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Selçuk Cihan, Software Developer in Istanbul, Turkey
Selçuk Cihan

Software Developer in Istanbul, Turkey

Member since September 24, 2018
Selcuk is a polyglot technologist with a focus on scalable backend services in the web ecosystem. As an ex-Amazonian, he crafts solutions by putting the customer first and ensuring operational excellence. Comfortable taking on work in any tech stack - though Serverless, Java, and Python have been a recurring theme in the past few years for him. Selcuk holds bachelor's and master's degrees in computer science.
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Portfolio

  • Toptal client
    Amazon Web Services (AWS), AngularJS, Python, Serverless, AWS
  • Amazon
    Amazon Web Services (AWS), Docker, JavaScript, Elasticsearch, PostgreSQL...
  • Intertech
    DevOps, JavaScript, Unit Testing, Agile, REST, Elasticsearch...

Experience

Location

Istanbul, Turkey

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Serverless, AWS, Unix, Python, React, Node.js

The most amazing...

...project I've done is migrating from SQL to a managed NoSQL database without down time, involving three different services and over 20 different clients.

Employment

  • Software Developer

    2018 - 2019
    Toptal client
    • Created a public-facing web application with a serverless framework.
    • Created a serverless back end in Python on AWS Lambda and API Gateway.
    • Developed and maintained the front end, implemented with AngularJS.
    • Optimized the cost resulting in more than 50% saving on the AWS bill.
    • Mentored developers and reviewed pull requests.
    • Improved performance by reengineering caching on CloudFront/S3.
    • Created serverless workflows using AWS Step Functions to integrate with external services.
    Technologies: Amazon Web Services (AWS), AngularJS, Python, Serverless, AWS

  • Software Development Engineer

    2017 - 2018
    Amazon
    • Developed and maintained the orchestration platform that processes Amazon’s catalog updates. The platform is able to handle tens of thousands of TPS, enabling the finest and largest catalog on earth. Uses Kinesis as the backbone and routes updates to the catalog to relevant downstream services.
    • Added further functionality to a Node.js service which is a high TPS REST service for diff analysis.
    • Refactored an orchestration engine which consumes Kinesis and calls downstream services such that the application can be started without any dependencies, thus enabling performance testing of the core.
    • Supported the reconciliation engine (Java 8) that generates the retail catalog.
    • Carried out live migrations of several web services without downtime. Successfully deprecated multiple legacy services in an effort to simplify the overall architecture and enable catalog growth.
    Technologies: Amazon Web Services (AWS), Docker, JavaScript, Elasticsearch, PostgreSQL, DevOps, Agile, Spring, Linux, Node.js, AWS, Perl, Java

  • Senior Software Engineer

    2013 - 2017
    Intertech
    • Supported the workflow engine (C#, Windows service) serving banking applications such as loans, customer complaints etc.
    • Set up elastic to index workflow engine documents, enabling powerful search mechanisms for the end user.
    • Designed and implemented a workforce management system that empowers the bank's operation center. The application uses Microsoft's solver foundation to solve the task assignment problem. This project got an award: https://www.bai.org/globalinnovations/awards/2017-winners/2017-internal-process-innovation-award.
    Technologies: DevOps, JavaScript, Unit Testing, Agile, REST, Elasticsearch, Microsoft SQL Server, C#, .NET

  • Senior Software Engineer

    2011 - 2013
    Ziraat Teknoloji (formerly Fintek)
    • Designed and implemented workflow engine running on top of Oracle, serving over 100,000 workflow instances daily.
    Technologies: Oracle, Windows Presentation Foundation (WPF), WinForms, C#, .NET

  • Software Engineer

    2010 - 2011
    AirTies Wireless Networks
    • Implemented Teletext for the IPTV set-top box using C++.
    • Developed a subtitle parser in C.
    • Implemented a high-performance transport stream parser in C.
    Technologies: Perl, Python, IPTV, RTSP, Linux, BusyBox, C++, C

