Weekly digest
Week of 29 December 2025
10 new roles this week across 5 companies; the biggest movers: RadixArk (+3), Fractile (+2), K2 Space (+2).
Research
- Research Scientist (Generative Modeling) — World Labs Builds 3D world generation models that create spatially consistent environments from text, images, and video
ML engineering
- Member of Technical Staff — Inference-TPU — RadixArk Builds open-source inference and training infrastructure systems for AI applications
Infrastructure
Software
Hardware
- Senior/Principal Physical Design Engineer — Fractile Builds specialized processors that fuse computation with memory to run large language models up to 25x faster
- Senior/Principal Physical Design Engineer — Fractile
- Structural Engineer, Data Centers - Memphis — xAI Develops Grok, an AI platform offering reasoning, code, voice, image, and video capabilities through a unified
Operations
- Senior Supply Chain Planner — K2 Space Builds high-power satellite buses designed for LEO, MEO, and GEO missions with 10x more power than constellati
- Supply Chain Planner — 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
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