Government and Infrastructure - AI & Data - Ontology Senior Analyst

Ernst & Young Advisory Services Sdn Bhd; McLean (VA); On-site; USD 107,000 - 177,000; Full time

Job summary

EY is seeking an Ontology Senior Analyst to support the Government and Infrastructure AI & Data practice in McLean. You will help design ontologies, semantic data models, and governance structures while collaborating with clients and stakeholders to deliver analytics-ready data solutions and dashboards for mission-critical programs.

The role emphasizes in-person work as needed and involves engagement across government clients, leveraging Palantir Foundry to enable ontology-driven analytics,

Qualifications

• Bachelor's degree required.
• 3-5+ years of AI & Data experience.
• Comfortable working in-person as needed.

Responsibilities

• Design and implement enterprise ontologies and semantic data models that translate business processes into analytics-ready structures.
• Map enterprise data products into ontology-driven environments to support analytics and decision-making.
• Collaborate with business owners, data architects, engineers, and end users to define data definitions, rules, and governance.

Skills

Ontology design

Semantic data models

Data governance

Stakeholder collaboration

Education

Bachelor's degree

Tools

Palantir Foundry

Job description

Government and Infrastructure - AI & Data - Ontology Senior Analyst

Location: McLean

Other locations: Primary Location Only

Date: Oct 4, 2026

Requisition ID: 1733851

At EY, we’re all in to shape your future with confidence.

We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go. Join EY and help to build a better working world.

Government and Infrastructure – Technology Consulting - AI & Data – Ontology Senior

From strategy to execution, the Government and Infrastructure practice of Ernst & Young provides a full range of consulting and audit services to help our Federal, State, Local and Education clients implement new ideas to help achieve their mission outcomes. We deliver real change and measurable results through our diverse, high-performing teams, quality work at the highest professional standards, operational know-how from across our global organization, and creative and bold ideas that drive innovation. We enable our government clients to achieve their mission of protecting the nation and serving the people; increasing public safety; improving healthcare for our military, veterans, and citizens; delivering essential public services; and helping those in need. EY is ready to help our government build a better working world.

EY delivers unparalleled service in big data, business intelligence, and digital analytics built on a blend of custom-developed methods related to customer analytics, data visualization, and optimization. We leverage best practices and a high degree of business acumen that has been compiled over years of experience to ensure the highest level of execution and satisfaction for our clients. At EY, our methods are not tied to any specific platforms but rather arrived at by analyzing business needs and making sure that the solutions delivered meet all client goals.

The opportunity

You will help our clients navigate the complex world of modern data science and analytics. We’ll look to you to provide our clients with a unique business perspective on how data science and analytics can transform and improve their entire organization – starting with key business issues they face. This is a high growth, high visibility area with plenty of opportunities to enhance your skillset and build your career.

We’re seeking a highly motivated Senior Engineer to support a DOD client in the design, development, and deployment of data analytics, business intelligence, workflow automation, and low-code application solutions. This individual will work directly with the client and civilian government stakeholders to transform business requirements into actionable analytics, dashboards, and mission-support applications that improve operational effectiveness, transparency, and decision-making.

This position supports a growing portfolio of work focused on operational analytics, enterprise reporting, workflow modernization, AI-enabled tools, and Power Platform-based solutions.

Your key responsibilities

You’ll spend most of your time working with a wide variety of clients delivering the latest data science and big data technologies and practices to design, build and maintain scalable and robust solutions that unify, enrich and analyze data from multiple sources.

Skills and attributes for success

• Demonstrated experience designing and implementing enterprise ontologies, semantic data models, or operational data frameworks that translate business processes, assets, work orders, and performance measures into reusable analytics-ready data structures. Based on PAE SI requirements, this includes defining ontology objects, relationships, and governance models aligned to mission outcomes.
• Experience mapping curated enterprise data products into ontology-driven environments and establishing standardized relationships between entities to support analytics, reporting, and operational decision-making. This includes translating Gold-layer data into mission-relevant business objects and enabling downstream consumption.
• Experience facilitating collaboration among business owners, data architects, engineers, and end users to define data definitions, business rules, object hierarchies, metadata standards, and data governance requirements that support trusted partners.

