Available for hire

Serge Kulnev

System Administrator / DevOps Engineer

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Summary

Senior System Administrator & DevOps Engineer with 10+ years of experience managing high-load hybrid infrastructures (AWS, Azure, On-Prem). I specialize in bridging Linux and Windows ecosystems, ensuring their seamless interoperability and security. My expertise includes automating complex workflows using Terraform and Ansible, which significantly reduced manual operational overhead and accelerated deployment cycles.

I advocate for proactive monitoring, leveraging tools like Zabbix, Grafana, and Prometheus to prevent failures before they impact business-cutting unplanned downtime in recent projects. Beyond maintenance, I architect scalable solutions and lead major migrations (e.g., Oracle to PostgreSQL or nationwide retail rollouts), saving companies over $100k annually while boosting system performance.

In my free time, I enjoy building my own projects, which you can explore below.

App Store & Hobby Development

In my free time, I build software across different domains. Recently launched my first native iOS applications.

10 Words Icon

10 Words: English Daily

Minimalist vocabulary builder for English learners.

1300+ Downloads
App Store
Flick Checkers Icon

Flick Checkers

Classic checkers reimagined with smooth physics.

App Store
Translucid Icon

Translucid: Speak & Translate

Real-time translation and subtitles

App Store

Web Developments & SaaS

Full-stack web applications and platforms.

CargoDzen — All-in-One Operations Workspace

production
View Case Study ↗

Comprehensive logistics platform (TMS) automating operations with Artificial Intelligence. Features AI OCR for documents, real-time tracking, safety compliance, and role-based access control.

Python/Flask PostgreSQL Google Gemini AI DigitalOcean

HackTheStore — ASO & App Store Optimization Platform

production
View Project ↗

Project is currently in active development. AI-powered ASO tools to track App Store rankings, analyze competitors, and optimize app metadata. Looking for testers with products for App Store.

SaaS ASO AI
Trucker Route Icon

Trucker Route — Safe Navigation for US Highways

production
View Project ↗

Free road map built specifically for safer navigation across US highways. Tracks real-time accidents, road closures, and traffic jams from official DOT sources. Highlights hazardous weather conditions-ice, snow, high-wind areas-along with commercial vehicle restrictions. Essential information for safe route planning, avoiding fines, and preventing downtime.

Real-Time Data DOT Integration Weather Alerts Traffic Map

Projects

Core Competencies

Containerization & Orchestration

Docker, Docker Swarm, Amazon ECS

Cloud & Virtualization

AWS (EC2, S3, RDS, VPC, Route53, CloudFront, MongoDB, Lambda, API Gateway), Azure (AD, VMs, Storage, Virtual Desktop), Cloud.ru, Yandex.Cloud, VMware ESXi / vCenter, Hyper‑V

IaC & Configuration

Terraform, Ansible

Monitoring & Observability

Zabbix, Grafana, Prometheus, PRTG, AWS CloudWatch

CI/CD & VCS

Jenkins, GitLab CI, Git, PowerShell, Bash, Python, Ansible Playbooks

OS & Server Tools

Linux (CentOS, Debian, Ubuntu, RHEL, FreeBSD), Windows Server (2008–2019), Active Directory (GPO, DNS, DHCP, DFS, PS, FS, WSUS)

Networking & Security

Cisco, MikroTik (RouterOS/SwOS), VPNs, Routing & Switching, pfSense, FortiGate, IP/Subnetting, Firewalls

Databases & Messaging

PostgreSQL, MySQL, MS SQL Server, MongoDB, Oracle 12c/19c, ClickHouse, RabbitMQ, Kafka

Email & Telephony

Microsoft Exchange, Asterisk IP Telephony

Enterprise IT Tools

Squid Proxy, Nexus Repository, Rocket.Chat, Imaging & Deployment Tools, Asset Management Platforms

Experience

System Administrator
TIRUS INC.
Apr 2024 – Present
  • Manage Windows Server, AD (GPO, DNS), and Ubuntu fleet for 60+ endpoints.
  • Implement Zabbix & Grafana monitoring, reducing unplanned downtime by 40%.
  • Migrate internal systems to hybrid AWS (EC2/S3) for scalable backups.
  • Train dispatchers on IT tools, cutting helpdesk tickets by 30%.
DevOps Engineer
SBERBANK
2021 – 2023
  • Administered 80+ RHEL/Ubuntu servers; reduced recovery time by 60%.
  • Automated 95% of CI/CD pipelines using Ansible & Jenkins.
  • Migrated Oracle/WebSphere to PostgreSQL/WildFly, saving $100K/year.
  • Hardened production environments and streamlined test delivery.
System Administrator
FODD
2020 – 2021
  • Upgraded Active Directory (2008→2016) and deployed Azure AD.
  • Enabled 100% remote work during pandemic via Azure Virtual Desktop.
  • Launched new data center infrastructure from planning to deployment.
  • Reduced critical incidents by 25% via centralized monitoring.
System Administrator
TRANS MANAGEMENT
2015 – 2020
  • Scaled IT infrastructure for rapid growth (mixed Windows/Linux).
  • Established site-to-site MikroTik VPNs & Asterisk Telephony (saving $10K/yr).
  • Deployed HP/Dell servers with CentOS/Debian and 1C/PostgreSQL.
  • Managed procurement and license compliance for 130+ endpoints.

Certifications

  • Red Hat OpenShift I: Containers
  • Jenkins: Automating Delivery Pipelines
  • Terraform Basics: Automate Provisioning
  • Ansible Basics
  • Linux for Developers

Education

Bachelor of Computer Science and Information Security

Moscow Finance and Law University

Contact

Let's work together

Open for new opportunities in DevOps and System Administration.