Виктор

Viktor Bilytskyi

email : [open contact info](look above in the "contact info" section)
phone: [open contact info](look above in the "contact info" section)
telegram: @victorcifra

ABOUT ME
Senior Devops engineer, Site reliability engineer

Senior DevOps / Site Reliability Engineer with 15+ years of experience in Linux-based
infrastructures. Skilled in designing, automating, and maintaining high-availability
environments with modern web stacks, clustering technologies, and CI/CD practices.
Focused on improving reliability, scalability, and developer efficiency in mission-critical
systems. With focus on security and AI-driven automation.
Autodidact engineer passionate about building robust systems and adopting cutting-edge
tools—often before they become industry standards.

EDUCATION

2003-2007
Dnipro National University (Radiophysics & Microelectronics Department)
Bachelor of Engineering: System Engineering Programmer

EXPERTISE/SKILLS

• OS administration: Debian-based, Ubuntu, CentOS, Arch Linux, Gentoo, FreeBSD
• Virtualization: ESXi, Hyper-V, kvm/qemu, Proxmox
• FIREWALL/WAF: iptables, ufw, ModSecurity, Cloudflare
• Containerization/Orchestration: docker, docker-compose, kubernetes
• CI/CD, Automation: Ansible, Terraform, GitlabCI, Chef, Puppet
• Monitoring: Zabbix, Prometheus, Grafana
• VPN: OpenVPN, Wireguard, IPsec
• Databases: MySQL/MariaDB, PostgreSQL, MongoDB, ClickHouse, Redis,
ElasticSearch, OpenSearch
• Scripting: Bash, Perl, Python
• Programming languages: Python, PHP, C/C++, Assembler, SQL
• IP telephony: Asterisk, FreePBX
• Router Administration: Cisco, Mikrotik
• AWS: IAM, EC2, S3, EBS, EFS, EKS, ELB, VPC, RDS, Route 53
• AI: VOSK, ASR, QWEN*, LLAMA*, DEEPSEEK*, N8N, Transformers
• TALK SETUP: Matrix Synapse, Coturn, RocketChat, Slack, Jitsi
• WEB STACK: Apache, Nginx, Haproxy, PHP-FPM
• MESSAGE PIPELINES: RabbitMQ, LogStash
• SECURITY AUDIT: Aduditd, Veloceroptor, Tripwire, Nmap

EXPERIENCE

Senior DevOps Engineer (Remote) 2023-2025
Confidential Company (Finance Industry)

• Operate and support large-scale infrastructure of 1000+ servers across bare metal and
cloud.

• Designed and deployed a high-load federated communication infrastructure (Matrix Synapse
+ Coturn/VoIP) spanning 10 servers, serving 5000+ concurrent users with guaranteed
availability and security.

• Orchestrated migration of high-traffic production services to Docker/Docker-Compose,
implementing Ansible-based automation for deployment, scaling, and management.

• Led cloud migration initiatives to AWS using Terraform/awscli, establishing secure cross-
cloud connectivity (AWS ↔ Alicloud) via IPSec tunnels with BGP routing, and unifying multi-
region AWS networks — reducing inter-server latency by 50% on critical paths (EU-HK, EU-JP,
JP-HK) and driving significant improvements in production system KPIs.

• Migrated monolithic services to Docker containers, closely collaborating with development
teams to ensure seamless transition.

• Managed and escalated L3 Support operations, resolving critical production incidents under
SLA constraints.

• Developed and fine-tuned neural network services (ASR/VOSK-based) using LoRA/QLoRA
for real-time transcription and sentiment analysis of support call center communications.
Maintained end-to-end ML pipeline lifecycle, including model retraining, deployment, and
seamless service updates. Cut audio recordings storage costs by 80% through ASR-powered
transcription (VOSK), replacing raw audio with text while preserving full context for NLP
analysis and compliance.
DevOps Engineer 2020-2022
The Kernel FZ LLC, Dubai (Remote)

• Supported 200+ Linux servers in production, providing secure and reliable operations for
client-facing services.

• Designed and deployed end-to-end server infrastructures and application stacks for clients
under turnkey contracts, including post-deployment support and SLA-based maintenance.
• Implemented and tuned Web Application Firewalls (WAF) with ModSecurity, leveraging
OWASP Core Rule Set and custom rules to mitigate SQLi, XSS, and DDoS attacks.
• Configured Cloudflare for CDN, DNS management, and enhanced security policies (DDoS
protection, Bot Management, WAF integration), improving global latency and attack
resilience.
• Led large-scale migrations and horizontal scaling of high-traffic environments (load-
balanced clusters, distributed databases), achieving zero-downtime deployments for critical
services.
• Automated firewall policy management and network security enforcement via Ansible,
ensuring consistent rulesets across hybrid cloud and on-prem environments.
• Deployed and customized CRM/e-commerce platforms (WordPress/WooCommerce,
Magento, OpenCart), including performance optimization, payment gateway integration, and
security hardening.

DevOps Engineer Team Lead / Partner 2017-2022
Kodeks LLC, Dnipro, Ukraine

• Led a DevOps team (8 engineers) in managing and securing high-availability hotel booking
infrastructure and payment gateways across Europe. Architected network segmentation
(DMZ/CDA zones) with granular monitoring and audit trails to meet PCI DSS compliance
requirements. Conducted penetration testing, security audits, and post-breach forensic
analysis. Customized PHP-based applications for payment processing while maintaining strict
security protocols.

• Designed and optimized high-load web environments using HAProxy, Nginx, Apache, and
MySQL/MariaDB with clustering, replication, and load balancing to ensure scalability and fault
tolerance.
• Built and managed private cloud infrastructures for high-traffic systems, implementing
infrastructure-as-code (IaC) tools including Ansible, Chef, and Puppet for automated
provisioning, configuration, and orchestration.
System Administrator / System Engineer / Partner 2011-2017
Cifra LLC, Dnipro, Ukraine

• Maintained 50+ Linux/FreeBSD servers and 20+ network devices, ensuring stable services
for 200+ internal users.

• Deployed centralized monitoring (Zabbix), improving incident visibility and reducing
downtime.

• Automated regular maintenance with Bash/Perl/Python scripts.

• Engineered custom Gentoo/FreeBSD-based systems for telephony control hardware,
optimizing kernel configurations and low-level driver modules for Asterisk PBX integration.
Developed bespoke solutions for signal processing, hardware abstraction, and real-time
performance tuning in resource-constrained environments.

LANGUAGE

Russian: Fluent
Ukrainian: Native
English: Intermediate