Benjamin ROSSIGNOL

Data Engineer

Salary / Daily rate

91120 Palaiseau, France

Freelance, open to permanent contract

Can come onsite

Skills

Fullstack DevelopmentMobile DevelopmentKotlinNextData EngineeringFrontend DevelopmentBackend DevelopmentMicroservicesNumPyReactSassJavascriptTailwind CSSpandasNodeCSSscikit-learnJavaExpressAzureMongoDBDevOpsSQL databasesScalaPythonAWSCPostmanLinuxBackend DeveloperGitData EngineerVercelWeb DeveloperMobile DeveloperDockerRESTful APIsGitHubBootstrapPostgreSQLGitLabTypescriptGradleFullstack DeveloperFastAPIHTMLMySQLFlaskWindowsSoftware Engineer

Languages

French (Native)English (Fluent)Chinese

About me

Intro

As an EFREI Paris graduate in Data & AI , I combine data engineering expertise from my experiences at Renault and Nokia Bell Labs with a passion for software development, specifically Kotlin Multiplatform. Currently AWS and Azure certified, I am developing Dionys, a cross-platform board game application. As a dedicated Crossfit practitioner, I bring the same discipline to my technical projects as I do to my physical training. Portfolio link : https://benjaminrossignol.vercel.app/

Links

Work experience

Software Engineer

IndépendantFreelance

Sep 2025 - Present

1 year 2 months

Remote

Currently engaged in developing cross-platform software solutions and deepening my expertise in software engineering. Portfolio: https://benjaminrossignol.vercel.app/ • Design and deployment of a personal portfolio website to showcase technical projects and expertise. Main Project: Dionys (Cross-platform board game application) • Architecture: Developed using Kotlin Multiplatform (KMP) for optimal code sharing between iOS and Android. • Software Quality: Implementation of a robust technical stack including unit testing, linters, and Continuous Integration (CI/CD). • UX/UI: Design of user-centered interfaces powered by high-performance backend logic. Training & Self-Learning: • CS50 Certification (Harvard): Consolidation of fundamental computer science concepts in algorithms and C. • HSK Preparation (Chinese): Intensive language study with a focus on international mobility. • Daily training for Hyrox competitions (Oslo on Sept 26, 2025; Toulouse on March 19, 2026), building discipline and resilience applicable to technical challenges.

Data Engineer (Stage de fin d'études)

Renault Group

Mar 2025 - Sep 2025

7 months

78280 Guyancourt, France

Within the Global Academy, I spearheaded the digital transformation of training monitoring processes across 22 factories and 9 countries. • Data Engineering: Designed and deployed a centralized data architecture to automate the ingestion and processing of data from heterogeneous sources. • Low-Code/Fullstack Development: Created data entry interfaces and dashboards using Power Apps & SQL to streamline operations for 600 trainers. • Impact Analysis: Audited and cleaned complex datasets covering 100 training programs to ensure the reliability of Key Performance Indicators (KPIs).

Data Research Analyst

Nokia Bell Labs

Nov 2023 - Apr 2024

6 months

91300 Massy, France

• Cutting-edge Visualization: Developed an interactive dashboard (Plotly Dash) for real-time monitoring of a multi-layered security architecture (IDS). • Data Engineering: Conducted analysis, cleaning, and aggregation of massive network traffic datasets (2GB+)—including Header and Payload data—for attack classification (DoS, Botnet, MITM). • ML Modeling: Integrated supervised classification models (Random Forest, SVM, VAE) and unsupervised clustering algorithms to identify unknown threats and zero-day attacks. • Optimization & Scalability: Performed a complete codebase refactor to support responsive design and drastically reduced data loading latency. • Scientific Communication: Created pedagogical interfaces to explain complex research concepts and patent-pending technologies to diverse stakeholders (researchers, clients, and investors).


Education

EFREI Paris

Engineering Degree, Computer Engineering, Major in Data & Artificial Intelligence

2020 - 2025

5 years

Activities and societies: Horizon EFREI Association (Academic Tutoring, 2020-2024) EFREI Basketball (Player, 2025)

Beijing International Chinese College (BICC) - Chinese Language School

General Chinese, Chinese Language and Literature

2024 - 2024

1 month

Grade: HSK1

Concordia University

International Mobility, Computer Science

2022 - 2022

4 months


Licenses & certifications

CS50's Introduction to Computer Science

Issued: Dec 2025

Certified by Harvard University

AWS Certified Cloud Practitioner

Issued: Jan 2025

Certified by Amazon Web Services

Microsoft Certified: Azure AI Fundamentals

Issued: Dec 2024

Certified by Microsoft

TOEIC

Issued: Jul 2024

Certified by ETS

Microsoft Certified: Azure Fundamentals

Issued: May 2024

Certified by Microsoft

Certificat Voltaire

Issued: Jun 2023

Certified by Certificat Voltaire

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