ESXi CPU Server Architect/ SW Engineer

Job Description

Job Description

ESXi CPU Server Architect/ SW Engineer Overview: Our team focuses on the virtualization technology of ESXi, a specialized operating system and infrastructure designed specifically for hosting virtual machines. This role is part of the ESXi-x86 kernel development team, which is responsible for supporting the x86 architecture and handling all aspects of hypervisor software development on Intel/AMD x86 hardware.

The ESXi-x86 team is in charge of the core CPU, hardware platforms (including bring-ups, boot processes, chipsets, drivers, and development kits), and virtualization (virtual platforms). We collaborate directly with Intel, AMD, and other partners to explore and integrate new technologies. The team works closely with other departments and business units to provide comprehensive support for a broad spectrum of technologies, while also engaging in research to design and implement future-proof capabilities for the hypervisor. Maintaining a high standard of quality, the team also works with customers to troubleshoot and resolve issues as needed.

Role Overview: As an engineer in this position, you will be working on large-scale system and hardware enablement projects focused on x86-based CPUs and servers. You will collaborate with various teams to develop a cohesive platform that integrates seamlessly with ESXi. Strong expertise in x86 CPU architecture is essential. You should be comfortable with all technical aspects of the project and able to represent the team both internally and externally, including interactions with partners. Additionally, you will work closely with engineers from partner software development teams to jointly create solutions for ESXi. You’ll be part of a highly motivated technical team working across the full stack, from bootloaders to configuration scripts, with a focus on innovation and new solutions.

Key Qualifications:

• MS or PhD in Computer Science, Computer Engineering, or related field, or a BS with substantial experience in operating systems (at least 10 years in software development or significant open-source contributions).
• Proficiency in C programming with recent hands-on coding experience.
• Strong understanding of modern microprocessor architectures (including multiprocessor programming, cache systems, and barriers). Experience with Intel CPUs is a significant plus.
• Experience with version control and collaborative code review tools such as Git, Gerrit, and Perforce.
• Knowledge of build processes, including the ability to debug issues with makefiles, build systems, and Linux shell scripts.
• Solid knowledge of operating systems and kernel internals (Linux, BSD, Windows NT, etc.).
• Familiarity with modern computer systems, particularly in the realm of I/O (x86 PCs or server-class hardware, including PCI, ACPI, IOMMUs, DMA, UEFI).
• Self-starter who can work effectively both independently and as part of a team.
• Excellent communication skills, both written and verbal.

Preferred Experience:

• Experience with assembly programming (x86, Arm, or other RISC architectures).
• Familiarity with virtualization platforms such as ESXi, KVM, or Hyper-V.
• Experience with hardware bring-ups, including CPUs, bootloaders, chipsets, SMP/NUMA configurations, interrupt controllers, SMMUs, and PCIe issues.
• Experience with kernel performance analysis and optimization.

Estimated Min Rate : $220,000/Annually 
Estimated Max Rate : $240,000/Annually 

What’s In It for You?
We welcome you to be a part of the largest and legendary global staffing companies to meet your career aspirations. Yoh’s network of client companies has been employing professionals like you for over 65 years in the U.S., UK and Canada. Join Yoh’s extensive talent community that will provide you with access to Yoh’s vast network of opportunities and gain access to this exclusive opportunity available to you. Benefit eligibility is in accordance with applicable laws and client requirements. Benefits include:

• Medical, Prescription, Dental & Vision Benefits (for employees working 20+ hours per week)
• Health Savings Account (HSA) (for employees working 20+ hours per week)
• Life & Disability Insurance (for employees working 20+ hours per week)
• MetLife Voluntary Benefits
• Employee Assistance Program (EAP)
• 401K Retirement Savings Plan
• Direct Deposit & weekly epayroll
• Referral Bonus Programs
• Certification and training opportunities

Note: Any pay ranges displayed are estimations. Actual pay is determined by an applicant's experience, technical expertise, and other qualifications as listed in the job description. All qualified applicants are welcome to apply.

Yoh, a Day & Zimmermann company, is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

Visit -with-disabilities to contact us if you are an individual with a disability and require accommodation in the application process.

For California applicants, qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. All of the material job duties described in this posting are job duties for which a criminal history may have a direct, adverse, and negative relationship potentially resulting in the withdrawal of a conditional offer of employment.

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

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\nCompany Description

Yoh delivers expertise, methodology, and momentum to keep work moving forward. From strategy to execution, we deliver bold ideas and big results through consulting, staffing, and enterprise solutions. Nearly a century after our founding, Yoh remains STEM-centered, collaborative, and committed to client success. Yoh is a proud member of the Day & Zimmermann family of companies. Visit us at

Company Description

Yoh delivers expertise, methodology, and momentum to keep work moving forward. From strategy to execution, we deliver bold ideas and big results through consulting, staffing, and enterprise solutions. Nearly a century after our founding, Yoh remains STEM-centered, collaborative, and committed to client success. Yoh is a proud member of the Day & Zimmermann family of companies. Visit us at