Urban Andrej, Blockchain Developer, Rust & Solidity Specialist
C2 (Proficiency) English
Senior (5-10 years)
Zagreb,
Croatia
Summary
Software engineer with a Bachelor’s in Computer Science and 8 years of experience specializes in blockchain development, smart contracts, and DApps, mainly in Solidity and Rust. Demonstrated expertise in Ethereum and Solana ecosystems with significant projects such as a fully-featured NFT marketplace and the first multichain swap protocol. Excelled in developing secure, scalable solutions with 99% test coverage in Rust, contributing to the advancement of decentralized protocols. Adept in various technologies including Go, Move, Web3, DeFi, and smart contract auditing, positioning as a valuable asset for blockchain-centric roles.
Main Skills
Programming Languages
JavaScript Frameworks
UI Frameworks, Libraries, and Browsers
Python Frameworks
Android Libraries and Tools
PHP Frameworks
JavaScript Libraries and Tools
Ruby Frameworks
Databases & Management Systems / ORM
Cloud Platforms, Services & Computing
Azure Cloud Services
Industry Domain Experience
BlockChain and Decentralized Software
SDK / API and Integrations
Deployment, CI/CD & Administration
QA, Test Automation, Security
Virtualization, Containers and Orchestration
Methodologies, Paradigms and Patterns
UI/UX/Wireframing
Version Control
Mail / Network Protocols / Data transfer
Web/App Servers, Middleware
Work Experience
Senior Blockchain Developer, NFT Marketplace and Test-net App Chain
Duration: Jun 2023 - Mar 2025
Summary:
- Developed and maintained a fully-featured NFT marketplace using Rust within the Substrate framework
- Conducted smart contract audits and mentored junior engineers
Responsibilities: NFT functionality development, smart contract audits, mentoring
Technologies: Rust, Substrate
Smart Contract Engineer, Smart Contract Engineering and Protocol Optimization
Duration: Oct 2022 - May 2023
Summary: Deployed Rust-based smart contracts for decentralized applications, led Solana protocol optimization, and promoted secure data ownership for Koii Network.
Responsibilities: Smart contract development and deployment, decentralized protocol optimization, team collaboration
Technologies: Rust, Solana, Decentralized Protocols, Cryptography, Web3
Blockchain Developer, Multichain Swap Protocol
Duration: Aug 2021 - Jun 2022
Summary: Pioneered the first multichain swap protocol on Layer Zero and executed core smart contract implementations for secure cross-chain interactions.
Responsibilities: Smart contract implementation, multichain swap protocol development, security testing
Technologies: Solidity, Ethereum, Solana, Layer Zero Protocol
Blockchain Developer, Enjin Wallet 2.0 & NFT.io Marketplace
Duration: May 2020 - Jul 2021
Summary:
- Implemented EIP-1559 and various cryptocurrency support using Solidity and Rust in Enjin Wallet 2.0 development, contributed to NFT marketplace development
Responsibilities: Cryptocurrency system upgrades, blockchain infrastructure development, NFT marketplace contribution
Technologies: Solidity, Rust, EIP-1559, BEP-20, Substrate-SDK
Full Stack Engineer, Web Platform and API Development
Duration: May 2019 - May 2020
Summary: Led the development of Cape & Bay's primary web platform and APIs while maintaining database integrity and addressing system issues.
Responsibilities: Web platform design and implementation, database management, API development
Technologies: Node.js, Python, Django, Flask, React, GraphQL
Full Stack Developer, Pharmacy Store and Healthcare App
Duration: Apr 2018 - May 2019
Summary: Built a custom PHP framework for a pharmacy store app and contributed to the development and launch of a responsive website and storybook.
Responsibilities: Custom PHP framework development, RESTful API and GraphQL implementation, website launch
Technologies: PHP, Node, NGINX, HA Proxy, React, Vue.js
Education
- Saint Louis University
- Bachelor of Computer Science GPA: 3.8 / 4.0
- 2013 - 2017