Denis Harchenko Email & Phone Number

Ukraine

Kyiv, Kyiv City, Ukraine

Managed the deployment and configuration of blockchain nodes, including Ethereum, Tezos, and Casper, ensuring high availability and performance.Implemented CI/CD pipelines using GitLab CI/CD to automate the deployment process and streamline software delivery.Utilized Docker for containerization and orchestration of blockchain applications, improving scalability and resource utilization.Designed and maintained monitoring solutions using Prometheus and Grafana to track system health, performance metrics, and network activity.Collaborated with development teams to optimize smart contracts and decentralized applications (DApps) for performance and security.Conducted regular security audits and implemented best practices to protect blockchain networks against vulnerabilities and cyber threats.Provided technical support and troubleshooting for issues related to blockchain infrastructure, network connectivity, and system performance.Contributed to the development of internal tools and scripts to automate repetitive tasks and enhance operational efficiency.

Web Servers: Install, configure and maintain NGINX servers for high performance and security.Experience with installing and configuring Apache servers for website hosting.Reverse proxies and proxy servers: Skills in configuring reverse proxies using NGINX for load balancing and fault tolerance.Experience with configuring HAProxy as a proxy for high availability and traffic distribution.Time Synchronization: Ability to set up and maintain time synchronization systems using Chrony, systemd, ntpd to ensure timestamp accuracy and consistency.Virtualization: Knowledge of installing and managing Hyper-V virtualization to deploy and manage virtual machines.LDAP (Active Directory) automation: Skills for automating management processes and data synchronization in LDAP (ActiveDirectory) using appropriate tools and scripts.Containerization: Experience with Docker to build, deploy and manage containerized applications.Monitoring: Practical skills in setting up system and application monitoring using Zabbix, Grafana, Uptimekuma. Grafana LDAPAuthentication on Active DirectoryAutomation: Knowledge of scripting languages Bash, Ansible, PowerShell to simplify and optimize routine tasks.Data storage: Experience with installing and configuring Nextcloud for cloud storage and data collaboration

Configuration and maintenance servers, storage, & virtualization/cloud infrastructureConfiguration, deployment and maintenance of infrastructure servicesConfiguration and maintenance backup systemsUsers and Systems Technical Support, incident managementNew technologies learning and their implementation

Configuration and maintenance servers, storage, & virtualization/cloud infrastructureConfiguration, deployment and maintenance of infrastructure servicesConfiguration and maintenance backup systemsUsers and Systems Technical Support, incident managementNew technologies learning and their implementation

Dnepr

Work with other team members on objectives.Hands on knowledge of ESX/VMware environment.Plan and administer storage and backup solutions with Veeam.Installation and configuration of Linux (RedHat-based) on various hardware.Working within a Windows Server.Ensuring compliance with applicable Security Technical Implementation Guides.Assist in troubleshooting applications deployed on the infrastructure.·Work in an environment including on-premises deployments of infrastructure components.Ability to work independently with minimal supervision.Responsible for day to day operations and administration of the IT infrastructure.

Dnepr

Server Administration. Linux OS administration. Administration of Web servers.Hypervisor VM administration. Monitor existing infrastructure.Monitoring vital parts of the system.Deploy, configure systems, and maintain corporate systems and network.User support.Manage servers, network and business applications.Administering local networks and Internet channels.Maintains the security, virtual private networks (VPN) technologies within the network.Develop and implement measures to improve network security, monitor and resolve incidents.Work with other team members on objectives.

Dnepr

Responding to the problems identified by the monitoring system of sqlservers (Sybase, DB2 ,Sybase IQ, PostgreSQL, MySQL, MS SQL Server,Oracle Database) with Nagios:Identify critical failure, causes, and methods for fixingInteraction with departments operating databases, complexesWorking together to address incidentsThe message of the next deps. information security about incidents andthe timing of their elimination.Performing ongoing scheduled work on database servers on behalf ofdepartment administrators, complex owners (alter, reorg, statistics,reboot, etc.)Support and monitoring of the performance of the Replication System.(SAP Replication Server, Oracle GoldenGate)Work in OS Linux to administer databases

Dnepr

Hands on knowledge of SCVMM/Hyper-V environment.Plan and administer storage and backup solutions with Veeam.Working within a Windows Server. Work with other team members on objectives.Deploy, configure, and maintain corporate systems.Manage servers and business applications.

Network Technologies And System Administration

Bachelor, Financial And Credit

Junior Specialist, Financial And Credit

General Secondary Education, Software Engineering

Secondary Education