SLO 99.99% · all systems nominal

Cloud systems
built to stay up.

Core IT Solutions designs and operates high-performance backend platforms and cloud architectures for companies that can't afford to be down — in fintech, iGaming, and SaaS.

99.99%
uptime SLO
50k
req/s per service
B+
events/day processed
Our values

Three principles
we don't negotiate.

Every decision — every line of infrastructure code, every incident response, every architectural trade-off — runs through these three filters.

/ 01
Innovation

We push the boundaries of cloud technology to deliver cutting-edge solutions that anticipate tomorrow's problems.

/ 02
Reliability

Enterprise-grade systems engineered for uptime. Our SLOs aren't aspirational — they're the floor.

/ 03
Scalability

Architectures that compound. What handles a thousand users today handles a million tomorrow without a rewrite.

What we do

Eight services.
One outcome: systems that ship.

Comprehensive cloud and backend engineering. Pick the pieces you need, or let us own the whole platform end-to-end.

Technology stack

The tools, used deliberately.

We choose technology based on the problem — not the hype cycle. Here's what's in the toolbox.

Languages
Programming Languages

Typed, production-proven languages. We pick the right one for the workload — not the trendy one.

TSTypeScript
JSJavaScript
JvJava
PyPython
Leadership

The person
behind the architecture.

The person behind the architecture decisions — and the one accountable when something matters.

Serhii F., Founder & CEO of Core IT Solutions
/ portrait · serhii f.founder
Founder & CEO

Serhii F.

An experienced software engineer with over 12 years of expertise in building reliable, scalable, and high-performance systems. Serhii specializes in designing distributed architectures and leveraging cloud-based platforms to deliver innovative solutions across diverse technical domains — fintech, iGaming, and enterprise SaaS.

Proven track record leading platforms at 99.99% uptime and cutting operational cost through principled performance work. Turns ambiguous technical problems into maintainable systems — and keeps teams focused on shipping the thing that matters.

Software ArchitectureDistributed SystemsAWS & Cloud InfrastructureTeam Leadership
12+
years experience
99.99%
platforms led
Billion
events processed
Latest insights

Notes from
the engine room.

Deep-dives on architecture, infrastructure, and the patterns that keep high-stakes systems running.

ArchitectureEvent-Driven Architecture in Fintech and iGaming: Why Milliseconds Matter — Architecture article cover
Nov 20, 2025·12 min read

Event-Driven Architecture in Fintech and iGaming: Why Milliseconds Matter

How event-driven systems are powering real-time payments, live betting, and fraud detection at scale. Real examples from production systems processing billions of events.

Event-Driven ArchitectureFintechiGamingKafka
Industry InsightsThe iGaming SaaS Revolution: How Platform Providers Are Reshaping a $333B Industry — Industry Insights article cover
Nov 17, 2025·14 min read

The iGaming SaaS Revolution: How Platform Providers Are Reshaping a $333B Industry

Inside the explosive growth of iGaming SaaS platforms, from back-office solutions to full-stack providers powering the next generation of operators.

iGamingSaaSPlatform DevelopmentInfrastructure
AI & DevelopmentHow AI is Revolutionizing Software Development Speed — AI & Development article cover
Nov 8, 2025·5 min read

How AI is Revolutionizing Software Development Speed

Discover how AI tools are delivering 30%+ efficiency gains and transforming development workflows in 2024.

AIProductivitySoftware DevelopmentInnovation
Backend DevelopmentNestJS + Fastify: The Enterprise Microservices Powerhouse — Backend Development article cover
Oct 22, 2025·7 min read

NestJS + Fastify: The Enterprise Microservices Powerhouse

Real-world benchmarks show 2.5x performance gains. Here's how we serve 50K requests/second with NestJS + Fastify.

NestJSFastifyMicroservicesPerformance
SecurityK8s Security: Essential Best Practices for Enterprise Deployments — Security article cover
Oct 5, 2025·8 min read

K8s Security: Essential Best Practices for Enterprise Deployments

Protect your Kubernetes clusters with these critical security practices and lessons from recent breaches.

KubernetesSecurityDevOpsBest Practices
Developer ToolsClaude Code vs Cursor: Choosing the Right AI Coding Assistant — Developer Tools article cover
Sep 28, 2025·6 min read

Claude Code vs Cursor: Choosing the Right AI Coding Assistant

A comprehensive comparison of Claude Code and Cursor to help developers choose the best AI tool for their workflow.

AIClaudeCursorIDE
SecurityBulletproof Your GitHub: Security Best Practices for 2024 — Security article cover
Sep 15, 2025·10 min read

Bulletproof Your GitHub: Security Best Practices for 2024

Comprehensive guide to securing your GitHub account with 2FA, SSH keys, and enterprise-grade security measures.

GitHubSecurity2FASSH
Get in touch

Tell us what you're
building.

A short note is enough. Founder reads every inbound and responds within two business days.

Address
Core IT Solutions s. r. o.
Doležalova 3424/15C
82104 Bratislava-Ružinov
Slovakia