Hotel support assistant
A conversational assistant that helps hotel guests with common questions and support requests through natural language.
- Python
- LLMs
- Chatbots
- NLP
NLP Engineer | Computational Linguist
Nikos Vasilopoulos
I build language driven AI, from retrieval augmented chatbots and speech pipelines to sentiment models and embeddings.
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About
I'm a computational linguist working across language and machine learning. My work focuses on natural language processing, large language models, retrieval augmented generation (RAG), embeddings, and speech technologies.
I enjoy turning linguistic problems into practical AI applications: building chatbots that reason over real documents, transcription pipelines for speech to text, and models that understand sentiment and meaning at scale.
I care about clean, understandable solutions and about the linguistic detail that makes language systems actually work well.
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Featured Projects
Greek History RAG Chatbot
A retrieval augmented chatbot that answers questions about Greek history by grounding an LLM in a curated document collection for accurate, source based responses.
- Python
- LLMs
- RAG
- Embeddings
- Streamlit
AI Healthcare QA Evaluator
An AI assistant that answers questions and evaluates responses for quality and accuracy using language models.
- Python
- LLMs
- NLP
- Streamlit
Audio Transcriber
A speech to text application that converts audio recordings into accurate transcripts, built around modern automatic speech recognition models.
- Python
- Speech to Text
- Hugging Face
- Streamlit
Sentiment Analysis Project
A comparative sentiment classification project fine tuning transformer models to detect positive and negative sentiment in text.
- Python
- BERT
- DistilBERT
- Hugging Face
- NLP
SQL Amazon Review Sentiment Explorer
An interactive explorer that combines SQL querying with sentiment analysis to surface insights from Amazon product reviews.
- Python
- SQL
- NLP
- Streamlit
Word2Vec Friends Dialogues
A word embeddings project trained on Friends TV show dialogues to explore semantic relationships and word similarities in conversational language.
- Python
- Word2Vec
- Embeddings
- NLP
Travel Chatbot Rasa
A conversational travel assistant built with the Rasa framework, handling intents, entities, and dialogue flows for trip related queries.
- Python
- Rasa
- NLU
- Chatbots
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Skills
- Python
- NLP
- LLMs
- RAG
- Embeddings
- Hugging Face
- Streamlit
- GitHub
- SQL basics
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Experience
Profile Software
AI Language Data Annotator, Speech to Text Systems
Annotated and validated language data to train and improve speech to text systems, ensuring high quality datasets for ASR models.
Wolt
Support Associate
Provided customer and operational support, resolving issues efficiently while maintaining a high standard of service.
Self employed
Private Tutor
Taught language and study skills to students, tailoring explanations to individual learning needs.
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Education
National and Kapodistrian University of Athens
2024 to Expected 2026
MSc in Language Technology (NLP)
University of the Peloponnese
2021 to 2023
MA in Modern Greek Language and Literature
University of the Peloponnese
2014 to 2021
BA in Greek Language and Literature
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Contact
I'm always happy to talk about NLP, AI, and language technology. Feel free to reach out.