  • Software Engineer

    2009 - 2009
    CC Yazılım
    • Designed and implemented a cross-platform desktop client in C++ utilizing wxWidgets GUI toolkit. The client database is SQLite.
    • Designed and implemented the corresponding backup server in Java (J2SE). An application-level protocol is implemented for client-server communication, secured via SSL (OpenSSL). Stored files are encrypted (AES).
    • Designed (visual design excluded) and implemented a web portal for serving online backup users. Users can download/browse backed up files through the portal. MySQL, Apache web server, and django framework are utilized.
    Technologies: SQLite, Apache HTTP Server, MySQL, OpenSSL, wxPython, Django, Python, wxWidgets, C++, Java

Experience

  • Twitter Friends Map
    https://twheat-map.selcukcihan.com/

    A side project that displays the locations of the people you follow on Twitter. The front end is written with React, the back end is serverless on AWS with Node.js runtime.

  • Tetris with React
    http://tetris.selcukcihan.com/

    Simple Tetris game built with React.

  • xface-j
    https://github.com/selcukcihan/xface-j

    This is a Java port of XFace 3D talking head library http://xface.fbk.eu/

    It uses OpenglES and can render a face composed of 2K polygons with a frame rate of 25 FPS.

  • Sensors Android App

    This is a simple application that shows readings from various sensors on a mobile phone.

    See https://github.com/selcukcihan/sensors for the source code.

  • Medical Test Results Android App

    This application displays medical test results performed in Istanbul Turkey in state hospitals.

    See https://github.com/selcukcihan/tahlil for the source code.

  • TeknoSeyir Android App

    This application shows videos from a popular technology vlog in Turkey.

    See https://github.com/selcukcihan/teknoseyir for the source code.

  • Parallel Max-flow Implementation
    https://github.com/selcukcihan/parallel-maxflow

    This is from my MS thesis and is a parallel heuristic max-flow algorithm implemented in C.

  • SQS Sample Code
    https://github.com/selcukcihan/sqstutorial

    This is a very simple demonstration of AWS SQS implemented in Java.

  • RDS Sample Code
    https://github.com/selcukcihan/rdstutorial

    This is a minimalist web service implemented in Java using spring boot and backed by AWS RDS.

  • Name Wizard Android App

    This is an application I developed in my free time which suggests names for babies.

    See https://github.com/selcukcihan/namewizard for the source code.

Skills

  • Languages

    PHP, JavaScript, Java, SQL, Python 3, Python 2, C#, Perl, Python, C++, C, TypeScript

  • Libraries/APIs

    REST APIs, Node.js, React, WinForms, wxWidgets, OpenSSL

  • Tools

    AWS CloudWatch, Amazon SQS, Amazon Cognito, AWS IAM, AWS CloudFormation, AWS Step Functions, BusyBox, wxPython, Apache HTTP Server, Pytest

  • Paradigms

    Unit Testing, DevOps, Agile, Jamstack, REST

  • Platforms

    Amazon EC2, AWS Kinesis, Linux, Docker, AWS Lambda, Unix, Oracle, Amazon Web Services (AWS)

  • Storage

    AWS DynamoDB, Amazon S3 (AWS S3), NoSQL, PostgreSQL, Oracle SQL, Microsoft SQL Server, Elasticsearch, MySQL, SQLite, MongoDB

  • Frameworks

    Django, Spring, Serverless Framework, .NET, Windows Presentation Foundation (WPF), AngularJS, Jest

  • Other

    AWS API Gateway, AWS, Serverless, RTSP, IPTV, Tox

Education

  • Master's Degree in Computer Engineering
    2008 - 2010
    Bogazici University - İstanbul, Turkey
  • Bachelor's Degree in Computer Engineering
    2003 - 2008
    Bogazici University - İstanbul, Turkey

Certifications

  • AWS Certified Developer - Associate
    SEPTEMBER 2019 - SEPTEMBER 2022
    Amazon Web Services (AWS)
  • AWS Certified Solutions Architect - Associate
    SEPTEMBER 2019 - SEPTEMBER 2022
    Amazon Web Services (AWS)
  • AWS Certified Cloud Practitioner
    JUNE 2019 - JUNE 2022
    Amazon Web Services (AWS)

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