Selahattin Ceylan

• Company building test system env for QAs.I'm working on controlling Apple phones and tablets over the web.They said their current code is not working properly.I was going to make a bugfix, but when I entered the project, I liked it and I wrote their all system
• Developed RESTful APIs that facilitated seamless data exchange between clients and servers in a distributed environment.
• Optimized code performance by implementing efficient algorithms and data structures.
• Refactored legacy codebase for modernization, improving readability, extensibility, and performance of existing features.
• Built APIs and data clients to consume APIs.
• Contributed to open-source projects, bolstering personal expertise while giving back to the developer community.

• CAT it is an outsource company because of that the work we do is changing by projects
• I worked in 4 projects. I can't give spesific informations about project due to agreement
• Collaborated with cross-functional teams to deliver high-quality products on tight deadlines.
• Contributed to a positive team environment through effective communication, problem-solving, and collaboration skills.

BiTaksi is a taxi call application. I was on the passenger side. I worked in 5 microservices. I was main committer for 5 project.

1- Gateway: It is a gateway used bu all passenger services. It also works as BFF(backend for frontend)

2- GetirDrive: It contains the logics of bi-araç(getir-araç,moov) project. I wrote about 75% of this project. Rest communication with mostly Getir and Moov's services.

3- Location: It was a project with tasks such as finding an address from a location, finding a location from an address

4- Routing: It had the task of calculating the min route between 2 points and giving it to the client in the relevant format

5- Payment: Responsible for receiving payments by using services such as masterpass, bkm (Pre-auth,Postauth,direct-payment)

Used techs: kafka,redis,mongo,fiber,google map, yandex map, osrm

• Managed efficient SQL queries and data transport.
• Built APIs and data clients to consume APIs.
• Integrated third-party APIs from external applications into web platforms.
• Developed RESTful APIs that facilitated seamless data exchange between clients and servers in a distributed environment.

• I teach in the field of networking in the university community
• I am responsible for the education unit
• I am responsible for the planning and implementation of the trainings to be given
• Giving lectures on searching for vulnerabilities in the network layer

• Fundamentals of Go
• OOP with Go
• Clean Code
• Design Patterns
• Advanced Go
• Software Architecture
• Microservices
• DDD & EDD
• Web Applications with Go
• REST API with Go
• Databases, Database Programming with Go
• SW Quality
• Testing and TDD
• Unit Testing with Go

• Research and usage of open source tools.Afterwards, it is presented to the developers as a document
• Making backend tests via postman and keeping it in a sustainable system(because there was no mock database and test code )
• Testing the mobile application
• Web application testing
• In Go: Channels: For sending network packets to specific channels
• Goroutines: For multithreading
• DBs(redis,influxdb,mysql)
• Gopacket: For creating and analyzing network packets, then reject or pass packets
• Factory pattern mostly
• Microservices
• Rest API
• Unit Testing & TDD

• Learning Unix and OpenBSD, Learning go, Learning client-server architecture, Understanding token logic using JWT, Using fasthttp as HTTP server