- Designed a roadmap to increase stability, visibility, observability, security, and development velocity by following the best practices and implementing various architectural solutions. - Configured parsers of underlying Kubernetes CNI background processes. - Configured infrastructure to achieve FedRAMP compliance. - Written Prometheus Exporter to fetch data from GitHub Actions and underlying jobs and steps to create statistics dashboard in Grafana.

- Designed tens of infrastructure solutions from scratch within AWS. - Created the whole infrastructure from scratch. - Designed and created a convenient multi-tenancy platform for developers and DevOps Engineers. As a result, the manual actions have been eliminated by 80%. - Reduced costs and latency between components by implementing various architectural solutions. - Changed repositories structure and implement a convenient unique flow for developers and a product in terms of git. - Taught developers to prepare microservices using the advantages of Kubernetes and different Cloud Providers such as AWS or GCP. - Implemented CI/CD process based on Jenkins and shared library written in Groovy that allows describing a pipeline and different stages in YAML format. - Implemented GitOps approach based on ArgoCD solution. - Created a convenient custom solution that allows describing the new ArgoCD Application abstraction in a few YAML strings. - Migrated logging stack from EFK (Elasticsearch, Fluentd, Kibana) to PLG (Promtail, Loki, Grafana). - Optimized Promtail filters and expressions to use unique labels and improved Loki performance. - Migrate from Prometheus to VictoriaMetrics to reduce resources consumption, and cost to create a centralized high-availability solution. - Created and prioritized alerting based on monitoring and logging stack. - Created a flexible single Helm Chart for all microservices. - Automated different processes using Ansible as a configuration management tool. - Implemented decoupled architecture for applications and described it in Terraform. - Written flexible backup tools for PostgreSQL and MongoDB in Python. Written a web interface in Python to visualize business metrics from Prometheus. - Written in Golang a tool to sync Kubernetes secrets with HashiCorp Vault and a tool to clean up Kubernetes Jobs based on custom logic (a little bit more flexible than TTL-after-finished Controller in Kubernetes).

- Created the whole infrastructure from scratch. - Implemented the versioning approach for a product and microservices. - Linux troubleshooting. - "Dockerized" applications and deploy different self-hosted solutions such as Atlassian production, GitLab, etc. - Created a wrapper for git-flow utility written in Bash to automate new microservices creation. Created other automation scripts that are written in Bash. - Prepared Docker Compose to simplify the development process on the local environment with profiles and extension fields features. Implemented DRY (Don't Repeat Yourself) principle with anchors and aliases. - Created different environments based on AWS EC2 instances. - Implemented CI/CD process based on Jenkins and declarative pipelines. - Automated different processes using Ansible as a configuration management tool. - Implemented Quality Gate feature based on SonarQube. - Described AWS infrastructure via Terraform with custom Terraform modules. - Implemented a monitoring stack and alerting based on Prometheus, Alertmanager, and Grafana solutions. - Created a self-managed Kubernetes cluster in HA mode using kOps utility. - Migrated infrastructure from AWS EC2 instances to the Kubernetes cluster. - Written a tool in Python to sync GitLab boards and Trello boards in both ways. - Administration, troubleshooting, and management of self-hosted relational and non-relational databases.