Henrik Sergoyan, Developer in Munich, Bavaria, Germany
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Henrik Sergoyan

Verified Expert  in Engineering

Data Scientist and Machine Learning Developer

Location
Munich, Bavaria, Germany
Toptal Member Since
November 5, 2021

Henrik is a data scientist with over six years of professional experience. His primary expertise includes and is not limited to natural language processing, forecasting algorithms, gradient boosting algorithms for tabular data, data scraping, and machine learning operations (MLOps). As a senior data scientist, Henrik works with SQL and NoSQL databases, including MongoDB, and brings strong project management skills and excellence to his work.

Portfolio

Toptal Client
Python, Data Science, MongoDB, Jupyter Notebook, ETL, Data Visualization...
Station Casinos LLC - Main
Machine Learning, SQL, Python, Linux, RapidMiner, Windows...
Fozzy Group
Python, PyCharm, MySQL, Time Series Analysis...

Experience

Availability

Part-time

Preferred Environment

Windows, MacOS, Slack, PyCharm, Jupyter Notebook, Visual Studio Code (VS Code)

The most amazing...

...thing I've developed is an end-to-end data science pipeline for two different platforms used by the Armenian government.

Work Experience

Senior Data Science Consultant

2022 - 2022
Toptal Client
  • Developed compound Aggregation pipelines in MongoDB to process a large number of nested documents in a given collection.
  • Created a system that identifies bugs in the data processing stage where structured information was derived from PDF reportings of charity organizations. With the help of my system, we could detect and fix all inconsistencies in the database.
  • Created a user-friendly Streamlit dashboard (MVP) that serves as a user's charity navigator. I've developed interactive visualization (Sankey diagram) for each charity that shows the flow of money (from revenue to expenses) across the year.
Technologies: Python, Data Science, MongoDB, Jupyter Notebook, ETL, Data Visualization, Streamlit, Data, Data Analysis, API Integration, Analytics, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis

Machine Learning Expert

2021 - 2022
Station Casinos LLC - Main
  • Developed a system that identifies customers who are going to leave the building (in the 15-minute interval), taking into account 42 variables that describe the past and current behavior of the client.
  • Developed complex SQL queries that pulled real-time data from SQL databases.
  • Deployed the chance of leaving the model in production using RapidMiner.
Technologies: Machine Learning, SQL, Python, Linux, RapidMiner, Windows, Gradient Boosted Trees, Deep Learning, Deep Neural Networks, Predictive Learning, Data, Data Analysis, API Integration, Data Science, Analytics, NoSQL, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis

Senior Data Scientist

2021 - 2021
Fozzy Group
  • Created and implemented sales forecasting models for promotional products.
  • Deployed a promotional forecasting model and implemented a monitoring system for that model.
  • Assisted in improving the recommender system of the Ukrainian biggest grocery stores, including feature engineering and modeling.
  • Created a Power BI dashboard for sales forecasting models to analyze errors.
  • Led the model deployment by communicating with relevant stakeholders to identify business needs, create system architecture, and assist the back-end team in deploying our model in a most optimized way.
Technologies: Python, PyCharm, MySQL, Time Series Analysis, Machine Learning Operations (MLOps), Recommendation Systems, Microsoft Power BI, LightGBM, CatBoost, XGBoost, Graylog, RabbitMQ, Flask, REST, Windows, Slack, Jupyter Notebook, Data Mining, Data Engineering, SQL, ETL, Machine Learning, Artificial Intelligence (AI), Data Science Product Manager, Azure SQL, Ensemble Methods, BERT, TensorFlow, Data Science, Deep Learning, Keras, Statistics, PySpark, Amazon Web Services (AWS), Dashboards, RStudio Shiny, Tableau, Predictive Learning, Gradient Boosted Trees, Reporting, Data Analytics, Data Analysis, Data Reporting, Web Scraping, Time Series, BigQuery, Statistical Analysis, Model Development, Pandas, PyTorch, Software Engineering, Mathematics, Data Visualization, Source Code Review, Task Analysis, Interviewing, Data, API Integration, Predictive Analytics, Analytics, NoSQL, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis, NumPy

