Browser Security Engineer
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Before you apply
SalaryNo pay range posted
LocationSan Francisco
Work modeon-site
Typefull-time
DepartmentEngineering
EquityIncluded
Company size51–200 people
PostedAug 13, 2026 · 2mo ago
Verified live2d ago
May no longer be actively hiring
Posted by the company on Aug 13, 202644% of this company's open roles have been listed for 90+ daysNo pay range listed, though California requires one
At a glanceSummarised by Seekless from the posting.
Deep familiarity with Chromium internals, browser sandboxes, or renderer/network stacks.
Experience with Linux kernel, microVMs (Firecracker, Cloud-Hypervisor, Kata, gVisor, etc.), or container isolation.
Strong debugging skills with strace, gdb, perf, or similar low-level tools.
Knowledge of networking fundamentals (DNS, TCP/IP, NAT, proxies, TLS).
Background in security engineering or browser hardening a plus.
Skills
Chromium
Firecracker
Cloud-Hypervisor
Kata
gVisor
strace
gdb
perf
Linux
DNS
TCP/IP
NAT
TLS
Benefits
Health insurance
Dental coverage
Unlimited PTO
401(k)
Relocation assistance
About Kernel
Kernel is crazy fast, open source browser infrastructure for AI agents. We handle autoscaling, observability, and the messy details of web interaction, so developers can focus on what their agents do instead of how they do it.
Teams at Cash App, Framer, and 7000+ others use Kernel for deep research, QA automation, and real-time web analysis. We’ve raised $22M from Accel, YC, and Vercel.
If you’re interested in building critical infrastructure for agents on the web, we’d love to chat.
About the role
We’re hiring a Browser Security Engineer to harden and extend our Chromium-based browser runtime. You’ll work at the intersection of sandboxing, networking, and virtualization — ensuring our browsers run securely and efficiently across thousands of concurrent users.
What you’ll do
Debug, patch, and optimize Chromium builds running inside Kernel’s microVM environments.
•
Implement and maintain network isolation, proxy routing, and IP handling for browsers.
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Collaborate with infra engineers on unikernel-based isolation, process scheduling, and kernel security policies.
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Build internal tooling for binary analysis, crash triage, and vulnerability monitoring.
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Support the team in maintaining secure supply chain and reproducible builds for our browser images.
What we’re looking for
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Deep familiarity with Chromium internals, browser sandboxes, or renderer/network stacks.
•
Experience with Linux kernel, microVMs (Firecracker, Cloud-Hypervisor, Kata, gVisor, etc.), or container isolation.
•
Strong debugging skills with strace, gdb, perf, or similar low-level tools.
•
Knowledge of networking fundamentals (DNS, TCP/IP, NAT, proxies, TLS).
•
Background in security engineering or browser hardening a plus.
What you can expect as a Kernel
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Industry-competitive salary
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Above market equity
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Premium medical + dental coverage + dependent coverage
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Small, trusting team of senior + staff engineers
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Default async with minimal bureaucracy
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Daily lunches on us
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Unlimited PTO
•
401k + company match
•
Relocation assistance
Hiring process
We have a simple process focused on real world collaboration and jointly getting to know each other:
1.
30 minute intro calls with one of Kernel’s co-founders
2.
45-minute technical interview (virtual)
3.
Half-day on-site (in-person) working with our team on relevant technical challenges.
4.
Offer!