Milan Jezdik, VMware ESXi Developer in Kuala Lumpur Federal Territory of Kuala Lumpur, Malaysia
Milan Jezdik

VMware ESXi Developer in Kuala Lumpur Federal Territory of Kuala Lumpur, Malaysia

Member since November 13, 2015
Milan is an experienced DevOps engineer with broad specialization in infrastructure (on-premise, cloud, or hybrid), virtualization, Linux, LAMP, databases, HA, BCP, and DR. He is a dedicated and focused individual, able to take on any infrastructure challenge.
Milan is now available for hire

Portfolio

  • PriceBlink
    Amazon Web Services (AWS), AWS, Rackspace, MySQL, PHP
  • One Door
    Amazon Web Services (AWS), PostgreSQL, Ruby, AWS
  • Claranet Group
    Juniper, Cisco, MariaDB, Puppet, Linux, VMware

Experience

Location

Kuala Lumpur Federal Territory of Kuala Lumpur, Malaysia

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Python, Ruby, PHP, Linux, AWS

The most amazing...

...project I've led was the relocation of 40+ full racks into a new location without an outage.

Employment

  • IT Consultant

    2016 - PRESENT
    PriceBlink
    • Fully upgraded a legacy stack (OS and app).
    • Migrated the system to AWS.
    • Transitioned to full SSL processing.
    • Oversaw the security of the infrastructure.
    Technologies: Amazon Web Services (AWS), AWS, Rackspace, MySQL, PHP
  • IT Consultant/System Administrator

    2016 - PRESENT
    One Door
    • Created a merchandising cloud - SaaS platform operational in multiple regions.
    • Built highly available and scalable AWS infrastructure.
    • Provided continuous integration and continuous delivery using Jenkins.
    • Implemented single sign-on (Okta, OneLogin).
    Technologies: Amazon Web Services (AWS), PostgreSQL, Ruby, AWS
  • Group IT Operations Manager

    2010 - 2015
    Claranet Group
    • Created and maintained secure/scalable/highly available IT/IS infrastructure supporting all group services and key shared hosting platforms.
    • Increased high availability of database servers (multi master replication).
    • Moved part of the physical infrastructure into a private cloud (VMware ESXi, Nutanix, 10gbps network).
    • Provided PaaS to development teams including automated tests and builds.
    • Configured a Juniper Firefly virtual firewall.
    • Created a log search tool allowing support teams to filter and process logs from a shared hosting platform.
    • Managed NetScaler VPX load balancer, including SSL certificates.
    • Provided GitLab instance to the all group members.
    • Managed a corporate website - BGP anycast cache domain (using Varnish) with LAMP back-end.
    • Upgraded puppet and used dynamic environments and automatic manifests propagation via r10k.
    Technologies: Juniper, Cisco, MariaDB, Puppet, Linux, VMware
  • Senior Systems Administrator

    2009 - 2010
    Claranet UK
    • Migrated three legacy shared hosting platforms onto a new multitenant platform.
    • Deployed a highly available database cluster (MySQL).
    • Upgraded servers running a legacy OS to the latest LTS versions.
    • Performed a security assessment of the infrastructure and platforms.
    • Rolled out new BGP any-cast DNS nodes around Europe.
    Technologies: Unbound, PowerDNS, Exim, MySQL, Ruby on Rails (RoR), Quagga, LAMP
  • Infrastructure Specialist

    2008 - 2009
    Boltblue International
    • Managed a mobile content delivery network (in-house CDN).
    • Migrated the whole infrastructure into AWS.
    • Created and validated disaster recovery procedures.
    • Created and managed business reports supporting marketing campaigns and sales team.
    • Worked with vendors on continuous service improvement (message delivery).
    Technologies: Amazon Web Services (AWS), Google, AWS, Apache, Apache Tomcat, Java, Oracle
  • Lead architect

    1998 - 2009
    Barda SW, HW, s.r.o.
    • Built a framework for SMS processing (meal ordering platform).
    • Wrote code for various automatic bank payment systems.
    • Wrote code to generate HACCP reports required by local legal entities.
    • Wrote code for direct debits processing.
    • Wrote code for online ordering via web portal (PHP).
    • Managed Linux infrastructure to support the business.
    • Worked on ID cards management and processing.
    Technologies: Visual FoxPro, Java, Apache, PHP
  • Systems Administrator

