Marsh McLennan

AI Developer

Marsh McLennan • $90K — $120K *
Toronto, ON M3C 0E3In-Person
Information Technology
Less than 5 years of experience
Today
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Job Overview by Ladders

Qualifications

  • 3+ years of experience in a corporate IT environment
  • 1+ year of experience in AI, Machine Learning, Python, Flask, FastAPI
  • Solid SQL Server & PostgreSQL knowledge
  • Experience with security and compliance best practices
  • Commitment to secure, reliable code with quality standards

Responsibilities

  • Design, build, and maintain scalable backend services and APIs in Python
  • Write clean and efficient Python code focusing on performance and security
  • Develop AI/LLM capabilities as production-grade APIs
  • Implement LLM solutions including prompt design and optimization
  • Build and maintain RAG pipelines and agent/tool-calling workflows
  • Integrate internal and external tools for LLM-based agents
  • Perform evaluation and monitoring of AI/LLM outputs

Benefits

  • Hybrid work flexibility with an emphasis on in-office collaboration
  • Professional development opportunities
  • Supportive team environment with a focus on quality and deadlines
Full Job Description
We are seeking a talented individual to join our team at Marsh. This role will be based in Toronto. This is a hybrid role that has a requirement of working at least three days a week in the office.

We are seeking an AI Developer to design, build, and maintain scalable backend services and APIs in Python, with a strong focus on Flask and FastAPI, including both synchronous and asynchronous patterns. The position also involves developing production-grade AI and LLM capabilities such as REST and WebSocket APIs, RAG pipelines, agent/tool-calling workflows, and model evaluation and optimization across GPT and open-source solutions.

We will count on you to:

  • Designing, building, and maintaining robust, scalable backend services and APIs in Python (focus on Flask and FastAPI, synchronous and asynchronous patterns).
  • Writing clean, efficient, and scalable Python code with strong attention to performance, reliability, and security.
  • Developing and exposing AI/LLM capabilities as production-grade APIs (REST / WebSocket streaming responses, authentication).
  • Implementing Large Language Model (LLM) solutions (GPT family and open-source models) including prompt design, evaluation, versioning, and cost/performance optimization.
  • Build and maintain RAG pipelines (ingestion, embeddings, vector search e.g., pgvector) and agent/tool-calling (MCP / function calling) workflows.
  • Integrating external/internal tools and data sources for LLM-based agents (databases, APIs, file systems, messaging platforms).
  • Integrate data sources (SQL Server, PostgreSQL) and implement efficient schemas, queries, and transaction handling. ORM usage e.g., SQLAlchemy).
  • Applying classical machine learning (scikit-learn) and statistical techniques when they provide simpler or more cost-effective solutions
  • Performing systematic evaluation and monitoring of AI/LLM outputs (quality, hallucination mitigation, latency, cost KPIs) and implementing guardrails/content filtering.


What you need to have:

  • 3+ years of experience in a corporate IT environment
  • 1+ year of experience in Artificial Intelligence, Machine Learning, Python, Flask, and FastAPI; sound software design, debugging, and performance profiling skills.
  • Solid SQL Server & PostgreSQL knowledge (schema design, indexing, optimization; ORM experience).
  • Maintaining adherence to security, privacy, and compliance best practices (secret management, data handling, access control).
  • Strong commitment to secure, reliable, well-documented code ensuring adherence with quality standards.


What makes you stand out:

  • Exposure to containerization and orchestration (Docker, Kubernetes) for deployment workflows.
  • CI/CD familiarity (e.g., GitHub Actions) for automated testing, build, and deployment pipelines.
  • Light JavaScript for integration or tooling.
  • Organized, self-directed, and deadline-focused in distributed team environments.
  • Fast learner, quality conscious and committed to deadlines


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.

This is a Replacement position.

About Marsh McLennan

Marsh McLennan Careers

Join the exceptional team at Marsh McLennan, a global leader in professional services, offering unparalleled job opportunities in insurance, risk management, and consultancy. As the company propels forward, it invites dedicated professionals to contribute to a culture of innovation, leadership, and growth.

Work You’ll Do

At Marsh McLennan, you will engage with complex challenges that push the boundaries of your skills and knowledge. Our team thrives on diversity and the shared goal of delivering impactful solutions to our clients worldwide. By joining us, you will be part of a culture that values diversity training and leadership development, ensuring every team member is equipped for success.

Explore Professional Growth

Marsh McLennan is committed to the professional growth of its employees. Whether you are seeking a position that offers a path to leadership or looking for robust internship programs to kickstart your career, Marsh McLennan provides the resources and global platform to propel your ambitions into achievements. Our benefits package is designed to support the well-being and continuous professional development of all staff, from entry-level to senior leadership roles.

Innovative Work Environment

Our company is at the forefront of industry innovation. The collaboration between experienced professionals and fresh talent generates dynamic solutions that keep Marsh McLennan at the cutting edge of the industry. Our team is encouraged to lead with creativity and embrace new ideas, driving the company’s legacy of pioneering industry-first solutions.

Join Our Team

Marsh McLennan is hiring! Explore the multitude of job opportunities on our careers page, from strategic advisory roles to operational excellence positions. We look for passionate, curious, and solution-driven team players. Enhance your career with Marsh McLennan, where your skills will be honed through challenging projects and high-impact strategies.

Networking and Career Advancement

Networking at Marsh McLennan opens doors to enriching connections and countless opportunities within the industry. Our professionals benefit from an environment that fosters networking through events, professional groups, and collaborative projects. With Marsh McLennan, career advancement is not just a possibility—it is an expectation.

Prepare for Your Interview

Ready to apply? Make sure your resume highlights your most relevant experiences and skills tailored to the position you are applying for. Our interview process is designed to understand your capabilities and fit with our team’s goals and values. Prepare to discuss how your background, experiences, and professional aspirations align with the opportunities at Marsh McLennan.

Stay Connected

Keep up to date with the latest from Marsh McLennan: - **Career Insights**: Gain insider perspectives and industry-leading insights through our careers blog. - **Job Alert Emails**: Personalize your subscription to receive job alerts and the latest news tailored to your preferences. Discover the rewarding career opportunities awaiting at Marsh McLennan, where your professional journey is just the beginning. Join us in shaping a future defined by insight, integrity, and innovation.
Learn more about Marsh McLennan
Size
83,000 employees
Market Cap
$82.6 billion
Industry
Finance & Insurance
Net Income
$2 billion
Founded
1914
5 Year Trend
+8.5%
Revenue
$17.2 billion
NASDAQ
MMC
* Ladders Estimates

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