Principal Combustion Engineer Reworld Holding CorpPrincipal Combustion EngineerPARemote$91,200–$121,400 / yearThis role provides expert-level technical support to operating facilities, with a focus on identifying true performance drivers, stabilizing combustion, improving throughput and availability, and supporting investigations related to environmental exceedances. All Reworld positions require a candidate's ability to perform the duties and responsibilities of the role while upholding Reworld's Values, including (but not limited to) contributing to a safe and inclusive workplace, delivering results through trust, and building breakthrough capabilities.
Remote Principal Full Stack Software Engineer Butterfly Network IncRemote Principal Full Stack Software EngineerPARemoteIn addition to its medical imaging products, Butterfly Embedded is the Company's Ultrasound-on-Chip licensing and co-development program designed to enable a new wave of ultrasound-enabled technologies across non-competitive healthcare markets and beyond. In doing so, we manage and maintain our customers' administration of users and organizations, ensuring feature and entitlement management, as well as building scalable, platform-level enterprise features such as global search and audit logging.
Principal Financial Implementation Consultant (Healthcare) Workday IncPrincipal Financial Implementation Consultant (Healthcare)PA$140,300–$210,500 / yearWe know that flexibility can take shape in many ways, so rather than a number of required days in-office each week, we simply spend at least half (50%) of our time each quarter in the office or in the field with our customers, prospects, and partners (depending on role). As an experienced financial functional consultant, you will play a key role in ensuring the successful implementation of Workday's financial solutions for our healthcare customers and guiding them through transforming their financial operations.
Principal Research Scientist Educational Testing ServicePrincipal Research ScientistPrinceton, NJParticular areas of interest include (1) understanding and measuring the skills and capabilities that drive success in education and labor markets, including how advances in AI are reshaping skill demand, workforce readiness, and pathways to opportunity, and (2) generating evidence on the effectiveness of educational and workforce development pathways, including competency-based education (CBE), career and technical education (CTE), and other approaches designed to promote skill acquisition, employment, earnings growth, and long-term economic mobility. For appointment at the Principal Scientist level, substantial (typically 10+ years) postdoctoral or professional research experience relevant to human capital development, workforce readiness, workforce pathways, labor market outcomes, educational and workforce assessment, CBE/CTE, or skills measurement, including demonstrated record of research leadership, external funding, and partnership development.
Education And Science Principal HDR, Inc.Education And Science PrincipalPennington, NJOur eight Employee Network Groups (Asian Pacific, Black, Hispanic/Latino(a), LGBTQ, People with Disabilities, Veterans, Women, Young Professionals) help create a sense of belonging and foster a supportive environment where everyone is empowered to engage and contribute. At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day.
Electrical Principal HDR, Inc.Electrical PrincipalPennington, NJOur eight Employee Network Groups (Asian Pacific, Black, Hispanic/Latino(a), LGBTQ, People with Disabilities, Veterans, Women, Young Professionals) help create a sense of belonging and foster a supportive environment where everyone is empowered to engage and contribute. At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day.
NewHuman Resources Principal - Blackwell HR Blackwell HRHuman Resources Principal - Blackwell HRWilmington, DERemote$80,000–$110,000 / yearWith a focus on small to medium-sized businesses and nonprofits, our team of experienced HR professionals partner with clients across a variety of industries and business communities to develop and implement HR and solutions that allow business leaders to focus on achieving their mission and fully engage their teams. Deliver exceptional client service by communicating clearly, managing competing priorities, and working collaboratively with both clients and the Blackwell HR team.
NewPrincipal AI/ML Engineer (Large Language Model) (TS/SCI) {S} ARKA Group, L.P.Principal AI/ML Engineer (Large Language Model) (TS/SCI) {S}King Of Prussia, PennsylvaniaExperience 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. Situated less than an hour outside of Philadelphia and hosting the largest mall on the east coast, King of Prussia offers the urban feel sought in the city, while also giving opportunities to experience the beauty and history found only in Pennsylvania.
Principal Software Engineer (TS/SCI) {S} ARKA Group, L.P.Principal Software Engineer (TS/SCI) {S}King Of Prussia, PennsylvaniaBeyond direct design, the architect is expected to drive technical consensus through trade studies, proactively identify and mitigate technical risks, act as the primary technical interface to leadership, government customers, and sub-contractor CA/CE’s, and actively participate in the mentorship and growth of the distributed engineering team, ultimately joining our team to help shape the development and delivery of custom solutions and providing significant opportunities for personal skill development at ARKA. ARKA is seeking an accomplished Software Architect/Principal Software Engineer who is deeply customer mission-focused and passionate about providing strategic technical leadership in the software architecture and design of complex government systems, requiring proven experience leading programs involving 30+ developers in a distributed environment.
Principal Technologist (Req#1227) ePlus TechnologyPrincipal Technologist (Req#1227)King Of Prussia, PA$160,000–$210,000 / yearThe position requires a strong understanding of how technology drives business outcomes and enables the development of strategies aligned to customer objectives The Principal Technologist will be involved in the entire sales cycle, including leading meetings to discuss key business and technology issues, assess clients' needs and identify the ePlus targeted product and service solutions that best meet those needs. 8 or more years of experience in designing or implementing complex networks, systems/storage solutions and ability to articulate deep technical knowledge of infrastructure services, data center design and cloud integration for enterprise customers.
