Postdata

Responsibilities: 
1) Consulting companies for the ability to use Machine Learning techniques to improve the quality of their businesses. Projects evaluation.
2) Build a recommendation system for the Kyiv Independent Journal. Writing news abstracts & tags are extracted for SEO optimization
3) Build a chatbot assistant for building applications based on human descriptions. The application used to work with the Node-RED backend, ToolJet front-end, and SQL database. Successfully presented the solution at the Web Summit conference. Lead a team of 5 developers. 
4) Search engine for the Austrian Economic Chamber website.
5) Build a chatbot for personal assistance. Resolve Multi-Hop reasoning problem. Improve the quality of chatbot answers. 
6) Business clients' analytics for Vodacom in South Africa
7) Business clients' analytics for Etisalat in Emirates.
8) Build a scoring model for MDFinance. Achieved AUC of approximately 70% and showed the best performance metrics among the other contractors contacted by the company.
9) Building delivery system for clients. Resolve Vehicle Routing Problems with different business restrictions for the client. 
10) Building a 3D reconstruction system for creating a 3D model of the building based on a subset of photos of this building
11) Build an application for social media influencers.

Data Science Consultant

Responsibilities:
1) Released new ranking models in Kazakhstan, Ukraine, Uzbekistan and Romania for OLX-Group.
2) Causal revenue analysis of the new model releases in OLX. 
3)Build a multi-objective ranking system for OLX-Group. Improve the NDCG metrics for visitors' experience and promoted products.
4) Personalized recommendations for users in Poland

Grid Dynamics

Technologies: Python, SQL, Generative AI, Time-series forecasting, Prophet, SARIMA, ControlNet, Stable Diffusion, GCP.
Sectors: Consultancy, Retail, Financial Industry

Responsibilities: 
1) Helped with discoveries and pre-sales for Grid Dynamics clients.
2) Building complaint prediction and churn detection models for PayPal. Leading a team of 3 Data Scientists, 1 Python Developer, and 1 DevOps on a PayPal account
3) Build traffic forecast models for Ralph Lauren's stores. 
4) Generate a furniture design based on scratch images.

Lead Data Scientist

Technologies: Python, Ranking, SQL, Computer Vision, Tensorflow, Recommendation systems,  RankNet, GCP.
Sectors: Consultancy, e-commerce

Responsibilities: 
1) Creating a video-processing system for detecting percentage of gender, races, e.t.c in videos. Technologies: OpenCV, Tensorflow
Ranking system for Macy's. Increase NDSG metrics by adding information about UPC variability.
2) Build demand forecasting pipeline.
3) Visual search for Macy's
4) Build a search engine for Macy's.  Technologies: Ranking Systems, LambdaRank

Senior Data Scientist

The APP Solutions

Main task:
1) Communicate with customers. Projects evaluation. 
2) Managing a teams for building MVP
3) Build YOLO system for clothes detection and clothes recommendation by users photos

Ninety Percent of Everything

90 Percent of Everything is a British company with a goal to revolutionise shipping by creating a suite of comprehensive software solutions for the Maritime industry. It creating a lot of different technologies that includes from global vessel tracking to vessel performance analysis, crew optimization and so much more

Technologies: Python, Git, Flask, PostgreSQL, Docker, Databricks 

Responsibilities: 

1) Creating system for crew optimization  using information about persons experience, ticket prices and vessels requirements   
2) Creating pathfinding system for vessels using information about weather, distances, bathymetrical data e.t.с. Implementing from scratch A*, Post Smoothing, HPA*, BasicTheta*, LazyTheta* for spherical geometry
3) Calculating force with which water acts on a vessel depends from sensor indicators 
4) Prediction of fuel consumption on a ship

Data Scientist

MD Finance (Int)

Outsource project.
Main task: End-to-end outsource project for creating scoring system for Romania and creating REST API for this system.

Data Science Consultant 

Київстар

Kyvstar is the biggest telecom company in Ukraine. Kyivstar is part of the international telecom group VEON (Netherlands). Operator services are used by 26 million subscribers. Also it is one of the largest internet broadband providers. The company's mobile network covers all cities of Ukraine, as well as more than 28 thousand rural settlements, all major national and regional highways, most of the sea and river coasts.

Technologies: Python, PL/SQL, R (Shiny) , Hive

Responsibilities: 

1) Create scoring systems
2) Find lookalike audiences for customer (PU-learning)
3) B2B clients resegmentation
4) Antifraud systems for bank
5) Development of models for finding new customers and upsell existing users for mobile TV service from Kyivstar
6) Building heatmaps for setting up new outlets, 
7) Prediction client revenue 
8) Deleting personal information from dialogs (Name Entity Recognition task)
9) Creating a customer portrait for specific product
10) A/B testing

DataRoot Labs

Project:
Was working on a Bookimed project. Bookimed is the popular Ukraine platform for the selection of the best clinics and treatment organizations in the world. About 300,000 users from different countries visit it every month. The company mission is to help each of them find the best solution to their medical problem.

Technologies: Python, MongoDB, MySQL, Git

Responsibilities: 

1) Segmentation of web users
2) Developing a model for recommending similar web pages
3) Development of the recommendation system for managers
4) Automatic search of key questions in the texts
5) Text segmentation

Technologies: Python
Responsibilities: 
-Implemented from scratch: linear regression, logistic regression, Naive Bayes, ICA, SVM,  PCA
-Emotion recognition from speech

Data Science Trainee

BNP Paribas

UKRSIBBANK BNP Paribas Group is a commercial bank based in Ukraine.  It operates a network of 300 branches and 1000 ATMs throughout Ukraine, for 1.9 million customers all around Ukraine, 165,000 SME's companies and 2,200 large corporate companies.

Technologies: PL/SQL, Excel

Responsibilities: 
     -Financial analysis
     -Management reporting
-Calculation profitability of projects

Data Analyst

My name is Andrii Rohovyi.  I am Data Science Consultant from Ukraine with 8 years of expertise in Data Science and 9 years in Data Analysis. I am specializing in cutting-edge AI techniques and have successfully supported companies across diverse sectors, including telecom, maritime, logistics, financial industries, e-commerce, and retail. With a proven track record, I have built consultancies for prominent clients such as PayPal, BNP Paribas, Ralph Lauren, Macy's, Veon, OLX Group and Vodafone, as well as innovative start-ups. My technical proficiency spans various technologies, including Chatbots, Recommendation & Ranking Systems, Scoring, Predictive Analytics, Linear Optimization, Computer Vision, and Generative AI. My passion extends to pathfinding systems for robotics, collaborating with leading professors in the field. Over my career, I have consistently delivered measurable achievements in my projects.

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