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Kernel is building open-source browser infrastructure for AI agents, handling autoscaling, observability, and web interaction complexity. The company serves 7000+ teams including Cash App and Framer, and has raised $22M from Accel, YC, and Vercel.
As a Browser Security Engineer, you'll harden and extend Kernel's Chromium-based browser runtime, working at the intersection of sandboxing, networking, and virtualization. Your responsibilities include debugging and patching Chromium builds running inside microVM environments, implementing network isolation and proxy routing for browsers, and collaborating with infrastructure engineers on unikernel-based isolation and kernel security policies.
You'll build internal tooling for binary analysis, crash triage, and vulnerability monitoring, and support the team in maintaining secure supply chains and reproducible builds for browser images. This role requires deep familiarity with Chromium internals, browser sandboxes, or renderer/network stacks. You should have experience with Linux kernels, microVMs (Firecracker, Cloud-Hypervisor, Kata, gVisor), or container isolation technologies.
Strong debugging skills with tools like strace, gdb, and perf are essential, along with solid knowledge of networking fundamentals including DNS, TCP/IP, NAT, proxies, and TLS. Background in security engineering or browser hardening is a plus. Kernel offers competitive salary, above-market equity, premium medical and dental coverage, and works with a small team of senior and staff engineers in a default-async, low-bureaucracy environment.
