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mayankjoshiii/README.md

LinkedIn Portfolio Email


About

Business and data analyst with nearly four years onsite at Google LLC (Associate Analyst, via Vaco Binary Semantics) and an MSc in Business Analytics (Distinction) from Swansea University. I like starting from a business question and working back through the data to something people can act on.

Every project below has a live interactive demo, no installation needed. To be upfront about the data: the churn model uses a real public dataset and the job-market analysis uses a 25-listing sample, while the other dashboards run on simulated data generated in the browser to show the techniques. Each one says which it is.


Tech Stack

Python SQL JavaScript Pandas scikit-learn Plotly Tableau Excel Git JIRA


Live Projects

🤖 AI & Machine Learning

Project What It Does Stack Links
ML Explainability & Monitoring SHAP-style feature explanations · Data drift detection (PSI) · Fairness analysis · Partial dependence plots · What-if simulator · simulated data Plotly.js · JS ML Demo · Code
Customer Intelligence Platform K-Means clustering (written in JavaScript) · RFM segmentation · Cohort retention · Sankey customer journey · simulated data Plotly.js · JS ML Demo · Code
NLP Sentiment & Text Analytics Lexicon-based sentiment · TF-IDF keyword extraction · Aspect-based analysis · 5,000 simulated reviews Plotly.js · NLP Demo · Code
RAG Pipeline Analytics Embedding-space view (simulated t-SNE-style layout) · Retrieval quality heatmaps · Cosine similarity · simulated data Plotly.js · Vectors Demo · Code
Customer Churn Prediction SQL exploration → Feature engineering → Logistic Regression + Random Forest (scikit-learn) · 80% accuracy · AUC 0.85 cross-validated on 7,043 real customers (IBM Telco sample) Python · scikit-learn · SQL Demo · Code

📊 Data Analytics & Business Intelligence

Project What It Does Stack Links
A/B Testing Analytics z-test / t-test · Bayesian analysis · Sequential testing · Sample size calculator · Power analysis · simulated experiments Plotly.js · Statistics Demo · Code
Time-Series Forecasting Trend-seasonal decomposition · Moving average, exponential smoothing, Holt-Winters, linear trend · Anomaly detection · simulated series Plotly.js · Forecasting Demo · Code
Real-Time Operations Analytics KPI ticker on a simulated live feed (2.5s refresh) · Geographic heatmap · System health monitor · Threshold alerts Plotly.js · Real-time Demo · Code
Financial KPI Dashboard Revenue vs Budget vs Forecast · EBITDA · P&L waterfall · Budget Variance RAG · illustrative 32-row sample Python · Excel · Plotly.js Demo · Code
UK Job Market Analysis 25-listing sample (Jan to Feb 2025) · Salary by region · Top skills · Remote vs hybrid Python · pandas · Plotly.js Demo · Code

What These Projects Demonstrate

Skill Evidence
End-to-End Delivery Data → analysis → deployed interactive dashboard, all on GitHub Pages
Machine Learning Logistic regression and random forest with scikit-learn, cross-validated (churn); K-Means written from scratch in JavaScript (customer intelligence)
Statistical Rigour Z-tests, Bayesian inference, power analysis, confidence intervals (A/B Testing)
NLP Sentiment lexicons, TF-IDF, aspect-based analysis, topic extraction
AI Analytics Dashboards for RAG retrieval metrics: precision@K, MRR, NDCG (simulated data)
Model Governance SHAP explanations, data drift (PSI), fairness auditing
Live Dashboards Simulated streaming KPIs with threshold alerting
Financial Literacy P&L analysis, EBITDA, budget variance, gross margin modelling

GitHub Activity

GitHub Streak    Contribution Graph

Open to Business Analyst & Data Analyst roles — any industry, worldwide

UK-based · Graduate Visa · Available immediately

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  1. uk-job-market-analysis uk-job-market-analysis Public

    UK BA/DA job market analysis | 25-listing sample, Jan to Feb 2025 | Salaries, top skills and regional split | Python · pandas · Plotly.js

    Jupyter Notebook

  2. customer-churn-prediction customer-churn-prediction Public

    Customer churn prediction on 7,043 real customers (IBM Telco sample) | Logistic regression + random forest | 80% accuracy, AUC 0.85 cross-validated | Python · SQL · scikit-learn

    Jupyter Notebook

  3. financial-kpi-dashboard financial-kpi-dashboard Public

    Interactive Financial KPI Dashboard | Revenue vs Budget vs Forecast | Gross Margin, EBITDA & Variance Analysis | Illustrative sample data

    HTML 1