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35 principle developer jobs at 31 companies in Fairfield, CA

1mo
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Principle System Integration Engineer
Fremont, California, United States
$114k-$196k/yr OnsiteFull Time
Coherent
CoherentNYSE: COHR: Manufactures lasers, engineered materials, and optical networking components.
7+ YOEB.S. or M.S. in electrical engineering, physics, optics, computer engineering; 7+ years in technical marketing, customer engineering, systems engineering, or TPM for optical transceivers or datacenter hardware; strong cross-functional leadership; 800G/1.6T experience preferred.
CMIS, telemetry, DDM, power and thermal analysis, interoperability testing
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1mo
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Principle Software Engineer - Ads
San Francisco, California, United States
$269k-$395k/yr OnsiteFull Time
DoorDash
DoorDashNASDAQ: DASH: On-demand delivery platform connecting consumers with local merchants.
12+ YOE12+ years in distributed systems; leadership of large-scale platform initiatives; hands-on architecture decisions; ads infrastructure experience preferred.
Distributed systems, Real-time serving infrastructure, Data pipelines, Low latency systems
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2mo
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Principle Software Engineer, AI Observability & Evals Platform
Boston or San Francisco or New York City
$230k-$270k/yr OnsiteFull Time
LangChain
LangChain: Tools for building and deploying production-ready AI agents.
10+ YOE10+ years backend or full-stack engineering; strong Python/Go; TypeScript/React; architectural decisions; reliable, scalable systems; mentoring.
Python, Go, TypeScript, React
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1mo
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Sr Lead Software Engineer - CAFE
Houston or San Francisco or Seattle
$171k-$260k/yr OnsiteFull Time
JPMorgan Chase
JPMorgan ChaseNYSE: JPM: Global financial services firm providing banking and investment solutions.
5+ YOE5+ years software engineering experience with formal training; expertise in system design, application development, cloud-native principles, Ansible, Windows/Linux, SCCM, PowerShell, and enterprise automation; experience with AI-assisted development tools and technical leadership.
Ansible, Microsoft Windows, Linux, Microsoft System Center Configuration Manager (SCCM), Microsoft PowerShell, GitHub, AWS, Azure
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3mo
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Software Engineer
San Francisco, California, United States
RemoteContract
Polymath
Polymath: Applied research lab developing autonomous AI agent simulation environments.
Strong engineering fundamentals; ability to build from first principles; high agency; shipping mindset; robust systems.
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2mo
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Senior R&D Engineer
San Francisco, California, United States
OnsiteFull Time
Omen AI
Omen AI: Provides real-time fluid analysis to monitor critical infrastructure health.
Deep knowledge in applied physics, optical engineering, or physical chemistry; ECAD and MCAD proficiency (Altium and SolidWorks); prototype-driven, first-principles problem solving; spectroscopy experience preferred.
Altium, Solidworks
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2mo
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Robotics Hardware Engineer
Oakland, California, United States
$100k-$200k/yr OnsiteFull Time
Arxlight
Arxlight: Developing next-generation autonomous drones for security and defense applications.
BS/MS/PhD in Electrical/Mechanical/Mechatronics or Software Engineering; experience with electro-mechanical systems; prototype development; ability to read schematics; strong first-principles problem solving.
Solidworks, NX, Fusion 360, Altium, KiCad, Oscilloscopes, Power supplies, Multimeters, CAN, SPI, I2C, UART
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1mo
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Mechanical Engineer, Surgery & Robotics
Austin or South San Francisco
$83k-$224k/yr OnsiteFull Time
Neuralink
Neuralink: Developing implantable brain-computer interfaces to restore human capabilities.
3+ YOE3+ years mechanical engineering experience; strong first principles; BS in science or engineering or equivalent experience.
CAD, CAE, FEM, Matlab, Python
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5d
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New Product Introduction (NPI) Manufacturing Engineer
Santa Rosa, California, United States
$93k-$155k/yr OnsiteFull Time
Keysight Technologies
Keysight TechnologiesNYSE: KEYS: Provides electronic design, test, and simulation software and hardware.
Bachelor's/Masters/PhD in engineering, materials or sciences; ability to develop business and technical strategies; lead cross-functional teams; expertise in precision fabrication and manufacturing principles; familiarity with RF/microwave/mmWave; strong communication and organizational skills.
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1mo
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Assistant Engineer
Oakland, California, United States
$32-$42/hr OnsiteFull Time
Wood Rodgers
Wood Rodgers: Provides multidisciplinary engineering, planning, and surveying services for infrastructure.
0+ YOEBachelor's degree in civil engineering, 0–4 years experience, E.I.T. certification required or able to obtain within 6 months, proficiency with AutoCAD, Civil3D, and Microsoft Office, and knowledge of civil engineering principles.
AutoCAD, Civil3D, Microsoft Office Suite
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Founding Engineer: Agent Infrastructure
San Francisco, California, United States
OnsiteFull Time
Clera
Clera: AI talent agent matching professionals with high-growth startup roles
1+ YOE1+ years professional experience shipping to production; strong ownership, first-principles thinking, building production-grade infrastructure (APIs, LLM workflows, scraping, knowledge graphs), cloud and Linux experience.
