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NikitaBoyarkin/README.md

Nikita Boyarkin — Data / Product Analyst. Ambiguous product questions turned into clean experiments, SQL pipelines, and decisions.

📦 Portfolio: Portfolio
🔗 Links: Links

KYC A/B: +5.72 pp conversion (case study) · €656K annualized impact · 27 projects, each with a public case study

📚 Currently

  • 📚 Learning: Bayesian A/B testing, ClickHouse
  • 💼 Open to: BI / product / data analyst roles — actively interviewing
  • 🤝 Collab: experimentation, user retention analytics
  • 🚧 Building: interactive analyst portfolio — playable SVG games + self-hosted GitHub stats

🗂️ All Projects

Portfolio overview: 27 projects across 4 tracks plus 23 Volta Neobank case studies

27 projects across 4 tracks · 23 Volta case studies

1. A/B Testing Methodology Toolkit — Experiments

Repo Stars Case study

Stack: Python NumPy / SciPy pytest uv

2. Browser Mini-Games — Analytics Arcade — Experiments

Repo Stars Case study

Stack: SVG JavaScript Astro Playwright

3. Causal / Uplift — CUPED and Individual Treatment Effects — Experiments

Repo Stars Case study

Stack: Python LightGBM scikit-learn pandas / NumPy

4. CRM Experiment Lab — Segment-Stage Randomization, GCG and Net Effect — Experiments

Repo Stars Case study

Stack: Python pandas / NumPy SciPy statsmodels

5. Data Analyst Telegram Bot — Experiments

Case study · private

Stack: Python aiogram pandas SciPy / statsmodels

6. Volta Neobank — Product Analytics — Experiments

Repo Stars Case study

Stack: Python pandas / NumPy SciPy / Statsmodels scikit-learn

7. Churn Prediction — Leakage-Free Retention Model — Analytics

Repo Stars Case study

Stack: Python LightGBM scikit-learn pandas / NumPy

8. Cohort Analysis Dashboard — Analytics

Repo Stars Case study

Stack: Python pandas matplotlib / seaborn Jupyter Notebook

9. Delivery Control Tower — Analytics

Case study

Stack: python sql duckdb superset

10. GMV Drop RCA — root cause on real data — Analytics

Case study

Stack: Python pandas DuckDB Plotly

11. LinkedIn Content Analytics — Analytics

Case study · private

Stack: Python openpyxl uv bootstrap

12. ML Fundamentals — scikit-learn Pipeline — Analytics

Repo Stars Case study

Stack: Python scikit-learn pandas matplotlib

13. Product A/B & Funnel Analytics — Conversion versus Retention — Analytics

Repo Stars Case study

Stack: Python pandas / NumPy DuckDB SciPy

14. Promo Margin Lab — what a promo rouble actually earns — Analytics

Repo Stars Case study

Stack: Python pandas scikit-learn PySpark

15. Python Analytics Playground — Analytics

Repo Stars Case study

Stack: Python pandas / NumPy Matplotlib pytest

16. RAG Evaluation Harness — retrieval and generation metrics — Analytics

Repo Stars Case study

Stack: Python scikit-learn pandas / NumPy TF-IDF

17. RFM Analysis of Bank Clients — Analytics

Repo Stars Case study

Stack: Python SQL Tableau

18. Sales Calls Analytics Dashboard — Analytics

Repo Stars Case study

Stack: Python Streamlit pandas

19. SERP Rank Lab — Analytics

Repo Stars Case study

Stack: Python DuckDB Streamlit NumPy / SciPy

20. SQL Analytics Case Study — Analytics

Repo Stars Case study

Stack: SQL dbt DuckDB Python

21. Product Analytics + A/B on Supabase — Product

Repo Stars Case study

Stack: Python Streamlit Supabase SQL

22. Product Analytics Dashboard (Streamlit) — Product

Case study · private

Stack: Python Streamlit pandas / NumPy

23. TaskFlow — PostHog Product Analytics Pipeline — Product

Case study · private

Stack: Python PostHog FastAPI Streamlit

24. Airflow DAG Platform — Engineering

Repo Stars Case study

Stack: Python Apache Airflow 3 PostgreSQL Docker Compose

25. Digital Garden — EQ in IT — Engineering

Repo Stars Case study

Stack: TypeScript Quartz v4 Markdown Obsidian

26. Scrolly English Speaking — Engineering

Repo Stars Case study

Stack: Astro TypeScript MDX D3

27. This Portfolio Site — Engineering

Repo Stars Case study

Stack: Astro TypeScript Markdown CSS custom properties

🏦 Volta Neobank — 23 case studies
  1. Volta — Funnel Analysis · Repo · Case study
  2. Volta — KYC Progress-Bar A/B Test · Repo · Case study
  3. Volta — Retention & Cohorts · Repo · Case study
  4. Volta — User Segmentation · Repo · Case study
  5. Volta — Churn Prediction · Repo · Case study
  6. Volta — RFM Analysis · Repo · Case study
  7. Volta — CLV Modeling · Repo · Case study
