I'm Hamza Yerrou, a Software Engineer: frontend and full-stack, with a strong eye for design and UX. 4+ years building production web products with React, Next.js and TypeScript, and now across the full stack with Java, Kotlin and Spring Boot. Founder of three self-built AI and SaaS products with real users, taken from product design and UI to backend, payments, launch and growth. Currently on the HSE core team at iMedia24 (DE).
A focused look at three recent engagements: what I shipped, the stack, and the outcomes that mattered.
Delivered 5+ Web3 & AI-focused apps for blockchain and crypto use cases. Integrated smart-contract interactions and wallet connections (Metamask, WalletConnect), and built real-time AI chat interfaces with an Express.js backend.
Now on the HSE (Home Shopping Europe) core team, building customer-facing features and contributing to Java, Kotlin and Spring Boot services. Before that, built the company's large-scale SaaS on Next.js + Tailwind, set up CI with GitHub Actions, and introduced Vitest and Cypress testing.
Improved core UI features for a large Vue.js app at GrooveDigital, refactored legacy code, and built a white-label system to dynamically swap logos, themes, and branding. Earlier at kreatinc: dynamic landing pages, dashboards, branded PDFs, and HTML email templates.
Three self-built AI and SaaS products, each taken from product design and UI to backend, payments, launch and growth.
AI-powered tool that creates and schedules short-form videos for TikTok, YouTube Shorts, and Reels. Designed, built and launched solo, from product and UI design to AI integration and backend.
An AI agent that roasts early-stage startup landing pages with brutal, actionable feedback. Built solo. Currently running the marketing: content, distribution, and growth experiments to push v2 to the next tier.
Free property & investment ROI calculator for Morocco. Currently working on a full rebranding and adding new features, expanding beyond the calculator with richer content and tooling.
Front-end is my main lane, but I'm comfortable across the stack. Plus SEO, digital marketing, and UI/UX from years of solo product work.
Four engagement shapes, from a quick sprint to a full-business delivery with a managed team. All include scoping, async daily updates, and a written handoff doc. Pricing is discussable and fixed up-front after a discovery call.
From €1,800 · 1–2 weeks
Price on scope · 4–10 weeks
Discussable · ongoing
€12–20 / hr · weekdays · higher on weekends
Predictable, async-first, and over-communicated. You'll always know what I'm working on and what's blocking it.
30-min call + a written brief from me within 48 hrs covering scope, risks, and a fixed price.
Lo-fi → hi-fi in Figma or directly in code. Daily Loom updates. You approve before I build.
Daily commits to a staging URL. End-of-week summary, list of trade-offs, list of next-week's work.
Production deploy, written walkthrough, Loom for non-technical stakeholders, 14-day bugfix window.
Last edit: Sep 24, 2026.
Joined HSE's core team: customer-facing features with a focus on UI quality, plus backend work in Java, Kotlin and Spring Boot.
My AI short-form video tool is live at krumeno.com. Now iterating on creation, scheduling, and growth.
Shipping backend services end to end at work, alongside the React and Next.js front-end I build every day.
Short essays on shipping, freelance ops, and what I learn the hard way.
Most front-end projects don't fail because of bad code. They fail because nobody knew when to call it done.
Read essay →2026 · 03 · 22 · 7 minWhat I learned shipping five Web3 apps. Almost every wallet flow gets the same eight things wrong.
Read essay →2026 · 02 · 14 · 11 minThe exact stack I'd reach for if I were starting a new SaaS product on a Monday. Trade-offs, not religion.
Read essay →The questions that come up in most intro calls, answered up front.
Have a project, an idea, or just want to chat about the front-end craft? Pick whatever channel works for you. I read everything within 24 hrs.