Oleksii Bohuslavets

A growing IT company with 30+ remote employees across 4 countries needed secure access to internal resources — Git repositories, staging servers, databases, and internal wikis. Staff used personal VPNs and shared passwords. Two incidents had already occurred: an ex-contractor accessed production data a month after leaving, and a developer's credentials were found in a public paste.

Result: Deployed WireGuard VPN with per-user X.509 certificates and automatic key rotation every 90 days. Built a self-service portal where HR triggers access provisioning on hire and instant revocation on departure. Split tunneling ensures only corporate traffic goes through VPN. Setup for new hires takes 5 minutes. Zero security incidents in 18 months since deployment. The company passed their SOC 2 audit on the first attempt.

An e-commerce platform processing 2,000+ orders daily was losing revenue from undetected outages. The team only learned about problems when customers complained on social media — sometimes 3-4 hours after the issue started. During Black Friday, a 45-minute database slowdown cost the business an estimated $15,000 in lost sales because nobody noticed until checkout started timing out.

Result: Built a comprehensive monitoring stack: Prometheus for metrics, Loki for centralized logs, Grafana for 12 custom dashboards covering every layer from infrastructure to business KPIs. Configured multi-channel alerts through Telegram, email, and Slack with smart escalation — warnings go to the channel, critical alerts page the on-call engineer directly. Added synthetic monitoring that simulates a full checkout every 60 seconds. Mean time to detection dropped from hours to under 90 seconds. The next Black Friday had zero undetected incidents.

A development team of 8 engineers spent 3-4 hours on each deployment, manually copying files via SCP, running database migrations by hand, and restarting services one by one. Deployments happened only on Fridays (to have the weekend to fix things), and roughly 1 in 3 failed due to forgotten steps, environment mismatches, or configuration drift between servers. Rollbacks took another 2 hours.

Result: Automated the entire pipeline: push to Git triggers linting and tests, builds Docker images with unique tags, pushes to a private registry, and deploys to staging automatically. Production deployments require a single merge to main with automatic rollback on health check failure. Added Terraform for infrastructure provisioning — spinning up a new environment takes one command. Deployments now take 90 seconds with zero manual intervention. The team deploys 3-4 times daily instead of once a week, and rollbacks are instant.

A logistics organization with 200+ users managed accounts across 12 separate systems — ERP, CRM, email, file shares, ticketing, VPN, and more. Each system had its own credentials. Onboarding a new employee took 2 full days of IT work. Former employees sometimes retained access for weeks because deprovisioning required manual steps in every system. Password reset requests consumed 30% of the helpdesk team's time.

Result: Centralized identity with Active Directory and LDAP federation across all 12 systems. Deployed single sign-on (SSO) via SAML/OAuth so employees use one set of credentials everywhere. Built Group Policy Objects for automated workstation configuration — new laptops are production-ready in 20 minutes. Self-service password reset cut helpdesk tickets by 40%. Onboarding now takes 15 minutes (one form triggers provisioning everywhere), and offboarding is instant — disable one account, lose access to everything. Annual security audit time reduced from 2 weeks to 2 days.

Infrastructure documentation was perpetually outdated — written once during setup and never maintained. Scripts were written from scratch every time because previous scripts were undocumented and stored on individual engineers' laptops. Troubleshooting relied entirely on tribal knowledge locked in two senior engineers' heads. When one went on vacation, incident response times tripled. The team estimated they wasted 15-20 hours per week on repetitive tasks that could be automated.

Result: Integrated AI tools into the daily engineering workflow at every stage. Claude Code generates and maintains infrastructure documentation that stays in sync with actual configs. GitHub Copilot assists with Ansible playbooks, Docker configurations, and monitoring rules — cutting script writing time by 60%. Built an AI-assisted troubleshooting runbook that junior engineers use to resolve 80% of common incidents without escalation. This entire platform you're viewing — the Rails application, blog system, admin panel, CI/CD pipeline, and all content — was built with AI pair programming in under 3 weeks, a project that would traditionally take 2-3 months.

A SaaS startup was running their entire application on a single unmanaged €300/month VPS with no backups, no monitoring, no staging environment, and a self-signed SSL certificate that browsers flagged as insecure. The database and application shared the same server. Any server failure meant hours of downtime — the founder had to SSH in from his phone to restart services. They lost their database once and recovered only because a developer had a 3-week-old dump on his laptop.

Result: Designed and executed a zero-downtime migration to AWS with proper architecture: Application Load Balancer, auto-scaling group (scales from 1 to 4 instances based on CPU), managed RDS with automated daily backups and point-in-time recovery, S3 for static assets with CloudFront CDN (50ms global latency), VPC with private subnets for database isolation, and proper SSL via Let's Encrypt with auto-renewal. Added health checks, automated snapshots, and disaster recovery documentation. Monthly costs dropped from €300 to €55 while uptime went from ~95% to 99.95%. The startup has since grown 5x without any infrastructure changes.