Ömer Gözüaçık
Verified Expert in Engineering
Data Scientist and Developer
Ankara, Turkey
Toptal member since July 9, 2026
Ömer is a team lead in data science with 7 years of experience in machine learning (ML) and LLM systems for clients like Deel, OneByZero, and Unscrambl. His primary expertise is in AWS, Docker, and Kubernetes for technology and AI-driven industries, where he thrives in cloud-based environments. Ömer directed the development of an AI-powered assistant that achieved an 80% deflection rate and drove $10 million in annual savings while at Deel.
Portfolio
Experience
- AI Research - 10 years
- Python - 9 years
- Git - 9 years
- Machine Learning - 9 years
- Natural Language Processing (NLP) - 6 years
- Amazon Web Services (AWS) - 5 years
- PyTorch - 5 years
- LangGraph - 2 years
Preferred Environment
Amazon Web Services (AWS), Docker, Kubernetes, Apache Airflow, MLflow, Spark, PostgreSQL, Neo4j, Git, Grafana
The most amazing...
...AI system I've built is Deel Support Chat, which achieved an 80% deflection rate and drove $10 million in annual savings by reducing support headcount.
Work Experience
Team Lead, Data Science
Deel
- Promoted twice within 2 years to senior engineer in June 2024 and team lead in August 2025. Expanded the AI/ML team from 2 to 10 engineers and co-led over 50 interviews.
- Led the development of Deel Support Chat, a vendor-independent AI-powered assistant achieving an 80% deflection rate across emails and chats. Reduced support headcount from 400 to 200 (projected 150), driving estimated $10 million in annual savings.
- Integrated open-source LLMs into production via vLLM. Benchmarked and deployed quantized models to optimize GPU and memory usage at scale.
- Built browser automation tooling to handle JavaScript-heavy interfaces, enabling AI to provide enhanced contextual guidance and improve user navigation.
- Built AISAT, an automated scoring system rating customer interactions across 4 quality criteria.
- Led root cause identification, an ML-based classifier to detect and route support escalations to the right teams.
- Contributed to Deel AI, a vendor-independent LLM-powered chatbot by enhancing the RAG pipeline, achieving satisfaction scores of 3.4 out of 4, building conversational RAG agents, and refactoring the API for scalability and A/B testing.
Data Scientist
OneByZero
- Developed customer segmentation and uplift models, raising ARPU by 2.7% and take-up rate by 3.1%.
- Delivered explainability reports with actionable insights for the business team.
- Improved the scalability of the existing ML service.
ML Engineer
Unscrambl
- Built end-to-end ML and NLG solutions for QBO, a conversational analytics platform. Implemented clustering, correlation analysis, association rules, automated narratives, page flow analytics, and SQL query explanations.
- Engineered the foundation of the analytics back end used in all analytics solutions, collaborating with team members.
- Designed an end-to-end architecture to fetch, process, and generate insights that are easily understood by business users.
Research and Teaching Assistant
Bilkent University
- Assisted in research for the TÜBİTAK project, Online Classification of Evolving Multi-source Data Streams in Big Data Environments (117E870).
- Assisted in teaching CS 101 and CS 224, handling labs, interviews, and grading, as well as grading for graduate-level courses CS 527 and CS 528.
- Published 2 research papers on concept drift detection.
Experience
Discriminative Drift Detector for Concept Drift Detection
https://github.com/ogozuacik/d3-discriminative-drift-detector-concept-driftEducation
Master's Degree in Computer Engineering
Bilkent University - Ankara, Türkiye
Bachelor's Degree in Electrical and Electronics Engineering
Bilkent University - Ankara, Türkiye
Certifications
AWS Certified Machine Learning - Specialty
AWS
AWS Certified Cloud Practitioner
AWS
Deep Learning Specialization
Coursera
Machine Learning
Coursera
Skills
Libraries/APIs
Claude API, PyTorch, XGBoost, vLLM, NetworkX, Pandas, Scikit-learn, TensorFlow, CatBoost, NumPy
Tools
Claude, Git, Amazon SageMaker, Apache Airflow, Grafana, MATLAB
Languages
Python, TypeScript, SQL, Java, JavaScript
Frameworks
LangGraph, LightGBM, Spark
Platforms
Amazon Web Services (AWS), Docker, Kubernetes
Storage
Amazon S3 (AWS S3), PostgreSQL, Neo4j, MongoDB, ClickHouse
Other
Machine Learning, Large Language Models (LLMs), Artificial Intelligence (AI), Retrieval-augmented Generation (RAG), Generative Artificial Intelligence (GenAI), Prompt Engineering, LiteLLM, MLflow, Natural Language Processing (NLP), AI Research, Deep Learning, Machine Learning Operations (MLOps), LangChain, EC2, Qdrant, Weaviate, FAISS, Prometheus, University Teaching, Software Engineering, Electrical Engineering, Medical Imaging, Networks
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