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Reactor

Building infrastructure for real-time generative world models.

Lightspeed — Backed by Lightspeed
aienterprise-software
reactor.inc ↗
Jobs Hiring Closed Discussion

Company facts

Founded
2025
Employees
10
Headquarters
United States
Type
Private
Funding
Seed
6 jobs
Reactor
2 days ago

Member of Technical Staff, GPU & Distributed Systems

NewBe an early applicant On-siteNorth America
United States

Builds the distributed cloud systems behind Reactor's real-time world-model inference platform: multi-node GPU inference, fast model loading and weight distribution, Kubernetes scheduling across clouds, and GPU communication tuning to cut cold starts and tail latency. Stack: Go/Rust/C++/Python, Kubernetes, NCCL/RDMA, NVIDIA GPUs and AWS Trainium.

AI AWS Cloud C++ CUDA +15 skills
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Reactor
2 days ago

Robot Test Engineer

NewBe an early applicant On-siteNorth America
United States

Robot Test Engineer at Reactor, an AI startup building an inference platform for real-time world models, working in person in San Francisco. You build and maintain a robot testing fleet, deploy VLA/imitation-learning policies on real robot arms, run repeated manipulation trials to compare checkpoints, debug hardware-to-software failures, and write Python tooling for experiments.

AI CAD Git GitHub Linux +2 skills
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Reactor Backed by Lightspeed
10 views 2 weeks ago

Member of Technical Staff, Robotics

On-siteNorth America
United States

Hands-on robotics founding engineer at Reactor, a startup building an AI inference platform for real-time world models. You'll serve robot policies (VLAs, IL/RL) on GPUs under strict latency budgets, build ROS/ROS2 integration and low-latency transport, and debug the full loop from sensors to actions, primarily in C++ and Python.

AI Cloud C++ CUDA Data Pipelines +13 skills
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Reactor Backed by Lightspeed
15 views 2 months ago

Platform Engineer

Open 51d On-siteNorth AmericaSenior
United States

Reactor is hiring a Platform Engineer in San Francisco to own the infrastructure platform its AI models run on: multi-region Kubernetes across AWS and GPU cloud providers, GitOps deployments, GPU node scheduling and caching, networking/media relays, observability, and CI/CD for Go and Python services.

AI Automation AWS CI/CD Cloud +23 skills
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Reactor Backed by Lightspeed
9 views 4 months ago

Forward Deployed Engineer

Open 123d On-siteNorth America
United States

Reactor is building the inference platform for real-time world models. We run the largest and fastest catalog of world models on the market (15+ and growing), including LingBot World 2, LTX 2.5 Realtime, and…

AI CUDA Machine Learning Python PyTorch +1 skills
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Reactor Backed by Lightspeed
13 views 4 months ago

Member of Technical Staff, DevOps

Open 123d On-siteNorth America
United States

Reactor is building the inference platform for real-time world models. We run the largest and fastest catalog of world models on the market (15+ and growing), including LingBot World 2, LTX 2.5 Realtime, and…

AI Authentication Automation Bash CI/CD +17 skills
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