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Ernst & Young

Global professional services: consulting, tax, assurance.

GenAI Senior Developer - AI & Data

Full-Time
$106.9k - $200.6k
Mid, Senior
Bachelor's, Master's
Washington, DC, USA+1 moreMore locations: McLean, VA, USA
HybridWork may be at client, EY, or contractor sites; travel of 20–30% or more may be required.
Software EngineeringAI Application Engineering, Full-Stack Engineering

About the job

Requirements
  • Must have a bachelor's degree.
  • Must be eligible to obtain and maintain a Secret Clearance.
  • Must have at least 3–5+ years of experience with modern web development, including JavaScript or TypeScript.
  • Must have at least 3–5+ years of experience with back-end development, such as Node.js, Python, or FastAPI.
  • Must have at least 3–5+ years of experience integrating generative AI models into applications through APIs or fine-tuned models.
  • Must have at least 3–5+ years of experience deploying applications on cloud platforms such as AWS, Azure, or Vercel.
  • Must understand statistical modeling, ETL, data ingestion and cleansing, and data engineering.
  • Must have hands-on experience with big data technologies in one or more ecosystems, such as Hadoop, AWS, or Microsoft.
  • Must be comfortable working in person as needed.
  • Must be willing to travel 20–30% or more, depending on client and project needs.
Responsibilities
  • Design and optimize applications that leverage modern web frameworks and AI models.
  • Support government clients by delivering data science and big data technologies and practices.
  • Design, build, and maintain scalable and robust solutions that unify, enrich, and analyze data from multiple sources.
  • Implement generative AI models, work with AI/ML engineers, develop web applications, and ensure quality and product excellence.
  • Use JavaScript and frameworks such as React, Next.js, or similar for web development.
  • Develop back-end systems using Python, FastAPI, or similar technologies.
  • Use cloud platforms such as AWS, Azure, and Vercel.
  • Develop, maintain, and improve web applications using modern frameworks such as React, Next.js, Svelte, Vue, and Remix/React Router.
  • Integrate generative AI models, including OpenAI, Anthropic, and open-source large language models, into web-based products.
  • Work with designers, product managers, and AI/ML engineers to create intelligent user experiences.
  • Write tests and participate in code reviews.
  • Design, architect, and develop solutions using big data technology such as open source technologies, Hortonworks, AWS, or Microsoft to ingest, process, and analyze large, disparate data sets and exceed business requirements.
  • Unify, enrich, and analyze customer data to derive insights and opportunities.
  • Leverage in-house data platforms as needed and recommend and build new data platforms or solutions as required to exceed business requirements.
  • Communicate findings, recommendations, and opportunities to improve data systems and solutions.
  • Teach data science concepts, tools, features, functions, and the benefits of different approaches.
  • Seek information about emerging methodologies and technologies.
  • Clarify problems by identifying the underlying issue.
  • Identify opportunities to improve methods and outcomes.
  • Apply data-driven approaches, including KPIs, to connect technology solutions to specific business outcomes.
  • Collaborate, influence, and build consensus through constructive relationships and effective listening.
  • Use data in decision-making to solve problems.
  • Complete work at client, EY, and/or contractor sites as required.
Desired Qualifications
  • Experience with vector databases and AI inference optimization.
  • Experience with open-source AI and web projects.
  • Experience with retrieval-augmented generation (RAG) or fine-tuning models.
  • A bachelor's degree or higher in mathematics, information systems, statistics, computer science, or a related discipline.
  • A thorough business understanding of data science applications and the ability to communicate with key decision-makers.
  • Ability to listen, understand questions, and develop and deliver clear insights.

About the company

EY is a global professional services firm that offers consulting, assurance (audits), tax, and transaction advisory services to a wide range of clients including corporations, SMEs, and government entities. It earns fees for these services and uses its industry expertise and a worldwide network to help clients optimize operations, manage risk, and achieve sustainable growth. EY differentiates itself through its scale and reach, industry specialization, focus on end-to-end services, strategic alliances, and emphasis on innovation and sustainability, including improving audit quality and addressing digital economy needs and supply chain visibility. The company’s goal is to help clients navigate complex regulatory and business environments, transform finance and tax functions, and drive efficiency and resilience across their operations.

Company Size

1,001-5,000

Company Stage

N/A

Total Funding

N/A

Headquarters

London, United Kingdom

Founded

1991

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Simplify's Take

What believers are saying

  • EY.ai Agentic for Sales launched March 2, 2026 with Snowflake and Canva.
  • EY uses client-zero deployments, scaling Copilot across 400,000 people by May 2026.
  • EY’s 2026 AI assurance push monetizes client demand for governance, controls, and risk reviews.

