● Built the corporate IT and security perimeter from scratch for a fully remote team (150+ staff): Google Workspace, Cloud Identity, Slack, Atlassian, GitHub, Notion, Trello, VPN, DNS. ● Designed an identity and access workflow (Cloud Identity, SSO, RBAC) and standardised onboarding/offboarding, reducing the technical work per user to under 30 minutes. ● Optimised SaaS and VPN spend, delivering a one-off saving of $7,500 over the 70-day project and reducing the ongoing monthly budget by 19%.

● Sole DevOps engineer on a game development project (Unity / .NET). ● Optimised CI/CD pipelines (Ansible, Bash, TeamCity, GitLab Container Registry) for Unity / .NET applications. ● Implemented Infrastructure as Code for a heterogeneous (Windows, Linux, macOS) hybrid (AWS, GCore, Hetzner, DigitalOcean) infrastructure using Ansible and Terraform, cutting new environment provisioning to 20 minutes. ● Implemented a comprehensive monitoring stack (Prometheus, Grafana, Alertmanager), reducing MTTD and MTTR. ● Ensured secure connectivity and availability for globally distributed staff by deploying a corporate VPN (OpenVPN, WireGuard, Outline).

● Served as on-call L3 SRE on a high-load project, ensuring production infrastructure operations and incident resolution (diagnostics, recovery, escalations, post-mortems). ● Managed the monitoring stack (Prometheus, Grafana, Alertmanager). ● Ensured Infrastructure as Code (Ansible, Terraform) and GitOps practices (GitLab, Kubernetes, Helm, OpenShift, OpenStack) for application infrastructure.

● Implemented an end-to-end logging system (Elasticsearch, Logstash, Grafana). ● Administered high-load databases: MySQL source/replica, MongoDB sharded cluster, multi-node Elasticsearch cluster, PostgreSQL, Redis. ● Managed a comprehensive monitoring stack (Prometheus, Grafana, Zabbix) and logging stack (Elasticsearch, Logstash, Kibana). ● Developed and maintained CI/CD pipelines in GitLab CI (Docker, Ansible, Bash). ● Oversaw the migration of an application suite (LEMP, Kubernetes, Helm) to GCP cloud infrastructure (Compute Engine, Cloud CDN, VPC, Cloud SQL, Kubernetes Engine).

● Part-time concurrent role. ● Ensured high availability (SLA 99.9%) of VPS/VDS hosting infrastructure for LEMP projects. ● Implemented Zabbix monitoring and ensured incident resolution within SLA (up to 1 hour).

● Part-time concurrent role. ● Ensured uninterrupted operation of the MEAN project's VPS/VDS infrastructure. ● Automated CI/CD (GitLab CI, Docker, Bash). ● Implemented Zabbix monitoring and resolved incidents within SLA (up to 1 hour).

● Part-time concurrent role. ● Ensured uninterrupted operation of a LEMP project's VPS infrastructure. ● Implemented Zabbix monitoring and resolved incidents within SLA (within 1 hour).

● Sole DevOps engineer at a web studio (custom web development). ● Managed hybrid infrastructure for production and test environments: AWS (EC2, RDS, S3, IAM), Azure (Virtual Machines, Azure SQL, Redis Cache), Hetzner, DigitalOcean. ● Implemented and maintained CI/CD with GitLab CI (Docker, Ansible, Bash) for three teams, enabling weekly automated releases. ● Automated deployment of LEMP/LAMP/MEAN stacks with Ansible, provisioning a new environment within 35 minutes.

● Provided technical support to employees and maintained the company's heterogeneous IT infrastructure (Windows, Linux) for 10+ staff. ● Served as project manager for the corporate email newsletter project, responsible for quality and uninterrupted operation. ● Performed functional and regression testing of company websites (WordPress, Joomla, Drupal, Yii).

● Ran A/B tests and performed SEO optimisation, increasing organic search traffic by 21% and conversion by 7% in 3 months. ● Developed and optimised web pages (PHP, MySQL, HTML, CSS), coded email newsletters. ● Managed web-hosting infrastructure (DigitalOcean, Hetzner) and provided technical support to 30+ employees.

● Administered the in-house record-keeping system (InterBase, SQL, Delphi): backups, monitoring, schema and query optimisation. ● Ensured connectivity for 12 offices: VPN and failover across ADSL, 3G, 4G, and dial-up; 99.9% availability, failover in 4 minutes. ● Supported Windows infrastructure and 40+ users; average incident resolution time 37 minutes.

● Responsible for establishing and maintaining the bank's Information Security Management System (ISMS). ● Administered and maintained access control and video surveillance systems; conducted information security incident investigations. ● Oversaw compliance with National Bank of Ukraine information protection requirements as Information Security Administrator.

● Administered a heterogeneous (Windows, Linux) IT infrastructure (Microsoft Exchange, IIS) and networks (VPN, LAN, PBX). ● Ensured information security (Active Directory Group Policy, WSUS, MBSA, antivirus, incident analysis). ● Planned and executed the migration of 23 workstations to Ubuntu Linux, saving ~$2,000/year on Microsoft licensing. ● Managed IT vendor engagement, contract drafting, budgeting, and hardware/software procurement. ● Provided technical support to 60+ users.

● Led a 12-person IT department; ensured stable operations of the entire IT infrastructure (AD, Terminal Servers, File Servers, Windows, Debian Linux, Client-Bank, POS terminals, ATMs, Cisco) for 300+ users. ● Ensured close coordination with vendors and service providers; promptly resolved telecom and equipment outages. ● Ensured IT systems' compliance with National Bank of Ukraine information security requirements; passed two regulator audits with no material findings.

● Oversaw the rollout of Hypercom POS terminal networks across five major shopping malls (120+ cabling ports) as part of a merchant acquiring network expansion. ● Managed the infrastructure of the Client-Bank system (InterBase, Delphi) and supported 200+ corporate clients. ● Oversaw National Bank of Ukraine information security compliance as Information Security Administrator.

● Monitored and maintained the self-service network: 15+ Diebold ATMs and 150 Hypercom POS terminals, sustaining ≥99.9% availability per SLA. ● Supported IT infrastructure of 5 branches: workstations (Windows NT/2000/XP), LAN (3Com, HP, Cisco), peripherals. ● Provided technical support to 80+ employees.

● Part-time concurrent role. ● Administered Windows domain infrastructure (AD, File Server, Print Server, DHCP, DNS), VPN on CentOS Linux. ● Maintained ELSA, ETKA, and 1C applications: backups, updates, data recovery.

● Administered Novell NetWare and Novell servers for 50+ city branches (150+ employees); average recovery time 25 minutes. ● Ensured operation of HERZ (Firebird, Delphi) and ASVO (Clipper, dBase): daily synchronisations, backups, data recovery. ● Coordinated support of branch IT infrastructure: MS-DOS and Windows 98/NT workstations, networks, peripherals.

● Ensured operation of HERZ (Firebird, Delphi) and ASVO (Clipper, dBase): daily synchronisations, backups, data recovery; average recovery time 40 minutes. ● Supported branch IT infrastructure: MS-DOS and Windows 98/NT workstations, network, peripherals; closed L2 escalations within SLA. ● Performed component-level PC repairs: 83% of repairs completed within SLA (up to 2 business days).

● Ensured operation of the ASVO distributed database (Clipper, dBase): daily data exchanges, backups, data recovery; average recovery time 40 minutes. ● Supported MS-DOS and Windows 98/NT workstations: reinstallation, driver and network setup, software configuration; 89% of tickets closed within SLA. ● Performed component-level PC repairs: 83% of repairs completed within SLA (up to 2 business days).