Senior AI Full-Stack Developer

Marsh McLennan (MMC) 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 are currently seeking a highly skilled and motivated Senior AI Full-Stack Developer to join our Innovation Team. In this role, you will play a vital part in designing, developing, and maintaining state-of-the-art web applications. You will work with a diverse group of talented professionals in a dynamic, start-up-like environment, helping to shape the future of digital solutions. This position will be based in Cluj-Napoca, Romania.

We will count on you to:

• Contribute early to a rapidly evolving field with strong executive backing.

• Experience the excitement of a start-up culture while being backed by a global pioneer in the industry.

• Engage in thrilling initiatives like Hackathons and connect with the broader MMC Tech ecosystem.

• Be part of our strategic tech hub that delivers innovative digital solutions for clients and colleagues alike.

• Embrace a fast-paced, experimental approach with a focus on rapid iteration and a willingness to pivot quickly—adopt a proof-of-concept mindset to drive innovation and efficiency.

• Be able to learn from failures, adapt quickly, and effectively communicate the lessons learned.

• Engage effectively with our counterparts in the Dublin and Cluj AI teams.

• Operationalise prototypes developed by the Dublin or local AI teams.

• Ensure seamless handover of operationalised prototypes to business technology teams.

• Thrive as a collaborative developer in an Agile environment.

• Embrace a lifelong learning mindset, continuously seeking opportunities for improvement.

• Establish and maintain best practice development frameworks and standards, such as Prompt Engineering.

• Develop practices and guidelines to improve consistency and reuse of solutions.

What you need to have:

• Minimum 5 years of relevant experience.

• Proficiency in a modern frontend framework, ideally React (Vue or Angular are also great).

• Hands-on experience with NestJS / NodeJS or a similar technology stack.

• Experience with or knowledge of Python.

• Strong comprehension of RESTful APIs.

• Knowledge of Large Language Models (LLMs).

• Familiarity with prompt engineering techniques.

• Understanding of Retrieval-Augmented Generation (RAG).

• A creative, problem-solving mindset that drives your work.

• Excellent communication skills in both English and Romanian.

What makes you stand out?

• Practical experience with Kubernetes and MongoDB.

• Knowledge of deployments and infrastructure.

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 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 (25 legal days off, 1 extra day off on your birthday, public holiday replacement days, extra buy/sell from your benefits budget);

• 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;