Konstantinos Tzikakos
Verified Expert in Engineering
System Administrator and Developer
Athens, Greece
Toptal member since December 19, 2022
Konstantinos is a senior Linux system administrator with extensive experience in virtualization and web hosting environments, customer and technical support, and troubleshooting. He is proficient with cPanel, holds the WHM system administrator certification, and is passionate about technical documentation. Konstantinos is also experienced with ISO 27001 and GDPR best practices.
Portfolio
Experience
- Troubleshooting - 10 years
- Monitoring - 9 years
- Web Hosting - 8 years
- cPanel - 8 years
- Technical Documentation - 8 years
- Linux - 7 years
- DNS - 7 years
- SSL Certificates - 5 years
Preferred Environment
cPanel, DNS, Let's Encrypt, SSL Certificates, Technical Documentation, Web Hosting, Troubleshooting, Linux, Monitoring, PKI
The most amazing...
...thing I've created is some custom Apache-MySQL-PHP-FPM configurations in order to optimize hundreds of underperforming VMs, keeping their key customers happy.
Work Experience
Linux System Administrator L2
Hellenic Academic & Research Institutions Certification Authority (HARICA)
- Upgraded Ubuntu Server virtual machines to the latest long-term support (LTS) and migrated all services with zero downtime.
- Gained advanced knowledge of certificate authorities, CA/Browser Forum, digital certificates, and secure products.
- Updated any outdated documentation in the organization's wiki. Joined a network operations center (NOC) team.
Video Projection Mapper
Self-employed
- Worked actively with 3D projection mapping for indoor and outdoor installations, concerts, corporate events, and parties.
- Acted as a technician specialized in NDI and video over IP setups using MikroTik router boards and switches.
- Used Resolume Arena software and analog and mixed media projections.
Linux System Administrator L1 and L2
IpHost.net
- Joined the company as a member of L1 technical support and was promoted to the L2 system administrator in less than a year.
- Built a whole knowledge base from scratch to meet an end customer's needs, reducing incoming support tickets by 30%. Created technical documentation and guides for common tasks and procedures.
- Created a custom Apache-MySQL-PHP-FPM configuration for e-shops, saving over 400 virtual machines suffering from poor performance due to misconfiguration.
L1 and L2 Technical Support Team Lead
Wind Hellas Telecommunications
- Transitioned from L1 technical support to team lead for corporate technical support within the first year.
- Handled VIP and high-value customers' cases and provided customer care.
- Trained new L1 and L2 team members on our tools, procedures, and GDPR.
- Created detailed documentation for the technical team's procedures.
ICT Officer
Samaritan's Purse
- Managed all remote offices via Cisco Meraki managed routers and MikroTik switches and router boards and all devices via Cisco Meraki MDM.
- Supported 300+ staff members in seven different locations in Greece.
- Managed a 1,000+ inventory of the organization's ICT assets.
- Trained staff on the organization's ICT procedures.
Experience
Standalone Knowledge Base for a Web Hosting Company Embedded in Its Ticketing Platform
This project was entirely based on my input and technical writing. As a system administrator, I already had a clear overview of all incoming support tickets. The software used for the knowledge base is Atlassian's Confluence, combined with the existing Kayako ticketing platform, which enables the rest of the support team to use these items as ready-made macro responses to incoming support tickets.
This solution reduced incoming support requests by over 30% within the first six months of its launch and saved time for the team. If a customer sent a ticket covered by the knowledge base, the team replied with three clicks instead of writing a new guide from scratch.
DPO and Abuse Reports PoC
Some of the key responsibilities of a DPO:
► Advising the organization on data protection compliance matters
► Conducting data protection impact assessments (DPIAs)
► Responding to data subject rights requests
► Providing training on data protection to employees
► Coordinating with supervisory authorities on data protection issues
► Maintaining records of processing activities
► Acting as a point of contact for data protection authorities and data subjects
► Creating all the respective documentation and procedures
► Training staff members and helping with yearly audits as well as internal auditing
► Monitoring the organization's compliance with data protection laws and regulations
Bash Script to Change the Character Set in a MySQL Database
Education
Bachelor's Degree in Multimedia and Internet Technology
University of Salford - Manchester, UK
Certifications
cPanel & WHM System Administrator I Certification (CWSA-1)
cPanel
Skills
Libraries/APIs
Cloud-Init
Tools
Kayako, Apache, Let's Encrypt, Virtualmin, Cisco Meraki, Photoshop CS6, Illustrator CS6, Exim4, Postfix, Certbot, Keepalived, Open Broadcaster Studio (OBS), SpamAssassin, NGINX, Plesk, Jira, Rundeck, Zabbix, VMware, Nagios, Corosync, Shell, Confluence, Atlassian, Mailchimp, Microsoft Power BI, Git, GitLab, GitLab CI/CD, Ansible
Platforms
cPanel, Linux, CentOS, WordPress, Proxmox, RouterOS, Windows Server
Paradigms
Testing & Maintenance, Search Engine Optimization (SEO), Testing, Agile, DDoS, Penetration Testing
Industry Expertise
Cybersecurity
Storage
Database Security, MySQL, MariaDB, Redis Cache, Memcached
Languages
Bash, Bash Script, Markdown
Frameworks
Windows PowerShell
Other
Web Host Manager (WHM), DNS, Web Hosting, Technical Documentation, Troubleshooting, VoIP, ADSL, Helpdesk, Technical Support, General Data Protection Regulation (GDPR), Resolume, Projection Mapping, Graphic Design, W3 Total Cache, Test Documentation, Documentation, Technical Writing, Knowledge Bases, Tutorials, Writing & Editing, System Administration, SSL Certificates, Ubuntu Server, Hardware Troubleshooting, SSL, Networking, Access Points, MikroTik, FTTH, Cabling, VSAT, Software Troubleshooting, Inventory Management, ICT Training, NewTek NDI, 3D Video, Monitoring, IT Security, Web Security, Proofreading, Website Migration, Security, Risk Management, Quality Assurance (QA), ISO 27001, Security Policies & Procedures, Policies & Procedures Compliance, Architecture, Business Strategy, SMTP, Spam Filtering, Antivirus Software, IDS/IPS, TCP/IP, Systems Monitoring, Dovecot, Virtualization, NetBox, RackTables, Netdata, PKI, Digital Certificates, Digital Signatures, X.509 Certificates, PBX, Customer Support, Key Performance Indicators (KPIs), Procurement, Cloudflare, Wiki.js, Ethical Hacking, Optimization, Email Templates, Newsletter Templates, APIs, Online Certificate Status Protocol (OCSP), CloudLinux, ISO 9001, Training
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