Marwen EL KEFI

-Designing and developing web and desktop applications used by GTT engineers to model, calculate and document LNG tank designs for LNG carriers. -Building internal tools for project tracking and technical documentation (dashboards, milestones, deliverables, PLM integrations) to support shipbuilding projects from design to delivery. -Implementing real‑time dashboards and analytics for vessel operational data (KPI monitoring, performance tracking, maintenance insights, IoT data integration). -Modernizing legacy internal tools with WinUI 3 and latest .NET versions, improving usability, performance and maintainability. -Optimizing SQL Server queries and application performance (response times reduced by ~40%) and systematically reducing technical debt through code reviews and static code analysis. -Working in Agile Scrum with naval engineers and business experts: backlog refinement, user stories, sprint planning, demos and production support. Key technologies C#, .NET 8/10, ASP. NET Core/MVC, Blazor (Server & WebAssembly), WinUI 3, SQL Server, Azure (App Services, Application Insights), GitLab, Azure DevOps, NUnit, Moq, SonarQube, Veracode.

-Contributed to the RMS Integrations solution, integrating revenue management systems with major booking platforms (Booking, Ctrip, Expedia) for international hotel chains. -Audited, refactored and extended unit and integration tests around existing .NET Core services, increasing test coverage to 75%+ and reducing regressions in production. -Implemented integration tests for AWS Lambda services and improved reliability of data flows between internal systems and external providers. -Collaborated with Product and Business teams to clarify requirements and ensure high‑quality deliveries in an Agile Scrum environment. Key technologies C#, .NET Core, NUnit, PostgreSQL, AWS (Lambda, API Gateway, SQS, S3, CloudWatch Events), Visual Studio, DBeaver, PGAdmin, GitLab.

-Designed and developed RESTful APIs for the CXG Connect platform used by luxury brands (L’Oréal, Dior, DFS, Apple, Chanel, Gucci) to enhance in‑store customer experience and long‑term relationships. -Participated in backend architecture design (Clean Architecture, DDD) and database modeling on PostgreSQL, ensuring scalability and maintainability. -Took ownership of critical incident resolution (L2 support), bug fixing and multi‑environment deployments (DEV, QA, PRE‑PROD, DEMO, PROD). -Led a data migration project from Shopmetrics to PostgreSQL via APIs and Node.js scripts, successfully migrating 500k+ records with strict data integrity controls. -Mentored junior developers, performed deep code reviews and contributed to technical documentation and user manuals. Key technologies C#, ASP. NET Core 3.1, Entity Framework Core, PostgreSQL, Elasticsearch, Node.js, Sequelize, React.js (collaboration), NUnit, Azure DevOps, Docker, Git.

-Designed and developed a reusable web framework based on Blazor Server to accelerate migration of legacy desktop business applications to the web. -Built “Omrane Estate”, a real‑estate ERP covering land studies, project execution tracking and commercialization workflows. -Analyzed complex business processes with stakeholders and translated them into robust domain models and modules. -Delivered end‑to‑end features (analysis, development, testing, documentation) and provided technical and functional guidance to interns. Key technologies C#, .NET Core, Blazor Server (Syncfusion), SQL Server, WinForms (.NET Framework, Infragistics), Visual Studio, SVN, StimulSoft Reports, HelpNDoc.

-Designed and developed a heatmaps and visitor recordings platform to analyze user behavior on e‑commerce websites and improve UX and conversion. -Implemented a complete e‑commerce web application: global architecture, REST APIs, business services and automated tests. -Performed requirements analysis, database design and technical documentation for both analytics and e‑commerce projects. Key technologies C#, .NET Core, Angular, SQL Server, Visual Studio, VS Code, Git, Agile Scrum.