619 principal engineer jobs at 246 companies in Fairfax, CA
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Principal Engineer, Identity Data Security and Trust
Menlo Park, California, United States
$264k-$380k/yr OnsiteFull Time
12+ YOE12+ years software engineering; 5+ years as principal/architect; security, DLP, cloud infra.
Java, Go, C++, AWS, GCP, Azure, TLS, HTTP, DNS
2mo
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Principal Engineer, Hardware
South San Francisco or Atlanta
$275k-$350k/yr OnsiteFull Time
15+ YOE15+ years hardware engineering, system-level ownership, DFM/supplier qualification, field reliability, ISO 26262 familiarity preferred.
6d
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Principal Engineer - Land
Walnut Creek, California, United States
$150k-$190k/yr HybridFull Time
15+ YOEBachelor’s in civil or geotechnical engineering required; 15+ years leading complex geotechnical projects; California PE and GE licenses required; advanced soil and rock mechanics knowledge and U.S. work authorization required.
Microsoft Office Suite, LinkedIn Learning
3mo
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Principal Engineer
San Francisco, California, United States
$285k-$315k/yr HybridFull Time
10+ YOE10+ years software experience; strong architecture leader; experience with large-scale distributed SaaS; AI product experience; cross-functional collaboration.
TypeScript, React, Node.js, Java, Docker, Kubernetes, Google Cloud Platform
1w
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Transportation Principal Engineer
Walnut Creek, California, United States
$180k-$260k/yr HybridFull Time
15+ YOEBachelor's degree in civil or structural engineering, 15 years of transportation engineering experience, Professional Engineer license, and AutoCAD and Civil3D proficiency.
AutoCAD, Civil3D
1mo
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Principal Environmental Engineer
San Diego or Concord or Knoxville or Denver or Norfolk or Canton
$175k-$225k/yr RemoteFull Time
15+ YOEMaster's in Environmental Engineering, PE license, 15+ years environmental engineering experience (DoD/CERCLA), leadership experience on federal remediation projects, ability to travel, strong verbal and written communication.
3w
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Principal Engineer, Online Systems
San Francisco or Palo Alto
$285k-$500k/yr HybridFull Time
12+ YOE12+ years of software engineering experience with distributed systems expertise; proficiency in C++, Java, or Python; technical strategy and cross-functional leadership; bachelor's degree or equivalent experience.
C++, Java, Python, Kubernetes
1w
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Principal BESS Engineer
Scottsdale or San Diego or San Francisco or Houston or Denver or Princeton
$140k-$195k/yr HybridFull Time
8+ YOERequires 8+ years in utility-scale BESS engineering, integration, development, and commissioning; knowledge of electrical, fire safety, interconnection, controls, and utility standards; Excel and Python skills.
Microsoft Excel, Python, TCP/IP, Modbus/TCP, Power Plant Controller, Energy Management Systems (EMS), Battery Management Systems (BMS), SCADA, UL, IEEE, National Electrical Code, NFPA, UL1973, UL9540/A
3w
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Senior Principal Engineer
San Francisco, California, United States
$202k-$318k/yr HybridFull Time
12+ YOE12+ years technical leadership with end-to-end ownership; deep expertise building large-scale systems; hands-on coding; strong judgment on cost/scale; experience influencing leaders and defining technical direction.
3mo
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Principal Engineer - Stablecoin
Jersey City or Seattle or Plano or San Francisco or Charlotte
$157k-$230k/yr HybridFull Time
Experience designing and building secure, scalable financial blockchain apps and smart contracts; multi-cloud, multi-region; cloud providers (AWS, GCP, Azure); web3 protocols; Solidity/Rust; cryptography; DeFi; code reviews and security analysis; integration with external systems.
Solidity, Rust, Web3, Truffle, Hardhat, Remix, Web3.js, Ethers.js, Terraform, AWS, GCP, Azure
3d
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Principal Engineer - Supply Chain Planning
United States or Palo Alto
$1-$50/yr RemoteFull Time
12+ YOERequires 12+ years of software engineering experience, 0-to-1 platform ownership, production ML/AI platform expertise, data systems and API skills, and strong stakeholder communication. Supply chain experience preferred.
