Mustafa Kubilay Yalniz, Developer in Istanbul, Turkey
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Mustafa Kubilay Yalniz

Verified Expert  in Engineering

Linux Server Administration Developer

Istanbul, Turkey
Toptal Member Since
April 3, 2019

Mustafa has more than 20 years of experience in systems and software deployed on Linux platforms. He has extensive scripting/coding experiences both as a systems and software engineer. He has solid skills in DevOps, SaaSOps, and Linux systems engineering.


Amazon DynamoDB, Amazon RDS, Redis Cache, Python 3, Terraform, PostgreSQL...
Amazon Web Services (AWS), Amazon EC2, Identity & Access Management (IAM)...
Cassandra, Spark, Hadoop, Apache Ambari, Nexus, Red Hat Linux, Ubuntu, Linux...




Preferred Environment

Amazon Web Services (AWS), Terraform, Docker, Ansible, Linux

The most amazing...

...thing I've designed and implemented was a CDN using Varnish and Nginx to handle huge traffic of biggest busy internet newspaper in Turkey.

Work Experience

Senior DevOps Engineer

2021 - 2021
  • Created provisioning of Sandbox and external environments with Python, Bash, Terraform, Helm, Helmfile, Rails. The whole environment operations are managed with infrastructure pipelines.
  • Did release management with GitHub actions and JavaScript. Interacted with GitHub, Jira, and Slack while executing workflows.
  • Worked on various assignments including Datadog, TeamCity, Python, Kubernetes, Bash, Sentry, Helmfile, and Helm.
Technologies: Amazon DynamoDB, Amazon RDS, Redis Cache, Python 3, Terraform, PostgreSQL, Amazon EC2, Amazon Virtual Private Cloud (VPC), AWS ELB, AWS ALB, AWS NLB, GitHub, GitHub Actions, Node.js, Jira, TeamCity, Kubernetes, Helm, Helmfile

Site Reliability Engineer

2020 - 2020
  • Provisioned whole AWS environments with Terraform scripts including all aspects of networking and security.
  • Used AWS resources including AWS Autoscaling, AWS ECS, AWS Fargate, IAM, RDS, Elasticache, and Elasticsearch in deployments.
  • Implemented pipelines in circleci for infrastructure deployments.
Technologies: Amazon Web Services (AWS), Amazon EC2, Identity & Access Management (IAM), Ruby on Rails (RoR), Ruby, Amazon ElastiCache, Relational Database Services (RDS), Autoscaling, AWS Elastic Beanstalk, Terraform, Security, Networking

Senior DevOps Engineer

2019 - 2020
  • Set up a Cassandra data cluster with Ansible and Bash.
  • Set up a computing cluster (Ambari, Spark, Hadoop) with Ansible.
  • Set up ELK and scripts to push data to logstash.
  • Set up ELK beats on the data and compute clusters.
  • Prepared Perl, Bash, and Python scripts for automation and data retrieval.
  • Set up AWS resources for a computing cluster with Terraform and ready for Ansible.
  • Managed git repositories and pipelines in bitbucket.
  • Set up Apache Airflow jobs to cleanup logs.
  • Managed AWS Resources.
Technologies: Cassandra, Spark, Hadoop, Apache Ambari, Nexus, Red Hat Linux, Ubuntu, Linux, ELK (Elastic Stack), Perl, Bash, Terraform, Ansible

Senior Site Reliability Engineer

2019 - 2019
  • Provisioned and managed infrastructure with Terraform, Ansible, and Jenkins.
  • Set up and managed VMWare SDDC in AWS with NSX and storage.
  • Migrated L&S servers from legacy datacenter to AWS VMWare.
  • Reconfigured Lifted Centos Linux servers.
  • Set up and managed Elasticsearch, Logstash, Kibana stack.
  • Set up CI/CD pipelines and implemented GitOps.
  • Created Docker images and managed Docker containers and images in DTR.
  • Set up and managed AWS resources.
Technologies: Amazon Web Services (AWS), GitOps, Continuous Delivery (CD), Continuous Integration (CI), Git, Linux, ELK (Elastic Stack), Python, Amazon EFS, Amazon EC2, SDDC, VMware

