Weekly digest
Week of 15 December 2025
32 new roles this week across 10 companies; the biggest movers: Fractile (+10), K2 Space (+8), Reflection AI (+3).
Research
- Member of Technical Staff - Evaluations — Reflection AI Builds open AI models that enable anyone to control and shape intelligent systems
- Member of Technical Staff - Multi-Modal, Audio — Liquid AI Builds efficient foundation models that run on-device across phones, cars, and edge hardware without sending d
Applied AI
Infrastructure
- Member of Technical Staff - Sandbox Service — xAI Develops Grok, an AI platform offering reasoning, code, voice, image, and video capabilities through a unified
Software
- Staff Software Engineer, Product — Anthropic Develops Claude, an AI assistant, with research focused on AI safety and alignment
- Software Engineer, Agent — Sierra Conversational AI platform that deploys customized agents across chat, voice, email, and SMS for customer supp
- System Software Engineer, Consumer Devices — OpenAI Develops AI systems including large language models like ChatGPT for research and commercial use
- Backend Engineer - Enterprise — xAI
- Product Engineer — xDOF XDOF is the infrastructure partner for the world's most ambitious robotics builders
Hardware
- Principal Avionics Systems Engineer — K2 Space Builds high-power satellite buses designed for LEO, MEO, and GEO missions with 10x more power than constellati
- Principal Electrical Engineer — K2 Space
- Principal RF Antenna Engineer — K2 Space
- Hardware System Test Engineering Team Leader — Fractile Builds specialized processors that fuse computation with memory to run large language models up to 25x faster
- Hardware System Test Engineering Team Leader — Fractile
- Semiconductor Test Engineering Team Leader — Fractile
- Semiconductor Test Engineering Team Leader — Fractile
- Senior Development Test Engineer — K2 Space
- Senior Electrical Engineer — K2 Space
- Senior RF Digital Signal Processing Engineer — K2 Space
- Perception Hardware Engineer — Saronic Saronic Technologies develops advanced autonomous surface vessels for naval and maritime applications
- Firmware Engineer, RTOS, Consumer Devices — OpenAI
- Board Test Engineer — Fractile
- Board Test Engineer — Fractile
- Hardware System Test Engineer — Fractile
- Hardware System Test Engineer — Fractile
- Semiconductor Product Engineer — Fractile
- Semiconductor Product Engineer — Fractile
- Development Test Engineer — K2 Space
Go-to-market
Operations
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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