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Principal Engineer United States Jobs (On-site work)

396 Job Offers

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Principal Mechanical Engineer
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Lead mechanical architecture for autonomous directed-energy counter-drone systems in San Francisco. Requires 10+ years shipping complex hardware from prototype to production, strong CAD and FEA skills, and cross-disciplinary expertise. Salary $235K-$305K.
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Clera
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Principal Turbomachinery Engineer
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Radiant seeks a Principal Turbomachinery Engineer in El Segundo to lead high-speed rotating machinery design for transportable nuclear microreactors. Requires 10+ years, ANSYS/NX expertise, and full hardware ownership.
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Radiant Industries
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Principal Robotics Engineer - R&D
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Boston Engineering seeks a Principal Robotics Engineer in Waltham, MA to lead R&D for advanced robotic systems. Requires 10+ years engineering experience, 5+ in robotics, and hands-on integration expertise.
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Boston Engineering Corporation
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Principal Robotics Software Engineer
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Lead production robotics software for autonomous defense systems in San Francisco. Requires 10+ years of hands-on C++ and ROS/ROS2 experience shipping field-ready systems. On-site role, $235k-$305k.
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Clera
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Principal PIC (Photonic Integrated Circuit) Design Engineer
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Lead silicon photonic IC design at Voyant Photonics in NYC, driving chip-scale LiDAR and optical circuit switches for AI data centers. Requires PhD, 7+ years PIC design experience, and full tapeout ownership.
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Voyant Photonics
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Sr Principal Software Development Engineer
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Lead software architecture and technical strategy for advanced semiconductor test platforms at FormFactor in Beaverton. Requires C#/.NET expertise, large-scale systems design, and cross-team technical leadership.
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115800.00 - 151935.00 USD / Year
Formfactor
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Principal Facilities Engineer
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Hims & Hers seeks a Principal Facilities Engineer in Mesa to lead GMP facility systems across HVAC, electrical, and purified water. Requires 8-10 years facilities engineering experience and deep cGMP knowledge.
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Hims & Hers
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Principal Facilities Engineer
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Hims & Hers seeks a Principal Facilities Engineer in New Albany to lead GMP facility systems (HVAC, EMS, BMS) on the Wed-Sun shift. Requires 8-10 years facilities engineering experience and cGMP expertise. Competitive salary, equity, and unlimited PTO.
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Hims & Hers
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Principal Product Cybersecurity Assurance Engineer
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Lead product cybersecurity assurance for Humanoid's HMND 01 robots in Cambridge, US. Requires ISO 27001/NIST RMF expertise, IEC 62443 knowledge, and TARA skills. Competitive salary, equity, and full benefits.
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Humanoid
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Principal Software Engineer
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Lead crypto trading platform innovation as a Principal Software Engineer in Jersey City. Requires 10+ years in software engineering, Java zero GC expertise, and low-latency systems design. Competitive benefits included.
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107000.00 - 216000.00 USD / Year
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Fidelity Investments
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Principal Design Engineer, Analog Mixed-Signal (AMS)
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Lead the end-to-end architecture of a custom AMS ASIC for an implantable neural interface in Alameda, CA. Requires 10+ years of AMS IC design, multiple tapeouts, and low-noise ultra-low-power expertise.
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Epia Neuro
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Principal Engineer, Electrical (R5909)
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Shield AI seeks a Principal Electrical Engineer in San Diego to own flight-critical avionics and circuit design for V-BAT aircraft. Requires 10+ years of EE experience, full-cycle hardware development, and strong mentorship skills.
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210000.00 - 310000.00 USD / Year
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Shield AI
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Principal Engineer, SSD Systems Design
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Lead SSD system design and architecture at Micron in Longmont, CO. Requires 6+ years in SSD development, deep PCIe/NVMe expertise, and strong cross-functional leadership. Shape next-gen storage solutions.
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United States, Longmont-MAX- Office
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Micron
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Principal Manufacturing Process Engineer
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FormFactor seeks a Principal Manufacturing Process Engineer in Farmers Branch, TX to optimize photolithography and etch processes in high-volume semiconductor manufacturing. Requires 5+ years experience with SPC, DOE, and CAPA expertise.
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Formfactor
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Principal Automation Engineer
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Lead Site Reliability Engineering for NYC's automation platforms as Principal Automation Engineer in Brooklyn. Oversee CI/CD pipelines, IaC, and incident response while mentoring DevOps engineers. Master's or bachelor's plus 3-4 years IT experience required.
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City of New York
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Principal Systems Engineer, Signal-Path Performance & Modeling
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Lead signal-path architecture for silicon photonics at Neurophos in Austin. Requires MS/PhD, 7+ years in communication systems, link-budget modeling, and DSP expertise. Top benefits and equity.
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Neurophos
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Principal Software Engineer
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UiPath seeks a Principal Software Engineer in Bellevue to architect large-scale cloud services and AI-native systems. Requires 10+ years building commercial applications, distributed systems expertise, and a founder mindset.
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UiPath
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Principal Thermal Engineer - Aircraft Avionics & Thermal Systems (R3930)
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Lead thermal architecture for UAV avionics at Shield AI in Seattle. Requires 12+ years in electronics thermal engineering, CFD expertise (FloEFD, Icepak), and strong heat transfer fundamentals. Shape next-gen AI aircraft systems.
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250000.00 - 350000.00 USD / Year
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Shield AI
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Principal Mechanical Engineer / Systems Engineer
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Lead mechanical architecture for HaloBraid, a first-of-its-kind robotic braiding device in Cambridge, MA. Requires 10+ years in electromechanical product development, CAD review, DFM/DFA, and pilot-to-production delivery. Equity, full benefits, unlimited PTO.
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HaloBraid
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Principal ASIC Engineer (Mixed-Signal)
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Voyant Photonics seeks a Principal Mixed-Signal ASIC Engineer in NYC to lead its custom IC program. Requires 7+ years analog/mixed-signal design, TIA expertise, and multiple tapeouts. Ground-floor role delivering silicon in 9-12 months.
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Voyant Photonics
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About the Principal Engineer role

