Senior AI Specialist | NexGen
NVIDIA GTC
As a Senior AI Specialist at NexGen Cloud, I had the privilege of presenting our work on Large Language Models (LLMs) and GPU optimization at one of the world's largest AI conferences.
Projects
Highlighted projects
Director of AI | NexGen Cloud
Hyperstack AI Studio
Led the development and implementation of an end-to-end Generative AI platform for building, fine-tuning, and deploying custom AI models.
Other projects
Freelance Python Developer
Programming tutor
Contributed to a coding bootcamp (Status200) designed for students with a migration background to build tech skills and transition into tech careers.
Freelance Gen AI Specialist
Gen AI Model Trends
Wrote a Medium article on the latest Gen AI model trends in December 2025: MoE models, quantiziation, and long context windows
Freelance Gen AI Specialist
Fine-tune LLMs tutorial
Wrote a comprehensive tutorial on Medium about fine-tuning an LLM, from data generation to hosting a chatbot online.
Freelance Gen AI Specialist
Evaluating LLMs
Wrote a comprehensive tutorial on Medium about evaluation LLMs, from including theory and practical application.
Freelance Gen AI Specialist
Large Language Models
Deployed open-source Large Language Models on AWS Sagemaker and improved outputs with Retrieval Augmented Generation (RAG) techniques.
Freelance Gen AI Specialist
Common LLM mistakes
Wrote a Medium article on common mistakes in local LLM deployment with specific solutions and examples using Ollama
Reviews
Reviews
Sebastian is a great freelancer and was key to the success of this project
Sebastian was very knowledgable in Large Language Models / AI. He was extremely professional, quick [..] and his communication was very impressive. He’ll be our “go to” “LLM / AI guy” from now on.
[Sebastian] demonstrated professionalism, dedication, and put in significant effort to deliver quality work [and was] attentive to details and showed a strong understanding of the task at hand [..]
Great work! [Sebastian] solved a very difficult problem quickly and efficiently. Would hire again!
Tools & Technology
Tools & Technology
Generative AI, Large Language Models, Natural Language Processing, Computer Vision
Machine Learning, MLOps, Forecasting / Predictive Analytics, MLOps, CI/CD
Azure, Google Cloud Platform, AWS, Databricks
Neural Networks, Transformer Models, Random Forest, XGBoost, Regression Analysis, SARIMA
Python, Javascript, Java, R
PySpark, TensorFlow, Pytorch, Scikit-learn, Langchain, OpenAI API, Spacy, NLTK, OpenCV, Yolo