Senior Endpoint Engineer

SENIOR ENDPOINT ENGINEER

ABOUT ENT

Ent is the intent-aware workspace security platform for securing human and AI-driven work. Built to protect productivity, the new attack surface, Ent understands not just what users and agents do but why, and intervenes at the moment of risk before incidents occur. Where existing tools see events, Ent sees intent, so security teams can step in at the moment of risk instead of investigating days later. Founded by Lou Manousos and Brandon Dixon, co-founders of RiskIQ (acquired by Microsoft) and the team behind Microsoft Security Copilot, Ent is in production with Global 2000 customers across hospitality, financial services, and defense, and backed by Decibel, Sequoia, Crosspoint Capital, Craft Ventures, Shield Capital, Felicis, and In-Q-Tel. We’re now hiring the team that will define this category.

HOW WE WORK

Customer first. The product and the business are built around problems we’ve watched real security teams struggle with — not the other way around. Every roadmap conversation starts with what a CISO told us last week.

Humble. No drama. We hire people who share the mission and trust each other to deliver. Teamwork over showmanship. Accountability over politics. The work speaks louder than the person doing it.

Urgency. The window to build a durable security company in the AI era is open right now and it will not stay open. The shot clock has started. We move at the speed of the people we want to protect.

ABOUT THE ROLE

We are seeking an Endpoint Engineer to be part of the team that owns the endpoint agent every Ent capability ships on: collection, policy evaluation, enforcement, transport, and the lifecycle machinery around them. This role is measured on the things customers only notice when they break — installs, updates, offline behavior, and resource footprint on machines you cannot log into. Every other endpoint capability depends on getting it right.

WHAT YOU’LL ACHIEVE

• Build and own components of Ent's single lightweight agent across Windows, macOS, or Linux; collection, enrichment, policy evaluation, enforcement, IPC, local storage, and cloud transport.

• Deliver features end to end: design, implementation, tests, telemetry, staged rollout, and post-release monitoring.

• Own agent lifecycle engineering: packaging and installers (MSI, PKG, DEB/RPM), enrollment, configuration delivery, safe staged self-update, rollback, and clean uninstall.

• Keep the agent fast and boring — enforce CPU, memory, disk, and network budgets, catch performance regressions in CI, and treat stability as non-negotiable on machines you cannot log into.

• Implement offline and degraded-mode behavior: local queueing, backpressure, policy caching, retry semantics, and clock and connectivity edge cases.

• Apply secure engineering fundamentals inside a privileged process: least privilege, signed and verified updates, secrets handling, and safe parsing of untrusted input.

• Build diagnostics, log collection, health reporting, and support tooling so field issues can be root-caused without attaching a debugger to a customer's laptop.

• Own test infrastructure for the agent: unit and integration tests, cross-platform CI, OS-version matrices, upgrade and downgrade paths, and soak and performance testing on real hardware.

• Integrate agent signals with backend services and the browser extension, and work with platform teams on API and schema evolution without breaking older agent versions.

• Handle escalations across the stack — failed installs, conflicts with other security agents, OS and kernel upgrades, crashes, and performance complaints.

• Contribute to code review, design review, documentation, and the on-call rotation for agent health.

WHAT YOU’LL BRING

MUST-HAVES

• 5+ years building production software in C/C++ or Swift, including work on native desktop or endpoint software.

• Working knowledge of operating system internals and system APIs on at least one of Wi