  8. Volta — Marketing Attribution · Repo · Case study
  9. Volta — Anomaly Detection · Repo · Case study
  10. Volta — Spend Analysis · Repo · Case study
  11. Volta — Support & Churn · Repo · Case study
  12. Volta — NPS Trends · Repo · Case study
  13. Volta — JTBD × Cohorts · Repo · Case study
  14. Volta — Traveler Unit Economics · Repo · Case study
  15. Volta — Premium Upsell · Repo · Case study
  16. Volta — 45+ KYC Deep-Dive · Repo · Case study
  17. Volta — Referral Segments · Repo · Case study
  18. Volta — Assisted CAC vs LTV · Repo · Case study
  19. Volta — FX Sourcing Feasibility · Repo · Case study
  20. Volta — Segment Premium Offers · Repo · Case study
  21. Volta — Anchor Launch CAC at Scale · Repo · Case study
  22. Volta — Dormant 45+ Win-back · Repo · Case study
  23. Volta — Causal Validation of KYC (DiD) · Repo · Case study

⚡ Activity

Last refreshed: 2026-10-30 10:53 UTC · 420 contributions in the last 7 days

📊 Stats, streaks, contribution map, languages and monthly trend

NikitaBoyarkin GitHub Stats

Top Languages

GitHub contribution map

Monthly contributions

Contribution types

NikitaBoyarkin 30-day activity graph

Contribution snake

Profile views

📝 Recent Notes

Auto-updated daily from the site RSS via GitHub Actions.

🛠️ Tech Stack

Core stack

Languages

Python SQL TypeScript JavaScript

Data & Machine Learning

Pandas NumPy SciPy Statsmodels scikit-learn LightGBM PySpark Matplotlib Seaborn Plotly Jupyter openpyxl

Storage & Pipelines

PostgreSQL SQLite DuckDB Supabase dbt Apache Airflow

BI & Product Analytics

Tableau Streamlit Apache Superset PostHog

Shipping & Quality

uv pytest Docker GitHub Actions FastAPI aiogram Playwright

Web & Publishing

Astro D3 Quartz Obsidian

Exploring next: ClickHouse · Bayesian A/B testing · real-time pipelines — every other badge above ships in one of the 27 projects.

🌐 Connect

LinkedIn Portfolio Blog Telegram Email

🧩 How this profile is built — situation, task, actions, result

Situation. The work lived across many repositories — experiments, SQL, retention, segmentation — each with its own numbers and no single reachable page tying a method to the result it produced.

Task. Turn that body of work into a profile a recruiter can navigate in one scroll: headline cases with real numbers, a public case study per project, and a portfolio site that demonstrates the analytics rather than describing it.

Actions. Published the work end-to-end. Projects are grouped into Experiments / Analytics / Product / Engineering, the Volta flagship carries 23 linked sub-cases, and the portfolio site at https://nikitaboyarkin.github.io renders every case study. In the site, headline numbers are frozen in src/lib/metrics.ts and CI-checked; profile cards and stats are self-hosted via scripts/build_profile.py.

Result. A public portfolio site plus a self-hosted profile: 10 playable SVG mini-games, the Volta flagship at +5.72 pp KYC conversion and €656K annualized impact, and a case study that links each method back to the repository that produced it.

Profile cards (stats, activity, contribution map, contribution types, monthly activity, top languages) are self-hosted via scripts/build_profile.py. Powered by snk, blog-post-workflow, skill-icons, shields.io.

Pinned Loading

  1. NikitaBoyarkin.github.io NikitaBoyarkin.github.io Public

    Bilingual RU/EN portfolio of a product and data analyst: 22 cases as an Astro static site, each headline metric frozen and drift-checked.

    HTML 5

  2. volta-banking volta-banking Public

    End-to-End Product Analytics Pipeline

    Python 4

  3. rfm-analysis-of-bank-clients rfm-analysis-of-bank-clients Public

    Segment bank clients by transaction behavior using Recency, Frequency, Monetary scoring

    HTML 12 1

  4. sql-analytics-case-study sql-analytics-case-study Public

    25 DuckDB SQL cases plus one real-data case (UCI Online Retail II): funnel, cohort retention, RFM, LTV and an A/B z-test written in pure SQL.

    Python 3

  5. ab_test ab_test Public

    Calibration-driven A/B testing toolkit: SRM, CUPED/CUPAC, delta-method ratio metrics, sequential and Bayesian methods, each validated by tests.

    Python 4

  6. tableau_cohort_analysis tableau_cohort_analysis Public

    Tableau-ready cohort retention and LTV pipeline on seeded synthetic data: 39 tests, CSV + .hyper export

    Jupyter Notebook 5