Senior Data Science Consultant

2019 - 2021
Armenia National SDG Innovation Lab | UNDP Office
  • Developed a first-ever AI-powered real-time tool travelinsights.ai for data analytics that uses artificial intelligence to collect, analyze, and visualize tourist reviews about Armenia from Tripadvisor, Facebook, and Booking.com.
  • Created a real-time platform Edu2Work to scrape over 60,000 online job postings, extract and standardize relevant information from the unstructured job descriptions, and present the analysis in a dashboard.
  • Developed a data science portion of a monitoring platform sdglab.am/en/projects to monitor Armenian Sustainable Development Goals (SDGs). This is a user-friendly, AI-powered, open-access interactive online tool for data analytics.
  • Built a citizen request classification model to increase the Armenian government's operational efficiency, assigning requests made by Armenian citizens to the corresponding ministries and departments.
  • Managed a data science team. Participated in project planning from an initial stage, developed a work breakdown structure (WBS) for each task, and managed communication between the data science team and the lab executives.
Technologies: Python, GPT, Generative Pre-trained Transformers (GPT), Natural Language Processing (NLP), TensorFlow, Google Cloud, BERT, Transformers, Zero-shot Learning, Few-shot Learning, Word2Vec, Clustering, GRAPH, FbProphet, CATS Forecasting, Ensemble Methods, Data Scraping, ETL, MongoDB, Selenium, Social Media APIs, Project Design, Design Thinking, Agile Project Management, Windows, MacOS, Slack, PyCharm, Jupyter Notebook, Data Mining, Unsupervised Learning, Data Engineering, Machine Learning Operations (MLOps), Machine Learning, Artificial Intelligence (AI), Data Science Product Manager, Data Science, Named-entity Recognition (NER), Deep Learning, Keras, Scikit-learn, Dashboards, RStudio Shiny, Linux, Predictive Learning, Gradient Boosted Trees, Deep Neural Networks, Reporting, Data Analytics, Google Cloud Platform (GCP), Data Analysis, Data Reporting, Web Scraping, Time Series, Statistical Analysis, Model Development, Pandas, PyTorch, Software Engineering, Mathematics, Data Visualization, Technical Hiring, Code Review, Source Code Review, Task Analysis, Interviewing, Team Management, Data, API Integration, Predictive Analytics, Office 365, Analytics, NoSQL, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis, NumPy

Teaching Associate

2019 - 2020
American University of Armenia
  • Supervised a team of senior students for their Capstone project focusing on real estate market analytics in Armenia. Developed models for data extraction, interior design classification, distance calculation, and most optimal price estimation.
  • Conducted weekly problem-solving sessions with 20 BSc and MSc students for the Statistics course. Explained solutions for a unique set of problems based on discussed topics.
  • Assisted in creating the syllabus and agenda for the Natural Language Processing and Statistics courses.
  • Supervised students for their Capstone projects, some related to the real estate market and news analytics.
Technologies: Statistics, Bayesian Statistics, Natural Language Processing (NLP), GPT, Generative Pre-trained Transformers (GPT), University Teaching, Supervisor, Real Estate, Web Scraping, Data Collection, BigQuery, Statistical Analysis, PyTorch, Mathematics, Technical Hiring, Code Review, Task Analysis, Interviewing, Data, GIS, RStudio, Predictive Analytics, Office 365, Sports, Data Science, Analytics, NoSQL, Database Management, Statistical Programming, Sentiment Analysis, NumPy

Data Scientist

2018 - 2019
Ameriabank
  • Created and deployed an AI-based virtual assistant for the bank's employees. Reduced the operational efficiency of the bank's internal communications by 120%.
  • Developed forecasting algorithms for financial market indicators, commodities, prices, and sales.
  • Performed customer segmentation analysis based on their transactions and activity.
Technologies: Python, SQL, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), GPT, Windows, Slack, PyCharm, Jupyter Notebook, Data Mining, Data Scraping, Unsupervised Learning, Data Engineering, ETL, Machine Learning, Artificial Intelligence (AI), Ensemble Methods, Zero-shot Learning, BERT, TensorFlow, Google Cloud ML, Data Science, Named-entity Recognition (NER), Statistics, Bayesian Statistics, Scikit-learn, Dashboards, RStudio Shiny, Linux, Predictive Learning, Gradient Boosted Trees, Reporting, Data Analytics, Google Cloud Platform (GCP), Sports, Data Analysis, Data Reporting, Web Scraping, Data Collection, Time Series, Statistical Analysis, Model Development, Pandas, Mathematics, Data Visualization, Code Review, Source Code Review, Task Analysis, Team Management, RStudio, Predictive Analytics, Office 365, Analytics, NoSQL, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis, NumPy

Data Scientist | Statistician

2017 - 2018
ClinChoice
  • Recognized inconsistencies in datasets while preparing SAS programs before a database lock.
  • Developed the SAS programs to produce tables, listings, and graphs according to the specifications indicated in the statistical analysis plan (SAP).
  • Created, validated, and documented the SAS programs by good clinical programming practices and according to applicable guidelines and the client's standard operating procedures.
Technologies: SAS, SAS SQL, Windows, Slack, Data Mining, ETL, Ensemble Methods, BERT, Bayesian Statistics, R, Predictive Learning, Reporting, Data Analytics, Data Analysis, Data Reporting, Web Scraping, Data Collection, Statistical Analysis, Pandas, RStudio, Predictive Analytics, Office 365, NoSQL, Database Management, Statistical Programming, Statistical Modeling, Sentiment Analysis, NumPy