Principal AI Engineer Vertex IncPrincipal AI EngineerPA$159,600–$207,500 / yearThis role sets the strategy and builds the reality for how we build and expose tools (including MCP servers), how we structure retrieval and chunking, and when to rely on specialized sub-agents versus directly exposing tools to a model. The Principal Engineer, AI Orchestration & Retrieval defines how the enterprise's central AI system is composed - the orchestration and abstraction layers that connect LLMs to tools, data, and one another, and the retrieval systems that ground them.
Principal Scientist, Data Science And AI - Princeton, NJ DSMPrincipal Scientist, Data Science And AI - Princeton, NJPrinceton, NJ$180,000–$260,000 / yearWith a deep mastery of multimodal and multiomics data, strong expertise in clinical practice and human health metrics, you will design a world-class R&D engine that systematically mines internal and external datasets to generate evidence for human nutrition and care. Innovation Catalyst: Champion the adoption of state-of-the-art AI tooling, including Generative AI and Large Language Models (LLMs), to revolutionize how the organization synthesizes knowledge and generates novel hypotheses.
Principal - Ostro Client Success Veeva Systems IncPrincipal - Ostro Client SuccessPhiladelphia, PARemote$115,000–$175,000 / yearDeep understanding of the digital ecosystem (websites, banners, social) with a track record of driving strategy for major pharma product launches; hands-on experience with pharmaceutical product communications and Veeva Vault PromoMats submissions. You will champion client needs internally, directly influencing the Veeva Ostro product roadmap, while overseeing large-scope execution, enterprise budgets, and tight deadlines with flawless precision to maximize client ROI.
Senior Principal AI Engineer Vertex IncSenior Principal AI EngineerPA$229,800–$298,700 / yearFull-lifecycle, hands-on mastery across both specialist domains: (a) training and fine-tuning traditional AI/ML models and LLMs - including parameter-efficient methods (QLoRA/LoRA/PEFT), quantization, distributed training, and rigorous evaluation; and (b) LLM orchestration, agentic systems, tool/MCP design, and retrieval/RAG in production. Operate as a full-spectrum AI engineer fluent across the entire lifecycle - data, model training and fine-tuning, retrieval, orchestration, evaluation, and production operations - able to go as deep as any specialist and to compose the pieces into coherent, production-grade systems.
NewPsychiatrist - Principal Investigator, Clinical Research (1099/Part-Time) Hawthorne HealthPsychiatrist - Principal Investigator, Clinical Research (1099/Part-Time)Lindenwold, New Jersey$150–$250 / hourAbout Us Hawthorne Health is a leading community site network and home research visit solution provider, with 20+ sites and more than 2,000 research experienced healthcare professionals across the U.S. Hawthorne leverages convenient, trusted, healthcare locations, identified patient data, and intelligent technology to accelerate patient access, improve retention, and reduce study costs. The Principal Investigator will lead sponsor-initiated psychiatric clinical trials, including studies focused on conditions such as anxiety and depression , while working alongside an experienced team of Sub-Investigators, Clinical Research Coordinators, and centralized clinical operations professionals.
Special Projects Group Principal Geotechnical Engineer - Transportation ECS LtdSpecial Projects Group Principal Geotechnical Engineer - TransportationMount Laurel, New Jersey$125,000–$200,000 / yearECS is currently ranked #60 in Engineering News-Record’s Top 500 Design Firms (April 2026), #148 in Engineering News-Record’s Top 200 Environmental Firms (October 2025) and #38 in Zweig Group’s Hot Firm List (June 2026). Primary responsibilities include pursuit and execution of geotechnical projects in the transportation sector in the northern Mid-Atlantic region , including highway, bridge, and rai l .
Principal Civil Engineer Barry-WehmillerPrincipal Civil EngineerKing Of Prussia, PA$170,000–$240,000 / yearBy blending people-centric leadership with disciplined operational strategies and purpose-driven growth, Barry-Wehmiller has become a $3 billion organization with nearly 12,000 team members united by a common belief: to use the power of business to build a better world. Rooted in our distinct culture of Truly Human Leadership, we cultivate the leaders who will define tomorrow and partner with our clients in the food & beverage, life sciences, industrial, and advanced technology industries to build the future of manufacturing and technology.
Principal Controls Engineer- Data Center Barry-WehmillerPrincipal Controls Engineer- Data CenterKing Of Prussia, PA$150,000–$220,000 / yearMinimum of 15 years of progressive engineering experience in building automation, electrical power monitoring systems (EPMS), and integrated controls within mission-critical environments-especially data centers-including significant leadership and client-facing responsibilities. Design Group is widely known as an industry leader, recognized as a top system integrator, ranking #9 in the 2025 System Integrator Giants; as a Rockwell Platinum Integrator, the highest designation given to Rockwell partners; and as an Ignition Enterprise Premier Integrator.
Principal Financial Analyst - Medicine Finance Penn MedicinePrincipal Financial Analyst - Medicine FinancePhiladelphia, PAThe Principal Financial Analyst communicates complex concepts in a clear manner with managers and senior leadership within the department, as well as other corporate departments (A/P, Purchasing, Finance, Capital Accounting). Penn Medicine is dedicated to our tripartite mission of providing the highest level of care to patients, conducting innovative research, and educating future leaders in the field of medicine.
Confidential Principal's Secretary Clementon School DistrictConfidential Principal's SecretaryLaurel Springs, NJ$1,000–$2,000 / yearExcellent office skills including typing, Word processing, filing, copying, basic record-keeping. Eligibility for enrollment in Disability, Life, Accident, Cancer, Critical Illness, Hospital Confinement Plans with Colonial Life Insurance.