Resume

Email: denys@miasnychenko.com | Location: Chicago area, IL
LinkedIn: linkedin.com/in/denys-miasnychenko-25988637 | GitHub: github.com/jtsunne
Work Authorization: Authorized to work in the US, no sponsorship required

Profile

IT professional with 25+ years of experience in DevOps, SRE, and infrastructure architecture. Deep Elasticsearch/ELK expertise (large-scale logging platforms, migrations, tooling), with recent focus on service mesh (Istio), observability platforms, and AI/LLM agent infrastructure (MCP, Claude Code). Measurable results: 20-50% cost reductions, 6x performance improvements, and successful multi-cloud migrations.

Work Experience

Senior Software Architect / Senior DevOps Engineer at OpticsPlanet, Ltd

October 2019 - Present

Led DevOps transformation and infrastructure optimization across multiple teams. Architected enterprise-scale observability, logging, service mesh, cost optimization, and AI platform solutions in multi-cloud and hybrid on-prem environments (AWS, Azure, RKE2).

• Designed and built company-wide AI usage monitoring (OpenTelemetry, Prometheus, Elasticsearch, Grafana): from metric collection to cost dashboards attributed per Jira ticket
• Built and deployed a production MCP server (Go) giving LLM agents access to logs and metrics from 12 backends, adopted by the entire Software Development Department; built-in query functions cut agent context usage from 108K to 38K tokens (about 65%)
• Initiated company-wide Claude Code adoption and designed a layered configuration platform (company, team, personal) serving 24 development teams
• Benchmarked and audited LLM models and AI spend, and presented the findings in internal talks
• Architected the company’s first Istio multi-primary service mesh across AWS EKS and on-prem RKE2 (shared-CA mTLS, Entra ID auth, OTel tracing); adopted as the 2026 platform direction
• Led the logging platform modernization from ELK 6 to ELK 8 on Kubernetes (Kafka, Logstash 8): 5.8TB of indexed logs, shards reduced from 2718 to 269, 60+ applications migrated, zero audit-data loss
• Re-architected HAProxy log ingestion from grok to native JSON, cutting Logstash CPU roughly 300x (30 to 0.1 cores) and replicas from 15 to 2
• Architected VictoriaMetrics consolidation of Prometheus and InfluxDB across 9 clusters (3.67M active series, 107K samples/s)
• Reduced monthly EKS spend by $10K ($50K to $40K) with cluster autoscaling and right-sizing; moved workloads to Graviton (ARM64) spot node groups with multi-arch builds, eliminating recurring spot-capacity outages
• Cut Splunk costs by 50% (ingest-based pricing) through log filtering and retention optimization, then retired Splunk entirely in favor of the in-house ELK platform
• Improved mobile testing pipeline performance by 6x (from 60 to 10 minutes)
• Led Kubernetes migration improving application scalability and reducing deployment time by 70%
• Implemented cross-application request tracing (X-Trace) reducing debugging time by 80%
• Developed rate limiting and request throttling (HAProxy stick tables) handling 100K+ req/sec
• Created and maintain a rolling 3-year DevOps roadmap, extended every year so the current and next two years are always planned; adopted company-wide
• Built Elasticsearch monitoring tools: a Chrome/Firefox plugin increasing DevOps team productivity by 40%, and epm, an open-source Go terminal dashboard for live cluster performance (github.com/jtsunne/epm-go)
• Participate in the on-call rotation; built log-pipeline alerting (Kafka consumer lag, Logstash replicas, Elasticsearch health) and maintain an operations runbook and incident knowledge base of 100+ articles
• Mentored developers and architects, led the Kubernetes and CI/CD guild, and published technical articles in corporate Confluence and internal presentations

Stack: Go, Python, Bash, Node.js | Kubernetes (EKS, RKE2), Helm, Istio/Envoy, Docker | AWS (EKS, Graviton, Lambda, EC2, S3), Azure | Terraform, Terragrunt, Atlantis, Puppet, Vault | Elasticsearch, Logstash, Kibana, Kafka, RabbitMQ, MySQL, PostgreSQL | Prometheus, VictoriaMetrics, Grafana, OpenTelemetry, Elastic APM, Nagios | HAProxy, Varnish, Akamai | Bamboo, Jenkins, Bitbucket | MCP, Claude Code, LLM tooling | Linux, macOS

DevOps Engineer at OpticsPlanet, Ltd (Ukraine office)

April 2017 - October 2019

Established DevOps practices and automation pipelines for CI/CD. Built foundational infrastructure for development and monitoring systems.

• Architected and deployed company-wide development environment supporting 50+ developers
• Implemented comprehensive monitoring and alerting system (Prometheus, Grafana) with 99.9% uptime
• Established automated CI/CD pipelines reducing deployment time by 60%

Software Engineer / DevOps Engineer (Payment processing company)

February 2012 - March 2017

Developed and maintained enterprise applications and infrastructure. Specialized in high-load systems and PCI DSS compliance for financial services.

• Led PCI DSS compliance implementation for 2 financial companies achieving certification
• Optimized high-load systems handling 1M+ daily transactions
• Architected payment processing integration reducing transaction latency by 50%

Stack: Java, PHP, Python, Node.js | MySQL | Spring, Hibernate | Linux

Chief of Development and IT Departments at SKTplus Broadcasting Company

March 2009 - February 2012

Led enterprise IT strategy and infrastructure modernization. Managed development and IT teams (15 people) overseeing network transformation.

• Led fiber optic network migration covering 50km replacing copper infrastructure
• Implemented DVB-C digital broadcasting platform serving 10K+ subscribers
• Consolidated 3 head stations into unified base station reducing operational costs by 35%
• Launched DOCSIS-based Internet services generating $200K additional annual revenue
• Developed billing system integration with payment gateways processing $1M+ annually

Chief of IT Department at a Ferroalloy Plant (Eastern Ukraine)

January 2005 - February 2009

Managed IT department (10 people) including system administrators and developers. Developed and executed enterprise IT strategy and infrastructure upgrades.

Earlier Positions

• Software Engineer at a Ferroalloy Plant (2003-2005): Development and server administration
• Software Engineer at The Trophy Ltd (2001-2003): Linux kernel module development for billing systems
• Software Engineer at a City Council (Eastern Ukraine) (1997-1999): Software development (Delphi, Clipper)

Education

Master’s Degree in Professional Pedagogics
Ukrainian Engineering Pedagogics Academy, 1997-2003