A software engineer with a focus on modern web technologies, clean architecture, and well-designed user interfaces. Open for project-based collaboration, custom web application development, and consulting.

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Website & App Development Cost Calculator | Serhii Iver

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Introduction

Full Stack Developer

Imprint and legal information for Serhii Iver's portfolio website, including contact details and disclaimer.

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Impressum

Professional web development in Cologne, Germany. Building high-performance websites, e-commerce platforms, and custom SaaS MVPs using React & Next.js.

Web Developer & SaaS Solutions in Cologne | Serhii Iver

Five Solid Evidences Attending Design Is Good For Your Career Development.

Ten Mind-Blowing Reasons Why Design Is Using This Technique For Exposure.

I Will Tell You The Truth About Design In The Next 60 Seconds.

What You Know About Design And What You Don't Know About Design.

Forgive Yourself for Not Being Perfect. Then Do It Again Tomorrow.

Why Decorating Your Home Is Good for Your Mental Health

Read our latest articles, insights, and updates on modern web development and design.

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Serhii Iver

Mobile Application for Asset Tracking

High-Performance Billing Architecture

Big Data Analytics & Consumer Insights Dashboard

Real-Time Geospatial & Mission-Critical Control System

High-Load Enterprise Web Platform Modernization

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Featured Projects

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Interactive Calculator

A transparent guide on the costs, phases, and technologies for building a modern website in Cologne. Calculate your budget with our interactive calculator.

Having a Website Created in Cologne: What Does It Cost in 2026?

Stop fighting the compiler and write cleaner, safer TypeScript code. Master type assertions, zod validation, generic design, structural typing, and discriminated unions.

TypeScript Mistakes Every Developer Makes (And How to Fix Them)

A comprehensive developer guide to Next.js SEO architecture. Master dynamic metadata configuration, optimize Core Web Vitals, implement multilingual sitemaps with hreflang, and integrate structured JSON-LD data.

The Ultimate Next.js SEO Checklist: SSR, Dynamic Sitemaps, and Core Web Vitals

A professional database performance engineering guide. Master execution plan analysis using EXPLAIN BUFFERS, design high performance covering indexes, optimize JOIN algorithms, and tune autovacuum parameters.

PostgreSQL Query Optimization: Explains, Covering Indexes, and Autovacuum Tuning

A professional engineering guide to resolving CSS layout bugs. Discover console-based overflow detection, master flexbox sizing calculations, debug Safari stacking contexts, and fix mobile viewport issues.

Advanced CSS Debugging: Stacking Contexts, Flexbox Quirks, and Viewport Bugs

A professional developer guide to advanced Git mechanics. Learn how to reconstruct lost uncommitted files via git fsck, automate bug hunting with git bisect, master interactive rebasing, and search history using the pickaxe engine.

Git Under the Hood: Disaster Recovery, Interactive Rebasing, and Pickaxe Search

A professional deep dive into React runtime execution. Explore the Fiber reconciliation engine, understand the cost of useMemo and useCallback, write a custom list virtualizer, and optimize Context API render cycles.

Mastering React Performance: Internals, Memoization Pitfalls, and List Virtualization

A professional deep dive into Node.js memory leaks. Learn the internals of the V8 engine heap, analyze closure leaks, event emitter retention, and stream leaks with real-world debugging workflows.