Member of Technical Staff - Post-Training
- Location
- San Francisco, CA · On-site
- Job type
- Full-time
- Level
- Mid-level
- Listed
- 23 days ago
Skills & highlights for this role
- PyTorch
- Python
- supervised fine-tuning
- reinforcement learning
- preference optimization
Also useful
- tool-using agents
- evaluation design
What you'll do
- Post-train open models to power personal agents that run locally on Core.
- Improve tool use, reasoning, and reliable execution across complex, multi-step tasks.
- Build training datasets and feedback pipelines grounded in realistic agent workflows.
- Develop supervised fine-tuning and reinforcement learning methods that translate model capability into useful product behavior.
- Build evaluations that measure task completion, personalization, and when agents should act or ask for guidance.
- Work closely with the agent and inference teams to improve quality within on-device memory, compute, and latency constraints.
Who you are
- Experience post-training language models through supervised fine-tuning, reinforcement learning, or preference optimization.
- Strong Python and PyTorch skills, with experience building and debugging training pipelines.
- Experience creating datasets and evaluations that produce measurable improvements in model behavior.
- Familiarity with tool-using agents, multi-step environments, and the challenges of training against task outcomes.
- Strong experimental judgment: you can diagnose failures, test hypotheses, and distinguish benchmark gains from meaningful product improvements.
- Ability to work on-site in San Francisco.
About Ghost
Ghost is a personal AI hardware company.
To realize the full benefit of what models will do for people, we believe an entirely new platform will be built around AI. Some devices will let your AI understand what is happening around you, others will enable you to get things done without navigating apps or menus.
As these systems become more capable and more personal, it matters who owns them. We’re building a future where that intelligence belongs to you, with an ecosystem of devices and software that gives you greater control over your time, attention, and the things you want to accomplish.
From Ghost's careers page, first listed on Rolev.ai on October 17, 2026. Rolev.ai is not the employer.
How Rolev.ai helps with this application
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Common questions
Where is the Member of Technical Staff - Post-Training job at Ghost located?
This Member of Technical Staff - Post-Training position at Ghost is located in San Francisco, CA (On-site). Always check Ghost's application page for specific state eligibility or relocation policies.
What qualifications are required for Member of Technical Staff - Post-Training at Ghost?
For the Member of Technical Staff - Post-Training role, Ghost highlights experience with PyTorch, Python, supervised fine-tuning, reinforcement learning, preference optimization. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Member of Technical Staff - Post-Training position at Ghost?
This listing links directly to Ghost's Ashby application page. You can apply directly on Ghost's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Ashby application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.