Principal AI Engineer

Job Description: The Principal AI Engineer provides technical leadership in the design, development, training, orchestration, and operationalization of enterprise AI systems. This role defines strategy and technical standards across traditional AI/ML models, large language models, model training and fine-tuning, data and retrieval systems, and agentic AI architectures. The Principal AI Engineer remains deeply hands-on while partnering across product and platform teams to build scalable, reliable, secure, and high-quality AI capabilities. Essential Job Functions and Responsibilities Define and own technical strategy across enterprise AI systems, spanning traditional AI/ML models, large language models, model training and fine-tuning, retrieval, orchestration, and agentic AI. Design, train, fine-tune, evaluate, and optimize traditional AI/ML models and large language models using parameter-efficient techniques (e.g., QLoRA, LoRA, PEFT) and full fine-tuning where warranted. Design orchestration and abstraction layers that connect LLMs to enterprise tools, data, APIs, and specialized sub-agents while decoupling product teams from underlying models and providers. Design, build, and operate MCP (Model Context Protocol) servers and establish standards for how AI tools and capabilities are defined, exposed, versioned, and consumed. Design and optimize retrieval (RAG) systems, including chunking strategies, embedding models, vector stores, hybrid/keyword search, re-ranking, and context assembly. Design and optimize data pipelines for ingestion, cleaning, labeling, feature engineering, storage, versioning, and reuse of training, validation, and test datasets. Build reproducible AI/ML pipelines and establish standards for experiment tracking, dataset management, model versioning, checkpoints, metrics, and evaluation. Define evaluation methodologies and benchmarks across model, retrieval, and orchestration quality, including regression testing, retrieval precision/recall, tool-selection accuracy, task success, latency, and cost. Build routing, context-window management, memory, observability, and tracing strategies for multi-step and agentic AI workflows. Establish practices for AI data governance, lineage, quality, licensing/consent, PII handling, safety, guardrails, authentication, and access control. Partner with product and platform teams to operationalize AI capabilities, onboard tools and agents, and transition trained and fine-tuned models into production. Mentor engineers, establish technical standards and best practices, and raise AI engineering maturity across teams. Knowledge, Skills, and Abilities Strong hands-on experience designing, training, fine-tuning, and deploying traditional AI/ML models and large language models in production environments. Deep experience with parameter-efficient fine-tuning (QLoRA, LoRA, PEFT), quantization, model evaluation, and the tradeoffs between fine-tuning approaches. Deep hands-on experience with LLM orchestration, agentic AI patterns, MCP servers, tool/function calling, and frameworks such as LangGraph, LlamaIndex, Semantic Kernel, or equivalents. Deep experience with retrieval/RAG architectures, including chunking strategies, embeddings, vector databases, hybrid search, re-ranking, and context assembly. Proficiency with ML/DL frameworks and libraries such as PyTorch, Hugging Face Transformers/PEFT/TRL, and scikit-learn. Experience building and operating scalable data and AI pipelines and platforms using technologies such as Spark, Ray, dbt, or equivalents. Strong understanding of AI/ML data management, including dataset storage architecture, versioning, lineage, governance, quality, and PII handling. Experience with AI/ML evaluation, experiment tracking, reproducibility, observability, distributed training, and compute, cost, and latency optimization. Ability to define enterprise AI strategy, architecture, technical standards, and best practices while remaining hands-on in code. Strong stakeholder collaboration, technical leadership, mentoring, and problem-solving skills. Education and Experience Bachelor’s degree in Computer Science, Engineering, or related discipline; advanced degree in ML, AI, or Data Science preferred 12 or more years of experience in AI/ML engineering, applied ML, or data engineering, with significant hands-on model training and fine-tuning Disclaimer The above statements describe the general nature and level of work performed in this role. Other duties may be assigned. COMMENTS: The above statements are intended to describe the general nature and level of work being performed by individuals in this position. Other functions may be assigned, and management retains the right to add or change the duties at any time. Vertex Values: Together We Win We're building a team of people who are passionate about making an impact for our customers and committed to how that impact is achieved. Our values define the behaviors, mindset, and culture that make Vertex a great place to grow and do meaningful work. Play to Win or We Don't Play — If we choose to do something, we're choosing to do it because we plan to win. That mindset raises our bar on product quality, customer outcomes, and how we show up for one another. Work As a Team, Putting the Customer At the Core — Our customers are our true north. Whatever your role, ask: how will this help a customer succeed today? We earn trust through outcomes, not promises. Achieve Excellence With Integrity, Speed, and Agility — The market isn't slowing down. We'll move faster, adapt quickly, and never compromise on doing things the right way — for teammates, customers, and partners. Innovate Boldly With a Growth Mindset — Progress demands smart risk. We'll try new approaches, learn fast, and keep pushing the boundaries — especially where AI can remove friction and unlock value. Communicate with Care, Candor and Transparency — Honest, constructive conversations make us better. Let's speak plainly about what's working and what isn't and help each other improve. Pay Transparency Statement: US Base Salary Range: $159,600.00 - $207,500.00 Base pay offered to new hires may vary based upon factors including relevant industry and job-related skills and experience, geographic location, and business needs.* The range displayed does not encompass the full potential of the role, which allows for further growth and career progression. In addition, as a part of our total compensation package, this role may be eligible for the Vertex Bonus Plan (VOB), a role-specific sales commission/bonus, and/or equity grants. Learn more about Life at Vertex and connect with your recruiter for more details regarding Vertex's compensation and benefit programs. *In no case will your pay fall below applicable local minimum wage requirements. Join our Talent Community to stay updated on the latest job opportunities, news, and events tailored to your career interests. Vertex is an Affirmative Action and Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability. If you'd like to view a copy of the company's affirmative action plan, please email AskHR@vertexinc.com. If you are an individual with a disability and would like to request a reasonable accommodation as part of the employment selection process, please contact 610-640-4200 or AskHR@vertexinc.com. This telephone line and email address is reserved solely for job seekers with disabilities requesting accessibility assistance or an accommodation in the job application process. Please do not call about the status of your job application if you do not require accessibility assistance or an accommodation. Messages left for other purposes, such as following up on an application or non-disability related technical issues, will not receive a response.