Thach Le Ngoc 0988421299 thach.le.tech@gmail.com linkedin.com/in/ngocthach1207 EDUCATION Master of Computer Science | Data Science Aug 2017 – Jun 2019 John Von Neumann Institute - VNU HCM HCM, Vietnam Bachelor of Computer Science | Computer Networking and Security Aug 2011 – Jan 2016 University of Information Technology - VNU HCM HCM, Vietnam WORK EXPERIENCE Lead AI Engineer March 2025 – Present Online Mobile Service Joint Stock Company (MoMo) HCM, Vietnam • Lifestyle Chatbot: * Build a multi-agent architecture chatbot. * Integrate restaurant, cinema, travel, and hotel tools. * Build an evaluation tool to evaluate chatbot quality for offline and online scenarios. * Serving 50.000 users/month, engagement rate 18% Data Scientist Manager Nov 2023 – Feb 2024 Vietnam Dairy Products Joint Stock Company (Vinamilk) HCM, Vietnam • Product Recommendation: * Recommend up-sell, cross-sell products for 2000 salesman and 250.000 stores. * Uplift 0.85% CTR and 0.5% CR. • Delivery Validation: * Detect the required objects to avoid fraud in the delivery process (automation 100%) * Process real-time and batch around 7.000.000 images/month. • Vinamilk Chatbot: * Answer questions about Vinamilk products and FAQs. * Answers queries about information and order status. * Serving around 21.000 conversation/month. • Face Matching: * Use API service to check in 2000 salesman. * Use the Triton server and Qdrant database to serve in real time. • Object Tracking: * Tracking customer and Vinamilk staff in GMSV stores. * Build a model to classify customers and staff. * Build a model to re-identify (grouping) a person’s images. Associate Lead Machine Learning Engineer Mar 2022 – Nov 2023 Online Mobile Service Joint Stock Company (MoMo) HCM, Vietnam • Chatbot Platform: * Build a platform to assist the product team in developing a bot to address user issues * Training and deploying bot in a few minutes, serving on high scale * Build a pipeline to monitor the bot and generate a dashboard * Build a bot can improve bank mapping flow by 15%

* Build a customer service bot achieved a 50% self-service rate Senior Machine Learning Engineer Jan 2021 – Feb 2022 Online Mobile Service Joint Stock Company (MoMo) HCM, Vietnam • FAQ Search System: * Suggest keywords when the user typing in the FAQ search service (CTR 30%) * Return search results in the FAQ search service (CTR 50%) • Spam Filter System: * Real-time spam detection in the chat system using machine learning * Dark launch with precision 96.8%, recall = 74.1% Machine Learning Engineer Jul 2018 – Dec 2020 Online Mobile Service Joint Stock Company (MoMo) HCM, Vietnam • A/B Testing System: * Simple integration, high scalability, and low latency * The product team implemented more than 100 tests in a year (2021) * Create an automated workflow to produce an analytical dashboard. • Recommendation System: * Deliver the right MoMo services and discount packages to the right users at the right time * Combine with collaborative filtering to increase user engagement and conversion rate (12%) * Build an auto pipeline to build features and get predictions hourly • Customer Churn: * Use machine learning and optimization to find top churn users needed to retain * Delivering promotion vouchers for the right users to optimize cost (save 8% promotion cost, 50% sms cost) * Build an auto pipeline to help businesses get predictions by themselves. • Feature Platform: * Organizing, and storing user features to help data scientists build models * Build data pipelines to compute user features daily * ETL data on Big Query, computed by Spark and stored on Google Cloud Storage * Easy to add more feature groups and start to train a new model Research and Development Leader Jan 2015 – Aug 2017 FPT Telecom HCM, Vietnam • Improve and expand device monitoring systems • Develop applications to automatically handle network errors • Monitor and report network infrastructure failures • Installation and maintenance of network equipment HONORS AND AWARDS 1st prize of the develop blockchain dapp hackathon Sep 2022 Vietnam Blockchain Summer School 2022 organized by VBI and UIT Student of 5 merits at VNU HCM level Jan 2016 Organized by Vietnam National University Thakral In Sewa Scholarship Jan 2016 Scholarship co-organized by Vietnam National University Encouraging Study Scholarship 2013-2015 Organized by University of Information Technology

OTHER EXPERIENCES Introduction to C++ Programming Language (Teaching Assistant - Lab) Jan 2019 Ho Chi Minh City University of Technology HCM, Vietnam Administrator of the MLOps VN (Machine Learning Operations Vietnam) May 2023 Facebook, Discord Group Vietnam Contributor, MLOps Marathon 2023 Organizing Team Jan 2023 Mlops.vn/marathon Vietnam S KILLS Languages: English (IELTS 5.5) Data science: Machine learning, NLP, Computer Vision, Recommendation, A/B testing Chatbot: LLM, LangChain, LlamaIndex, Rasa Programming: Python, Java, Kotlin, Scala Database: MySql, HBase, Big Query, Redis System: Kubernestes, Microservices, Google Cloud, AWS Cloud Others: Airflow, Celery, Kafka, Spark, Blockchain