German Borysevich
Verified Expert in Engineering
Product Analyst and Developer
Gdansk, Poland
Toptal member since September 1, 2026
German is a lead product analyst with five years of experience building analytics and business intelligence solutions for clients, including Azur Games, Appsyoulove, and EPAM Systems. His primary expertise is in Python, SQL, and BI tools for the gaming and technology industries, where he thrives in mentoring teams and building internal AI agents. German increased D7 retention by 17% and ARPU by 22% while at Appsyoulove.
Portfolio
Experience
- Python - 6 years
- Machine Learning - 5 years
- SQL - 5 years
- A/B Testing - 5 years
- Docker - 2 years
- Tableau - 2 years
- AI Engineering - 1 year
- Model Context Protocol (MCP) - 1 year
Preferred Environment
Tableau, Apache Superset, A/B Testing, Python, SQL, Machine Learning, Claude, ClickHouse, LangChain, LangGraph
The most amazing...
...AI agent I've built is an internal toolkit that helps analysts write, review, and validate analytics code, shipped to the team via a plugin marketplace.
Work Experience
Lead Product Analyst
Azur Games
- Built an internal AI agent that helps analysts write, review, and validate analytics code, including ClickHouse SQL, Zeppelin notebooks, and BI dashboards.
- Developed supporting MCP servers in-house and shipped the toolkit to the team via a plugin marketplace with a curated, self-correcting knowledge base.
- Conducted research on current in-game mechanics to offer new ones or suggest improvements.
- Hired, interviewed, and mentored new product analysts.
- Evaluated the effect of new features on users' behavior and the project's monetization.
- Assisted game designers with calculating and improving the balance of features.
- Found abuse mechanics, built metrics to monitor them, and offered solutions to eliminate them.
- Performed code cross-reviews of other analysts' work.
Senior Product Analyst
Replika
- Built pipelines to export data from different APIs into the BI system.
- Set up the full A/B testing process, including hypothesis formulation, experimental design, and analysis.
- Built dashboards for custom and regular monitoring.
- Interviewed, hired, and mentored new product analysts.
- Drafted technical requirements for in-game analytical events.
- Analyzed metrics specific to AI chatbots such as length of conversation, number of conversations, and conversation feedback.
Senior Product Analyst
Appsyoulove
- Developed a Bayesian A/B testing tool for automated analysis of new features.
- Performed advanced statistical modeling using frequentist and Bayesian statistics.
- Organized ETL processes to ingest data from S3 to our ClickHouse cluster.
- Mentored new product analysts by onboarding them on the specifics of the company's data, advising on approaches for task completion, and conducting code reviews.
- Optimized games' difficulty and economy with statistical methods.
- Communicated with product management, marketing, and UA by proposing new features for tests, reporting test results, and advising on which variant to deploy.
- Contributed to new features that led to an increase in D7 retention by 17% and ARPU by 22%.
Marketing Data Analyst
Playgendary
- Calculated LTV and improved its forecast accuracy using machine learning.
- Provided consultation to marketing and UA departments.
- Developed and maintained regular and custom Tableau dashboards.
- Conducted A/B testing of advertising campaigns, including hypothesis formulation, experiment design, and analysis.
Financial Revenue Analyst
EPAM Systems
- Recognized revenue according to international standards such as IFRS/US GAAP.
- Forecasted revenue and performed business modeling manually and with specific company tools.
- Calculated monthly revenue for different types of projects.
- Analyzed projects' financial status and found ways to improve it.
- Assisted with drafting financial terms and budgeting in contracts.
- Built processes on accounts (clients) and provided consulting and support services to the project team.
- Collaborated with subcontractors, clients, and internal staff, including active oral and written communication in English.
Experience
Apache Zeppelin MCP Server
https://github.com/german-borisevich/apache-zeppelin-mcpEducation
Master's Degree in Economics
Belarusian State Economic University - Minsk, Belarus
Bachelor's Degree in Economics
Belarusian State Economic University - Minsk, Belarus
Skills
Libraries/APIs
Pandas, NumPy
Tools
StatsModels, Claude, Microsoft Excel, Tableau, BigQuery, Amazon Athena, Jenkins, Apache Zeppelin
Languages
Python, SQL
Paradigms
Model Context Protocol (MCP)
Storage
ClickHouse
Platforms
Docker
Frameworks
LangGraph
Other
Statistical modelling, A/B Testing, Dashboards, Machine Learning, Statistics, Bayesian Statistics, Apache Superset, Amplitude, Deep Learning, People Management, AI Engineering, Data Build Tool (dbt), Financials, Revenue Recognition, LangChain, Business English, International Affairs, AI Agents
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