Open to full-time opportunities

Data Analyst
& Engineer

Master's student at EFREI Paris, specializing in Data Analysis. Background in financial data systems at BNP Paribas and NLP/ops engineering in Tokyo. Seeking a junior role at the intersection of data and quantitative analysis.

View projectsarthur.gagniare@efrei.net
Market Data
ECB RATES · SIMULATED
SPXS&P 5005420.50+0.00%
NKYNikkei 22538450+0.00%
EURJPYEUR / JPY186.80+0.00%
VIXVolatility17.30+0.00%
EURUSDEUR / USD1.0832+0.00%
DXYDollar Index104.45+0.00%
Forex: open.er-api.com · Indices: simulated

About

Data, strategy, and
a love for Tokyo

I hold a Master's in Computer Engineering from EFREI Paris and am currently studying Japanese & Business at ISI Language School in Tokyo while working at Kenja K.K. on projects at the intersection of AI, machine learning, and business operations.

Previously at BNP Paribas in Paris, I built financial data pipelines and dashboards covering Asian & Chinese markets. That background lets me bridge business needs and technical solutions particularly in data-driven, cross-cultural environments like Tokyo's tech ecosystem.

Stack

PythonpandasNumPyscikit-learnmatplotlibseabornSQLPower BIMachine LearningNLPAPI IntegrationDatabase ManagementData AutomationVBA

Languages

French · NativeEnglish · C1 (935 TOEIC)Polish · ProficientJapanese · Beginner

Projects

Showcase work

Quant

Cross-Sectional Momentum Backtester

Python backtesting engine for equity momentum strategies on S&P 500 constituents. Implements monthly rebalancing, transaction cost modeling, and full performance attribution, Sharpe, Sortino, max drawdown, and rolling beta vs. benchmark.

PythonpandasNumPymatplotlibyfinanceGitHub ↗
Live · Finance

EUR/JPY Monitor

Bloomberg-style EUR/JPY dashboard: live rate, SMA/RSI/Bollinger Band overlays, 1,000-path Monte Carlo simulation with t-distribution, macro event radar, personal trade log with auto-resolution, and conversion calculator.

ReactViteRechartsTailwindFrankfurter APILive app ↗
Data · Japan

Japan Labour Market Dashboard

Interactive Streamlit dashboard analysing Japan's labour market using official e-Stat government data. Tracks the job-to-applicant ratio (有効求人倍率) from 2015 to present, industry breakdown, Tokyo vs national comparison, unemployment trends vs OECD average, and data analyst salary outlook in Tokyo.

PythonStreamlitPlotlypandase-Stat APILive app ↗
Quant · Risk

Risk & Performance Tearsheet CLI

Installable Python CLI that accepts any equity-curve CSV and produces a Rich terminal risk summary plus a 5-panel matplotlib PDF tearsheet. Computes CAGR, Sharpe, Sortino, Calmar, historical and parametric VaR (95/99), CVaR, max drawdown, skewness and kurtosis, plus alpha, beta, information ratio and up/down capture vs. any yfinance benchmark.

PythonclickRichmatplotlibpandasscipyyfinanceGitHub ↗
ML · Finance

Credit Default Prediction Model

Gradient boosting classifier (XGBoost + SHAP explainability) trained on the UCI credit dataset. Includes feature engineering on payment history, SMOTE oversampling for class imbalance, and an interactive Streamlit dashboard.

PythonXGBoostSHAPscikit-learnStreamlitLive demo ↗
Real work · Kenja K.K.

Multilingual VoC NLP Pipeline

Production NLP pipeline to detect and classify misrouted customer calls from 5,000+ monthly transcripts in French, English, and Japanese. Rule-based routing logic with zero LLM dependency fully auditable and traceable for compliance.

PythonNLPspaCypandasAPI Integration

Experience

2023 2024

BNP Paribas

Paris, France

Data Analyst Intern

  • Designed and managed complete SQL database architectures, optimizing data integration and cleansing for business operations across Asian and Chinese financial markets.
  • Built real-time interactive Power BI dashboards to monitor analyst activities and support data-driven decision-making.
  • Developed a VBA automation tool for analyst data entry, eliminating significant manual workload.
  • Created API test cases and user scenarios to improve program reliability.

2025

Kenja K.K.

Tokyo, Japan

Project Manager & Business Analyst Intern

  • Built a custom resource planning tool with automated conflict detection and dynamic dashboards for leadership visibility.
  • Developed a multilingual NLP pipeline (FR/EN/JP) to detect misrouted calls, delivering Voice-of-Customer insights from 5,000+ monthly transcripts.
  • Delivered clean, auditable reporting logic without LLMs to ensure traceability and future AI scalability.
  • Aligned business, sales, and technical stakeholders by translating operational needs into structured systems.

Education

Apr 2026 - Present

ISI Language School

Tokyo, Japan

Japanese Language & Business

Intensive Japanese language program with a focus on business communication and cross-cultural professional practice.

2020 - 2025

EFREI Paris

France

Master's in Computer Engineering

Specialization in Data Analysis. Coursework covering machine learning, big data architectures, statistical modeling, and data visualization.

Let's work together

Open to junior data analyst and data engineer roles in Tokyo and internationally. Currently based in Japan.

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