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Performance Engineer Jobs in California (NOW HIRING)

Fuel Performance Engineer

Santa Clara, CA · On-site

$120K - $165K/yr

We are searching for a Fuel Performance Engineer to join our team. Position Description Fuel Performance Engineers at Oklo are responsible for the fuel performance analyses and verification of ...

Fuel Performance Engineer

Santa Clara, CA · On-site +1

$120K - $165K/yr

We are searching for a Fuel Performance Engineer to join our team. Position Description Fuel Performance Engineers at Oklo are responsible for the fuel performance analyses and verification of ...

We're seeking a GPU Performance Engineer to squeeze every last FLOP from our H100 infrastructure and optimize our model serving stack to its absolute limits. The Role You'll be our performance ...

About the Role As a Training Performance Engineer, you'll drive efficiency improvements across our distributed training stack. You'll analyze large-scale training runs, identify utilization gaps, and ...

As a GPU Performance Engineer, you'll architect and implement the foundational systems that power Claude and push the frontiers of what's possible with large language models. You'll be responsible ...

We're seeking a GPU Performance Engineer to squeeze every last FLOP from our H100 infrastructure and optimize our model serving stack to its absolute limits. The Role You'll be our performance ...

The System Performance Engineer is responsible for wireless carrier system performance. This position supports technical activities for the ongoing maintenance and monitoring of wireless systems.

We are looking for passionate GPU performance modeling engineers that will help shape the architecture of future Adreno GPUs for Qualcomm Snapdragon compute platforms across smartphones, Windows PCs ...

The Team The System Engineering Performance team architects and optimizes high-performance infrastructure for large-scale datacenter deployments. The team works across hardware, software, networking ...

Android Performance Engineer Location: Cupertino, CA (Hybrid) Duration: 12+ Months Android Performance Engineer (AI & Automation) We''re looking for a Senior Android Performance Engineer to ensure ...

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Performance Engineer information

See California salary details

$10

$59

$96

How much do performance engineer jobs pay per hour?

As of Jun 10, 2026, the average hourly pay for performance engineer in California is $59.32, according to ZipRecruiter salary data. Most workers in this role earn between $48.65 and $67.12 per hour, depending on experience, location, and employer.

What is the difference between Performance Engineer vs Software Test Engineer?

AspectPerformance EngineerSoftware Test Engineer
Primary FocusOptimizing system performance, load testing, scalabilityFunctional testing, bug identification, feature validation
Required SkillsPerformance testing tools, scripting, system analysisTest case design, automation, defect tracking
Work EnvironmentDevelopment teams, QA, DevOpsQA teams, development teams
CertificationsPerformance testing certifications (e.g., JMeter, LoadRunner)ISTQB, software testing certifications

Performance Engineers focus on system performance, scalability, and load testing, ensuring applications run efficiently under stress. Software Test Engineers primarily verify functionality and identify bugs. While both roles require testing skills, Performance Engineers specialize in performance metrics and optimization, making their roles complementary but distinct.

What are the key skills and qualifications needed to thrive as a Performance Engineer, and why are they important?

To thrive as a Performance Engineer, you need strong analytical abilities, a solid understanding of software architecture, and experience with load testing and profiling, often supported by a degree in computer science or a related field. Familiarity with tools such as JMeter, LoadRunner, New Relic, and monitoring systems, as well as scripting languages, is typically required. Excellent problem-solving, attention to detail, and effective communication skills help distinguish top performers in this role. These skills and qualities are crucial for identifying system bottlenecks, optimizing performance, and ensuring a seamless user experience.

What is a Performance Engineer?

A Performance Engineer is a professional who ensures that software applications and systems run efficiently and meet performance requirements. They analyze, test, and optimize system performance by identifying bottlenecks, conducting load and stress testing, and recommending improvements. Performance Engineers work closely with development and operations teams to ensure that applications can handle expected user loads and deliver a smooth user experience. Their work is crucial in preventing slowdowns, crashes, and other performance-related issues in production environments.

What Is Performance Engineering?

Performance engineering is the development of software solutions for specific business problems. As a performance engineer, your responsibilities are to identify issues, whether for a particular company or an industry, and develop software that directly addresses them. To become a performance engineer, you need a bachelor’s degree in computer science or computer engineering, two to five years of information technology (IT) work experience, and excellent problem solving skills. Organizations like HyPerformix offer professional certifications, like their Enterprise Performance Engineering program, which can significantly boost your qualifications. Your additional job duties include performing routine maintenance and service, experimenting with possible solutions in the test environment, and monitoring system performance.

What are some common challenges Performance Engineers face when optimizing complex systems?

