Top Principal Engineer Jobs in Los Angeles, CA

Serve as a global SME for Industrial Metaverse technologies (PLCs, IoT, cloud/edge, digital twins, AI, EMC/RED, cybersecurity). Lead standards work, develop test programs, perform and supervise complex testing, train staff, represent UL externally, and support clients and continuous improvement across regional or global labs.

Lead the engineering architecture for an AI-driven product, focusing on system design, collaborating with AI agents, and ensuring quality and scalability in large-scale SaaS environments.

Lead design and verification of high-performance ASICs/SoCs and multi-FPGA systems. Drive architecture, HDL implementation, verification (SystemVerilog/UVM), timing closure, hardware integration, and FPGA prototyping. Mentor teams, coordinate with systems/customers, and ensure delivery of production designs meeting program requirements.

Design and scale critical, highly-available services; set technical direction across teams; apply best practices for availability, scalability, cost, and operational excellence; leverage AI tools and high-velocity workflows; mentor engineers and solve ambiguous, company-wide technical problems.

Lead technical authority for spacecraft EMI/EMC: set system- and unit-level EMC requirements, define grounding/bonding/shielding/filtering architectures, drive MIL-STD-461 and GSFC-7000 qualification, perform pre-compliance analysis, diagnose EMI issues, develop test capability and procedures, and establish EMI/EMC standards and mentorship across programs through production and launch.

Lead structural architect for a reusable reentry vehicle: own primary/secondary structures, perform hand calculations and FEA, create GD&T manufacturing drawings, lead build/test campaigns, work with vendors, and mentor junior engineers.

Lead the design and implementation of thermal protection systems for reentry vehicles, ensuring robust performance and managing testing and materials qualification.

The role involves architecting spacecraft-wide harness solutions, establishing standards and automation tools, overseeing manufacturing strategies, and mentoring engineers across teams.

Design and develop Mechanical Ground Support Equipment (MGSE) for spacecraft integration and test. Create 3D CAD models and 2D drawings, apply ASME Y14.5 GD&T, perform first-order structural analysis, support fabrication and acceptance testing, develop PDR/CDR materials, define requirements, and provide integration/test support in a clean-room, on-site role requiring an active Top Secret clearance.

Design and develop Mechanical Ground Support Equipment (MGSE) for spacecraft integration and test. Responsibilities include 3D CAD modeling, GD&T drafting, first-order structural analysis, fabrication/vendor support, requirements definition, design reviews (PDR/CDR), producing drawings and work instructions, resolving non-conformances, and supporting integration and test operations.

Design, model, test, and analyze component- and system-level survivability (RF/IR/visual/acoustic). Plan and execute RCS/RF tests, integrate survivability technologies, coordinate with designers and suppliers, perform data analysis and provide recommendations, and support material/process development and mission system integration. Role may include liaison engineering and up to 50% travel.

Lead design, integration, test, and certification of avionics systems for out-of-production fleets. Perform requirements decomposition, verification/validation, supplier management, system integration (lab/ground/flight), safety analyses (FHA, FMEA, fault tree), and provide cross-functional technical leadership and supplier coordination.

The Principal Software Engineer will design and implement systems for the advertiser experiences at Snap, lead technical vision, mentor engineers, and innovate on creator marketplace products.

Design, develop, and test digital flight and ground electronics including FPGA development, PCB/CCA design, electronic unit and test system design, functional simulation, test vector creation, and worst-case digital signal analysis. Lead design reviews and integrate with cross-functional teams to meet program technical and schedule requirements.

Design, model, test, and analyze component- and system-level survivability across RF, IR, VIS, and acoustic spectrums. Plan and execute RCS/RF tests, develop materials/processes, integrate mission systems, coordinate with designers and suppliers, and deliver test analyses and recommendations to reduce system detectability.

Design, analyze, simulate, and test high-reliability analog and power electronics. Perform circuit design and control/feedback analysis, hardware validation, and manufacturing test support. Position may be filled at Principal or Senior Principal levels depending on experience; requires ability to obtain SSBI/SCI clearance.

Lead systems architect for Command and Control Enclave (C2E) delivering tailored architectural solutions, trade studies, and integration approaches. Define hardware, software, networking, and support architectures, validate requirements, analyze performance and interfaces, and produce technical documentation and design reviews to meet contract deliverables while applying rigorous engineering processes.

Develop and integrate survivability and low-observable technologies for aircraft, perform RCS analysis, build predictive analysis codes and physical models, design and test materials and verification equipment, and collaborate with multidisciplinary teams to integrate technologies into air-based systems. On-site role with ~25% travel and requires U.S. government security clearance.

Lead architecture, build, and operate customer-facing analytics platform: design ELT and metric governance, implement low-latency serving (OLAP), ensure reliability/performance, mentor engineers, partner with product, and use AI coding tools to accelerate development.

The Principal Component Engineer will support space programs by defining requirements for EEE parts, conducting tests, qualifying suppliers, and developing production systems.

Design and build next-generation ads formats, backend infrastructure, and scalable distributed systems. Lead technical direction, collaborate across teams to define product requirements, experiment, analyze and optimize ad performance, and ensure availability, scalability, operational excellence, and cost management. Mentor engineers and apply AI tools and high-velocity workflows to deliver production-ready systems.

Develop, implement, and verify guidance, navigation, and control (GNC) algorithms and simulations for manned and unmanned fixed-wing air vehicles. Create control laws, build linear and non-linear dynamic models, run hardware-in-the-loop and flight-test analysis, and support design reviews and autonomy logic for inner/outer loop control and autopilot functions.

Adapt mobile control station applications to a cloud environment, build Infrastructure-as-Code and deployment pipelines for an IL-5 cloud, containerize services, integrate instrumentation and security, and perform system testing. Collaborate with software, systems, cloud, and DevOps teams in an Agile environment. Role may be filled at Engineer or Principal Engineer level depending on experience.

Adapt mobile control station applications to a cloud environment, build Infrastructure-as-Code and containerized deployments (Docker/Kubernetes), implement networking/security, instrumentation and integration, and support system testing in an Agile, multidisciplinary team. Work includes cloud adoption, environment prototyping, and DevOps toolchain integration.

Lead EMI/EMC systems design and testing from component to system level. Develop models, perform emissions and susceptibility testing, design test fixtures and apparatus, analyze data, prepare qualification procedures/reports, and support mitigation/troubleshooting. Coordinate testing, occasional travel, and off-shift work as needed.