To qualify for the role, you must have

• Must be eligible to obtain and maintain aSecret Clearance
• Must have a bachelor's degree
• Must have 3-5+ years of related experience within AI & Data
• Must be comfortable working in-person as needed
• Experience designing and implementing enterprise ontologies, semantic data models or operational data frameworks
• Experience mapping enterprise data products into ontology – driven environments and establishing standardized relationships between entities to support analytics, reporting, and decision-making.

Ideally, you’ll also have

• Experience with Palantir Foundry, including ontology development, object modeling, Workshop applications, data materialization, pipeline integration, and operational decision-support use cases.
• Experience supporting DOD clients, shore infrastructure, logistics, asset management, facilities management, maintenance operations, or readiness-focused analytics environments, with knowledge of how operational processes translate into data models and decision-support products.
• Experience developing governance processes for ontology lifecycle management, including version control, metadata management, object stewardship, change control, and alignment between source-system data structures and operational business processes.

Due to the nature of our work in the Government and Infrastructure, work may be required to be completed at client, EY and/or contractor sites. Our goal is to assign professionals to projects within a commutable distance of their work location office. In certain circumstances, travel may be required beyond your work location based on client and project needs. Candidates should be willing to travel 20 – 30% or more.

What we look for

We’re interested in passionate leaders with strong vision and a desire to stay on top of trends in the Data Science and Big Data industry. If you have a genuine passion for helping businesses achieve the full potential of their data, this role is for you.

At EY, you’ll have the chance to build a career as unique as you are, with the global scale, support, inclusive culture, and technology to become the best version of you. And we’re counting on your unique voice and perspective to help EY become even better, too. Join us and build an exceptional experience for yourself, and a better working world for all.

What we offer you

What we offer you
At EY, we harness our collective strength to empower you to shape your future with confidence through professional growth, personal fulfillment and an inclusive culture. Learn more at ey.com/us/careers.

• We offer a comprehensive compensation and benefits package where you’ll be rewarded based on your performance and recognized for the value you bring to the business. The base salary range for this job is:
• New York City, Boston, and Washington DC Metro Areas, Washington State, and Southern California offices – $128,400 to $192,500
• Bay Area California offices – $133,600 to $200,600
• All other offices locations in the US, including Sacramento – $106,900 to $176,500
• Individual salaries within these ranges are determined through a wide variety of factors including but not limited to education, experience, knowledge, skills and geography. In addition, our Total Rewards package includes medical and dental coverage, pension and 401(k) plans, and a wide range of paid time off options.
• Under our flexible vacation policy, you’ll decide how much vacation time you need based on your own personal circumstances. You’ll also be granted time off for designated EY Paid Holidays, Winter/Summer breaks, Personal/Family Care, and other leaves of absence when needed to support your physical, financial, and emotional well-being.

EY | Building a better working world

EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets.

Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.

EY teams work across a full spectrum of services in assurance, consulting, tax, strategy and transactions. Fueled by sector insights, a globally connected, multi-disciplinary network and diverse ecosystem partners, EY teams can provide services in more than 150 countries and territories.

All in to shape the future with confidence.

EY provides equal employment opportunities to applicants and employees without regard to race, color, religion, age, sex, sexual orientation, gender identity/expression, pregnancy, genetic information,national origin, protected veteran status, disability status, or any other legally protected basis, including arrest and conviction records, in accordance with applicable law.

EY is committed to providing reasonable accommodation to qualified individuals with disabilities including veterans with disabilities. If you have a disability and either need assistance applying online or need to request an accommodation during any part of the application process, please call 1-800-EY-HELP3, select Option 2 for candidate related inquiries, then select Option 1 for candidate queries and finally select Option 2 for candidates with an inquiry which will route you to EY’s Talent Shared Services Team (TSS) or email the TSS at [e-mail] .

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