Performance Engineers often encounter challenges such as identifying bottlenecks in multi-tiered or distributed systems, balancing trade-offs between speed and resource consumption, and ensuring that performance improvements do not compromise system reliability. They frequently work with cross-functional teams, requiring strong communication skills to translate technical findings into actionable recommendations. Staying up-to-date with evolving tools and best practices is also essential, as technology stacks and performance benchmarks continually change.
What are the most commonly searched types of Performance Engineer jobs in California? The most popular types of Performance Engineer jobs in California are:
What job categories do people searching Performance Engineer jobs in California look for? The top searched job categories for Performance Engineer jobs in California are:
What cities in California are hiring for Performance Engineer jobs? Cities in California with the most Performance Engineer job openings:
Infographic showing various Performance Engineer job openings in California as of June 2026, with employment types broken down into 98% Full Time, and 2% Contract. Highlights an 87% Physical, 5% Hybrid, and 8% Remote job distribution, with an average salary of $123,381 per year, or $59.3 per hour.
Fuel Performance Engineer

Fuel Performance Engineer

Oklo

Santa Clara, CA • On-site

$120K - $165K/yr

Other

Medical, Retirement

Posted 23 days ago


Job description

Thanks for your interest in Oklo!  We are searching for a Fuel Performance Engineer to join our team. 

Position Description

Fuel Performance Engineers at Oklo are responsible for the fuel performance analyses and verification of current and future fuel design for Oklo's Aurora powerhouses. This includes engineering analyses, modeling and simulation, clear and thorough documentation of the analyses, as well as interfacing with our reactor design, fuel fabrication, and licensing teams.

Specific responsibilities may include:

  • Analyzing current and novel fuel design performance across expected operating conditions and postulated off-normal conditions.
  • Devising analysis methodologies that efficiently and effectively build confidence in a design, which can include software development of modeling and simulation tools.
  • Verification and validation of modeling and simulation tools in support of analyses.
  • Supporting experimental fuel campaigns.
  • Collaborating cross-functionally to provide technical feedback to design teams.
  • Documenting work using modern tools and techniques, and writing well-written, thoughtful technical reports.

Competencies

We are looking for a Fuel Performance Engineer that is:

  • Passionate about clean energy and making advanced fission a reality
  • Willing and able to learn quickly and adapt to evolving challenges
  • Eager to work in a dynamic team, receive constructive feedback, and grow with us
  • Comfortable in a fast-paced, highly iterative startup environment where we think differently and do things in new ways
  • Excited to think creatively, critically, and reflectively about the problems they are solving 
  • Willing to propose novel and creative solutions to technical problems

Minimum Qualifications

  • Bachelor's degree in engineering, plus 3 years of experience
  • Experience with multi-physics system performance analyses
  • Experience with finite element simulation software (e.g., Ansys, Abaqus)
  • Experience with material analysis
  • Experience with object-oriented programming language (e.g., Python, C++)

Bonus Qualifications

  • Experience with nuclear fuel performance analysis
  • Familiarity with metallic fuels
  • Experience with fuel analysis and fuel performance software (e.g., BISON, LIFE-METAL, etc.)
  • Experience in material selection and material analysis
  • Fluency in Python

Who you are:

A startup person: You aren't driven by titles or hierarchy, and prefer efficiency to excess process. You don't need or expect to have a lot of guidance but you enjoy working in a fast-paced team. If you prefer the culture and feel of a large organization, that is great, but you likely won't enjoy working with us! There is plenty of important work and plenty of good opportunities with organizations like that.

Motivated: You are self-motivated. You bring an enthusiasm to the team, and imbue a sense of passion that goes beyond clocking in and clocking out. This isn't about a fake or arbitrary "pieces of flair" mentality or lack of work-life balance! It is about being a part of the vision and feeling a part of reaching team goals.

A team-player: Oklo genuinely is a team. We aren't about taking credit for ourselves, and we aren't about pushing blame to others. We do incredible things because we work as a team.

An excellent communicator: We need a person who is not only technically competent but also a clear and upbeat communicator.

Creative: Being creative means that when things fall outside clear scopes or processes or problems arise without clear solutions, you are able to identify it as well as invent ways to solve a problem or fill a need without micromanagement. The successful person in this job will not only be creative, but also enjoy being creative and solving open-ended problems which may change day-by-day.

Detail-oriented: This focus is a big part of excellence, consistency, and quality. Excellent grammar and spelling matter for both good communication as well as the image of the company that we put forward.

About Oklo travel requirements:

Oklo requires remote employees to travel to headquarters (Santa Clara, CA) twice a quarter annually, based on business or team needs, including attendance at team meetings, off-sites, and other company events or gatherings. For the first two weeks of onboarding, employees are required to be in person at headquarters in Santa Clara, CA.

About Oklo compensation:

Salary: $120,000-$165,000

Salary may fall outside of the range provided and will be dependent on applicant experience.

Oklo offers flexible time off, equity, competitive pay, 401k, health insurance, FSA, flexible work hours, and other benefits.

We are looking to fill this position immediately!


About Oklo Inc.: Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho National Laboratory, and submitted the first custom combined license application for an advanced reactor to the U.S. Nuclear Regulatory Commission. Oklo is also developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and U.S. National Laboratories.

#CHOP: Oklo's Values
Collaboration: We go further, together. We bring diverse perspectives, listen actively, and build trust through transparency and respect. We work across disciplines, sharing ownership to turn complex challenges into shared successes.
Humility: We are team players who act for the good of the company and for the world. We are focused on our mission, not personal recognition.
Ownership: We take pride in what we do and how we do it. We are proactive in finding solutions and see tasks through  to completion. We are committed to delivering on our promises to provide clean, reliable, and affordable energy.
Pathfinding: We chart new ground where no path exists by approaching challenges with curiosity, courage, and creativity while navigating ambiguity.