Senior Software Engineer, CAPE
Crusoe · San Francisco, CA · Software engineering · posted 3 days ago
Crusoe · San Francisco, CA · posted 34 days ago
By AtiveSite · Published 07/11/2026 · Updated 09/11/2026 · Every figure is linked to its source below.
| Employer | Crusoe |
|---|---|
| Location | San Francisco, California |
| Field | Technology › Cybersecurity |
| Level | not stated |
| Source category | Cloud Engineering, Cloud Compute |
| Posted | 2026-10-06 (34 days ago) |
| Work arrangement | On-site at the location listed |
| Pay | Not published in the source listing |
Crusoe is on a mission to accelerate the abundance of energy and intelligence. As the only vertically integrated AI infrastructure company built from the ground up, we own and operate each layer of the stack — from electrons to tokens — to power the world's most ambitious AI workloads. When you join Crusoe, you join a team that is building the future, faster.
We're in the midst of the greatest industrial revolution of our time. The demand for AI compute is boundless, and power is a bottleneck. We're solving that — with an energy-first approach that makes AI infrastructure better for the world and faster for the people innovating with AI.
We're looking for problem-solving, opportunity-finding teammates with a sense of urgency, who believe in the scale of our ambition and thrive on a path not fully paved — people who want to grow their careers alongside a team of experts across energy, manufacturing, data center construction, and cloud services.
If you want to do the most meaningful work of your career, help our customers and partners advance their AI strategies, and be part of a high-performing team that believes in each other, come build with us at Crusoe.
About the Role:
The Crusoe Cloud Software Development team is seeking a passionate and experienced Staff Software Engineer specializing in Linux Kernel Security. This critical role is essential in strengthening the security posture of our core Linux kernel and operating system components, which underpin our cutting-edge hardware and software solutions for the AI cloud. A deep understanding of Linux kernel internals, security vulnerabilities, mitigation techniques, and secure development practices is paramount for developing reliable, high-assurance systems. This is a full-time position.
What You'll Be Working On:
Kernel Hardening & CVE Triage: Implement kernel security enhancements, manage configuration hardening, and triage incoming CVEs to assess severity and exploitability.
Access Control, Boot Security & Guardrails: Enforce mandatory access controls, secure the boot path, and establish CI guardrails and fuzzing coverage to prevent regressions.
Vulnerability Research & Analysis: Research vulnerabilities across kernel, driver, and OS components to build proactive mitigations and backport non-trivial upstream fixes to production.
Secure Development Practices: Establish and advocate for secure coding standards and best practices for kernel-level development. Conduct security-focused code reviews to identify and eliminate potential vulnerabilities early in the development lifecycle.
Security Auditing & Tools: Utilize and develop specialized tools for kernel security auditing, fuzzing, static analysis, and dynamic analysis to uncover hidden vulnerabilities and ensure compliance with security policies.
Incident Response Support: Provide expert support during security incidents involving kernel or OS-level compromises, assisting with root-cause analysis, containment, and recovery efforts.
Performance and Security Balance: Work to ensure that security enhancements do not unduly impact system performance, especially critical for our high-performance AI infrastructure.
First 90 days: Own kernel CVE triage end to end and have shipped at least one backported fix through our full release path. You have an independent read on where our kernel configuration is weakest.
First year: Kernel security response has a defined SLA by severity and we consistently hit it. A hardening baseline is defined, enforced in CI, and rolled out across supported SKUs. Cloud Hypervisor has been audited and the highest-value isolation gaps are closed or scheduled.
Cloud Hypervisor & Isolation: Audit, harden, and reduce privilege across Cloud Hypervisor device models and vhost-user datapaths, contributing upstream security fixes and advancing confidential computing primitives (AMD SEV-SNP, Intel TDX).
Cross-Functional Collaboration: Collaborate closely with other engineering teams (hardware, hypervisor, OS development, cloud infrastructure, and security operations) to integrate security best practices and ensure a comprehensive security strategy across the stack.
Technical Leadership: Provide technical guidance and mentorship to junior engineers on kernel security best practices, fostering a culture of security awareness and excellence.
Debugging and Root-Cause Analysis: Debug and root-cause a variety of complex security-related issues at the kernel level.
What You'll Bring to the Team:
Linux Kernel Security Expertise: Proven deep knowledge of Linux kernel internals (e.g., memory management, process scheduling, system calls, I/O subsystems) with a strong focus on security aspects.
