Demyd Hanenko — Developer Portfolio

DemydHanenko

Web Dev

UI·UX

Mobile

About

I'm a full-stack developer who enjoys turning complex problems into simple, elegant solutions — performant web apps, clean code, thoughtful UX.

When I'm not coding, you'll find me exploring new tech, contributing to open-source, or leveling up through side projects.

Experience

10+ years

Education

Computer Science & AI

Status

Open to offers

Résumé

Download CV

Selected Work

Joji Health

The marketing site for a health app that pulls medical records, appointments, and discharge instructions into one place — connect your providers, record a visit, follow a day-by-day recovery plan. Hand-coded as a single static page with no framework and no build step: semantic HTML, one local stylesheet, and ~150 lines of vanilla JavaScript driving the scroll-pinned feature stepper, the marquee, and the mobile menu. Self-hosted fonts and zero third-party requests — no CDN, no analytics, no trackers — the right posture for a product built around protected health data, and it keeps the first load instant.

HTMLCSSVanilla JSStatic

Visit Site

La Rosa de Sarón

The website of a dulcería & pastelería in Torrevieja, Spain — custom cakes, artisan sweets, breakfasts, and coffee. A hand-coded static site with zero framework overhead: semantic HTML, vanilla CSS and JavaScript, self-hosted fonts, and responsive WebP images, deployed on Vercel. It posts near-perfect Google PageSpeed scores — 100 performance on desktop, 99 on mobile, and 100 for SEO and best practices — meaning instant loads and strong search visibility.

HTMLCSSJavaScriptVercel

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Fiesta Alert

A Telegram bot for the Ukrainian community in Spain that sends reminders about upcoming holidays — national, regional, and city-level, plus local festivals. Users pick their region and city and get notified 7 days ahead, 1 day ahead, and on the day itself, in private chats or groups.

Node.jsTelegram Bot APISupabaseZodVitest

Open Bot

Plus more projects built under NDA or as part of in-house product teams — not listed here for confidentiality reasons.

Your new project

Have an idea worth building?

I design and develop fast, modern websites and web apps — tailored to your brand, crafted with care, and engineered to last.

Stack

Frontend

React / Next.js / TypeScript / Tailwind CSS / SCSS / Framer Motion / Web3 / ethers.js / Wagmi

Backend

Node.js / Laravel / PostgreSQL / MongoDB / Prisma / REST APIs / GraphQL / WebSockets

Tools & DevOps

Git / Docker / AWS / Vercel / CI/CD / Linux / Figma

Other

English C1 / Testing / Agile / Scrum / UI/UX Design

Contact

Let's work together.

Got something interesting in mind — a new role, a freelance project, or a collaboration? Find me everywhere as @eisenheim94.

ganenko94@gmail.com