Ivan Shelestov

- Developed and maintained observability and monitoring system for critical insights; - Transformed the monitoring system into the scalable and distributed solution using Grafana Mimir; - Conducted load testing for the company's services, analyzed and interpreted the results, proposed improvements based on that output; - Built Prometheus exporters for collecting business metrics; - Managed and optimized large Elasticsearch clusters and the full Elastic toolchain, including Logstash and Kibana.

- Deploying, maintaining, monitoring and improving the reliability, scalability and performance of the in-house built crypto platform and infrastructure; - Ensuring systems remain secure and all operational requirements are fulfilled; - Developing Go-coded services to ensure that systems run smooth, clean, and robust. Personal Result: - From scratch: established monitoring service for company`s products, including crypto platform itself.

Personal Result: - Built service to automate Incident-Management processes. That boosted incident resolution time by 40%; - Made refactoring of the service written in Ruby and rewritten in Golang; - Built One-Click Test-Environment service: an app that created test environments for developers and QA engineers. - Infrastructure development supported existing internal services in the SRE/Platform team and added new features and performance metrics.

Personal Result: - Built a service saves the company 100 000 EUR per year; - Monitoring-platform project: created user friendly monitoring tools for our internal customers; - Cash security service: developed service that collects logs to find discrepancies in cash registers and, thus, reduces company's money loss; - Transferred knowledge to Junior colleagues.

Personal Result: - Refactored legacy code; - Rewrote existing tools from PHP, Ruby to Python; - Created a service that scans a company's network for detecting invalid open ports; - Developed new tools for detecting slow queries in DB; - Built a security service with necessary alerting.

- Technical support for corporate customers: resolved issues with on-premises servers; - Administration (CentOS, Red Hat, OEL); - Developed server infrastructures for clients` projects and in-house projects; - Configured Nginx/Apache, conducted load balancing. Personal Result: - Reduced solution time standard tickets by 30% contributing to the technical documentation and optimizing the processing of it; - Built and improved services automation with Bash and Python: got rid of repetitive operations.

- MS Active Directory Administration; - Configured the local network; - Supported infrastructure services and monitoring systems; - Performed administration and regular maintenance of Windows 2008/2016 servers and applications; - Scheduled system updates (testing, organization, backup); - Administered FreePBX, Linux. Personal Result: - Uniterrupted monitoring of infrastructure and systems was ensured; - Necessary configuration settings were timely performed.