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40 principle developer jobs at 26 companies in Simi Valley, CA

3w
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Principle Mechanical Engineer
Playa Vista or Santa Monica or Los Angeles
$210k-$235k/yr OnsiteFull Time
Outpost Space
Outpost Space: Building reusable spacecraft for precision Earth return and logistics.
8+ YOEBachelor's in Mechanical/Aerospace/Structural Engineering, 8+ years designing and analyzing full space vehicles, expert-level CAD and FEA experience, materials and manufacturing fluency, and mentorship experience.
ANSYS, FEMAP, NASTRAN, Siemens NX, SolidWorks, Python, MATLAB, CNC
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1w
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Program Chief Engineer (Principle or Senior)
El Segundo, California, United States
$177k-$285k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures commercial airplanes, defense systems, and space technology.
10+ YOEBachelor's in engineering (or equivalent),10+ years space-systems engineering experience, program startup and baselining, risk and issue management, supplier management, RCCA, customer engagement, and leadership of multidisciplinary teams; must be a U.S. Person.
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Principal Engineer Circuit Design /Senior Principle Engineer Circuit Design
Manhattan Beach or Redondo Beach
$114k-$171k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Designs and manufactures advanced aerospace and defense systems.
5+ YOEBachelor's in STEM plus 5+ yrs (Principal) or 8+ yrs (Senior) engineering experience; analog/power circuit design; PSpice/Simplis/Simetrix/LTSpice and MathCAD proficiency; control systems knowledge; ability to obtain Top Secret/SSBI/SCI clearance.
PSpice, Simplis, Simetrix, LTSpice, MathCAD, Earned Value Management Systems
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Principal Engineer Circuit Design /Senior Principle Engineer Circuit Design
Manhattan Beach or Redondo Beach
$114k-$171k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Develops and manufactures advanced aerospace, defense, and space systems.
5+ YOEBachelor's degree in STEM with 5+ years (or advanced degree with fewer years), experience designing and testing analog and power circuits, proficiency with PSpice/Simplis/Simetrix/LTSpice and MathCAD, knowledge of control systems, and ability to obtain Top Secret/SCI clearance.
PSpice, Simplis, Simetrix, LTSpice, MathCAD, Earned Value Management Systems
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Front-End/UI Engineer – Egofold (Junior to Mid-Level)
Culver City, California, United States
$100k-$150k/yr HybridFull Time
Snail Games
Snail GamesNasdaq: SNAL: Develops and publishes interactive video game entertainment.
Proficiency with modern front-end frameworks (React, Vue), JavaScript/TypeScript, frontend architecture, UX principles, and experience with real-time or interactive systems.
React, Vue, JavaScript, TypeScript
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6d
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SATCOM System Integration and Test Systems Engineering SME - Principle
El Segundo, California, United States
$151k-$301k/yr OnsiteFull Time
Lockheed Martin
Lockheed MartinNYSE: LMT: Designs and manufactures global security and aerospace systems.
10+ YOEBachelor's in engineering or equivalent,10+ years systems engineering experience with SATCOM and systems integration and test, RF/digital communications exposure, active Secret clearance and US citizenship required.
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Mechanical Engineer
Hawthorne, California, United States
$90k-$140k/yr OnsiteFull Time
Freeform
Freeform: Deploys autonomous AI-powered metal 3D printing factories.
2+ YOEBachelor's in mechanical or aerospace engineering; 2+ years in full lifecycle mechanical design; strong first-principles problem solving.
NX, CAD, 3D printing, FEM, manufacturing
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Sr Engineer
Thousand Oaks, California, United States
$115k-$156k/yr OnsiteFull Time
Amgen
AmgenNASDAQ: AMGN: Develops and manufactures biotechnology medicines for serious diseases.
Provide technical leadership for parenteral drug product process design, characterization, tech transfer and pilot-plant operations; apply scientific and engineering principles; support GMP manufacturing and cross-functional teams.
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2d
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Senior Systems Engineer
Torrance, California, United States
$135k-$185k/yr OnsiteFull Time
Valar Atomics
Valar Atomics: Developing scalable, high-temperature, grid-independent advanced nuclear power systems.
4+ YOEBachelor's in engineering, 4+ years systems engineering, strong systems engineering principles, multidisciplinary experience, EMR not mentioned, analytical and communication skills.
IBM Rhapsody 10.0 (SysML 1.x), DOORS, Jama, SysML, UML, Claude
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1mo
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HWS Engineer
Port Hueneme, California, United States
OnsiteContract
Engineering Services Network
Engineering Services Network: Defense contractor delivering engineering and technical services.
