# Member of Technical Staff - Research at Trajectory

- Company: Trajectory
- What the company does: Research lab and product company building the platform for continual learning. Backed by Bessemer and Conviction.
- Company website: https://www.trajectory.ai/
- Type: Startups (AI role)
- Level: Senior
- Location: San Francisco
- Work setup: On-site
- Posted: 2026-05-26
- Apply by: 2026-10-08
- Apply: https://jobs.ashbyhq.com/trajectory/569047ce-6dfc-47d4-8a03-38fcce98274e
- Page: https://www.1752.vc/careers/jobs/trajectory-member-of-technical-staff-research/

## About the role

As a Member of Technical Staff (Research) at Trajectory, you will design and build the post‑training stack that lets our customers’ models continually learn from real production workflows. You will own end‑to‑end experiments across data, training, and evaluation: shaping telemetry into learnable signals, training and serving custom LLMs and agents, and designing novel algorithms.

## What they're looking for

- Experience training or serving large language models
- Experience building RL environments or evaluation suites for LLMs
- Proficiency in PyTorch, JAX, or similar ML frameworks
- Strong experimental design skills
- Master’s / research experience

Tags: Member of Technical Staff