About the Role
We're looking for a Head of People & Talent to build our People and Recruiting function from the ground up. This is a true 0-to-1 role — you won't be inheriting a playbook, you'll be writing it. You'll own the full recruiting lifecycle across engineering, research, and AI roles, while simultaneously standing up the HR operations, compensation, benefits, and people analytics infrastructure that will carry us through the next phase of growth.
You'll report directly to the Head of Finance & Operations and work in close partnership with the founders. This is a rare opportunity to define what "great" looks like for People at RadixArk — and to build it yourself.
This role is not for the faint of heart. We move fast, operate with a sense of urgency, and expect the same from everyone on the team.
What You'll Own
Recruiting
- Full-cycle recruiting for engineering, research, and AI roles — from sourcing and outreach to offer and close
- Sourcing strategy — proactively building pipelines through LinkedIn, referrals, university networks, and creative outreach
- Candidate experience — managing communication and keeping candidates warm and engaged throughout the process
- Recruiting ops — owning our ATS, tracking pipelines, and reporting on hiring metrics
Recruiting Coordination
- Own end-to-end interview scheduling across all open roles — coordinating across candidates, interviewers, and time zones with speed and precision
- Prepare and manage interview materials, scorecards, and debrief logistics so every loop runs smoothly
- Build and maintain recruiting presentations and materials for candidate pitches, hiring manager kick-offs, and leadership reporting
- Track coordination workflows and flag bottlenecks to keep hiring velocity high
People Operations
- HR operations — onboarding, offboarding, maintaining employee records, and building lightweight but scalable HR processes
- Compensation & offers — designing our comp philosophy, building salary bands, and owning the offer process end to end
- Benefits — selecting and managing our benefits programs and vendors as we scale
- People analytics — building the reporting and dashboards that give leadership visibility into headcount, hiring velocity, and workforce trends
Compliance & Legal Coordination
- Coordinating with legal on immigration, compliance, and employment matters (H-1B, O-1, etc.)
Who You Are
- Available for a hybrid schedule with 3 days per week onsite at our Palo Alto office
- 7+ years of experience across recruiting and people operations, with meaningful time in a leadership or senior individual contributor role at a high-growth tech company
- You've hired for technical and research roles (engineers, ML researchers, etc.) and know what great looks like
- Experience building or significantly scaling a People function — you've done far more than recruit
- Comfortable owning comp, benefits, HR ops, and recruiting coordination — not just the top of funnel
- Highly organized and execution-oriented — you can manage multiple open roles, operational workstreams, and scheduling complexity simultaneously without dropping the ball
- Scrappy, resourceful, and highly responsive — you treat recruiting like a competitive sport
- Strong communicator who can run a candidate pitch, a hiring manager kick-off, and a board headcount update with equal confidence
- Low ego, high output — you do what it takes to get the right people in the door and keep them there
- Experience with immigration processes (H-1B, O-1) a strong plus
About RadixArk
RadixArk is an infrastructure-first company built by engineers who've shipped production AI systems, created SGLang (20K+ GitHub stars, the fastest open LLM serving engine), and developed Miles (our large-scale RL framework).
We're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training. Our team has optimized kernels serving billions of tokens daily, designed distributed training systems coordinating 10,000+ GPUs, and contributed to infrastructure that powers leading AI companies and research labs.
We're backed by well-known infrastructure investors and partner with Nvidia, Google, AWS, and frontier AI labs. Join us in building infrastructure that gives real leverage back to the AI community.
Compensation
We offer competitive compensation with meaningful equity, comprehensive benefits, and flexible work arrangements. Compensation depends on location, experience, and level.
Equal Opportunity
RadixArk is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.