Senior SaaSOps Chief Architect

2018 - 2019
  • Provided system administration of Atlassian Jira in AWS(using EC2 and RDS ).
  • Oversaw application administration of Kubernetes on legacy and AWS.
  • Optimized Atlassian Jira with more than 4000 users and a huge number of schemes and automations.
  • Managed Linux web server installations.
  • Created and maintained deployments with Ansible and Docker.
  • Setup and Manage AWS Resource.
Technologies: Amazon Web Services (AWS), Git, Ansible, Kubernetes, Docker, PostgreSQL, Amazon Aurora, MySQL, Linux, Jira

Senior Systems Engineer for Web Applications

2010 - 2019
Ciner Media Holding (haberturktv, showtv, bloomberght)
  • Managed Linux, Nginx, PHP-fpm, MySQL stack.
  • Installed, configured, and managed various open source software on Linux.
  • Set up CDN with varnish and nginx.
  • Generated RPM packages for custom installations.
  • Configured and managed MySQL replications.
  • Advanced bash and Perl scripting for systems engineering.
  • Monitored with Cacti, Nagios, and Zabbix.
  • Configured Nginx with Memcache and Redis.
  • Installed and managed software on Tomcat.
  • Initiated use of puppet for linux systems settings.
  • Set up multiple HDFS.
  • Implemented Hadoop MapReduce for some data processing.
  • Developed php web applications.
Technologies: Puppet, Squid, Cacti, Memcached, Redis, HAProxy, Varnish, MySQL, PHP-FPM, NGINX, Linux

Senior Lab Engineer

2017 - 2018
Optiva Inc.
  • Managed source control repositories Git, SVN, and Clearcase.
  • Managed CI/CD.
  • Managed telecom installations.
  • Scripted with Perl, Bash, and Python.
  • Maintained system and software on linux and solaris systems.
Technologies: Amazon Web Services (AWS), NGINX, Apache Tomcat, Apache, Bash, Perl, Artifactory, Jenkins, IBM Rational ClearCase, Subversion (SVN), Git, Linux

Senior Linux Systems Engineer

2015 - 2016
  • Led Linux systems engineering.
  • Created Docker images and containers with Docker and Docker-compose.
  • Contributed to TDD with Ruby on Rails.
  • Managed company resources in AWS.
Technologies: Ruby on Rails (RoR), Bacula, Docker Compose, Docker, Linux

Team Lead and Systems/Software Engineer

2009 - 2010
IBM Business Services
  • Developed IBM Tivoli Maximo java application.
  • Administered Oracle database.
  • Administered IBM Websphere.
Technologies: IBM WebSphere, Java, Oracle, IBM Maximo, IBM Tivoli

Senior Systems Engineer

2004 - 2009
Audatex Systems GmbH/Solera Inc. (Zurich, Switzerland)
  • Developed and deployed Java web applications.
  • Installed and maintained software on Oracle Application Server 10g.
  • Led Java web application performance tuning and capacity planning.
  • Created infrastructure for customer billing.
  • Installed and configured almost all industry standard software/tools on Linux systems.
Technologies: LoadRunner, Apache JMeter, Apache, Java, Bash, Perl, MySQL, Oracle, Linux

Web Application Developer

2003 - 2004
Innopark AG(Winthertur, Switzerland)
  • Wrote web application VIP.
  • Contributed to systems engineering.
Technologies: Java, Cocoon, Apache, SUSE, Linux

Software Designer

2000 - 2003
724 Solutions, Inc. (Lenzburg, Switzerland)
  • Implemented Tomcat Gateway for a wireless internet server.
  • Implemented example use cases to customers.
  • Maintained and Improved software configuration utilities.
  • Implemented voice adapter component.
  • Converted proprietary iScript to JavaScript.
  • Ported, deployed and maintained software on linux, solaris, hp-ux, tru64 platforms.
Technologies: JavaScript, Tcl/Tk, Linux, Java, C++, C