What critics are saying

  • Sabah filed RM2.4 billion audit-negligence claims against EY on July 30, 2026.
  • EY set aside £188 million in March 2026 after NMC, Shell, and Made.com scrutiny.
  • Repeated audit failures can destroy trust, trigger client defections, and shrink the franchise permanently.

What makes Ernst & Young unique

  • EY Canvas processes 1.4 trillion journal-entry lines across 160,000 global audits.
  • EY-Microsoft invested US$1b+ in May 2026 to industrialize enterprise AI delivery.
  • EY launched agentic audit AI on April 7, 2026, spanning Assurance and AI assurance.

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Benefits

  • Professional Development Budget
  • Flexible Work Hours
  • Remote Work Options

Company News

PR Newswire
Oct 19th, 2026
MedTech revenue hits $650B as M&A value jumps to $130B and financing reaches record $63B

EY's 20th Pulse of the MedTech Industry report finds the global medical technology industry at a turning point, with record financing and dealmaking but growth concentrated among a few leaders. MedTech revenue reached about $650 billion in 2025, up 11%. In the first half of 2026 it hit $325 billion, up 7.1% year on year. Financing hit a record $63 billion in the year to June 30, 2026, up 87%. Initial public offerings and debt made up about 80% of it. M&A value reached roughly $130 billion, the highest in over a decade, driven by a few blockbuster deals. First-half 2026 deal value rose 160% against the same period in 2025. "The broader sector players are at a turning point where discipline is essential to convert innovation into profitable growth," said John Babitt, EY Global MedTech Leader.

Business Insider
Oct 8th, 2026
EY adds nearly 10,000 staff globally as AI revenue surges 50%

EY added nearly 10,000 staff globally in its 2026 financial year as AI-related revenue surged almost 50%. The Big Four firm's workforce reached 415,000, with most growth concentrated in global delivery services and offshoring centres. The Americas division saw headcount decrease by roughly 4,500, or 5%. Overall global revenue rose 4.7% to $57 billion. EY-Parthenon was the fastest-growing service line, with revenue increasing 7.4% to $6.8 billion, marking a turnaround after two years of minimal growth. Tax revenue rose 6% to $13.8 billion, whilst consulting grew 4.4% to $17.4 billion. The results reflect EY's "All-In" strategy under global chair Janet Truncale, with billions invested in transforming operations and AI services.

PR Newswire
Sep 9th, 2026
US oil producers hit record output as capital spending drops 49% and reserve replacement falls

An Ernst & Young study found US oil and gas producers reached record production in 2025 while becoming more selective with investments. The analysis of 30 major exploration and production companies, representing 43% of US oil and gas output, showed oil production hit a study-period high, yet reserve additions from extensions and discoveries declined 11% year over year and failed to fully replace production volumes for the first time since 2021. Total capital expenditures fell 49% year over year, whilst M&A spending declined 70%. Exploration spending dropped 11% to $4.8 billion, representing only 3% of total capital expenditures. Natural gas showed stronger fundamentals, with production rising 18%, reserves increasing 14%, and discoveries up 21%.

Yahoo Finance
Aug 31st, 2026
EY commits $100M to bonuses rewarding human skills alongside AI adoption

Ernst & Young's US division is allocating $100 million this fiscal year to bonus payments rewarding employees who demonstrate adaptability, innovation, and judgement. Individual spot awards reach $500, whilst employees or teams making significant contributions can receive between $10,000 and $25,000, five times the previous programme's ceiling. The initiative also covers AI experimentation. "What we recognise signals what we value," said Ginnie Carlier, chief talent and culture officer for EY Americas. The bonuses form part of a broader strategy to reshape employee development across all career levels. Other professional services firms are pursuing similar approaches. KPMG restructured its audit internship this summer to emphasise critical thinking, whilst PwC US introduced training combining AI proficiency with human qualities like empathy. EY reported AI-related revenue grew 30% year-over-year in 2025.

Consultancy.eu
Aug 28th, 2026
EY-Parthenon acquires Dutch digital strategy consultancy SparkOptimus

EY-Parthenon has acquired SparkOptimus, a Dutch digital strategy consultancy founded in 2010. The Amsterdam-based firm employs around 50 consultants and specialises in AI transformation, digital business model redesign and technology-driven transformation. SparkOptimus founders Alexandra Jankovich and Tom Voskes, both former McKinsey consultants, said joining EY-Parthenon will create significant value for clients and staff whilst providing access to broader capabilities. The acquisition marks EY-Parthenon's first European deal since 2021. EY-Parthenon, established in 2014, is EY's strategy consulting and transactions advisory business with around 25,000 professionals globally. Mark Reich, Partner at EY-Parthenon Netherlands, said SparkOptimus' expertise will complement existing capabilities in the Dutch market. The deal closes on 1 September 2026. Financial terms were not disclosed.