ESXi CPU Server Architect​/SW Engineer

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 supports the x86 architecture and handles all aspects of hypervisor software development on Intel/AMD x86 hardware.

We are in charge of core CPU, hardware platforms, and virtualization. We collaborate with Intel, AMD, and partners to integrate new technologies. We work closely with other departments and business units to support a broad spectrum of technologies and research future‑proof capabilities for the hypervisor. We also troubleshoot and resolve issues with customers as needed.

As an engineer, you will work 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 with ESXi. You need strong expertise in x86 CPU architecture, comfort with all technical aspects of the project, and ability to represent the team internally and externally, including partner interactions.

You will work with partner software development teams to jointly create solutions for ESXi, across the full stack from bootloaders to configuration scripts.

• MS or PhD in Computer Science, Computer Engineering, or related field, or a BS with at least 10 years of 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 debugging 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, especially I/O (x86 PCs or server‑class hardware, PCI, ACPI, IOMMUs, DMA, UEFI).
• Self‑starter who can work effectively independently and as part of a team.
• Excellent communication skills, both written and verbal.

• 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

• 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)
• Met Life Voluntary Benefits
• Employee Assistance Program (EAP)
• 401(k) Retirement Savings Plan
• Direct Deposit & weekly epayroll
• Referral Bonus Programs
• Certification and training opportunities

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 for accommodation requests.

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 and the California Fair Chance Act. All material job duties described in this posting have a direct, adverse, and negative relationship with a criminal history that may result in withdrawal of the offer.

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment.

We will never ask candidates to pay fees, purchase equipment, send gift cards, or transfer funds as part of the recruiting or hiring process.