Weekly digest
Week of 1 December 2025
42 new roles this week across 12 companies; the biggest movers: K2 Space (+15), Sierra (+13), Fractile (+5).
Research
- Research Engineer / Research Scientist- Personal AGI (Post Training) — OpenAI Develops AI systems including large language models like ChatGPT for research and commercial use
- Liquid Labs - Research Engineer — Liquid AI Builds efficient foundation models that run on-device across phones, cars, and edge hardware without sending d
ML engineering
- ML Runtime Engineer — Fractile Builds specialized processors that fuse computation with memory to run large language models up to 25x faster
- Machine Learning Engineer — Goodfire Goodfire is a San Francisco-based public benefit corporation focused on AI interpretability and safety
- Machine Learning Engineer - Ads — xAI Develops Grok, an AI platform offering reasoning, code, voice, image, and video capabilities through a unified
Infrastructure
- Member of Technical Staff (Software Engineer, Security) — Perplexity AI-powered answer engine that provides conversational, source-backed responses to user queries
- Senior Linux Kernel Driver Engineer — Fractile
- Developer Operations / DevOps — Bazel Monorepo — Fractile
- All Future Mission Assignments - National Security Programs — K2 Space Builds high-power satellite buses designed for LEO, MEO, and GEO missions with 10x more power than constellati
Software
- Senior Systems Software Engineer — Fractile
- Software Engineer, Agent — Sierra Conversational AI platform that deploys customized agents across chat, voice, email, and SMS for customer supp
- Software Engineer, Agent — Sierra
- Software Engineer, Agent (Arabic speaking) — Sierra
- Software Engineer, Agent (Italian speaking) — Sierra
- ソフトウェアエンジニア（AIエージェント） — Sierra
- Modelling Engineer — Fractile
- All Future Mission Assignments - Product Engineering — K2 Space
- All Future Mission Assignments - Software — K2 Space
Hardware
Product
- Product Manager — Saronic Saronic Technologies develops advanced autonomous surface vessels for naval and maritime applications
- Product Manager, Agent Development (Arabic speaking) — Sierra
- Product Manager, Agent Development (Italian speaking) — Sierra
- プロダクト・マネージャー (Product Manager, Agent Development) — Sierra
Design
- Eyewear Designer — Sesame AI Sesame Technology is a multifaceted technology company with diverse offerings
Go-to-market
Operations
Other
- Risk Team Lead / Director — WithCoverage Digital platform for managing insurance policies, claims, and risk for CPG brands and growing businesses
- Technical Deployment Lead — Anthropic Develops Claude, an AI assistant, with research focused on AI safety and alignment
- Strategist, Agent Development (Arabic speaking) — Sierra
- Strategist, Agent Development (German speaking) — Sierra
- Strategist, Agent Development (Italian speaking) — Sierra
- All Future Mission Assignments - GNC — K2 Space
- All Future Mission Assignments - Production — K2 Space
Every line links to the role on Liftoff Jobs, and from there to the company's own board. · Past issues · Search the whole index
One email a week, Monday morning. Nothing is sent unless you click the link in the confirmation email. You can switch to a daily email, or stop, from any email we send.