LLM, Linux, APIs, knowledge graph
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18h
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Associate Electrical Engineer
Alameda, California, United States
$83k-$105k/yr OnsiteFull Time
Pyka
Pyka: Designs and manufactures autonomous electric aircraft for heavy-duty missions.
Bachelor's in Electrical Engineering or Robotics,0–2 years experience, hands-on PCB and lab experience, familiarity with motor control and safety principles, Linux and C/C++ skills.
Altium, KiCad, Eagle, Linux, C/C++, oscilloscope, power supply, multimeter
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1mo
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Entry-Level Engineer
Pleasanton or Sacramento or Millbrae or Sherman Oaks or Los Angeles or Irvine or Temecula or San Diego
$74k-$94k/yr OnsiteFull Time
The Whiting-Turner Contracting Company
The Whiting-Turner Contracting Company: Construction contractor providing engineering and construction services.
0+ YOEBachelor of Science in an engineering discipline; knowledge of engineering principles; ability to read technical specs and manage costs; proficient in MS Office; construction project experience.
Microsoft Project, Primavera, Suretrak, Microsoft Office Suite, Excel, Word
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3w
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Environmental Engineer 4
Concord, California, United States
$94k-$156k/yr HybridFull Time
CDM Smith
CDM Smith: Engineering and construction firm for global infrastructure projects.
5+ YOEBachelor's in engineering, EIT/FE within 18 months, 5+ years related experience, water/wastewater design experience preferred, knowledge of design principles, CADD, and Microsoft Office; travel up to 10%.
CADD, Microsoft Excel, Microsoft Word
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2d
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Staff Mechanical Engineer, Hydrogen System
Berkeley, California, United States
$129k-$169k/yr OnsiteFull Time
Form Energy
Form Energy: Developing multi-day batteries for grid-scale energy storage.
8+ YOEBachelor's in Mechanical Engineering and 8+ years mechanical design experience in fluid systems, prototyping, manufacturing, vendor engagement, safety, and first-principles fluids modeling.
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2mo
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Network Engineer Tier 3
El Segundo or Colorado Springs or Springfield or Offutt AFB or Denver or Australia or Las Cruces or Sacramento or Cape Canaveral or Pearl Harbor or John C. Stennis Space Center or Chantilly or Annapolis Junction or Kirtland AFB or Vandenberg Space Force Base or Wright Patterson AFB or Piti or San Antonio or United Kingdom
$105k-$231k/yr OnsiteFull Time
CACI International
CACI InternationalNYSE: CACI: Provides information technology and engineering services for government agencies.
10+ YOETS/SCI with polygraph required, 10+ years' network engineering experience, Bachelor's degree or equivalent, advanced knowledge of TCP/IP/OSPF/BGP/MPLS, experience with Cisco/Juniper, network monitoring, security principles, and leadership skills.
TCP/IP, OSPF, BGP, MPLS, Cisco, Juniper, ITIL
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3d
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Senior Site Reliability Engineer
San Francisco, California, United States
$149k-$224k/yr HybridFull Time
Salesforce
SalesforceNYSE: CRM: Sells cloud-based customer relationship management and business software solutions.
5+ YOE5+ years systems and software engineering experience for large-scale internet services; expertise in SRE principles, containers, observability, incident management, Python and Go, and applying AI/ML to operations.
Temporal, Airflow, Argo Workflows, Docker, Kubernetes, DNS, HTTP, Grafana, Prometheus, ELK, Splunk, Datadog, Python, Go, Linux, Claude Code, GitHub Copilot, Codex, Cursor, AWS, GCP, MCP
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1mo
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Industrial Engineer Manager - Job Detail | Careers Marketplace - Siemens
Sacramento, California, United States
$146k-$172k/yr OnsiteFull Time
Siemens
SiemensXETRA: SIE: Manufactures industrial automation, infrastructure, and energy technology systems.
5+ YOE2+ MgmtBachelor’s in Industrial/Manufacturing Engineering; 5+ years IE experience; leadership in engineering teams; lean principles; SAP proficiency.
SAP
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1w
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Strategy and Business Development Team Member
San Francisco or New York City or Denver or Austin or Calgary or Toronto or United States
$119k-$138k/yr RemoteFull Time
Intersect
IntersectNASDAQ: GOOGL: Develops-located data centers and renewable energy infrastructure.
Bachelor's in a quantitative field preferred; experience developing first-principles engineering/techno-economic models; proficiency in Python or similar; strong analytical and communication skills.
Python, Julia, MATLAB, R
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2mo
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Staff Product Designer
New York or San Francisco
$215k-$258k/yr HybridFull Time
GlossGenius
GlossGenius: All-in-one business management platform for beauty and wellness professionals.
7+ YOE7+ years in product design/UX/UI; experience with booking/scheduling/financial products; strong prototyping; AI-driven design experience.
Figma, Sketch, Framer, InVision, Principle
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