• Software engineering
• Database Systems
• Computer Networks and Network Programming in Java
• Data integration and data warehouses
• Programming for data science/analysis
• Database management

Freelance SRE and DevOps role focused on build system maintenance, software packaging for Linux distributions, and CI/CD workflow management using GitHub Actions.

• Maintenance of build systems that utilize Autotools, Make, CMake.
• Packaging software for Debian and Redhat based Linux distributions (DEB, RPM).
• Maintenance of CI/CD workflows using GitHub Actions.
• Facilitation of migration from Bamboo to GitHub Actions.

Senior Software Developer role focused on Kubernetes operator development, BareMetal server provisioning, and performance optimization in large-scale cluster environments. Contributed to open source projects and developed custom solutions for Kubernetes and OpenStack integration.

• Developed and managed Kubernetes operators and ClusterAPI providers for BareMetal server provisioning and life-cycle management.
• Developed iPXE edge controller bridging Kubernetes and OpenStack Ironic integration.
• Created a DHCPv4 Relay in pure Golang for dynamic Kubernetes cluster environments.
• Improved BareMetal servers provisioning performance in large Kubernetes clusters by up to 10x.
• Collaborated with system engineers and developers on complex system requirements.
• Contributed to open source projects including Metal3.io and OpenStack.

Led development of various infrastructure and container management solutions using Golang, with a focus on security, monitoring, and performance optimization.

• Led team, coordinated projects, and mentored junior staff.
• Developed back-end infrastructure-related services using Golang.
• Created fanotify-based file modification monitoring for Linux containers.
• Implemented custom L7 and L2/L3 DDoS protection using Nginx.
• Developed distributed TLS certificate storage using Golang FUSE filesystem.
• Created WebUI for container backup solution using Gin, Semantic UI, and PostgreSQL.
• Implemented network hooks for LXC/LXD and Libvirt for advanced networking setups.
• Developed API, WebUI, and CLI for website screenshots using CDP and headless Chromium.
• Created custom Cgroups monitoring agent for Linux containers with Clickhouse and Grafana.

Responsible for server and container provisioning and maintenance, leveraging SaltStack and in-house solutions to manage infrastructure efficiently.

• Managed BareMetal server and Linux Containers provisioning (in-house solution | SaltStack) and maintenance.
• SaltStack leveraging Salt-SSH for container maintenance.
• Maintained Salt in Master-Minion mode for BareMetal servers.
• Worked with various datacenter (hardware) and web-hosting (software) related technologies.

Responsible for infrastructure administration, server monitoring, and providing tailored hosting solutions and technical support to customers.

• Administered and provisioned network infrastructure and equipment.
• Monitored BareMetal servers, services, and data transport channels using Zabbix and Nagios.
• Provided customer consultation and extensive technical support.
• Tailored Linux Containers based hosting solutions to meet various customer requirements.
• Managed software including Nginx, Apache, PHP, MariaDB/MySQL, Redis, Memcached, Sphinx, Elasticsearch, and Varnish.

The Mirantis DHCPv4 Relay is a lightweight, containerized DHCPv4 relay agent designed for use in container environments.

• Implements DHCPv4 relay functionality for containerized environments
• Open-source project

nginx-js-challenge is a security addon for NGINX that implements a JavaScript-based challenge-response mechanism.

• Implements JavaScript-based challenge-response mechanism for NGINX
• Provides protection against DDoS attacks and bot traffic
• Uses browser's JavaScript execution capabilities for verification
• Integrates with NGINX using the njs module
• Open-source project with MIT license

go-fanotify is a Go library that provides bindings for the Linux fanotify API.

• Provides Go bindings for the Linux fanotify API
• Enables file system monitoring and notification in Go programs
• Supports various fanotify events and flags
• Includes examples for basic usage and advanced features
• Allows for efficient file system auditing and access control
• Open-source project with MIT license