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Project Type

• The project is a backend web application.
• It was developed with .NET Framework 4.8.

Architecture / System Design

• The project contains three main layers: internal backend, external backend, and database.
• The internal backend and external backend have similar structures.
• Both backend applications primarily access the database layer.
• MongoDB is used for the database layer.
• The internal application is published on IIS servers.
• The external application is published on CentOS based Linux servers.

Technologies Used

• Backend: C#, .NET Framework 4.8
• Database: MongoDB
• Logging and file processing: NLog, CsvHelper
• Authentication: Keycloak
• Deployment and infrastructure: CentOS, IIS
• Version control: Git, GitLab

Key Technical Details and Modules

• Logged email sending operations with NLog and CsvHelper.
• Provided authentication support through Keycloak.
• Stored email sending content on MongoDB.
• Handled email sending operations through a runtime-created queue.

Participation and Timeline

• The project is used by companies within Yıldız Holding for email sending operations and was supported by ID3.
• I worked on the project for approximately one year, between April 2024 and March 2025.

Project Management / Team Structure

• The project was supported by the Sharks application development team within ID3, which was responsible for Yıldız Holding projects.
• I worked in the Sharks team as a Software Development Specialist.
• I joined an existing long-running project rather than starting from scratch.
• Two developers from the Sharks team, including me, supported this project.
• The team followed an Agile methodology.
• Customer requests were converted into tasks on Jira.
• Daily planning and work distribution were 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 successful results and approval.
• I managed the deployment process.
• There was also a four-person Product Owner team on the customer side.

Personal Contributions and Responsibilities

• Implemented authentication flows using authentication information provided by Keycloak.
• Logged successful and failed email sending operations with CsvHelper.
• Deployed the applications on both Windows / IIS and Linux / CentOS servers.

Deployment Information

• The project is an internal and external system used by companies within Yıldız Holding, so it is not publicly accessible.
• Companies can access the platform only with the authentication information provided by the company.
• Deployments were performed on the company's on-premise CentOS servers and Windows-based IIS servers.