Labor Market Intelligence Platform | Edu2Work

https://edu2work.am/
The Edu2Work platform was developed in response to the dynamic nature of the labor market and the ongoing mismatch between the demand and supply of talent in Armenia. The platform employs cutting-edge natural language processing (NLP) models to gather and analyze thousands of online job postings from a range of commercial websites. By doing so, it provides comprehensive, up-to-date data on the Armenian labor market, empowering individuals to make informed career decisions.
The development of Edu2Work involved the design and implementation of an end-to-end data science pipeline, encompassing efficient and flexible data ingestion, information extraction and standardization, and data visualization. Core NLP tasks performed during the project included job title standardization according to European standards, industry classification, skill extraction and classification (soft/hard), and degree extraction (BSc, MSc, PhD, None). These tasks were instrumental in enabling the platform to provide high-quality labor market data in a user-friendly and accessible format.

Promotional Forecasting

In this project, I've developed an end-to-end pipeline for forecasting the sales model of promotional products in the largest retail stores in Ukraine. The model considers over 30 features to accurately predict the sales of products planned to be in a promotion. After being deployed internally, the model has increased the operational efficiency of the commerce team deciding on the type and amount of promotion, and the logistics team, allocating sufficient resources in each branch.

Tourism Analytics Platform

https://www.travelinsights.ai/
I developed an AI-powered real-time data analytics tool for the tourism sector in Armenia. The online tool uses travel storytelling and artificial intelligence to collect, analyze, and visualize tourist reviews about Armenia from Tripadvisor, Facebook, and Booking.com. Through real-time analysis and visualization of the tourist reviews, the tool reveals actual travel preferences and on-the-ground issues in Armenia. With one scroll, policymakers, businesses, or tourists can explore insights from all over the world about different regions and locations of Armenia.

Languages

Python, R, SQL, SAS

Frameworks

LightGBM, Selenium, RStudio Shiny, Flask, Streamlit

Libraries/APIs

CatBoost, XGBoost, Pandas, NumPy, TensorFlow, Keras, Scikit-learn, PyTorch, Social Media APIs, PySpark

Tools

Slack, PyCharm, Named-entity Recognition (NER), Visual Studio, Tableau, BigQuery, GIS, Microsoft Power BI, Graylog, RabbitMQ, Supervisor, AutoML

Paradigms

ETL, Data Science, Design Thinking, Agile Project Management, REST, Automation

Platforms

MacOS, Jupyter Notebook, RStudio, Windows, Linux, Azure, Amazon Web Services (AWS), Google Cloud Platform (GCP), Visual Studio Code (VS Code), RapidMiner

Storage

Database Management, MongoDB, MySQL, Google Cloud, SAS SQL, NoSQL, Azure SQL

Other

Data Mining, Data Scraping, Natural Language Processing (NLP), Word2Vec, FbProphet, Ensemble Methods, Machine Learning, Artificial Intelligence (AI), Deep Learning, Statistics, Dashboards, Gradient Boosted Trees, Reporting, Data Analytics, Fantasy Sports, Data Analysis, Data Reporting, Web Scraping, Data Collection, Time Series, Statistical Analysis, Model Development, Mathematics, Data Visualization, Task Analysis, Interviewing, Data, Predictive Analytics, Sports, Football, Analytics, Statistical Programming, Statistical Modeling, Sentiment Analysis, GPT, Generative Pre-trained Transformers (GPT), Unsupervised Learning, Data Engineering, Computational Statistics, Machine Learning Operations (MLOps), Dash, Time Series Analysis, BERT, Transformers, Zero-shot Learning, Few-shot Learning, Project Design, Data Science Product Manager, Bayesian Statistics, Predictive Learning, Deep Neural Networks, University Teaching, Real Estate, Technical Hiring, Code Review, Source Code Review, Team Management, API Integration, Office 365, Google Cloud ML, Recommendation Systems, CATS Forecasting, Software Engineering, Agile Data Science, Graphs, Clustering, GRAPH

2022 - 2022

Ph.D. Degree in Data Science

European University of Armenia - Yerevan

2020 - 2022

Master's Degree in Mathematics in Data Science

Technical University of Munich - Munich, Germany

2019 - 2021

Master's Degree in Statistics

Yerevan State University - Yerevan

2015 - 2019

Bachelor's Degree in Computer Science

American University of Armenia - Yerevan, Armenia

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