Full-Stack Engineer – Digital Client Experience

Marsh McLennan

Full-Stack Engineer driving digital transformation at Marsh with a focus on AI and modern technologies. Collaboration with stakeholders and end users to deliver impactful solutions in a hybrid working environment.

Posted 6/2/2026full-timeLondon • New York • 🇺🇸 United StatesMid-LevelSenior💰 $133,900 - $267,700 per yearWebsite

Tech Stack

Tools & technologies

JavaScriptNode.jsReactSQLTypeScript

About the role

Key responsibilities & impact

Own features end-to-end - from data consumption and querying through API logic to client-facing UI, with minimal handoffs and high autonomy.
Work directly with users and business stakeholders, joining calls, understanding pain points first-hand, shaping solutions collaboratively, and owning delivery through to measurable impact.
Self-source the data you need by navigating our data platform, writing SQL, understanding upstream structures, and working confidently with Databricks or similar lakehouse patterns.
Build and operate scalable, secure pipelines and curated data layers that power analytics, risk insights, and insurance recommendations.
Implement front-end mathematical computations with precision, including exposure analysis, loss projections, premium calculations, and price-impact modelling.
Develop backend services and APIs using TypeScript/Node.js, NestJS, or similar frameworks to support data access, computation, and model inference.
Build modern React experiences, including components, state management, and data-rich interfaces that explain insights and recommendations clearly to end users.
Integrate AI into your engineering workflow using tools such as Copilot, code generation, automated testing, and AI-assisted development practices to improve speed, quality, and throughput.
Stay on the frontier of AI - when a new model drops, a new harness appears, or a better workflow emerges, assess it early, experiment quickly, and bring the best ideas into user and client experiences where they create clear business value.
Build strong insurance and actuarial domain understanding so you can make product-informed engineering decisions and translate ambiguous needs into robust, production-ready software.

Requirements

What you’ll need

Strong experience in TypeScript/Node.js, including NestJS or comparable backend frameworks used in production.
Strong React skills, including component architecture, state management, and experience delivering data-heavy user interfaces.
Strong SQL and data querying skills, with the ability to self-serve from Databricks or similar data platforms.
Solid mathematical and quantitative skills, with the ability to implement and validate computations accurately.
Experience building APIs and services that connect data, computation, and user-facing applications.
High ownership, sound judgment, and comfort working from ambiguous requirements with minimal oversight.
Confidence working directly with users and stakeholders to understand problems and shape practical solutions.
Ability to learn quickly and build domain expertise in insurance, risk, and actuarial concepts.
AI-native development experience, with a track record of using AI tools daily, shaping AI-augmented engineering practices, and staying current with the fast-moving frontier of models, tooling, and techniques.

Benefits

Comp & perks

health and welfare benefits
tuition assistance
401K savings and other retirement programs
employee assistance programs

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

TypeScriptNode.jsNestJSReactSQLDatabricksAPI developmentmathematical computationsdata pipelinesAI integration

Soft Skills

high ownershipsound judgmentproblem-solvingcollaborationcommunicationadaptabilityself-sourcinguser engagementstakeholder managementlearning agility