    2006 - 2008
    Sport Media Group - Go Content Ltd.
    • Optimized database schema and indexes for the internal CMS.
    • Upgraded and consolidated the DNS platform (BIND).
    • Implemented IT policies (configuration, release, and incident management).
    • Built a highly available network infrastructure in two distant sites.
    • Delivered a news letter mail platform.
    Technologies: Iptables, Apache Tomcat, PostgreSQL, BIND9, BIND 9, Apache, Java
  • Web and WAP Systems Administrator

    2005 - 2006
    T-Mobile Czech Republic a.s.
    • Managed network and application load balancers with SSL offload.
    • Managed the primary customer portal - T-Zones - J2EE, Tomcat, Apache.
    • Managed WAP Gateway for all T-Mobile customers (OpenWave MAG).
    • Implemented Oracle directory service (LDAP).
    • Directly involved in the roll out of the first Unified Messaging service in Europe (Paegas Click service).
    Technologies: WebSphere, Oracle, Apache Tomcat, Apache

Experience

  • Data Center Relocation

    Based on a business decision to close one of the main DC sites in the UK, I had to power off and relocate 40+ racks and all related services to a new site.

    My role was to prepare a high level and detailed relocation plan for all services (100+). I was also responsible for actioning the plan together with my team (four engineers). I was in charge of designing, purchasing, and delivering of the new infrastructure, relocation of the services, working closely with service owners and changing the team. I had to manage my team to split the project work and the BAU work in order to keep on track with the tight schedule. I am proud I managed to vacate the old DC site in less than nine months and the project delivered a new, completely virtualized, resilient, secure, scalable, and power efficient infrastructure providing high availability and resiliency to all relocated services.

    The new site is using a hyperconverged infrastructure (Nutanix + VMware) running on a 10gbps network (Cisco, Dell, Juniper, Citrix).

  • DR Site

    I was tasked to build a new DR site in a distant location which would support Claranet Group Business Continuity Plans.

    I was in charge of the design, purchasing, and delivering of the new geographically dislocated DR site in one of the Claranet's data centers in Germany. I managed to prepare the whole site remotely with only a little help from the local DC team (patching and configuring the remote access cards on the blades).

    The DR site is fully virtualized including the networking (Cisco CSR, Juniper Firefly and Cintrix NetScaler VPX). The project delivered DR plans and HA solutions (in active-active mode where possible) for business critical applications such as Exchange, Lync, internal CRM, and customer portals.

  • Infrastructure Move to AWS

    Based on the cost analysis, a decision was made to virtualize the whole Boltblue Ltd. infrastructure into Amazon AWS cloud. I was tasked with preparation of the new AWS environment and move of the physical infrastructure into the cloud. One of the most challenging tasks on this project was to migrate an Oracle 10i 32bit instance into the 64bit virtual environment. This project is utilizing AWS services such as EC2 and S3. CentOS based images running Java/Apache/Tomcat application stack

  • Architecture Update

    Conversion of the PHP source code and underlying operating system into supported (LTS) versions of PHP and OS.

    The migration required testing and cooperation with the development team.

    While working on the transition, I also automated the server build process and deployment (CI/CD).

Skills

  • Languages

    Bash, Ruby, Java, Visual FoxPro, Python, HTML, PHP, CSS
  • Libraries/APIs

    Puppet.js, AWS EC2 API, Redis Queue
  • Tools

    Jenkins, AWS CloudWatch, AWS SES, Chef, Apache, AWS ECS, AWS CLI, AWS ELB, Terraform, Nagios, Zabbix, Apache Tomcat, VMware, Varnish, Nginx, Squid Proxy Server, Puppet, Quagga, Unbound, Kibana, Logstash, Passenger, Ansible
  • Paradigms

    DevOps
  • Platforms

    AWS EC2, Amazon Web Services (AWS), Linux RHEL/CentOS, Percona, FreeBSD, LAMP, Oracle, WebSphere, Rackspace, Linux, Windows
  • Storage

    AWS S3, Memcached, PostgreSQL, MySQL, MySQL/MariaDB, MariaDB, MongoDB, Redis
  • Other

    Load Balancers, HAProxy, HTTPS, HTTP, SMTP, DNS, VMware ESXi, Iptables, BIND9, BGP, UDP, TCP/IP, IMAP, AWS, Cisco, Juniper, Exim, PowerDNS, Google, BIND 9
  • Industry Expertise

    Security
  • Frameworks

    Ruby on Rails (RoR)

Education

  • Bachelor's degree in Information Technology
    2002 - 2005
    University of Technology Brno - Czech Republic

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