Vulnerability & Exploitation Knowledge: Solid understanding of common kernel vulnerabilities (e.g., privilege escalation, information disclosure, denial of service) and associated exploitation techniques.
Security Mitigations: Experience with existing Linux kernel security mitigations (e.g., ASLR, DEP/NX, SMEP/SMAP, KASLR, namespaces, cgroups, LSMs like SELinux/AppArmor).
Secure Coding: Strong background in secure coding principles and experience conducting security-focused code reviews, particularly in C.
Debugging & Analysis Tools: Proficiency with kernel debugging tools (e.g., GDB, crash, kgdb) and security analysis tools (e.g., valgrind, address sanitizers, fuzzers).
Hardware Security Concepts: Familiarity with hardware-assisted security features (e.g., Intel SGX, AMD SEV, ARM TrustZone) and their relevance to kernel security.
Education & Experience: Bachelor's degree in Computer Science, Computer Engineering, or a related field, and a minimum of 5 years of relevant industry experience with at least 3 years focused on low-level operating systems or kernel security.
Safety and Compliance: Must be able to pass a background check.
Company Values: Embody the Company values.
Experience dealing with CVE Remediation and automation
First 90 days: You own kernel CVE triage end to end and have shipped at least one backported fix through our full release path. You have an independent read on where our kernel configuration is weakest.
First year: Kernel security response has a defined SLA by severity and we consistently hit it. A hardening baseline is defined, enforced in CI, and rolled out across supported SKUs. Cloud Hypervisor has been audited and the highest-value isolation gaps are closed or scheduled.
Bonus Points
Experience with specific kernel security projects or contributions to open-source kernel security initiatives.
Familiarity with hypervisor security and the interaction between the hypervisor and the guest kernel's security.
Experience with hardware security modules (HSMs) or Trusted Platform Modules (TPMs).
Background in offensive security or penetration testing at the kernel level.
Benefits:
Competitive compensation and equity packages
Restricted Stock Units
Paid time off, paid holidays & leave of absence programs
Comprehensive health, dental & vision insurance
Employer contributions to HSA account
Paid parental leave
Paid life insurance, short-term and long-term disability
Professional development & tuition reimbursement
Mental health & wellness support
Commuter benefits (parking & transit)
Cell phone stipend
401(k) Retirement plan with company match up to 4% of salary
Volunteer time off
Global travel insurance & emergency assistance
Daily meals allowance
Additional perks & programs specific to location
Compensation Range
Compensation will be paid in the range of up to $215,000 -$260,000 + Bonus. Restricted Stock Units are included in all offers. Compensation to be determined by the applicant's knowledge, education, and abilities, as well as internal equity and alignment with market data.
Crusoe is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, disability, genetic information, pregnancy, citizenship, marital status, sex/gender, sexual preference/ orientation, gender identity, age, veteran status, national origin, or any other status protected by law or regulation.
Field: Technology Sub-niche: Cybersecurity All jobs at Crusoe Jobs in California Jobs in San Francisco, CA San Francisco city guide California state guide San Francisco County economy
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This is a — role in the Technology field (Cybersecurity) at Crusoe.
We could not match this job title to one occupation in the official wage statistics, so no pay estimate is shown. Pay is not in the source listing; ask the employer for the range and compare in the 240 job niches.
Estimate for a wage earner: 2026 federal brackets and standard deduction (IRS), Social Security 6.2% up to $184,500, Medicare 1.45% (+0.9% above $200,000 single / $250,000 married), and a state rate you set; set your own state tax rate. It ignores credits, pre-tax deductions, local taxes and benefits. Sources: IRS: tax year 2026 inflation adjustments · SSA wage base per Federal Register notice 2025-19763.
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The job is in San Francisco, CA. Below is what the official statistics say about living and working there.
How San Francisco compares. Among the 145 largest places in California, San Francisco is #4 by population, #139 for homeownership (#1 = highest), #20 for remote work (#1 = most), #25 for college degrees (#1 = most). Its county, San Francisco County, is #3 of 58 counties for average pay ($174,103).
San Francisco has 830,235 residents (ACS 2020–2024), about 2.1% of the population of California. It covers 47 square miles of land, which works out to roughly 17,784 people per square mile. The median age is 40.0, 6% older than the state median (40.0 against 37.9).
