Hazem Ben khalfallah 🇵🇸 𓂆

-Led a high-performing engineering team of 10+ engineers, delivering 1 important feature per 2-week sprint and reducing feature delivery time from 15 to 10 days, accelerating high-value functionality. -Established strategies to shield the team from disruptions, enabling focus on single sprint goals and reducing context-switching, resulting in on-time delivery for 80% of features. -Coordinated with stakeholders and the Paris office team, improving cross-team synchronization and enabling delivery of 5+ major features, ensuring seamless collaboration. -Conducted regular one-on-one meetings, achieving 0 voluntary attrition over 6 months and 9/10 employee satisfaction scores, driving team engagement and growth.

-Provided hands-on guidance and technical direction to team members, enabling the delivery of 10+ major features on time and aligning deliverables with business goals, driving seamless project execution. -Contributed as an individual engineer 50% of the time, developing 5 critical modules and resolving tens of complex technical issues, guaranteeing high-quality and timely delivery of key functionalities. -Improved cross-team collaboration by maintaining close communication with stakeholders and team leaders, reducing average queue time from weeks to days and enabling seamless project execution and on-time delivery. -Fostered a culture of collaboration and technical excellence as a team lead, increasing team productivity from 1 to 3 features per sprint and improving code quality scores, driving consistent delivery of high-value features. -Built and maintained scalable, high-quality code, achieving 99.9% system uptime and reducing bug reports from 20 to 5 per month, guaranteeing reliability and performance for the cloud platform.

-Designed and implemented the onboarding system for the "Campaign Manager," using Java and Spring to integrate CSV, FTP, Dropbox, and 3 e-commerce connectors (Shopify, PrestaShop, Magento). Automated data ingestion, reducing processing time by 40%, ensuring real-time data freshness (99.9% uptime), and improving efficiency for 10+ client campaigns, including a large American clothing company with 1M+ monthly transactions. -Engineered a high-performance data processing system using Java, Spring, MongoDB, GridFS, and Kafka to ingest and process 100M+ sales records from historical data files. Transmitted this data to the big data platform, enabling personalized ad campaigns for 1M+ end users and improving campaign relevance by 25%. -Mentored and guided 5+ junior developers, helping them adhere to coding standards and best practices in Java and Spring. Improved code quality and reduced post-release defects by 20%, while accelerating their onboarding time by 30%. -Played a key role in sprint planning by challenging the functional and technical aspects of 100% of user stories, ensuring alignment with client needs and delivering measurable business value. Utilized Agile methodologies to maintain 95% on-time delivery for sprint goals. -Led the development of 100% of the team’s major features, delivering high-quality, scalable Java-based solutions that drove key business outcomes. Recognized by my R&D manager as a key contributor and for providing technical leadership and mentorship to peers. -Designed and optimized RESTful APIs and microservices using Spring Boot, improving system performance and scalability. Ensured seamless integration with third-party services and internal systems, supporting the platform’s evolution and 20% increase in platform adoption.

Responsibilities: - Developed movies, kids, series, configuration, and launcher mobile applications for Android TV Boxes, ensuring a seamless and engaging user experience. - Designed and implemented the RevBox management web application to streamline sales and stock management processes, improving operational efficiency. - Built the RevBox remote control backend application, providing a robust REST API for retrieving and searching movies and series, enhancing content accessibility. - Engineered the RevBox voice control application, enabling intuitive content search via voice commands, elevating user interaction and convenience. - Configured and managed ElasticSearch, backend, and database servers to ensure optimal performance and reliability for all applications. - Oversaw deployment processes on test and production servers, ensuring smooth and error-free releases. - Implemented remote update mechanisms to push new versions to all sold RevBox devices, ensuring consistent performance and feature enhancements across the user base.

Responsabilities: - Implemented real-time Dreambox communication to enable personalized notifications on TV screens, allowing users to switch channels or receive messages directly on their TVs. - Designed and implemented the REST API to enable seamless communication and integration across systems. - Developed a real-time chat system to facilitate instant user interaction and engagement. - Built and integrated an intelligent video player with features like video playback, pre-roll and in-roll ads, timestamped comments, and autoplay functionality. - Created the Pinhole administration app and enhanced the Pinhole ads application with new functionalities to improve usability and performance. - Configured Elasticsearch servers and developed advanced search features, including autocomplete and complex query handling. - Monitored and optimized Heroku services and database servers to ensure system reliability and performance. - Managed deployments to test and production servers, ensuring smooth and efficient version releases. Context: Pinhole.tn is a Tunisian video streaming platform that merges TV with social media, offering adaptive HD streaming and dynamic content interaction. It supports Dreambox compatibility for TV notifications and channel switching, and provides flexible advertising tools for customizable ad placements. With social media integration, it boosts engagement by sharing comments and sending content notifications, creating a seamless, interactive viewing experience.

Responsabilites: - Trained experienced Java developers to build Oracle 11g ADF (Application Data Framework) applications. - Prepared a comprehensive course on developing, testing, and deploying fully functional ADF web applications. - Animated training sessions for the Mauritanian General Directorate of Taxes to enhance their technical capabilities. - Mentored and reviewed code, helping the team adopt better engineering practices and elevate code quality within the ADF framework. - Dedicated approximately 50% of my time to contributing as an individual engineer, actively participating in ADF applications development and problem-solving. Context: BGI is a Tunisian IT company specializing in software development, IT consulting, and digital transformation services. The company focuses on delivering tailored solutions for businesses, including custom software development, enterprise resource planning (ERP), and web applications. BGI is particularly known for its expertise in human resources (HR) systems, ERP solutions, banking software, and booking systems, providing tools to optimize operations and drive digital growth across various industries.

Responsibilities: - Participated in the design and development of a Human Resources Management Application, ensuring alignment with business requirements and technical specifications. - Developed and maintained EJB (Enterprise JavaBeans) components to handle business logic and backend operations. - Designed and implemented JSF (JavaServer Faces) and IceFaces/PrimeFaces user interfaces, creating responsive and user-friendly web applications. - Utilized Hibernate for object-relational mapping (ORM) to streamline database interactions and improve data management efficiency. - Integrated Jasper Reports for generating dynamic and customizable HR reports, such as payroll, attendance, and performance metrics. - Wrote and optimized SQL queries and stored procedures for Oracle Database to ensure efficient data retrieval and manipulation. - Configured and managed JAAS (Java Authentication and Authorization Service) for secure user authentication and role-based access control. - Used Quartz Scheduler to automate HR-related tasks, such as payroll processing and notifications. - Collaborated with the team using Subversion (SVN) for version control, ensuring smooth code integration and project management. - Built and maintained the project structure using Maven, managing dependencies and streamlining the build process. - Assisted in troubleshooting, debugging, and resolving technical issues across the application stack. - Contributed to code reviews and adopted best practices to ensure high-quality, maintainable, and scalable code. Context: As a Junior JEE Developer, I contributed to the conception and development of a Human Resources Management Application, leveraging Java Enterprise Edition (JEE) technologies and modern frameworks to deliver a robust and scalable solution.