[Skip to main content](#main-content) [OpenNash Jobs](https://jobs.opennash.com/) [Hiring report](/reports/hiring/) · [All Fortinet jobs](https://jobs.opennash.com/companies/fortinet/) · [Search jobs](/search/) Fortinet · Sunnyvale, CA # Principal Software Development Engineer Sunnyvale, CA, United States Senior individual contributor $175,000-$245,000 Software Engineering Listed on Fortinet’s official careers site. Posted May 13, 2026. Check that it is still open and apply there. [Apply on Fortinet’s careers site →](https://edel.fa.us2.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_2001/job/22908) [OpenNash Jobs](https://jobs.opennash.com/) / [Fortinet](https://jobs.opennash.com/companies/fortinet/) / Principal Software Development Engineer ## Job description ### Responsibilities Troubleshoot complex, system-level, multi-component issues that across multiple layers from kernel to application. Provide system-level optimizations and improvements in the OS to meet the evolving business requirements. Collaborate with our hardware team to support the delivery of our new platform. Maintain the existing software components, OS related. ### Requirements B.S./M.S. with 8+ years of relevant experience. Hands-on experience with the Linux kernel, debugging, development, performance tuning, etc. Detailed knowledge of Linux kernel, scheduling, VFS, memory management, I/O, etc. Detailed knowledge of Linux network internals, TCP/IP, netfilter, network driver, etc. Good knowledge of processor architecture, x86, arm, etc. Programming skills in C/bash/python/go. Experience with virtualization/container/cloud technologies is preferred. Strong communication skills and ability to work with cross-function teams. Enthusiasm for system-level techniques. US citizenship is required The US base salary range for this full-time position is $175,000-$245,000. Fortinet offers employees a variety of benefits, including medical, dental, vision, life and disability insurance, 401(k), 11 paid holidays, vacation time, and sick time as well as a comprehensive leave program. Wage ranges are based on various factors including the labour market, job type, and job level. Exact salary offers will be determined by factors such as the candidate's subject knowledge, skill level, qualifications, experience, and geographic location. All roles are eligible to participate in the Fortinet equity program, Bonus eligibility is reviewed at the time of hire and annually at the Company’s discretion. ### Why Join Us We encourage candidates from all backgrounds and identities to apply. We offer a supportive work environment and a competitive Total Rewards package to support you with your overall health and financial well-being. Embark on a challenging, enjoyable, and rewarding career journey with Fortinet. Join us in bringing solutions that make a meaningful and lasting impact to our 660,000+ customers around the globe #LI-KL1 #GD ## At a glance - Posted by the employer: May 13, 2026 - First seen by OpenNash: Jul 11, 2026 - Last checked: Oct 18, 2026 - Listed for: 158 days - Location: Sunnyvale, CA, United States - Pay: $175,000-$245,000[Apply on Fortinet’s careers site →](https://edel.fa.us2.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_2001/job/22908) ## More jobs at Fortinet ### [Cloud Security Developer](https://jobs.opennash.com/companies/fortinet/jobs/74bedf36f21ae7317376/) Sunnyvale, CA, United States ### [DevOps Engineer (FortiAppSec)](https://jobs.opennash.com/companies/fortinet/jobs/12aef0d257ab0e42a6c7/) Sunnyvale, CA, United States ### [Embedded Software Engineer](https://jobs.opennash.com/companies/fortinet/jobs/034fded9fef9fef44e38/) Sunnyvale, CA, United States ### [Principal Embedded Software Developer](https://jobs.opennash.com/companies/fortinet/jobs/93494b6997cf95522c75/) Sunnyvale, CA, United States ## Similar jobs at other companies ### [Principal Software Engineer – Mobile Software Architecture](https://jobs.opennash.com/companies/qualcomm/jobs/914589d5d4db917886f4/) Qualcomm · San Diego, California, United States of America ### [Principal Software Engineer](https://jobs.opennash.com/companies/jpmorganchase/jobs/43ddee4b84a577509be8/) JPMorganChase · Seattle, WA, United States ### [Principal Software Engineer](https://jobs.opennash.com/companies/microsoft/jobs/a9b185ca099e0387fa97/) Microsoft · United States, Washington, Redmond ### [Principal Software Engineer](https://jobs.opennash.com/companies/citigroup/jobs/57f0d1514e469a39bd0b/) Citigroup · Jacksonville Florida United States OpenNash lists jobs from employers’ own careers sites and does not handle applications. Dates come from the employer where stated; “first seen” and “last checked” are our own observations. OpenNash Jobs · Official listings with dates and links to the employer. [Weekly hiring report](/reports/hiring/) · [Methodology](/methodology/)