Şefik Şahin Email & Phone Number

Turkey

Ensuring the operation of the Precheckout domain, Catalog, Product, and Stock in two modes: country-based multi-tenant and multi-instance, while deploying and managing them through Kubernetes, and the deployment of E-commerce in other countries, along with performance measurement.Determining and coding the architectural structure and data structure modernization of the Favorite domain, transitioning from MSSQL to Couchbase, developing a microservice running on .NET Core, and ensuring that Product and Stock data are hosted and operated on their ownDetermining the architecture of the search and product listing personalization infrastructure, coding the integration of personalization into the Catalog system, conducting performance tests using JMeter, coding, and distributing tasks to teams to track progress.Implementation and deployment of the LCW framework with pars.Core Caching and Couchbase integration, coding the MemoryFirst Redis pub-sub caching mechanism and integrating it into the framework, customizing the open-source Linq2Couchbase library, adding a mechanism to prepare and execute generated queries in Couchbase rather than querying the library for each dynamically written lambda query, and implementing the pars.Core integration.

Istanbul, Turkey

Developed an LCW Search & Dynamic Filters Engine by using ElasticSearch with the C# ElasticSearch Driver, while disabling Google search support.(CMS) Developed a Dynamic Menu Tree designer capable of functioning on both responsive and desktop browsers, utilizing technologies such as C#, WCF, JavaScript, and jQuery and MSSQL.A Product Tag Management System has been developed based on dynamic rules using Elasticsearch to manage campaign products, incorporating technologies such as .NET Core, RabbitMQ, Razor Pages, JavaScript, MSSQL, Elasticsearch, CQRS, and an Event-Driven architecture.Modernized the WCF search service, now named the Catalog microservice, by transitioning to a .NET Core foundation. This included enhancing its technology stack, refining the code structure, and integrating various technologies and coding patterns such as Elasticsearch, C#, Painless Scripting, Entity Framework Core, Event-Driven Kafka, Couchbase Transactional Inbox Pattern, Chain of Responsibility, CQRS, Strategy Design Pattern, and Factory Design Pattern. Additionally, unit tests.Developed a Product Microservice, moving the database from MSSQL to Couchbase with a document-based structure. This change allowed for product data distribution across the e-commerce system via Kafka. Used: .NET Core, C#, Couchbase, Kafka, Transactional Outbox Pattern, CQRS, Decorator Design Pattern, N1QL Couchbase, unit tests.Developed a Stock Management System for e-commerce from scratch. All stock data from various warehouses was migrated to Couchbase with a predefined document structure. Materialized Views and Couchbase's Eventing separated stock operations for writes and reads. Stock movements were exposed to e-commerce domains via Kafka using Couchbase Kafka Connector. Technologies used: .NET Core, Kafka, Connector, Couchbase, C#, JavaScript, Optimistic Locking, CQRS, Event Sourcing, Chain of Responsibility, Visitor Design Pattern, Decorator Design Pattern, Idempotency Mechanism, and unit test.

Istanbul, Turkey

- Designed, analyzed Web Api Restful Service for entegration system(.NET, ASP.NET WEB API, C#, EntityFramework,Repository Design Pattern)- Designed, analyzed Logistic Tracking System for managing Colin’s,Loft,Mexx all logistics process to world wide.(Asp.NET MVC, C#, Telerik UI Technology,Jquery, Factory Design Pattern)- Designed, analyzed OAuth 2 Authorization Server (C#, JavaScript)- Design and analyzed Database shema and procedure,function,view to database(MS-SQL)

İstanbul, Türkiye

-Designed, analyzed Web Application Restful Service(.NET, ASP.NET,C#,TypeScript,Angularjs 2, NodeJs)-Designed, analyzed Tulpar Web Client which will be reported situation of ENB, LTE and Cell (VSCode,TypeScript,NodeJs,Angular 2, OAuth 2)-Designed, analyzed OAuth 2 Authorozation Server(C#,Javascript)-Experience with Database Management Systems(Oracle Toad)

4.Levent

-Designed, analyzed Web Application (.NET C# and ASP.NET)-Designed, analyzed Chat Application. WEB CHAT (ASP.NET MVC)-Experience with Database Management Systems(MSSQL 2008),-Chat Application developments with MVC 5.0 Razor, SOAP and JSON WCF Web Services,Javascript, JQuery, Ajax,Web Socket with SignalR-Development proactive chat feature with applying rule accordingly.