Mellekh Hedi

Context: Contributed to the B2C mobile app used by 2M+ customers worldwide, supporting TotalEnergies’ transition to cleaner mobility and the management of its global EV charging network. Key contributions: – Developed and optimized backend microservices (NestJS, PostgreSQL, RabbitMQ, AWS, Docker, Kubernetes) ensuring secure, high-performance transaction flows. – Implemented reliable messaging and data processing pipelines with RabbitMQ, ensuring accurate reception of charging sessions and payment transactions across thousands of stations worldwide. – Improved data consistency and monitoring between distributed services to guarantee smooth reconciliation of financial and charging data. – Deployed and maintained services in containerized and orchestrated environments using Docker and Kubernetes, improving scalability and resilience. – Collaborated in an Agile team with product managers, designers, and developers to deliver new features and reduce run-time incidents. Technologies: NestJS, PostgreSQL, MongoDB, RabbitMQ, AWS (EC2, Lambda, S3, Cloudwatch), Docker, ELK, Kubernetes, Microservices (Hexagonale, DDD).

Context: Contributed to the development of a global serverless IoT platform for Dormakaba, a world leader in smart and secure access solutions, managing building and room access devices across multiple continents. Key contributions: – Designed, developed, and maintained a serverless architecture on AWS to handle massive real-time traffic from access devices (card readers, electronic keys, doors). – Built and optimized data ingestion pipelines using MQTT and AWS IoT Core, ensuring reliable encoding/decoding and processing of millions of messages coming from IoT devices worldwide. – Improved scalability and resilience of event-driven services, guaranteeing performance in high-throughput data environments. – Ensured data security and compliance for sensitive access information, including authentication events and device telemetry. – Collaborated within an Agile team to continuously enhance IoT data flows and deliver robust solutions for global customers. Technologies : NodeJs/NestJs, PostgreSQL, MongoDB, AWS (EC2, Lambda, S3, Cloudwatch, SQS, IoT, API Gateway), MQTT, React, Serverless.

Context: Contributed to modernization projects for CAVIMAC, a special French Social Security regime, as part of Klee Integration’s mission to deliver robust and scalable information systems. Key contributions: – Led a database migration project using Talend, designing ETL jobs to transfer and transform data from a legacy system into PostgreSQL. – Ensured data integrity and consistency during the migration by implementing validation and reconciliation processes. – Developed and maintained backend services (Spring Boot, Node.js) to integrate the new database into the information system. – Collaborated within an Agile team of developers and business experts to secure reliable and compliant data operations. Technologies : SpringBoot, PostgreSQL, Talend, ELK

Context: Completed a 6-month internship within GE’s IT Leadership Program (ITLP), gaining hands-on experience on strategic IT and data initiatives in a global environment. Key contributions: – Supported the SAP migration project, assisting with requirements gathering, testing, and validation to ensure smooth transition and business continuity. – Contributed to the creation of GE’s new enterprise Data Lake, enabling centralized data storage and integration for analytics. – Coordinated between development teams and business stakeholders in an international, English-speaking environment to ensure project alignment. Technologies: SAP, Data Lake platforms, Project & Stakeholder Management.