Research Engineer and Assistant

1996 - 1999
Computer Vision Research Lab-BUPAM
  • Studied in the area of Implicit Polynomials for Object Recognition.
  • Contributed to software engineering with C, C++, and Matlab.
  • Completed research in computer vision.
Technologies: MATLAB, C++, C

Sandbox and Production Line External Environments with Python and Terraform

The AWS resources like Redis, RDS Postgres, Secrets, DynamoDB, and Kubernetes. resources provisioned with one click or via CI/CD job. They are also managed with a Python wrapper for scheduled cleanup, extension, or deletion.

GitHub Workflows with JavaScript and GitHub Action

The whole release workflow has been implemented in GitHub with GitHub Actions and JavaScript code invoked via GitHub Actions.
The release train has been implemented to create and manipulate branches and pull requests and merge them properly. The JavaScript also manipulates Jira issues or creates and transitions them.
1997 - 1999

Master of Science Degree in EECS

Bosphorus University - Istanbul, Turkey

1992 - 1996

Bachelor of Science Degree in EECS

Bosphorus University - Istanbul, Turkey


HashiCorp Certified: Terraform Associate (002)



AWS Certified SysOps Administrator - Associate



Senior Site Reliability Engineer Bootcamp

An Online Freelance Agency


Courses in Systems and Technology Management

ETH Zurich



Linux Professional Institute


Various courses in IT

Technische Berufsschule Zurich, Switzerland


Various courses in IT

Universität Bern


German Language Proficiency

Language School in Wettingen Aarau Switzerland


Cocoon, Nginx-rtmp, RADIUS, Node.js


NGINX, Jira, Apache JMeter, Monit, Apache, Apache Tomcat, Varnish, Squid Proxy Server, PHP-FPM, Docker Compose, ELK (Elastic Stack), LoadRunner, MATLAB, IBM Tivoli, IBM Maximo, Cacti, Squid, Subversion (SVN), IBM Rational ClearCase, Artifactory, VMware, Amazon ElastiCache, AWS ELB, Ansible, Terraform, Git, Jenkins, Puppet, Apache Ambari, Iptables, pfSense, Apache Airflow, Amazon Elastic Container Service (Amazon ECS), AWS Fargate, AWS IAM, Amazon Elastic Container Registry (ECR), Helm, GitHub, Amazon Virtual Private Cloud (VPC), TeamCity, Helmfile


Perl, Bash Script, Tcl/Tk, JavaScript, Bash, Ruby, PHP, C, C++, Java, Python, Python 3


Linux, CentOS, Ubuntu, Linux RHEL/CentOS, Amazon EC2, Docker, Amazon Web Services (AWS), IBM WebSphere, Red Hat Linux, Nexus, Oracle, Kubernetes, Solaris, AWS Elastic Beanstalk, AWS ALB, AWS NLB


DevOps, Continuous Integration (CI), Continuous Delivery (CD)


MySQL Server, MySQLi, MySQL/MariaDB, Memcached, MySQL, Redis, SUSE, Amazon Aurora, PostgreSQL, Amazon EFS, Cassandra, VSFTPD, Amazon S3 (AWS S3), HDFS, Elasticsearch, Amazon DynamoDB, Redis Cache


Ruby on Rails (RoR), Spark, Ruby on Rails 4, Hadoop, Apache Spark


HAProxy, System Administration, Linux Server Administration, AWS DevOps, GitOps, Bacula, SDDC, Networking, Security, Relational Database Services (RDS), Identity & Access Management (IAM), ProFTPD, Apache Cassandra, Ubuntu Server, IT Networking, Autoscaling, Autoscaling Groups, Amazon RDS, GitHub Actions, Site Reliability Engineering (SRE)

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