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Valeriy Khashkovskiy is a systems and software engineer who has been building, operating, and researching production infrastructure since 1997. Over more than two decades he has accumulated hands-on experience spanning bare-metal Linux administration, cloud-native architectures on AWS, GCP, and Azure, site reliability engineering, and financial operations for cloud spend. Everything published on notes.vvkhash.com comes directly from that day-to-day practice — you will not find toy examples or vendor copy here, only patterns and commands that have been tested in real environments.

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Background

Valeriy holds a PhD in Software Engineering from TSURE/SFEDU and has served as an Associate Professor at Southern Federal University since 2005, contributing 108 indexed scientific papers (RSI). He currently works at EPAM Systems (2019–present) as a Systems, DevOps, and FinOps engineer, alongside contract SRE and DevOps roles across multiple organisations.
These notes are a living reference maintained alongside active production work. Pages are updated when something changes in practice, not on a publishing schedule.

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Areas of Expertise

Valeriy’s primary focus areas map directly to the sections you will find throughout this site:

DevOps & CI/CD

Pipeline design and day-two operations across GitLab CI, Jenkins, Tekton, Bamboo, and GoCD — with a particular emphasis on reproducible, container-based builds.

Cloud & Infrastructure

Deep AWS experience (primary cloud), plus GCP and Azure. Infrastructure-as-Code with Terraform and Ansible, and FinOps cost-optimisation across all three providers.

Site Reliability Engineering

Observability stacks (Prometheus/Grafana, ELK, Zabbix), incident response, capacity planning, and SLO/SLA design in high-availability environments.

Linux & Systems

25+ years of Linux administration, Bash scripting, networking, and systems-level troubleshooting on everything from VMs to Kubernetes nodes.

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Container & Orchestration Platforms

Valeriy works daily with Docker, Kubernetes, Nomad, and Proxmox — covering the full spectrum from local development containers to multi-cluster production deployments.

Docker

Build optimisation, multi-stage images, registries, and Compose patterns.

Kubernetes

Workload management, networking, RBAC, and cluster operations.

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Data & Observability

Production experience with MySQL, PostgreSQL, Greenplum, and Oracle databases, combined with observability pipelines built on Prometheus, Grafana, ELK, and Zabbix.

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Certifications

The following credentials reflect formal validation of the topics covered in these notes:

AWS Certified Solutions Architect – Associate

Core AWS architecture, compute, storage, networking, and security best practices.

FinOps Certified Practitioner

Cloud financial management, unit economics, and cost-optimisation frameworks.

Microsoft Certified: Azure Fundamentals

Foundational Azure services, governance, and cloud concepts.

AWS Well-Architected Proficient

Applying the AWS Well-Architected Framework across the five pillars in real workloads.
Additional accreditations include AWS Cloud Quest Cloud Practitioner, AWS Partner: Technical Accredited, MACH Mindset, and Modern Technology with MACH.
If a topic you care about is not yet covered, the introduction page lists what is currently available. The site grows as new patterns are worth documenting.

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Why These Notes Exist

Engineering knowledge decays fastest when it lives only in someone’s head or in a closed wiki. Publishing these notes publicly forces rigour — every page has to be accurate enough to be useful to someone other than the original author. You get a searchable, versioned reference; Valeriy gets a forcing function to keep his own documentation honest. Browse by topic in the sidebar, start with the introduction, or jump straight into a section that matches what you are working on today.
Last modified on June 10, 2026