Tahir Çakmak, PMP

Astrakid.co is a comprehensive online English tutoring platform. It was initially supported by third-party applications like Zoom, Calend.ly, and Google Forms and Sheets with simple PHP pages. Customer demands made it compulsory to invest in an integrated software platform for students.

I gathered requirements by communicating with internal team members and existing customers, modeled mind maps, developed a system design for high-availability capabilities, and transformed those inputs into a product backlog. I also evaluated the requirements, designed the system from top to bottom, and hired and managed the designer who created the UX in Figma.

We implemented the project with Flutter via Firebase, developed the back end with Node.js, stored the data in Firebase and PostgreSQL. I managed the project in Jira with Scrum methodology, including weekly sprints.

Additional Technologies
• Used Zoom Client SDKs for live communication and to avoid complexity.
• Used GitHub Actions for CI/CD to ensure quality.
• Deployed the UI to the App Store, Google Play, and Firebase Web Hosting.
• Deployed the back end on Google Cloud Run in a Docker container for serverless architecture.

I gathered requirements and analyzed legacy data structures, business rules, and algorithms from a 25-year-old COBOL and AS400 application that collected production specification data for producing tires through several sophisticated manufacturing machines. I redesigned the data model to accommodate complex business rules and simplified some of them by implementing the constraints in Oracle. I architectured the solution in C# with a domain model, guided the team to implement it, and refactored it for clean code whenever necessary to ensure quality by covering the business code with integrations tests.

I participated in Agile project management through the Kanban method and successfully delivered and replaced the existing application that was in place for 20 years with two failed attempts to replace it.

Morrisons UK is a long-term customer of Avolin Vision, using the platform to manage inventory and supplies for movie and game DVDs and books through several distributors, such as Universal Studios.

I managed the development of a React Native mobile application that integrates with the Avolin Vision inventory management product and allows clients to verify their inventory with a mobile device using their cameras as barcode readers. Customers can see the incoming goods and plan their next supply order.

I spearheaded the work of two developers, two testers, DevOps professionals, and 20 stakeholders through Scrum. I also took an active role in collecting requirements from product owners and project sponsors and designing a highly available AWS system.

We developed unique stakeholder management capabilities in the mobile application using Avolin's Vision Inventory Management product, making proper integration architecture and communication crucial. The mobile application was developed with React Native and delivered to the Google Play and App Store.

Ericsson executed the Jawwal OSS/BSS transformation project. Jawwal had a legacy Siebel CRM and old charging and billing applications. Ericsson proposed a program to upgrade to Ericsson Charging and Billing in One (CBiO) and replace the Siebel CRM with the Ericsson Telecom CRM product based on Microsoft Dynamics CRM 2016.

Our 10-member team was responsible for integrating the Telecom CRM to CBiO, developing new pages, and customizing out-of-the-box features for the client.

My role:
• Led the team in designing the C# architecture for the back end and the Dynamics CRM Plugin development
• Developed a testable architecture based on the ASP.NET Web API using the Microsoft Dynamics CRM SDK and a domain-driven design model
• Built an architectural design to re-use the same code in the Dynamics CRM Plugin along with the ASP.NET Web API with a Castle Windsor IoC container
• Coached the team regularly to write cleaner code, supported them in writing testable, dependency-inverted code, and encouraged them to write unit and integration tests
• Performed recurring code reviews and refactored the code to improve code coverage or reduce duplicates
• Deployed SonarQube and dotCover to monitor code quality and maintain the technical debt

I managed a team of five while developing a brand-oriented eCommerce solution for LC Waikiki with ASP.NET, WCF, and SQL Server. For this project, I built a complete system for inventory management to enable items to be added to the basket and assigned to the closest warehouse upon order completion. The company set up several warehouses across the country exclusively for this and signed contracts with 3PL companies.

As for the eCommerce development team, we provided two separate ways for 3PL companies:

• The first solution is a "bidding portal" for bulk transfers between warehouses. 3PL companies are registered to the portal and bid on proposals. Inventory managers accept one of the bids, and the winner initiates the transfer. The destination warehouse team confirms the delivery after the shipment is done.

• The second system was for order deliveries and worked through SOAP. The eCommerce system orders a customer shipment automatically through a SOAP service from the selected shipment provider for that warehouse. Every day, the selected 3PL company sends a shipment truck to collect each package to deliver to individual customers.