Explore the pinnacle of technical leadership with Principal Engineer jobs. A Principal Engineer is a master-level technical expert and strategic leader within an engineering organization. This is not merely a senior role; it represents the apex of an individual contributor technical track, where influence, architectural vision, and deep expertise converge to shape the technological future of a company. Professionals in these roles are the go-to authorities for the most complex, high-impact challenges, setting technical standards and driving innovation across multiple teams or the entire organization.

The common responsibilities of a Principal Engineer are vast and critical to long-term success. Typically, they involve defining and driving the long-term technical strategy and architectural vision for major platforms or product suites. They are responsible for researching, prototyping, and selecting technologies that will scale to meet future business needs. A core part of their duties includes leading the design and implementation of complex, cross-functional systems, ensuring they are resilient, secure, and efficient. They serve as the ultimate escalation point for critical production issues, conducting deep-dive analysis and root cause investigations to resolve systemic problems. Furthermore, Principal Engineers have a significant mentorship and governance function, actively coaching senior and staff engineers, establishing best practices, and conducting rigorous code and design reviews to maintain exceptional quality across all engineering outputs. They are also key collaborators, working closely with engineering managers, product leaders, and enterprise architects to align technical execution with business objectives.

The typical skills and requirements for these high-level positions are extensive. A bachelor's or master's degree in computer science, engineering, or a related field is common, though equivalent demonstrable experience is often acceptable. Most roles require a minimum of 10+ years of progressive, hands-on software development or infrastructure engineering experience, with a significant portion spent in lead or architecture-focused positions. Essential technical skills include mastery of relevant programming languages and frameworks, profound knowledge of system design patterns and distributed architectures, and expertise in cloud platforms like AWS, Azure, or GCP. They must possess exceptional analytical and problem-solving abilities to deconstruct ambiguous, complex problems. Beyond technical prowess, superior soft skills are non-negotiable; this includes outstanding communication to articulate technical vision to both technical and non-technical stakeholders, proven leadership and influence without formal authority, and strategic business acumen. For those seeking to define technological frontiers and mentor the next generation of experts, Principal Engineer jobs offer a challenging and highly rewarding career path at the forefront of innovation.