+ Welcome to the studio

I build Web3 & full-stack products that ship

I'm Toni — a Mostar-based developer who designs, builds and scales modern software through my studio, dumancic.dev.

Start a projectView work
8 chainsNon-custodialWeb3SolanaHardware

A non-custodial crypto payment platform — in-store POS with a BLE hardware signing device, hosted e-commerce checkout and trustless on-chain settlement across 7 EVM chains and Solana.

Read case study↗
Toni Dumančić speaking at MoneyMotion 2025
Founder · dumancic.dev
Toni Dumančić
Let's talk
8
Awards & hackathon wins
10+
Products shipped
3+
Years building
2
Startups founded
+ Recognized at

Awards, hackathons & stages across the Balkan tech scene.

+ Services

From first idea to production

End-to-end software — I design, build and scale Web3 and full-stack products that hold up in the real world.

Smart contracts, DeFi protocols, NFT platforms and dApps built with Solidity, Rust and modern Web3 tooling.

SolidityRustSolanaEthereum

End-to-end web apps with React, Next.js, Node.js and TypeScript — built around clean UX and solid architecture.

Next.jsReactNode.jsTypeScript

Scalable cloud setups, CI/CD pipelines, containerization and infrastructure automation on AWS, Azure and GCP.

DockerKubernetesAWSGitHub Actions

Architecture reviews, tech-stack decisions, performance work and honest technical guidance.

ArchitectureAuditsStrategy
Industries
StartupsFintechWeb3 / DeFiSaaS PlatformsHospitalityEnergyHealthTechE-commerce
Stack
Next.jsReactTypeScriptSolidityRustNode.jsPostgreSQLDockerAWS
+ Selected work

Products I've designed & shipped

CrypTap — merchant POSCrypTap — merchant POS
Web3SolanaPayments

CrypTap – Non-Custodial Crypto Payment Platform

The project I'm proudest of: a complete non-custodial crypto payment platform built end-to-end — smart contracts on 7 EVM chains and Solana, an in-store POS with a BLE hardware signing device and ESP32 firmware, a hosted e-commerce checkout with trustless permissionless settlement, WooCommerce/Shopify plugins, and merchant/owner/admin dashboards. CrypTap never holds, signs for, or transmits merchant funds — and I built every layer of it.

TAPP — product UITAPP — product UI
SaaSNext.jsHospitality

TAPP – QR Menu, Online Ordering & Digital Business Card Platform

Full-stack SaaS platform for digitizing restaurant menus via QR codes with table-side online ordering, featuring multi-language support, real-time notifications, analytics, and custom branding for hospitality businesses in Bosnia and Herzegovina.

LetsGo — mobile appLetsGo — mobile app
MobileAIFitness

LetsGo Fitness – Your Personal Trainer & Nutritionist

Building a personalized fitness and nutrition app that adapts to users’ goals, progress, and lifestyle.

All projects ↗
+ Recognition

Trusted by the people I build alongside

Founders, investors and community leaders across the Balkan tech scene.

★★★★★
Toni is one of the most promising young developers in the region. His work on blockchain and community projects through Crypto.ba speaks for itself.
Nedžad SmajićNedžad SmajićFounder, Crypto.ba
★★★★★
I was genuinely impressed by Toni and his team. As I said on stage — this is a young, capable group with the potential to build world-class solutions.
Edin MehićEdin MehićEntrepreneur & Investor
★★★★★
I told Toni he might be the first unicorn founder from Bosnia. The clarity, vision and execution he showed on stage were world-class.
Josip VolarevićJosip VolarevićSuperteam Balkan
+ Awards & recognition
★3rd place

Superteam Balkan Startup Village

Demo Day · Split 2025

★Most Innovative

British Council — AI Mostar

AI Mostar Conference

★Gold Medal

ARCA Exhibition of Inventions

Zagreb · 2023 & 2024

Latest from the blog

All posts ↗
July 15, 2026

CrypTap: kako sam izgradio non-custodial crypto payment platformu — od POS uređaja do e-commercea

Read article ↗
January 15, 2026

Kada AI prekoračuje granice: Claude Cowork skandal i što to znači za nas developere

Read article ↗
+ FAQ

A few quick answers before we talk

It depends on scope, but most projects run 4–12 weeks from kickoff to launch. After our first call I’ll give you a clear timeline with milestones.

I keep it simple: a short discovery call, a written scope and timeline, then steady progress with regular check-ins so you always know where things stand.

Mostly Next.js, React, Node.js and TypeScript on the web side, plus Solidity and Rust for blockchain. I pick the stack that fits the problem, not the other way around.

Yes — I’m comfortable dropping into an existing codebase and workflow, whether that’s a short contract, a specific feature, or ongoing support.

Have a project in mind?

Opens your mail app · or write me at info@dumancic.dev
+ Contact

Let's talk.

Tell me about your project — whether it's a web app, a blockchain product, or an idea that just needs shipping.

Quick response
I read every inquiry and reply within 24 hours.
Clear next steps
You'll get a tailored plan with timeline, scope and pricing.
Toni Dumančić
Founder · dumancic.dev
Toni Dumančić
Schedule a call