The median gross rent is $2,476 a month (rent plus utilities), 22% above the state median ($2,476 against $2,036). Over a year that is 21.1% of the median household income. US housing guidance treats housing as affordable when it takes 30% of income or less, so the typical household is under that line. The median home value is $1,394,500, which is 9.9 times the median household income ($140,970); a ratio above 5 usually means buying is out of reach without savings or a second income. 38.2% of households own their home, 32% below the state average (38.2% against 55.9%). A low ownership share points to a rental-heavy market with more apartments and shorter stays.
The San Francisco-Oakland-Fremont, CA metropolitan area has 2,373,920 jobs in the BLS wage survey, and the median pay across all occupations is $74,260 a year, 46% above the national median ($74,260 against $50,980). The biggest occupation groups are office and administrative support (226,320 jobs, median $62,120); management (223,100 jobs, median $176,340); business and financial operations (207,030 jobs, median $112,960). The area is most specialised in computer and mathematical (1.9 times) and life, physical, and social science (1.8 times), where the share of workers is well above the national share. The best-paying groups with at least 5,000 jobs are management ($176,340) and computer and mathematical ($167,770). In 2026M09 the unemployment rate of San Francisco County was 4.0%. 69.6% of residents aged 16 and over are in the labour force. The city lies in San Francisco County; its jobs, pay by industry and GDP are on the county page.
Among workers, 28.6% drive alone, 18.7% use public transit, 9.3% walk, 31.0% work from home. 21.6% of workers commute 45 minutes or more, 11% above the state average (21.6% against 19.4%). Remote work is more common than in the state as a whole, which widens the set of employers a resident can work for without moving.
60.3% of adults aged 25 and over hold a bachelor's degree or higher, 63% above the state share (60.3% against 37.1%). 34.0% of residents were born outside the United States, 26% above the state share (34.0% against 27.0%). The poverty rate is 11.2%, 7% below the state rate (11.2% against 12.0%).
The warmest month is Sep, averaging 59°F (14.9°C), and the coolest is Apr at 53°F (11.6°C). About 515 mm (20 inches) of precipitation falls in a year; Dec is the wettest month (112 mm) and Jul the driest (2 mm). These values come from NASA satellite-based climatology on a grid of about 50 km, so they describe the wider area, not a weather station in the city.
Closest cities in this guide: Daly City (31 miles, rent 3% higher); Pacifica (31 miles, rent 25% higher); San Bruno (34 miles, rent 12% higher); Millbrae (36 miles, rent 32% higher). Rent differences are against San Francisco; use the Compare tab to put any two cities side by side.
Full guide to San Francisco →California guideAll jobs in San Francisco
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Places within 50 miles (straight line) of San Francisco, CA that have a guide, with what living there costs. No pay estimate is shown because the title did not match one occupation.
| Place ⇅ | Distance from the job city ⇅ | Median rent ⇅ | Median home value ⇅ | Median household income ⇅ | Commute 45+ min ⇅ | Rent as % of occupation pay ⇅ | Open jobs there ⇅ |
|---|---|---|---|---|---|---|---|
| San Francisco, CA | 0 mi | $2,476 | $1,394,500 | $140,970 | 21.6% | n/a | Jobs |
| Daly City, CA | 31 mi | $2,551 | $1,115,000 | $123,547 | 19.6% | n/a | Jobs |
| Pacifica, CA | 31 mi | $3,098 | $1,249,800 | $160,523 | 15.5% | n/a | — |