3+ YOE3-5 years engineering experience; BS in Engineering; strong engineering principles; system design experience; software/tool proficiency; problem-solving; teamwork; ability to manage multiple projects.
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Sr Quality Engineer (Aerospace)
Torrance, California, United States
$95k-$117k/yr OnsiteFull Time
Howmet Aerospace
Howmet AerospaceNYSE: HWM: Manufactures high-performance metal components for aerospace and transportation.
6+ YOEBachelor's in STEM, minimum 6 years quality experience in production/manufacturing, US work authorization required, experience with root cause analysis and quality engineering principles.
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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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1mo
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Staff Vehicle Engineer
Playa Vista, California, United States
$161k-$221k/yr OnsiteFull Time
Inversion Space
Inversion Space: Building autonomous re-entry vehicles for global space-to-Earth cargo delivery.
8+ YOEBachelor's in relevant engineering or equivalent experience, typically 8+ years in aerospace vehicle design and integration; proficiency in CAD; strong first-principles background across structures, thermal, avionics, GNC; excellent communication.
CAD
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1mo
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New Grad Civil Engineer I
Los Angeles, California, United States
$76k-$115k/yr OnsiteFull Time
HNTB
HNTB: Infrastructure design and engineering for transportation and public works
Bachelor's degree in Engineering required. Familiarity with engineering principles, Microsoft Office, MicroStation and/or AutoCAD. EIT certification and civil engineering internship experience preferred.
Microsoft Office Suite, MicroStation, AutoCAD
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3mo
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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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3mo
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Senior EMI/EMC Test Engineer
Los Angeles, California, United States
$140k-$190k/yr OnsiteFull Time
K2 Space
K2 Space: Develops high-power satellite platforms for heavy-lift launch vehicles.
4+ YOEBachelor’s in Electrical Engineering or related field; 4+ years EMI/EMC experience; strong EMI principles; project management skills.
Python, Altium Designer, PCB design, EMC testing tools, MIL-STD-461
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1w
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Senior Opto-Mechanical Engineer
Long Beach, California, United States
$142k-$214k/yr OnsiteFull Time
Relativity Space
Relativity Space: Designing and manufacturing 3D-printed rockets and launch vehicles.
5+ YOEBachelor's in Mechanical/Optical Engineering, 5+ years opto-mechanical experience, CAD and FEA proficiency, experience designing for thermal, vibration, and gravity effects, strong opto-mechanical principles and communication skills.
CAD, FEA
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Senior Reactor Systems Engineer
El Segundo, California, United States
$134k-$185k/yr OnsiteFull Time
Radiant
Radiant: Designs and manufactures portable, mass-produced nuclear microreactors.
4+ YOE4+ years engineering experience, expertise in hardware/software testing and operations, first-principles problem solving, background in regulated industries, ability to translate designs into DOE/NRC-compliant procedures, willing to work extended hours and travel 50–60%.
Python, UNIX
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2w
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Principal Engineer, Digital Workplace Technology Engineering
New York or New Jersey or Los Angeles or United States
$180k-$210k/yr RemoteFull Time
NBCUniversal
NBCUniversalNASDAQ: CMCSA: Produces and distributes entertainment content and theme park experiences.
12+ YOE12+ years in enterprise/platform engineering; deep expertise in Microsoft 365, endpoint management (Intune, JAMF, SCCM), Azure, enterprise AI (Copilot, Power Platform), architecture, SRE principles, and large-scale platform transformations.
Microsoft 365, Microsoft Teams, Microsoft SharePoint, Microsoft OneDrive, Microsoft Exchange Online, Microsoft Entra ID, Microsoft Purview, Microsoft Defender, Microsoft Intune, JAMF, Microsoft SCCM, Microsoft Copilot, Copilot Studio, Microsoft Power Platform, Microsoft Power Apps, Microsoft Power Automate, Microsoft Azure, MLOps, DevOps
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Manufacturing Engineer - Structures & Propulsion - 2nd Shift - Millennium Space Systems
El Segundo, California, United States
$91k-$164k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
2+ YOE2+ years mechanical/manufacturing engineering experience in aerospace/automotive/commercial industries; ability to obtain U.S. security clearance and U.S. Person status; experience reading mechanical drawings and applying production engineering principles; CAD/GD&T knowledge preferred.
CAD Software, GD&T, ASME Y14.5
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