Freelancer profile translated to English.

Description

With a dual background in large corporations (Decathlon, La Redoute) and startups/entrepreneurship (Mapwize, SAIRA), I help companies build robust, scalable, and business-oriented applications.

I master the high-load requirements of microservices environments as well as the "Time-to-Market" imperatives dear to product creators.

My preferred technologies:

🔹 Back-end: Node.js, NestJS, TypeScript, Express, TypeORM

🔹 Front-end: React.js, React Native, Angular

🔹 Architecture: Hexagonal, DDD, Microservices, Event-Driven (Kafka)

🔹 Cloud & DevOps: GCP, AWS, Kubernetes (GKE), Docker, CI/CD

📍 Based between Paris and Lille | Available for new freelance missions (max 2 days on-site).

🗓️ Next availability: May 2026.

I am passionate about innovation and technology and I always work hard to excel in everything I undertake.

Feel free to contact me to discuss your needs.

Languages

French
Native or bilingual
Serbian
Native or bilingual
English
Conversational

Workplace preferences

Can work on-site

Lille (up to 50km)

Decathlon
Senior Backend Developer
E-COMMERCE
December 2022 - Today (3 years and 8 months)
Lille, France
Involved in the heart of Decathlon's digital ecosystem on two major microservices architecture platforms (NestJS, GCP, Kubernetes), with a strong international and transactional dimension.

🎯 Project 1: New international OneBooking platform (Build)

Creation from scratch of REST APIs for the new in-store service booking platform (repair, coaching).

• NestJS monorepo architectural design (DDD, CQRS).
• Setup of asynchronous communication via Kafka and CDC with Debezium.
• GitOps deployment on GKE.

🎯 Project 2: Sport Activities API (Run & Evolutions)

Development and optimization of an API ecosystem managing over €40k in weekly transactions.

• Advanced integration: Stripe payments, invoicing, Apple/Google Wallet e-tickets.
• Management of an event-driven architecture via Kafka and GCP Pub/Sub.

🛠️ Technical Stack: NestJS, Node.js, TypeScript, PostgreSQL, Elasticsearch, Kafka, GCP, Kubernetes, Docker, Datadog, Jest, Karate, FluxCD.
NestJs Apache Kafka Jest Node.js Google Cloud Platform (GCP)
SAIRA
Co-founder & CTO / Lead Developer
January 2020 - December 2022 (2 years and 11 months)
51100 Reims, France
Entrepreneurial adventure: complete scratch design of an innovative IoT solution integrating NFC chips into jewelry to link physical objects and digital memories. Steering the technical vision and developing the entire ecosystem.

🚀 Achievements:

• Development of the mobile application in React Native (TypeScript).
• Creation of two Web platforms (React.js): "Studio" (jewelry management) and "View" (multimedia visualization).
• Architecture and development of the centralized REST API (Node.js / Express.js) and NoSQL modeling (MongoDB).
• Deployment and management of Cloud infrastructure (GCP, Firebase).
• Setup of the brand's e-commerce platform (WordPress).

🛠️ Technical Stack: React.js, React Native, TypeScript, Node.js, Express.js, MongoDB, Firebase, GCP, Jest.
React Native Node.js Typescript Google Cloud Platform (GCP) MongoDB
Mapwize
Full Stack Developer
October 2018 - October 2020 (2 years)
Lille, France
B2B Fullstack Developer at the leader in indoor guidance (Smart Building), within an expert and agile tech team.

🚀 Achievements:

• Core Product: Development of the UI engine for the mapping application and continuous evolution of the backend API.
• SaaS Tooling: Development on the "Studio" application dedicated to managing client plans by facility managers.
• Data & IoT: Creation of Node.js servers to process real-time motion sensor data and development of multi-source ETL pipelines.
• Contribution to SDKs (Firebase/Angular) and developer documentation.

🛠️ Technical Stack: JavaScript, Node.js, Express.js, Angular, TypeScript, Webpack, Firebase, Jest.
Node.js Typescript Jest Angular Express