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Marsh & McLennan

Brokers insurance and runs risk and HR consulting

Senior Lead AI Engineer

Full-TimeUpdated on 10/24/2026
$195k - $250k+ Performance-based incentives
Senior
Boston, MA, USA+3 moreMore locations: Washington, DC, USA | Chicago, IL, USA | New York, NY, USA
HybridHybrid; colleagues are expected in their local office or onsite with clients at least three days per week.
Software EngineeringAI Application Engineering
Company Does Not Provide H1B Sponsorship

About the job

Requirements
  • Technical background in computer science, data science, machine learning, artificial intelligence, statistics, or another quantitative and computational science.
  • Track record of designing and deploying large-scale technical solutions that deliver tangible, ongoing value.
  • Direct experience building and deploying robust, complex production systems implementing modern artificial intelligence at scale.
  • Ability to make consequential design decisions and act rapidly in time-boxed large-project environments.
  • Fluency in modern programming languages for artificial intelligence and agents across the end-to-end artificial intelligence development lifecycle.
  • Knowledge of one or more agentic platforms, including Azure Foundry, AWS Bedrock, or Gemini Enterprise Agent Platform.
  • Deep familiarity with the architecture, performance characteristics, and limitations of compound artificial intelligence systems, including retrieval-augmented generation, tool use, agentic memory, and multi-agent orchestration.
  • Experience designing and operating evaluation frameworks and observability tooling to measure artificial intelligence system quality, detect failure modes, and maintain production performance.
  • Proficiency in large language model system design, including prompt engineering, context and token management, structured output, fine-tuning tradeoffs, and cost and latency optimization.
  • Practical awareness of artificial intelligence risk, bias, and governance, including identifying and mitigating failure modes in high-stakes or regulated environments.
  • Theoretical grounding in the mathematical foundations of artificial intelligence and machine learning.
  • Applied understanding of a class of modelling or analytical techniques.
  • Fluency in the mathematical principles and generalizations of data science, such as statistics, linear algebra, and vector calculus.
Responsibilities
  • Explore data and craft artificial intelligence solutions to answer core business problems.
  • Work with Partners and Principals to shape proposals that leverage artificial intelligence and engineering capabilities.
  • Build and deploy large language model-based agent systems in production.
  • Keep up with the state of the art in the role's domain and develop familiarity with emerging modelling and data engineering methodologies.
  • Advocate application of best practices in modelling, code hygiene, and data engineering.
  • Lead development of proprietary artificial intelligence and machine learning solutions, algorithms, analytical tools, and infrastructure on projects and asset development.
  • Work alongside Oliver Wyman partners in Quotient and other practice groups, engage directly with clients to understand their business challenges, and craft appropriate solutions in collaboration with other specialists and consultants.
Desired Qualifications
  • A history of compelling side projects or contributions to the open-source community.
  • Experience presenting at high-impact artificial intelligence and machine learning engineering conferences and strong connections to the engineering community, such as through meetups, open-source contributions, or ongoing relationships with academics.
  • Interest or background in financial services, healthcare and life sciences, consumer, retail, energy, or transportation industries.

About the company

Marsh & McLennan Companies, which operates under the Marsh brand, is an insurance broker and consulting group serving businesses, governments and institutions worldwide. Its Marsh Risk unit arranges property, casualty, cyber and employee-benefit coverage, while Guy Carpenter places reinsurance for insurers. Mercer advises employers on pay, benefits, retirement and investments, and Oliver Wyman, Lippincott and NERA handle strategy, brand and economic consulting. Brokers earn commissions and fees from placing coverage, and consultants bill client fees or charge fees based on assets or plan members. The company traces its roots to 1871 and is headquartered in New York City.

Company Size

10,001+

Company Stage

N/A

Total Funding

N/A

Headquarters

New York, NY

Founded

1871

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Simplify Jobs

Simplify's Take

What believers are saying

  • Consulting drives growth: Mercer and Oliver Wyman's group grew 8% organically in the June 2026 quarter, versus 3% for broking.
  • Profits cushion jobs: Marsh kept about 27 cents of operating profit per sales dollar in 2025, before one-time costs.
  • Many career paths under one employer: 95,000+ colleagues span broking, reinsurance, benefits and strategy consulting in 130 countries.

What critics are saying

  • Expect cuts: Thrive, announced October 2025, sets aside $500 million, mostly severance and technology, to save $400 million yearly.
  • Pricing works against broking: Marsh's index shows commercial rates fell 6% in the June 2026 quarter, an eighth straight drop.
  • Back-office roles are being consolidated: a Business and Client Services unit is pooling operations and technology teams company-wide.

What makes Marsh & McLennan unique

  • Consulting is a third of the business: Mercer and the Oliver Wyman group earned 36% of 2025 revenue.
  • Investment management sets it apart: Mercer is the world's largest outsourced chief investment office, running portfolios for institutions.
  • Scale sets it apart: 2025 revenue grew 10% to $27.0 billion across broking, reinsurance and consulting.

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