Head of Finance
About Us
Sieve is a multi-modal lab curating the world's highest-quality training datasets - spanning video, audio, images, text, and 3D. We combine exabyte-scale data infrastructure and novel multimodal understanding techniques that push the frontier of foundation models. Video alone makes up 80% of internet traffic, and across modalities, data has become the enabling medium powering creativity, communication, gaming, AR/VR, and robotics. Sieve exists to solve the biggest bottleneck in the growth of these applications: high-quality training data.
We partner with top AI labs and did $XXM last quarter alone, as a team of ~30 people. We also raised our Series A from Tier 1 firms such as Matrix Partners, Swift Ventures, Y Combinator, and AI Grant.
Why Now
Sieve is one of the most capital-efficient teams in AI - roughly 30 people serving the world's leading AI labs across every major data modality. You'll join early, own problems end-to-end, and watch your work ship directly into the models defining the frontier.
About the Role
You’ll be Sieve’s first finance leader, owning the financial foundation for our next stage of growth and helping build the finance function from scratch.
This role will own financial planning, infrastructure, and reporting while developing a detailed understanding of Sieve’s unit economics. You’ll help make better decisions across customer deals, compute commitments, contributor payouts, hiring, and capital allocation.
You’ll be equally comfortable building detailed models, working across messy operational datasets, and turning your analysis into clear recommendations.
What You’ll Do
Build and own Sieve’s financial model, forecasts, budgets, and runway planning
Model the true cost and margin of customer deals across reinforcement learning, computer use, video, and other data types
Partner with leadership on pricing, resource allocation, hiring plans, compute strategy, and other strategic decisions
Model and optimize contributor payouts to balance supply, quality, speed, and margin
Own financial reporting for the leadership team and board
Work across commercial, engineering, and operations teams to improve financial visibility and operating efficiency
Own treasury, monthly close, payroll, tax while helping build the finance team
Requirements
6+ years of experience in strategic finance, FP&A, investment banking, private equity, or a similarly analytical role
Strong financial modeling skills and a rigorous understanding of unit economics, contribution margin, and cash flow
Built up a tech finance function before, or at least major parts of one, from scratch.
Comfortable operating with significant ownership and ambiguity in a fast-moving startup
Excellent communication skills and experience partnering with senior leadership
Experience working with a modern finance stack + AI tooling
In-person at our SF HQ
Nice to Have
Experience at an AI, infrastructure, data, marketplace, or usage-based software company
Experience modeling compute, storage, or other variable infrastructure costs
Experience as an early finance hire at a startup and built teams from scratch
Benefits
401k + Full Health Insurance
Breakfast, Lunch, and Dinner covered and your choice of snacks
Ubers covered home