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Websites, admin panels and customer portals.

For businesses and teams building software: websites and web apps, end to end — structure, design, code, launch.

Based in Ukraine, working remotely. I reply within 40 minutes on weekdays.

Selected work

  1. This site

    Portfolio site, end to end

    Structure, copy, design, launch; built with Claude Code

    A portfolio site that explains what I do in five seconds. Built from scratch, two languages, two themes.

    Read the case

    Laptop on a concrete block with the sergiusdesign.com home page: the headline “Websites, admin panels and customer portals” and the “Tell me about your project” button, light theme
  2. LTE Socks

    Customer portal and admin platform

    Sole designer — UX, UI, information architecture, design system

    Two products, ten-plus sections, desktop and mobile, light and dark themes — on one design system the development team adopted.

    Read the case

    Monitor on a pale desk with the LTE Socks portal in the light theme: the Proxies section, cards of mobile proxies with port, address, plan and traffic left
  3. Tallio

    Concept: website and customer portal for e-invoicing

    Product design, brand, website and customer portal; built with Claude Code

    A website and portal for e-invoicing in Belgium, Poland and France: each person sees the rules of their own country, and every invoice shows where it is right now.

    Read the case

    Laptop on pale stone showing the Tallio home page: a yellow first screen with the headline “Send the invoice. See where it is.” and the portal below it

Two kinds of work

Web apps

Nothing gets lost between a designer and a developer.

Customer portals, admin panels, MVPs — the screens people work in for hours.

  • Research and information architecture
  • Interface design — desktop and mobile
  • Roles and permissions
  • A consistent look on every screen, light and dark themes
  • Next.js build

Websites, end to end

I design it and I build it.

Structure, design, code, launch. One person from the first screen to the live site.

  • Structure and information architecture
  • Design
  • Next.js build
  • A CMS your team can edit without me
  • Deploy, domain, analytics

Both start with a short first stage, where we write down the scope.

Services and prices

Five steps

The same order every time, whether it’s an admin panel or a website.

  1. First stage 3–⁠5 working days

    A written scope, the information architecture, and wireframes of the two key screens. If we stop here, the document is still yours, and any other developer can work from it.

  2. Structure

    User flows, roles and permissions, what each screen is for. We settle disagreements here — on wireframes, not on finished screens.

  3. One screen sets the pattern

    One screen first — designed and approved. It sets the rules for the rest: colours, type, buttons, states, light and dark themes. So new screens don’t drift apart.

  4. Screens

    Desktop and mobile, both themes, every state — empty, loading, error, long lists and tables.

  5. Build and launch

    I write the code with Claude Code and decide the structure, UX and UI myself. Next.js, a CMS your team can edit without me, deploy, domain, analytics.

Experience in numbers.

12

years in design

9+

of them in product

4

design systems

4

live products

One person for the whole project.

Twelve years in design, more than nine of them in product. For five years I led a team of five designers at an international streaming company. I’ve been mentoring since 2024. Now I build what I design.

You talk to the person doing the work. Nothing is relayed, nothing is lost between a manager and a designer.

More about me

Tell me about your project.

A few sentences are enough to start. If it turns out I’m not the right fit, I’ll say so.

What it is, who uses it, and what already exists. Add a link if you have one.

I use your message and email only to reply to you. Details in the privacy policy.

Or write directly

English in writing. I reply within 40 minutes on weekdays. Ukraine, remote.