High Volume (TOFU) Recruiter

About HumanSignal Real-world data is the competitive edge in AI. HumanSignal is a human data partner for companies building AI models and products. Our customers ship better AI, faster, because we partner with their researchers from real-world data creation to annotation to delivery. We design and create datasets from scratch, recruit and manage the domain experts who evaluate model output, and run everything through our own platform, Label Studio, the open-source standard for data labeling and evaluation, used by over 1 million practitioners worldwide. We specialize in the operationally complex: real-world data collection, multimodal pipelines, and multi-step workflows. Advanced ML and AI teams use our enterprise platform to run their own data factories, and our services team to extend their reach where in-house capacity runs out. If you want to do work that materially shapes how the next generation of AI products gets built, we'd love to talk. Level: Individual Contributor Compensation: $55,000 – $100,000 Location: San Francisco, CA preferred; open to other remote options About the Role HumanSignal Services runs on expert talent — and we need a lot of it, fast. As our high-volume recruiter, you are the engine that keeps our data programs fully staffed with the right contributors at the right time. This isn't a post-and-pray recruiting role. You'll be proactive, scrappy, and relentless — sourcing, screening, and moving candidates through a pipeline that never stops. When a program needs 500 vetted domain experts in 72 hours, you're the one who makes it happen. Speed matters here, but so does quality — the wrong contributor wastes everyone's time and hurts the data. You'll own both. What You'll Do You'll run high-volume sourcing across multiple channels simultaneously — job boards, LinkedIn, niche communities, referral networks, and anywhere else qualified talent lives. You'll screen candidates quickly and accurately, matching domain expertise to program requirements. You'll own pipeline health metrics — application volume, time-to-fill, screen-to-hire ratios — and hold yourself accountable to them daily. You'll work hand-in-hand with Strategic Project Leads and Operations to understand what each program actually needs, not just what the job description says. When a pipeline dries up or a new program spins up overnight, you don't wait to be told — you move. The programs don't stop for recruiting, so recruiting can't stop either. Source and screen high volumes of candidates across multiple active programs simultaneously, maintaining quality and speed without sacrificing either Own top-of-funnel pipeline health: track application volume, conversion rates, time-to-fill, and screen-to-hire ratios daily Partner closely with Strategic Project Leads and Operations to understand program-specific requirements — domain expertise, availability windows, technical qualifications, and quality standards Build and maintain sourcing pipelines across job boards, LinkedIn, academic networks, professional communities, and referral programs Develop and iterate on outreach messaging, job descriptions, and screening criteria to improve conversion at every stage of the funnel Coordinate scheduling and logistics for screening calls, assessments, and onboarding hand-offs Flag pipeline risks early — if a program is at risk of understaffing, surface it before it becomes a delivery problem Continuously improve sourcing strategies based on data; identify which channels produce the best contributors for each domain Required Qualifications 2+ years of high-volume recruiting or sourcing experience Proven track record managing large candidate pipelines under tight timelines Strong organizational skills; comfortable juggling multiple open requisitions at once Data-driven: comfortable tracking and reporting on funnel metrics Excellent written communication for high-volume outreach and candidate engagement Scrappy, self-directed, and comfortable operating with minimal process in a fast-moving environment Preferred Qualifications Experience recruiting for technical, domain-expert, or gig/contractor workforces Familiarity with AI data operations, annotation, or RLHF workforce programs Experience with ATS platforms (Greenhouse, Ashby, Lever, or similar) Background in marketplace operations, staffing, or workforce platforms About HumanSignal HumanSignal Services specializes in operationally complex, multimodal data collection and annotation — delivering the datasets that frontier AI research requires and remote workforce marketplaces can't. We own projects end-to-end, from scoping and protocol design through final delivery, running on-site and distributed expert workforces across 50+ knowledge domains, 30+ languages, and 75+ countries. Our work spans RLHF, evals, red-teaming, and custom multimodal data creation, all powered by Label Studio Enterprise and built on a foundation of rigorous quality workflows, ethical sourcing, and full data security. Equal Opportunity Employer HumanSignal is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. HumanSignal does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, genetic information, or any other characteristic protected by applicable federal, state, or local law. We are committed to working with and providing reasonable accommodations to individuals with disabilities.