Principal AI/ML Engineer (Large Language Model) CACIPrincipal AI/ML Engineer (Large Language Model)Aurora, Colorado$114,600–$252,100 / yearJob Title: Principal AI/ML Engineer (Large Language Model)Job Category: ScienceTime Type: Full timeMinimum Clearance Required to Start: TS/SCIEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: LocalAnticipated Posting End: 12/2/2026 The Opportunity: The Principal AI/ML Engineer will support the development of AI/ML algorithms in a multitude of disciplines from object detection/classification, natural language processing, reinforcement learning, and large language models. Experience leading an interdisciplinary team of researchers and software developers and working with a program manager to define project scope and schedule to ensure we meet project milestones as defined by our customers.
TS/SCI - Principal Software Engineer Associates SystemsTS/SCI - Principal Software EngineerAurora, ColoradoThe engineer will work across the full software development lifecycle, troubleshoot system anomalies, coordinate software upgrades, and develop technical solutions for complex software, configuration, network, and operating system issues. Seeking a Principal Software Engineer to support the enhancement, modification, troubleshooting, and sustainment of existing software systems.
Principal Engineer, Rendezvous & Proximity Operations (Rpo), Guidance, Navigation & Control, Lead Sierra SpacePrincipal Engineer, Rendezvous & Proximity Operations (Rpo), Guidance, Navigation & Control, LeadCentennial, CO$184,628–$253,884.50 / yearLead end-to-end efforts in Rendezvous, Proximity Operations (RPO), and docking activities, including mission planning, trajectory optimization, system integration, and operational execution to ensure precise and reliable spacecraft interactions. You will also perform sensor and actuator selection and sizing based on program requirements, using and developing relevant design tools, and assist in AI&T by conducting HITL unit and integrated testing to verify GNC subsystem performance.
Sr. Principal Algorithms Software Engineer - Boulder, Colorado Davidson Technologies, Inc.Sr. Principal Algorithms Software Engineer - Boulder, ColoradoBoulder, COFull timeJob Requirements:Principal Algorithm Software Engineer (Level 3): Bachelor's Degree in a STEM (Science, Technology, Engineering or Mathematics) discipline preferred from an accredited university and 5 years of related experience, or a Master's degree in a STEM discipline and 3 years experience, or a PhD and 1 year of experience. Principal Algorithm Software Engineer (Level 4): Bachelor's Degree in a STEM (Science, Technology, Engineering or Mathematics) discipline preferred from an accredited university and 8 years of related experience, or a Master's degree in a STEM discipline and 6 years experience, or a PhD and 4 year of experience.
Principal Test Development Engineer Avenue Technologies CompanyPrincipal Test Development EngineerAurora, ColoradoAvenue Technologies is seeking a Principal Test Development Engineer to support technical, engineering, and program teams in a hands-on environment. Collaborate with multidisciplinary engineering teams to verify product performance and resolve technical issues.
Sr. Principal Pipeline Engineer (TS/SCI Clearance) MKS2 TechnologiesSr. Principal Pipeline Engineer (TS/SCI Clearance)Denver, CO$200,000–$225,000 / yearMKS2 Technologies, LLC, an award-winning high growth small business, creates innovative and customer-centric technology solutions in the areas of Cyber Security, Instructional Design and Training, Software Engineering and IT Support Services to improve the security and well-being of our clients. Principal Pipeline Engineer will architect, develop, automate, and maintain core pipeline services using tools such as AWS, RHEL, Ansible, Artifactory, Jenkins, GitLab, and Terraform to support our Infrastructure as Code (IaC) and secure software supply chain objectives.
Principal Mechanical Engineer - Product Development FormFactorPrincipal Mechanical Engineer - Product DevelopmentBoulder, ColoradoCollaboration, Communication, Cryogenic Engineering, Detail-Oriented, Engineering Change Order (ECO), Heat Transfers, Manufacturing Processes, Materials Properties, Mechanical Design, Scientific Instruments, Semiconductor Industry, System Modeling, Technical Problem-Solving, Thermodynamics, Tolerance Analysis, Validation Testing Education & Experience: The ideal candidate brings at least five years of related engineering experience in complex mechanical or electro-mechanical product development, with cryogenic or semiconductor equipment experience preferred, and demonstrates strong communication, collaboration, prioritization, and data-driven decision-making skills.
Principal RF Test Engineer I CesiumAstroPrincipal RF Test Engineer IWestminster, CO$158,000–$189,000 / yearCore day-to-day responsibilities include collaborating with design and test engineering teams to develop test requirements, mapping requirements to reusable test architectures and procedures, implementing test plans and procedures, and logging and presenting results to key stakeholders. Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.
Principal RF Test Engineer II CesiumAstroPrincipal RF Test Engineer IIWestminster, CO$158,000–$200,000 / yearCore day-to-day responsibilities include collaborating with design and test engineering teams to develop test requirements, mapping requirements to reusable test architectures and procedures, implementing test plans and procedures, and logging and presenting results to key stakeholders. Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.
Electrical Engineer (Senior - Principal), Harness True AnomalyElectrical Engineer (Senior - Principal), HarnessDenver, CO$135,000–$275,000 / yearExcellent written and verbal communication skills, including experience shaping cross-org alignment and maintaining composure and clarity under program pressure and influencing executive leadership on technical strategy, investment priorities, and organizational direction. Embed True Anomaly's values into cross-org delivery practices; serve as a visible role model for trust, accountability, and principled engineering judgment while setting the cultural tone for how teams collaborate and hold themselves accountable.
