Fatura Takip Sistemi

Project Type

• The project is a full stack web application.
• The frontend was developed with Angular, and the backend was developed with ASP.NET Core.

Architecture / System Design

• The project follows a microservice architecture.
• The main layers are App, API, Scheduler, and database.
• The App, API, and Scheduler layers run as dockerized services on CentOS servers.
• The App layer is the web application accessed by end users.
• The App layer was created with the ASP.NET Core Angular template, so it includes both the client application and the API required by that client.
• The API layer serves the OnePlus mobile application.
• The Scheduler layer contains scheduled jobs developed with Quartz.
• All services run independently from one another.
• The SQL Server database runs on a separate server.
• Nginx is used as a load balancer because the services are heavily used.
• Redis is used as a separate service for user sessions.

Technologies Used

• Backend: C#, ASP.NET Core Web API 3.1, Entity Framework Core 3.1, Dapper, NLog, RestSharp
• Frontend: Angular 8, TypeScript, PrimeNG, Chart.js, FullCalendar, HTML, CSS, JavaScript, jQuery
• Database and messaging: SQL Server, RabbitMQ, Redis
• Document and file processing: ZXing, Spire PDF, iTextSharp 5.5, GhostScript, ExcelJS, IV-Viewer
• Security and authentication: Azure MSAL, CryptoJS, AES, permission based authorization
• Scheduling and integrations: Quartz, SOAP, REST, Ocean Middleware
• DevOps and deployment: Jenkins, Docker, Docker Compose, Git, GitLab, CentOS, OpenShift

Key Technical Details and Modules

• Designed component based frontend screens.
• Built user-friendly interfaces with PrimeNG.
• Supported multi-language usage.
• Integrated with SOAP and REST services through Ocean Middleware.
• Added XML data upload capabilities.
• Implemented Excel import and export flows.
• Encrypted selected request and response payloads with the AES algorithm.
• Used stored procedures and indexes to improve performance.
• Processed and displayed PDF documents.
• Built scheduled tasks for external service integrations.
• Integrated authentication with Azure AD.
• Implemented permission based authorization.
• Supported containerized execution with Docker and Docker Compose.
• Managed deployment flows through Jenkins Pipeline.
• Supported Kubernetes deployment through OpenShift.

Participation and Timeline

• The project was developed by ID3 for FOMER, the Financial Operations Center within Yıldız Holding.
• I worked on the project for approximately one year, between April 2024 and March 2025.

Project Management / Team Structure

• Two ID3 teams were responsible for Yıldız Holding projects: the Ocean Middleware integration team and the Sharks application development team.
• I worked in the Sharks team as a Software Development Specialist.
• I joined an existing long-running project rather than starting from scratch.
• The team included a Business Analyst / Project Manager, Team Lead, Senior Software Specialist, Junior Software Engineer, and three Intern Engineers.
• I personally interviewed and helped onboard one of the intern engineers.
• The team followed an Agile methodology.
• Customer requests were converted into tasks on Jira, and daily planning was handled through Microsoft Teams daily meetings.
• Deployment work was planned through two-week or monthly sprints.
• After sprint completion, tasks were merged into the main branch through Git.
• I helped the team resolve branch conflicts during version control.
• Deployments were first completed in UAT, then moved to production after approval.
• I managed the deployment process.
• There was also a four-person Product Owner team on the customer side.

Personal Contributions and Responsibilities

• Built user interfaces with PrimeNG.
• Developed API endpoints for the OnePlus mobile application.
• Developed and refactored endpoints required by the App layer.
• Implemented XML data upload flows.
• Processed, displayed, and converted PDF documents with ZXing, Spire PDF, iTextSharp, and GhostScript.
• Implemented Excel import and export features.
• Developed scheduled tasks for external SOAP and REST integration services.
• Dockerized the project and deployed it across different environments.
• Interviewed intern engineers and supported their training.
• Resolved branch conflicts during version control.
• Developed middleware for encrypting required request and response content.
• Implemented and integrated permission based authorization.

Deployment Information

• The project is an internal system used by companies within Yıldız Holding, so it is not publicly accessible.
• Users can access the platform only through the company's VPN connection.
• Deployments were performed on the company's on-premise CentOS servers.