SCAbout Sami
Hi! I’m Sami — a Senior Java Backend Engineer with 5+ years of experience building high-performance backend systems, APIs, and microservices for banks and fintech companies.
I’ve worked for Crelan, AXA Bank, and ING Belgium as a consultant, where I helped deliver major system integrations, build secure APIs, and design scalable backend architectures.
💼 What I can do for you
✔ Java backend development (Quarkus, Spring Boot, Jakarta EE)
✔ REST API design & implementation
✔ Microservices architecture (clean, modular, scalable)
✔ Messaging systems (Kafka, async flows, event-driven systems)
✔ Batch processing (Java or C-based high-volume batches)
✔ Database design (PostgreSQL, Oracle, MySQL)
✔ CI/CD & DevOps support
✔ Refactoring legacy systems (COBOL → modern stack, C#, Java)
✔ Debugging, performance tuning & production support Banking & enterprise experience
I’ve delivered critical features for:
-Core banking systems
-Authentication & customer data management
-Internal orchestration services
-Data migration across legacy systems
-Real-time communication between distributed services Tech Stack Java, Quarkus, Spring --Boot, Kafka, REST, Microservices, Docker, Git, C/C++, Python, C#, SQL, Linux
💡 Why clients hire me:
-I work fast and deliver clean, maintainable code
-I understand complex enterprise systems (banking, VR, embedded)
-I’m flexible: from quick fixes to complete backend architecture
-I communicate clearly and reliably
If you need a strong backend engineer who delivers real value, I’m ready to help.
Let’s build something great together.
English
Native or bilingual
French
Native or bilingual
Italian
Native or bilingual
Arabic
Fluent
Can work on-site
Brussels (up to 50km)
Experience
- MainsysSOFTWARE ENGINEERJanuary 2023 - Today (3 years and 5 months)Brussels, Belgium• Key contributor to the core banking system integration during the Crelan–AXA merger, delivering stable and scalable backend services.• Designed, developed, and maintained multiple Java REST APIs using Quarkus, applying clean architecture, dependency injection, and reactive programming.• Implemented microservices for core banking features, including authentication flows, customer data management, and internal orchestration services.• Built asynchronous processing components using messaging technologies (Kafka).• Created and optimized batch processing modules in C, supporting data migration and transformation between systems.• Performed code reviews, contributed to CI/CD improvements, and enforced best practices for clean code and backend performance.• Collaborated with DevOps and product teams to deploy, monitor, and troubleshoot backend services in production environments.• Analyzed and translated COBOL applications into C#.
- Virtual ParkR&D ENGINEERJanuary 2021 - January 2023 (2 years)Belgium• State-of-the art of VR (virtual reality) technologies in scientific literature.• Study and analysis of VR technologies (e.g., tracking systems, haptic technologies).• Software developer (JAVA, Python, C#).• Embedded Linux on Raspbian and Ubuntu.• Developed the database for the newly I/O system installed and the communication between clients and server.• Design of the network distribution of an attraction park.• Designed and implemented RESTful APIs with Java (Spring Boot) for the new web platform of the company.• Project executive. Design, implementation and testing of an airflow generator made of amplifiers, speakers and controlled by a Raspberry Pi.
- HAEMERSProject Assistant EngineerJuly 2019 - September 2019 (2 months)Brussels, Belgium• Stage as Assistant Engineer of 2 months. working on Database (sqlite3 python) on Raspberry and in electronics circuits.• Contact the sellers and search the electronic components.• Developed the database for the newly I/O system installed. This is able to recollect the data from the sensors, send it to a central server who will then store the values in the database each hour.• Developed an GUI in JAVA representing the sensors on the field.• Design and implement a PCB to have a better connection between the sensors and the µC.
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Education
- MBA DIPLOMAUniversité libre de Bruxelles Ecole Polytechnique2021MBA DIPLOMA
- BACHELOR DEGREEUniversité libre de Bruxelles Ecole Polytechnique2019BACHELOR DEGREE