Conversational LLM AI Expert (Freelance)

Location: Brussels, Belgium (Hybrid: 2-3 days remote per week)

Status: Freelance

About Smile

Passionate about tech, digital, and innovation? Join the 1,800 employees at Smile, the European leader in open-source integration, spread across 20 agencies in 9 countries. Collaborative spirit and knowledge sharing are at the heart of our DNA. Our experts push the boundaries of open source every day to build a smarter, more efficient, and more responsible digital world. Here, we don't just follow trends, we create them! Join Smile in Brussels and take part in projects that truly matter!

The Role

We are actively looking for highly skilled Conversational LLM AI Experts at Junior, Medior, and Senior levels to join our team on behalf of one of our major clients. In this role, you will be at the forefront of AI innovation, designing, deploying, and optimizing cutting-edge conversational systems, Large Language Models (LLMs), and retrieval-augmented generation (RAG) architectures.

Depending on your seniority level, you will either help build and test conversational flows or drive the end-to-end AI architecture, leading security, scalability, and performance strategies.

Key Responsibilities

• LLM Integration & Python Development: Develop and integrate robust LLM applications leveraging frameworks such as LangChain, LlamaIndex, and Python.

• RAG & NLP Architecture: Design and optimize Retrieval-Augmented Generation (RAG) pipelines, vector databases, and advanced Natural Language Processing (NLP) systems.

• Prompt Engineering & Conversational Design: Craft highly effective prompt strategies and design intuitive, multi-turn conversational experiences using tools like Botpress or Rasa.

• Full-Stack & DevOps Delivery: Build clean Frontend/Backend integrations to support AI agents, and manage automated deployments using CI/CD and DevOps best practices.

• AI Security & GDPR Compliance: Implement enterprise-grade security protocols for LLMs (handling prompt injection, data leakage) and ensure strict alignment with GDPR and data privacy regulations.

• Agile Collaboration: Actively participate in Agile/Scrum sprints, translating ambitious business requirements into production-ready AI solutions.

Your Profile

Experience Requirements:

• Junior (J): 1+ year of experience working on NLP, chatbot development, or initial LLM projects.

• Medior (M): 3+ years of proven experience building and deploying generative AI pipelines, RAG systems, and integrations in production.

• Senior (S): 5+ years of extensive experience in NLP/AI engineering, architectural design of enterprise LLM agents, and leading complex AI security and scaling initiatives.

Technical Skills:

• GenAI & LLM Stack: LangChain, Python, Prompt Engineering, RAG frameworks, Vector Stores.

• NLP & Conversational Platforms: Natural Language Processing, Botpress, Rasa, or similar conversational design tooling.

• Engineering & Deployment: Full-stack development skills (Frontend & Backend), DevOps practices, CI/CD pipelines.

• Security & Governance: AI Security controls, GDPR compliance, data anonymization.

• Frameworks: Agile/Scrum methodologies.

Language Skills:

• Fluent in either Dutch (NL) or French (FR) (Minimum 3/4 - Professional Working Proficiency)

• AND Fluent in English (EN) (Minimum 3/4 - Professional Working Proficiency)

Why Smile!

• Our proximity management by peers fosters dialogue and the implementation of a tailored career path.

• Because the digital sector is in constant motion, Smile is committed to making you an expert in your field, thanks to a comprehensive training offer: access to an e-learning platform, financing of certifications, knowledge-sharing tools...

• Your year will be animated by group and agency events: annual convention, participation in trade fairs, summer party, formal & informal afterworks.

The Next Steps

1. First contact: A phone call to discuss your aspirations and what we can offer you.

2. Meeting: An opportunity to get to know each other and explore your professional background.

3. Business interview: A discussion with one of our experts to assess your skills and define your goals.