Kliment Merzlyakov
Verified Expert in Engineering
Data Scientist and Developer
Mexico City, Mexico
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 brainstorming session to implementing a model and final integration.
Portfolio
Experience
- Python - 8 years
- Machine Learning - 6 years
- SQL - 6 years
- Data Science - 6 years
- Web Scraping - 4 years
- Natural Language Processing (NLP) - 3 years
- Neural Networks - 3 years
- Generative Pre-trained Transformers (GPT) - 3 years
Preferred Environment
MacOS, PyCharm, Python
The most amazing...
...machine learning result was the implementation of my preprocessing algorithm in a recommender system in the largest Russian eCommerce retailer, doubling CTR.
Work Experience
Senior Analytics Engineer
Plytrix Analytics
- Led a three-engineer team to develop a robust data integration solution. Designed and implemented processes for ingesting data from 100+ sources. Orchestrated the creation of 300+ dbt models and 700+ data validation tests.
- Decreased the average win-back communication period from 66 to 42 days by integrating a machine learning churn and LTV model using Google Cloud Functions.
- Reduced miscommunication between business units by creating unified LookML and dbt layers. Implemented Looker Explores with GCP, Fivetran, dbt, and Snowflake. Shrank data discrepancy from 4% to 0.3%.
Senior Data Scientist
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.
Data Scientist
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.
Data Scientist
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.
Experience
Adult Detector at Airpush
Education
Master's Degree in Mathematics and Applied Statistics
Saint Petersburg State University - Saint Petersburg, Russia
Bachelor's Degree in Management
Saint Petersburg State University - Saint Petersburg, Russia
Certifications
AWS Certified Cloud Practitioner
Amazon Web Services
Certified LookML Developer
Looker
Skills
Libraries/APIs
Scikit-learn, Pandas, PyTorch, CatBoost
Tools
Looker, Redash, PyCharm, BigQuery, Tableau, Apache Airflow, dbt Cloud, Microsoft Power BI, Superset
Languages
Python, SQL, Looker Modeling Language (LookML), R, Scala, Snowflake
Paradigms
Business Intelligence (BI), ETL
Storage
ClickHouse, Cassandra
Frameworks
Spark, Streamlit
Platforms
Amazon Web Services (AWS), Databricks, Google Cloud Platform (GCP)
Other
Data Science, Business to Business (B2B), Data Visualization, Machine Learning, Web Scraping, Looker Studio, Linear Regression, Natural Language Processing (NLP), Neural Networks, Economics, Statistics, Generative Pre-trained Transformers (GPT), Data Build Tool (dbt), Fivetran, Churn Analysis, Consumer Behavior, Data Analytics (Marketing), Marketing Analytics, Data Engineering, Bayesian Statistics
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring