Kliment Merzlyakov, Developer in Saint Petersburg, Russia
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Kliment Merzlyakov

Verified Expert  in Engineering

Data Scientist and Developer

Location
Saint Petersburg, Russia
Toptal Member Since
June 10, 2020

Kliment is a business-oriented data scientist with several years of industry experience. With an aspiration to make machine learning projects done without quality trade-offs, Kliment can handle any project from a business hypothesis brainstorm session to implementing a model and final integration.

Portfolio

Vigo
Data Science, Machine Learning, ClickHouse, Cassandra, Spark, Scala...
Airpush
Neural Networks, Web Scraping, Scikit-learn, Machine Learning, Data Science...
Ulmart
Web Scraping, Scikit-learn, Machine Learning, Data Science, SQL, Tableau...

Experience

Availability

Part-time

Preferred Environment

MacOS, PyCharm, Python

The most amazing...

...machine-learning result was an implementation of my preprocessing algorithm to a recommender system in the largest Russian eCommerce retailer—doubling CTR.

Work Experience

Senior Data Scientist

2020 - PRESENT
Vigo
  • Developed and integrated machine learning model to predict customer satisfaction index, which telecom operators use to optimize infrastructure expenses. Technologies used: Spark with Scala, Apache Airflow, CatBoost, Cassandra.
  • Developed and integrated machine learning model to clean up the data. There are a hundred thousand events per second sent from users and sometimes this data is wrong—the developed model filters out non-relevant data with 0.97 ROC-AUC.
  • Integrated data science technologies into the company's development pipeline: Apache Airflow, ClickHouse, Redash.
Technologies: Data Science, Machine Learning, ClickHouse, Cassandra, Spark, Scala, Apache Airflow, SQL, CatBoost

Data Scientist

2017 - 2020
Airpush
  • Developed and delivered an adult detector for apps and ad creatives which helped to keep the ad network brand safe.
  • Developed and integrated a CTR predictor, which increased revenue by 2%.
  • Integrated several Slackbots with analytics and notifications.
  • Integrated business intelligence tools Redash and Looker.
Technologies: Neural Networks, Web Scraping, Scikit-learn, Machine Learning, Data Science, SQL, Redash, Looker, ClickHouse, Generative Pre-trained Transformers (GPT), Natural Language Processing (NLP), Python

Data Scientist

2013 - 2017
Ulmart
  • Created an algorithm and also integrated it into the company’s recommender system, which increased CTR by 200%.
  • Developed and maintained ab analytical system for a net promoter score project, which was used by the KPI system.
  • Applied an LTV analysis for marketing expenses optimization.
  • Integrated Tableau and provided stakeholders with dashboards.
Technologies: Web Scraping, Scikit-learn, Machine Learning, Data Science, SQL, Tableau, BigQuery, Generative Pre-trained Transformers (GPT), Natural Language Processing (NLP), R, Python

Adult Detector at Airpush

This is an ensemble of models to predict adult content based on picture, description, and name. I collaborated with a team of Android developers to deliver the model to production. My part was to define and collect the needed data, develop a model, and integrate a Flask service. The model was successfully implemented, and the back end could obtain an adult score by request.
2017 - 2019

Master's Degree in Mathematics and Applied Statistics

Saint Petersburg State University - Saint Petersburg, Russia

2009 - 2014

Bachelor's Degree in Management

Saint Petersburg State University - Saint Petersburg, Russia

AUGUST 2022 - AUGUST 2025

AWS Certified Cloud Practitioner

Amazon Web Services

DECEMBER 2020 - DECEMBER 2021

Certified LookML Developer

Looker

Libraries/APIs

Scikit-learn, PyTorch, CatBoost

Tools

Looker, Redash, PyCharm, BigQuery, Tableau, Apache Airflow

Paradigms

Data Science

Languages

SQL, Python, R, Scala

Storage

ClickHouse, Cassandra

Platforms

Amazon Web Services (AWS)

Frameworks

Spark

Other

Machine Learning, Web Scraping, Natural Language Processing (NLP), Neural Networks, Economics, Statistics, Generative Pre-trained Transformers (GPT)

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