| San Bruno, CA | 34 mi | $2,773 | $1,207,500 | $141,272 | 12.2% | n/a | — |
| Millbrae, CA | 36 mi | $3,272 | $1,934,900 | $163,476 | 21.8% | n/a | Jobs |
| Brisbane, CA | 36 mi | $2,574 | $1,232,200 | $156,169 | 29.8% | n/a | — |
| South San Francisco, CA | 36 mi | $2,802 | $1,188,800 | $136,578 | 15.2% | n/a | Jobs |
| Half Moon Bay, CA | 37 mi | $2,433 | $1,549,500 | $157,884 | 26.7% | n/a | — |
| Burlingame, CA | 38 mi | $2,785 | $2,000,001 | $174,000 | 23.1% | n/a | Jobs |
| Richmond, CA | 40 mi | $1,960 | $668,200 | $95,391 | 28.8% | n/a | — |
| San Mateo, CA | 41 mi | $3,077 | $1,618,700 | $153,504 | 15.8% | n/a | Jobs |
| Berkeley, CA | 41 mi | $2,133 | $1,413,900 | $108,092 | 20.8% | n/a | Jobs |
| Alameda, CA | 42 mi | $2,474 | $1,235,700 | $137,697 | 27.3% | n/a | Jobs |
| Belmont, CA | 43 mi | $2,875 | $2,000,001 | $205,297 | 18.6% | n/a | Jobs |
| Oakland, CA | 44 mi | $1,979 | $929,900 | $101,600 | 21.9% | n/a | Jobs |
| Foster City, CA | 44 mi | $3,501 | $1,838,200 | $199,143 | 20.6% | n/a | Jobs |
| San Carlos, CA | 45 mi | $2,854 | $2,000,001 | $237,470 | 14.9% | n/a | Jobs |
| Redwood City, CA | 47 mi | $2,968 | $1,801,700 | $157,814 | 10.2% | n/a | Jobs |
| San Leandro, CA | 48 mi | $2,186 | $844,200 | $101,420 | 23.7% | n/a | — |
| Atherton, CA | 49 mi | $3,501 | $2,000,001 | $250,001 | 7.0% | n/a | — |
We could not match this title to one occupation, so here are the other sub-niches in Technology, where your skills may carry over:
Data, analytics and AI (3366) Software engineering (4089) Cloud, IT and infrastructure (1040) Product management (836)
How far San Francisco, CA is from the 20 largest US cities, in straight-line miles (not driving distance). Click a column to sort.
| From ⇅ | Straight-line distance (miles) ⇅ | Population of that city ⇅ |
|---|---|---|
| San Francisco, CA | 0 mi | 830,235 |
| San Jose, CA | 73 mi | 990,138 |
| Los Angeles, CA | 364 mi | 3,857,263 |
| San Diego, CA | 475 mi | 1,389,526 |
| Phoenix, AZ | 678 mi | 1,642,323 |
| Seattle, WA | 684 mi | 754,195 |
| Denver, CO | 986 mi | 718,877 |
| Oklahoma City, OK | 1,420 mi | 697,125 |
| Fort Worth, TX | 1,484 mi | 963,194 |
| Dallas, TX | 1,515 mi | 1,307,930 |
| San Antonio, TX | 1,516 mi | 1,479,835 |
| Austin, TX | 1,530 mi | 979,539 |
| Houston, TX | 1,673 mi | 2,328,253 |
| Chicago, IL | 1,885 mi | 2,711,226 |
| Indianapolis, IN | 1,979 mi | 885,860 |
| Columbus, OH | 2,142 mi | 914,802 |
| Charlotte, NC | 2,332 mi | 903,844 |
| Jacksonville, FL | 2,403 mi | 977,670 |
| Philadelphia, PA | 2,550 mi | 1,579,706 |
| New York, NY | 2,602 mi | 8,483,844 |
| City ⇅ | Straight-line distance ⇅ | Open jobs ⇅ |
|---|---|---|
| Alameda, CA | 42 mi | 38 |
| Belmont, CA | 43 mi | 2 |
| Redwood City, CA | 47 mi | 45 |
| Palo Alto, CA | 54 mi | 298 |
| Sunnyvale, CA | 60 mi | 83 |
| Fremont, CA | 62 mi | 6 |
| Pleasanton, CA | 63 mi | 6 |
| Milpitas, CA | 66 mi | 2 |
| Campbell, CA | 67 mi | 7 |
| San Jose, CA | 73 mi | 698 |
| Capitola, CA | 79 mi | 1 |
| Sacramento, CA | 103 mi | 53 |
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A private-sector role in technology (cybersecurity) listed 34 days ago. The full description is on this page and on the employer's page.
San Francisco, CA.
Use the "View this job and apply on the employer's page" button. AtiveSite does not receive applications.
The listing does not publish pay, and we could not match the title to one official occupation.
Median rent in San Francisco is $2,476 a month and median household income $140,970 (ACS 2020–2024).
It was posted on 2026-10-06 (34 days ago). Jobs older than 90 days are not shown.
Yes: browse cybersecurity jobs in California.
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