Toni Dumančić
I’m a Mostar-based Web3 and full-stack developer who likes building things that actually ship — scalable, secure, and genuinely useful. I work across blockchain, SaaS platforms, and cloud infrastructure, and I spend a good chunk of my time on open-source projects and the local tech community.
Superteam Balkan
2025 – Present- Member of Superteam Balkan — the regional Solana community supporting builders, founders and contributors across the Balkans.
- Built RENTL and SolarSurge as submissions for Colosseum Solana hackathons — RENTL auctions ad space on any surface (settled in USDC), and SolarSurge turns surplus solar energy into crypto rewards via DePIN.
- SolarSurge earned 3rd place at the Superteam Balkan Solana Startup Village (Split 2025).
- Pitched RENTL at the Superteam Balkan Demo Day 2026 in Belgrade (30 teams, 100+ in the room, 2.3k watching live) and earned a Judge’s Honorable Mention.
Dumancic.dev
2024 – Present- Founded dumancic.dev as a hub for personal and collaborative projects in blockchain, AI, and web infrastructure.
- Created Cirql — an AI-powered networking app for conferences, enabling smart attendee matching, meeting scheduling, and live notifications.
- Built Tapp — a SaaS platform that digitizes menus and enables contactless ordering for cafes, restaurants, and hotels.
- Deliver open-source tools and SaaS prototypes that combine innovation with real-world use.
Crypto.ba
2023 – Present- Active contributor to Crypto.ba — Bosnia’s leading blockchain community fostering crypto adoption, education, and innovation.
- Worked on infrastructure and integrations across RuXCrypto (RXC) and its ecosystem platforms including RXCGames and Cex.ba.
- Supported RXC technical development during its listing on Whitebit, with trading pairs such as RXC/USDT, BTC, ETH, and BAM.
- Collaborated on expanding blockchain accessibility, transparency, and education across the region.
CertHub
2024 – Present- Led development of CertHub — a SaaS platform built on ChainVerify for blockchain-based document verification.
- Designed backend architecture, APIs, and dashboards supporting scalable multi-chain workflows.
- Presented the public pilot at MoneyMotion 2025, demonstrating live verification.
Marionette.dev
2025 – Present- Manage and scale Marionette’s cloud infrastructure, CI/CD pipelines, and containerized services.
- Implement automated deployment, monitoring, and alerting systems to ensure reliability.
- Collaborate with developers to optimize backend performance and streamline workflows.
Next.js & React
Fast, scalable, SEO-optimized web apps using Next.js, React, Tailwind CSS, and state management with Redux and Zustand.
Blockchain (Solana & Ethereum)
Smart contract development (Solidity, Rust), wallet integrations, dApp architecture, and interaction with blockchain APIs.
Backend & API Development
Node.js, Express, RESTful and GraphQL API design, database management (PostgreSQL, MongoDB), and scalable microservices.
DevOps & Cloud Infrastructure
CI/CD pipelines (GitHub Actions), containerization (Docker, Kubernetes), cloud platforms (AWS, DigitalOcean), monitoring and automation.