Senior MERN Stack Developer

About the role

We are seeking a Senior MERN Stack Developer to join our AI Innovation Team. You will design, develop, and maintain cutting‑edge web applications while collaborating with a diverse group of professionals in a fast‑moving, start‑up‑like environment.

Key responsibilities

• Develop and maintain full‑stack applications using the MERN stack (MongoDB, Express.js, React, Node.js).
• Contribute to AI‑focused prototypes, operationalise them and hand them over to business technology teams.
• Participate in hackathons, R&D initiatives and the broader MMC Tech ecosystem.
• Work closely with Dublin and Cluj AI teams, ensuring seamless integration and knowledge transfer.
• Promote best‑practice development frameworks, including prompt‑engineering guidelines.

Required profile

• 10+ years of relevant software development experience.
• Strong hands‑on expertise with the MERN stack and modern frontend frameworks (preferably React).
• Experience with NestJS/Node.js or similar backend technologies.
• Knowledge of Python and RESTful API design.
• Excellent communication in English and a creative, problem‑solving mindset.
• Familiarity with GitHub Copilot, LLMs, prompt engineering, RAG and Kubernetes.

Required skills

• MongoDB
• Express.js
• React
• Node.js
• NestJS
• Python
• RESTful APIs
• GitHub Copilot
• Large Language Models (LLMs)
• Prompt Engineering
• Retrieval‑Augmented Generation (RAG)
• Kubernetes

What we offer

• Opportunity to work on innovative AI‑driven projects.
• Dynamic start‑up culture backed by a global industry leader.
• Weekly on‑site collaboration in Dublin with a hybrid work model.
• Continuous learning environment and exposure to cutting‑edge technologies.