Freelancer profile translated to English.
Back to original languageAbout Rayan
Tech Lead NestJS Typescript / Java Spring boot / VueJS
Building teams of technical excellence.
Passionate about software craftsmanship: rigorous code reviews, pair programming, TDD, and sharing engineering best practices.
French
Native or bilingual
Can work on-site
Lille (up to 10km)
Experience
- AUCHAN RETAILSTech LeadCONSULTING AND AUDITSJune 2024 - Today (2 years and 2 months)Lille, FranceMission: Complete modernization of critical payment infrastructure (millions of transactions/day) with a Craftsmanship approach.Actions:- Participation in the FINE project: Scoping of the PCD perimeter, automation, processing, and ingestion of financing/collection files into a DataPlatform- Scoping & development of a module for account transfers (marketplace) (Java, Spring boot)- Refactoring from scratch: Dismantling legacy accounting module (BOKX) with zero-defect migration (Node, NestJS)- Performance optimization: SQL optimizations, JS algorithms, application architecture- Cloud Native: Deployment on GCP (Cloud Run, GKE, IAM, Cloud Armor, Bucket, Cloud SQL) with Terraform and GitOps- Advanced monitoring: Elasticsearch/Kibana stack, automated alerting, business KPIs- API Gateway: Implementation of a Gravitee middleware centralizing payment flows- Innovation: Development of a payment simulator, Development of an alerting tool,Results:- Code Quality: Implementation of standards, systematic code reviews, pair programming- Documentation: ADR, best practices, technical guidelinesResults: 99.7% -> 99.95% availability • -80% critical incidents on historical module • -50% GCP costs • Real-time anomaly detectionStack: Java, TypeScript, NestJS, Spring Boot, VueJS, GCP, Kubernetes, Terraform, Elasticsearch
- MEDIAMAGTechnical LeadAGRICULTURESeptember 2023 - June 2024 (9 months)Lille, FranceE-commerce platform of the drive-through type requiring a complete technical overhaul.Leading the architecture migration of a Java project with Spring Boot to NodeJS with NestJS and improving overall performance.Actions:- Orchestration of the progressive migration of critical modules with backward compatibility strategy (Java Spring Boot to NodeJS / NestJS)- Development of an IP telephony POC optimized for performance in a high-load environment (Java Spring boot)- Implementation of a complete DevOps chain with automated tests and continuous quality validation- Leading pair programming sessions and technical training for junior developers
- O'ClockTrainer / Web / AIEDUCATION AND E-LEARNINGMarch 2023 - June 2024 (1 year and 3 months)Paris, FranceProfessional training for students retraining for tech careers (Bac+3/4 level).Designing and leading advanced training modules on software architecture and AI.Actions:- Development of comprehensive educational paths on modern software architecture (Node, NestJS, Prisma)- Design of practical workshops on web performance optimization and development best practices- Creation of introductory AI modules (Machine Learning, Deep Learning) accessible to non-data profiles- Supervision and coaching of 15+ final year projects with defense before a professional juryResults:- 85% employment rate for coached students- 3 full cohorts successfully trained (75+ students)
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Education
- Chartered Financial AnalystCFA Institute2025Je prépare actuellement le CFA de niveau 1 avec l'objectif de passer l'examen à la fin de l'année 2025. Par la suite, je souhaite poursuivre mes études en complétant le niveau 2 et le niveau 3 afin d'obtenir la certification complète CFA.
- Master's Degree in Machine LearningCentraleSupélec2023Ingénieur en machine learning / Validation des acquis professionnels et personnels (LLM, IA Générative, MLOps, Data Science, Perceptron, Computer Vision, Dashboard)