Senior Software Engineer (Infrastructure)

We are looking for a Senior Software Engineer (Infrastructure) with 6+ years of experience to own the application code that controls Motion's cloud infrastructure – specifically the always-on, per-customer virtual environments that power our AI agent platform. This is not a traditional DevOps or SRE role – we need a developer-first engineer who is 60% backend and 40% infrastructure, someone who fell into infra because they were the first engineer at a startup and owned everything. You'll be joining two intense, high-output engineers building something novel – persistent cloud environments at scale with no real playbook. The ideal candidate is deeply passionate about AI, has shipped production code end-to-end at early-stage startups, and thrives in a high-bar, high-ownership environment.

What you will be doing

Writing the application code that manages VM lifecycle, container updates, queues, observability, and security for Motion's always-on customer environments – scaling from ~500 to 2, 000–3, 000 environments in the coming weeks

Designing and shipping reliable abstractions around messaging queues, locks, background tasks, and service bus mechanics that product engineers can build on

Evolving infrastructure-as-code patterns in Pulumi – defining standards other engineers follow

Working deep in Linux systems, containers, networking, persistent storage, permissions, and runtime debugging

Collaborating on a small, high-ownership cross-functional team with weekly shipping cycles – moving fast on a problem with no existing playbook