AI Full-Stack Developer @OW

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Join Oliver Wyman’s AI Team in Cluj‑Napoca – Build AI‑enabled web apps with React, TypeScript and LLMs.

Hybrid role, 3+ days in office, remote‑friendly, focus on AWS, REST API, Agile, and continuous learning.

Company:

Oliver Wyman

Description:

Job Description For Posting

We are seeking a talented AI Full-Stack Developer to join us in Cluj‑Napoca, Romania at our EMEA Technology Hub. This is a hybrid role that has a requirement of working at least three days a week in the office.

The ideal candidate will design, build and deploy AI-enabled web applications across the full stack, integrating modern front-end and back-end frameworks, working with Large Language Models (LLMs) and related ML components, and operating services in cloud environments

Also, you will have hands-on experience with modern web and server-side technologies, familiarity with both relational and non-relational data stores, and practical exposure to deploying and maintaining cloud-based systems.

Marsh has established its EMEA Technology Hub in Cluj, Romania, reflecting our commitment to innovation and excellence. This hub is central to our digital strategy, addressing emerging challenges and enhancing service delivery through advanced technology solutions that empower our clients and promote sustainable growth.

We will count on you to

• Design, develop, and maintain scalable web applications using React with TypeScript.
• Build robust and high-performance APIs using NestJS/ NodeJS or FastAPI/ Python.
• Integrate applications with Large-Language Models (LLM) APIs.
• Embrace a fast-paced, experimental approach with a focus on rapid iteration and a willingness to pivot quickly and adopt a proof-of-concept mindset to drive innovation and efficiency.
• Deploy and monitor applications on AWS cloud infrastructure.
• Utilize both SQL and NoSQL database solutions.
• Work closely with cross-functional teams in an agile environment, participating in daily stand‑ups, sprint planning, and retrospectives.
• Write clean, maintainable, and well-documented code following best engineering practices.
• Be able to learn from failures, adapt quickly, and effectively communicate the lessons learned.
• Embrace a lifelong learning mindset, continuously seeking opportunities for improvement.
• Proven ability to work efficiently as part of a distributed (remote/virtual) team.

What you need to have

• Excellent communication both in English and Romanian
• Minimum 3-4 years of relevant experience.
• Minimum 1-2 years of relevant hands‑on LLM experience
• Knowledge of Large-Language Models (LLM).
• Proficiency in a modern front‑end framework, ideally React with TypeScript (Angular is also great).
• Hands‑on experience with NestJS / NodeJS.
• Experience with or knowledge of FastAPI or Django/ Python.
• Strong comprehension of RESTful APIs.
• Demonstrated experience working in an Agile environment
• Excellent communication both in English and Romanian.

Nice to have

• Understanding of Retrieval‑Augmented Generation (RAG).
• Some knowledge of LanghChain, LangGraph, LlamaIndex, CrewAI or similar.
• Some knowledge of AI Agents.
• Familiarity with prompt engineering techniques.
• Some exposure to AWS cloud services.

Why join our team

Work in an environment that empowers individuals to reach their full potential, fostering personal and professional growth

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 an 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;

A yearly budget and the opportunity to build your flexible benefits package (up to 20% of your annual salary);

30+ days off (including legal days, birthday, public holiday replacements, and benefits options);

Performance bonus scheme;

Matching charity contributions, charity days off, and the Pay it Forward charity challenge;

Core benefits: Pension, Life and Medical Insurance, Meal Vouchers, Travel Insurance

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.