crawl and query data into training data and features Work hands-on with platform, search, and cloud DevOps engineers to get models running fast and cheap in production Design our testing strategy: the A/B testing frameworks and offline evaluation the team ships against Partner on product launches across Firecrawl: define success metrics, run the experiments, and make the ship/no-ship call on evidence Report on how releases perform post-launch and turn the findings into the next iteration What We're Looking For You've shipped ML models into production systems and owned them after launch: deploying, monitoring, and retraining them, not handing them off You have real ranking or relevance-modeling experience: learning-to-rank, recommendations, or search quality You're comfortable in large, data-heavy systems: query logs, pipelines, and datasets that don't fit in memory You write production-quality code (Python at minimum) and can work inside a real backend codebase You're rigorous about measurement. You've designed and analyzed A/B tests and know when a lift is real You can communicate results clearly to the team: what shipped, what moved, and what to do next Nice to Have MLOps experience: MLflow, experiment tracking, model registries, or feature stores. Kubernetes is a plus Experience building or standardizing an experimentation framework at a previous company Experience with embedding models, vector retrieval, or LLM-based relevance evaluation Experience evaluating LLM outputs at scale: quality scoring, structured-extraction accuracy, or agent behavior Spark or similar large-scale data processing experience What We're NOT Looking For A pure statistician or analyst who needs an engineering team to productionize their work Someone who wants to specialize narrowly and hand off everything else Someone who optimizes for process over shipping A Note On Pace We operate at an absurd level of urgency because the window for what we're building won't stay open forever. If that excites you, keep reading. If it doesn't, no hard feelings, but this role probably isn't for you. Benefits & Perks Available to all employees Salary that makes sense: $250,000–$290,000 USD/year (SF) / $210,000–$224,000 CAD/year (Toronto), based on impact, not tenure Own a piece: Gain competitive equity in what you're helping build Generous PTO: 15 days mandatory, anything after 24 days, just ask (holidays excluded). Take the time you need to recharge Parental leave: 12 weeks fully paid, for all parents Wellness stipend: $100 USD/month for the gym, therapy, massages, or whatever keeps you human Learning & Development: Expense up to $1,000 USD/year toward anything that helps you grow professionally Team offsites: A change of scenery, minus the trust falls Sabbatical: 3 paid months off after 4 years, do something fun and new Available to US-based full-time employees Full coverage, no red tape: Medical, dental, and vision (100% for employees, 50%