KARELGUSTIN
I engineer | that ship.
I don't write code — I architect solutions. From system design to pixel-perfect UI, I own every layer of the stack. Fast execution. Clean architecture. Real results.
Think systems. Ship products.
Most engineers write code. I engineer outcomes. I see the full picture — from database schema to conversion funnel — and I build the entire thing.
I don't wait for specs. I identify the problem, architect the solution, design the experience, and ship it. Frontend, backend, infrastructure, marketing — I own it all. That's what agentic engineering means: complete autonomy, complete accountability.
My edge? I think like a founder and execute like an engineer. I choose the right database for the use case, not the trend. I design for conversion, not just aesthetics. And I ship fast — becausespeed with intention beats perfection every time.
How I Work
System Design
Product & Design
Execution
Work that speaks for itself.
Real products. Real users. Real results.
Brow Shape Official Shopify Store
Complete e-commerce transformation from concept to launch, combining strategic marketing thinking with technical execution and design excellence.
View Project
Pocket Business IOS
Pocket-business.com automates as much bookkeeping as possible, so you spend a minimum amount of time on accounting each quarter.
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MijnBuitenplan Shopify Store
Shopify store for garden tiles with a custom calculator, layer-based order logic, and interactive product visualization, empowering customers to design their dream driveway.
View ProjectBuilt through doing.
10 years of shipping products, solving real problems, and learning by building.
Agentic Engineering & System Architecture
Independent Projects
Mastered agentic workflows. Think in systems, not syntax. Build production apps while deepening architecture expertise — database design, API design, tech stack selection.
- Agentic coding workflows — rapid dev, maintained quality
- Production apps with AI-assisted development
- Database selection, API design, infrastructure decisions
- AI-powered tools for real business use cases
Full Stack Foundation
Self-Directed Learning
Mastered HTML, CSS, JavaScript, React. Balanced system thinking with hands-on implementation.
- Modern JavaScript (ES6+) and React architecture
- Responsive interfaces — CSS Grid, Flexbox
- Bridged system design with implementation
Shopify Custom Development
Custom Sections & Plugins
Built custom sections and plugins from scratch. Learned component architecture and platform systems.
- Custom Shopify sections — Liquid templating
- Custom plugins extending Shopify functionality
- Component-based architecture patterns
Shopify Theme Customization
E-commerce Store Development
Customized themes to match designs. Combined marketing strategy with technical execution.
- Conversion-optimized storefronts
- Marketing-first design approach
- E-commerce user psychology expertise
Shopify E-commerce Development
Store Building & Marketing
Built complete stores with marketing focus. Learned customer journey optimization.
- Multiple Shopify stores — product-focused
- Conversion optimization expertise
- Marketing strategy and sales psychology
Web Development Exploration
Learning Through Building
Built multiple websites. Learned what makes sites effective through experimentation.
- Multiple platforms and approaches
- Hands-on learning and iteration
First E-commerce Venture
Garden Tiles — WooCommerce
Built first e-commerce store from scratch. Learned fundamentals through dedication.
- Complete WooCommerce store
- WordPress, PHP, e-commerce fundamentals
Let's build something.
Looking for someone who ships? I take ownership from day one — no hand-holding required.