AI, LLM, Google Meet, Zoom
3w
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Senior Principal Optoelectronics Engineer
Fremont, California, United States
$166k-$230k/yr OnsiteFull Time
5+ YOEMS/PhD in engineering or science plus 5+ years experience in semiconductor laser design and silicon photonics, NPI experience, cross-functional team management, strong problem solving and communication.
1mo
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Senior Associate Principal Engineer
Union City, California, United States
$155k-$175k/yr OnsiteFull Time
10+ YOEPE license required, Bachelor's in Mechanical Engineering, ~10+ years mechanical design/construction experience, HVAC/plumbing system design knowledge, Revit/CADD/Microsoft Excel skills, strong communication and public speaking.
Revit, CADD, Microsoft Excel
2mo
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Principal Engineer
San Francisco or New York City or United States
$148k-$210k/yr RemoteFull Time
8+ YOE8+ years software engineering experience; deep full‑stack experience with Ruby on Rails and frontend React; Node.js/JavaScript/TypeScript, AWS, MySQL, Elasticsearch, Redis, Resque; strong CS fundamentals, architecture, mentorship, and cross‑functional communication.
Ruby on Rails, React, Node.js, JavaScript, TypeScript, AWS, MySQL, Elasticsearch, Redis, Resque, Go, Python, Java
3d
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Client Reference Data Solutions Principal Engineer
San Francisco, California, United States
$191k-$305k/yr HybridFull Time
7+ YOERequires 7+ years of engineering experience, 3+ years with AI products, 5+ years in multidiscipline data design and replication, 7+ years in data profiling and metadata management, and 7+ years in financial services.
ChatGPT, Claude, Devin, Gemini, Apache Spark, Flink, MongoDB, Cassandra, HBase, Kafka, RDF, OWL, Neo4j, NoSQL
2mo
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Principal Software Engineer
San Francisco, California, United States
RemoteFull Time
15+ YOE15+ years in distributed systems/infra; Go or Python; Kubernetes and Terraform; incident commander; cloud migrations; OpenTelemetry; Azure/AKS; on-call leadership.
Go, Python, Kubernetes, Terraform, AKS, Azure DevOps, GitHub Actions, OpenTelemetry
1mo
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Chief Engineer (Principal Engineer)
San Francisco, California, United States
$335k-$375k/yr OnsiteFull Time
Principal-level engineer with strong production systems experience, deep AI/agent fluency, 0→1 and scale experience, BS/BA in Computer Science required (MS/PhD preferred), San Francisco onsite commitment.
Claude Code, Cursor
4d
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Principal Engineer, Core - Pinner Journeys
San Francisco or United States or Seattle or Palo Alto
$243k-$450k/yr RemoteFull Time
15+ YOE15+ years in large-scale systems or machine learning; principal-level technical leadership; deep retrieval, ranking, search, representation learning, or generative AI expertise; bachelor's degree or equivalent experience.
AI, Machine Learning, Homefeed, Search, AI Assistant, Large Language Models (LLMs), Foundation Models, Learning-to-Rank, RL, Embeddings, RAG
2w
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Distinguished Principal Engineer - AI Science
San Francisco, California, United States
$225k-$250k/yr OnsiteFull Time
10+ YOE10+ years data science/ML experience, 3+ years technical lead, expert in ML theory and optimization, strong coding in Python/Scala/Java/R and SQL, quantitative degree (BS/MS/PhD).
Python, Scala, Java, R, SQL
3mo
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Principal AI Platform Engineer
San Francisco or Toronto or Montreal or United States or Canada
RemoteFull Time
10+ YOE10+ years software engineering experience, 3+ years building ML/LLM systems, strong Python backend skills, platform engineering and developer-experience experience, technical leadership at Principal level.
Python, MCP, LangGraph, LlamaIndex, Langfuse, LangSmith, Braintrust
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