Senior FullStack Developer

Location: Mexico City - Paseo

Remote Type: Hybrid

Time Type: Full time

Job Description

Company:

Oliver Wyman

Description:

Senior FullStack Developer

We are seeking a Senior FullStack Developer to join our team at Marsh. This role will be based in Mexico City. This is a hybrid role that has a requirement of working at least three days a week in the office. As a Senior Fullstack Developer at Marsh, you will play a key role in evolving solutions from early proof of concept through scalable, production-ready systems used by internal stakeholders. In this role, you are relied upon to ensure solutions meet enterprise standards for security, reliability, scalability, maintainability, and testability, and help teams apply generative AI responsibly and effectively in production environments.

We will count on you to:

• Lead the technical design and delivery of complex, AI-enabled features or services.
• Design, build, and evolve full-stack applications using modern frontend and backend frameworks.
• Build and maintain robust, high-performance APIs using NestJS / NodeJS or FastAPI / Python.
• Integrate Large Language Model (LLM) capabilities into production systems, selecting appropriate patterns, tools, and architectures.
• Guide the evolution of proofs of concept into production-ready, scalable solutions within enterprise constraints.
• Own technical solutions end-to-end, including design, implementation, deployment, and operational readiness.
• Make sound engineering decisions that balance security, scalability, reliability, maintainability, and testability.
• Act as a hands-on engineer: write production code, review code, and contribute to testing and observability.
• Champion strong engineering practices, including code quality, testing, CI/CD, and documentation.
• Identify opportunities for reuse and contribute to shared components, patterns, and standards.
• Collaborate closely with product, architecture, security, and platform teams in an Agile delivery environment.
• Provide technical guidance and mentorship to other engineers through design discussions and examples.
• Contribute to continuous improvement of engineering practices within the team or domain.

What you need to have:

• 6+ years of professional software engineering experience, including building and operating production systems.
• 2+ years of hands-on experience working with Large Language Models (LLMs) in applied or production contexts.
• Strong proficiency in a modern frontend framework, ideally React with TypeScript.
• Deep hands-on experience with NodeJS / NestJS and/or Python (FastAPI or Django).
• Strong understanding of API design, distributed systems, and service-oriented architectures.
• Proven experience deploying, operating, and supporting systems in cloud environments.
• Experience working in Agile delivery teams and collaborating across disciplines.
• Strong communication skills, with the ability to explain technical concepts to a range of audiences.
• Advanced Level of English is a Must

Why join our team:

• We help you be your best through professional development opportunities, interesting work and supportive leaders.
• We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have impact for colleagues, clients and communities.
• Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well-being.

Marsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit corporate.marsh.com, or follow us on LinkedIn and X.

Marsh is committed to creating a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age, background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law.

Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.