Web Development
Custom-built marketing, service, and ecommerce sites, from single-page brochures to full multi-sector platforms.
Company Portfolio
Web, backend & Web3
product development.
Kotar DOO is a Belgrade-based development studio. We design, build, host, and maintain digital products end-to-end — from service and marketing websites to backend systems and blockchain applications.
About Kotar
Full-cycle product development
Kotar DOO is a Belgrade-based development studio. We design, build, host, and maintain digital products end-to-end — from service and marketing websites to backend systems and blockchain applications — for clients across retail, construction, and Web3.
Services
What we do
UI/UX Design
Interface and experience design tailored to how each client's customers actually browse, buy, and contact them.
Backend Systems
Application logic, data handling, and integrations that sit behind the interface — built to match real business processes.
Web3 & Blockchain
Wallet integration, multi-chain payment flows, token sale platforms, and other on-chain product development.
Hosting & Infrastructure
We host and manage the infrastructure for everything we build, rather than handing clients off after launch.
Maintenance & Support
Ongoing updates, monitoring, and support so client sites and platforms keep running after go-live.
Selected Work
Products we've shipped & still run
Construction & Live Events Infrastructure
Monter2019
Monter2019 provides scaffolding, staging, and structural installation services for construction sites, industrial plants, and live events across Serbia — including landmark work at Hram Svetog Save, Beograd na vodi, and Rafinerija Pančevo. Kotar designed and built the company's full web presence and continues to host and maintain it.
- Multi-sector site architecture (construction, industrial, events, geological services)
- Project gallery and case-study imagery system
- Client and partner showcase
- Lead-capture contact form
- Ongoing hosting and maintenance
Consumer Electronics — Resale & Repair
MajorMob
MajorMob buys, sells, and repairs iPhone and Samsung devices, and buys and sells Sony PlayStation 5 consoles, out of a Belgrade storefront. Because the business runs on in-person transactions and phone-based inquiries rather than online checkout, the site was built around service clarity and direct contact — buyback terms, repair services, and current inventory routed through phone and Instagram.
- Service-line pages: buyback, repair, and sales
- Device condition and pricing guidance content
- Phone-first contact and lead generation
- Hosting and maintenance
Web3 — Token Presale Platform
Drivx
LocationRemote / on-chain
ScopeFull-stack build, wallet integration & hosting
Live sitedrivxtoken.com
Drivx is a blockchain-based token offering built around a rent-a-car business model — the most technically demanding of Kotar's public projects: a live, transactional Web3 application. Users connect a wallet, pay in one of several cryptocurrencies, and receive tokens automatically at a computed rate plus bonus — all with live pricing and progress tracking, alongside the roadmap, whitepaper, FAQ, media, and team sections a token launch requires.
- Multi-chain wallet connect and purchase flow (BNB, ETH, USDT, USDT-ETH, SOL)
- Real-time token pricing and bonus calculation engine
- Live presale progress tracking
- Full site build: roadmap, whitepaper, FAQ, media, and team sections
- Hosting and infrastructure
Get in touch
Let's build the next one.
Kotar DOO takes projects from design through to a live, hosted, maintained product — across web, backend, and Web3.
or email us directly at office@kotar.rs