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Browser Security Engineer

KernelSan Francisco, California
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Overview

Schedule
Full-time
Career level
Senior-level
Remote
On-site
Benefits
Health Insurance
Dental Insurance
Family/Dependent Health

Job Description

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.

  • Collaborate with infra engineers on unikernel-based isolation, process scheduling, and kernel security policies.

  • Build internal tooling for binary analysis, crash triage, and vulnerability monitoring.

  • Support the team in maintaining secure supply chain and reproducible builds for our browser images.

​

What we’re looking for

  • 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

  • Industry-competitive salary

  • Above market equity

  • Premium medical + dental coverage + dependent coverage

  • Small, trusting team of senior + staff engineers

  • Default async with minimal bureaucracy

  • Daily lunches on us

  • 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!

​

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Submit 10x as many applications with less effort than one manual application.

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FAQs About Browser Security Engineer Jobs at Kernel

What is the work location for this position at Kernel?
This job at Kernel is located in San Francisco, California, according to the details provided by the employer. Some roles may also include multiple work locations depending on the requirement.
What pay range can candidates expect for this role at Kernel?
Employer has not shared pay details for this role.
What employment applies to this position at Kernel?
Kernel lists this role as a Full-time position.
What experience level is required for this role at Kernel?
Kernel is looking for a candidate with "Senior-level" experience level.
What benefits are offered by Kernel for this role?
Kernel offers following benefits: Health Insurance, Dental Insurance, Family/Dependent Health, Flexible/Unlimited PTO, and 401k Matching/Retirement Savings for this position. Actual benefits may vary depending on the employer's policies and employment terms.
What is the process to apply for this position at Kernel?
You can apply for this role at Kernel either through Sonara's automated application system, which helps you submit applications 10X faster with minimal effort, or by applying manually using the direct link on the job page.