NewMajor Project Civil Engineer (Staff, Senior, or Principal) Xcel EnergyMajor Project Civil Engineer (Staff, Senior, or Principal)Denver, ColoradoAs a leading combination electricity and natural gas energy company, Xcel Energy offers a comprehensive portfolio of energy-related products and services to 3.4 million electricity and 1.9 million natural gas customers across eight Western and Midwestern states. Coordinate/leads critical projects or portions of projects (including phases such as research, design, equipment selection, procurement support, installation & commissioning), under the direction of a higher level engineer or supervisor.
Senior Principal Facility Engineer BPSenior Principal Facility EngineerDenver, ColoradoThe following specific technical experience is desirable: gas processing/treating, gas compression equipment, pressure swing adsorption, flares and thermal oxidizers. They will also work closely with in-house Engineering teams and 3rd party Engineering Contractors to develop workpack deliverables for plant modifications.
Principal Robotics Hardware Engineer Prime RoboticsPrincipal Robotics Hardware EngineerDenver, CO$160,000–$220,000You will personally inspect robots, diagnose failures, test solutions, review designs, and work with our China engineering team to implement permanent improvements. Diagnose intermittent and system-level problems involving power, grounding, EMI/EMC, sensors, motor controllers, embedded computers, wiring, and communications.
Principal Engineer, Embedded, Sensors, And Safety Software OutriderPrincipal Engineer, Embedded, Sensors, And Safety SoftwareHenderson, CO$165,000–$190,000 / yearSuccessful candidates have a demonstrated technical track record in designing and implementing robust Software Test Infrastructure for complex hardware-based systems, bringing an exceptional system-level perspective and proficiency in software. The ideal candidate will embrace our goal to drive zero-emission, self-driving vehicle adoption, and help us realize our potential to define, build, and lead a new category of robotic automation for the enterprise.
Principal Engineer, Embedded, Sensors, and Safety Software OutriderPrincipal Engineer, Embedded, Sensors, and Safety SoftwareHenderson, CO$165,000–$190,000 / yearSuccessful candidates have a demonstrated technical track record in designing and implementing robust Software Test Infrastructure for complex hardware-based systems, bringing an exceptional system-level perspective and proficiency in software. The ideal candidate will embrace our goal to drive zero-emission, self-driving vehicle adoption, and help us realize our potential to define, build, and lead a new category of robotic automation for the enterprise.
Principal Fluids Engineer Blue OriginPrincipal Fluids EngineerDenver, Washingtonand/or transports placardable amounts of hazardous materials by ground in any vehicle on a public road while in commerce, may be subject to additional Federal Motor Carrier Safety Regulations including: Driver Qualification Files, Medical Certification (obtained before onboarding), Road Test, Hours of Service, Drug and Alcohol Testing (CDL drivers only), vehicle inspection requirements, CDL requirements (if applicable) and hazardous materials transportation/shipping training. Required for Certain Job Profiles: Drivers who operate Commercial Motor Vehicles with a Gross Vehicle Weight (GVW), Gross Vehicle Weight Rating (GVWR) or combination of power unit and trailer that meets or exceeds 10,001 lbs.
Principal Thermal Engineer Blue OriginPrincipal Thermal EngineerDenver, Washingtonand/or transports placardable amounts of hazardous materials by ground in any vehicle on a public road while in commerce, may be subject to additional Federal Motor Carrier Safety Regulations including: Driver Qualification Files, Medical Certification (obtained before onboarding), Road Test, Hours of Service, Drug and Alcohol Testing, vehicle inspection requirements, CDL requirements (if applicable) and hazardous materials transportation/shipping training. Required for Certain Job Profiles: Drivers who operate Commercial Motor Vehicles with a Gross Vehicle Weight (GVW), Gross Vehicle Weight Rating (GVWR) or combination of power unit and trailer that meets or exceeds 10,001 lbs.
Principal RF Design Engineer, Antennas QorvoPrincipal RF Design Engineer, AntennasDenver, CO$143,800–$186,900 / yearA candidate in this position will be trained and expected to perform the following duties shortly after joining the antenna team: Collaborate with a multi-disciplinary team including mmWave antenna, electrical, RF component, and printed circuit board design engineers developing mmWave phased array prototype designs for emerging markets and applications. A candidate in this position will be trained and expected to perform the following duties 1-2 years after joining the antenna team: Develop, maintain, and update cascaded system design tools to track linear and nonlinear RF, IF, and DC performance of mmWave phased array antenna prototypes using Qorvo IC's (formerly Anokiwave).
NewPrincipal Antenna Design Engineer QorvoPrincipal Antenna Design EngineerDenver, CO$148,100–$192,500 / yearA candidate in this position will be trained and expected to perform the following duties 1-2 years after joining the antenna team: Develop, maintain, and update cascaded system design tools to track linear and nonlinear RF, IF, and DC performance of mmWave phased array antenna prototypes using Qorvo ICs. A candidate in this position will be trained and expected to perform the following duties shortly after joining the antenna team: Design PCB-based antenna elements and arrays for mmWave operation, including analysis of array-level efficiency, gain, scan performance, and related metrics.
Principal Engineer Procare SolutionsPrincipal EngineerDenver, Colorado$180,000–$200,000 / yearWe recognize the responsibility that comes with nurturing and educating children, which is why our child care management solutions are designed to automate business processes, help ensure safety and compliance, communicate with families and provide educational resources and training to help teachers and children thrive. For over 30 years, Procare Solutions has been dedicated to empowering early childhood educators by providing products and services that enable them to focus on the care, safety and education of children.