Full stack engineer - AI product

Your role

As a Full Stack Engineer for Neo within Capgemini, you will help build the next generation of Neo, the Group-wide AI platform connecting employees with tools, enterprise knowledge, data and intelligent workflows. This is a hands-on engineering role for someone who can work across frontend, backend and AI-enabled product flows, while contributing to fast iteration, technical quality and scalable implementation.

You will build user-facing AI experiences, backend services and middleware components that connect Neo's frontend with AI/LLM backends, routing services, data sources and enterprise integrations. The role requires strong skills in React, JavaScript/TypeScript, Python, API development, cloud-native engineering and AI-ready application patterns.

In this role you will play a key role in:

• Build highly interactive and scalable frontend experiences using React or comparable frameworks, with strong focus on performance, usability and maintainability.
• Develop backend services and APIs using JavaScript/TypeScript, Node.js and frameworks such as Express.js or NestJS.
• Develop Python-based AI/LLM components, automation scripts, data-processing logic and integration services where required.
• Build middleware capabilities that connect the frontend with AI backends, including session management, prompt handling, permissions logic, routing flags and data workflows.
• Support AI product flows such as conversational interfaces, prompt libraries, file upload flows, RAG-based answers, structured responses, citations and feedback mechanisms.
• Integrate with enterprise services, third-party SaaS platforms, connectors, agents and task automation flows.
• Work with cloud services, preferably GCP, to support scalable, observable and production-ready deployments.
• Write clean, testable and maintainable code with proper unit, integration and end-to-end test coverage.
• Collaborate closely with Product, UX/UI, Engineering Leads, Data Science, Backend, Routing Layer and QA teams to deliver high-quality features.
• Prototype, test and iterate quickly in ambiguous areas where AI behavior, user needs and technical feasibility need to be shaped together.

Your profile

• Bachelor's or Master's degree in Computer Science, Engineering or a related field, or equivalent practical experience.
• Strong hands-on full-stack development experience across frontend, backend and API-driven products.
• Strong frontend experience with React, including component-based development, state management, rendering performance and API integration.
• Experience with modern frontend tooling such as Tailwind CSS, Jest, Cypress, Nx, Module Federation or comparable technologies.
• Strong backend experience with JavaScript/TypeScript, Node.js and frameworks such as Express.js or NestJS.
• Strong Python skills, ideally applied in AI/LLM/ML contexts such as data processing, orchestration, model integration, RAG pipelines, evaluation scripts or backend AI services.
• Solid understanding of REST APIs, microservices, middleware, authentication, authorization, RBAC and secure enterprise integration.
• Understanding of AI application patterns, including LLMs, prompt engineering, RAG, embeddings, vector search, tool calling and conversational interfaces.
• Experience with GCP or other cloud platforms, CI/CD, Git workflows, Docker and production deployment practices.
• Ability to debug complex issues across UI, backend services, cloud infrastructure, data flows and AI model behavior.
• Product mindset with the ability to build fast, test assumptions and iterate based on user feedback.

Bonus:

• Experience with LangChain, LangGraph, FastAPI, Flask, Vertex AI, BigQuery, Firestore or Apigee.
• Experience with MCP, AI agents, Agent2Agent patterns or enterprise conversational interfaces.
• Knowledge of OAuth2, SAML, OpenID Connect or enterprise SSO flows.
• Foundational UX and product design understanding.
• Zero-to-one product experience in fast-moving environments.
  
  

What you'll love about working here

• At the heart of our mission is your career growth. Our array of career growth programs and diverse professions are crafted to support you in exploring a world of opportunities.
• We recognize the significance of flexible work arrangements to provide support. Be it remote work, or flexible work hours, you will get an environment to maintain a healthy work life balance.
• The opportunity to build an AI-first enterprise platform from the inside.
• The chance to work across React, Python, backend services, cloud, agents and AI product experiences.
• A role where engineering, product thinking and AI innovation are deeply connected.

Application:

As part of our recruitment process, identity verification will be conducted through inspection of your ID card, and background checks may be carried out as required.