Solidity Developer
Blockchaindeveloper · Web3 Specialist
Senior Solidity Engineer with 6+ years in blockchain, securing $15M+ on‑chain. Trusted by CookieDAO and VitaDAO; open‑source contributor (OpenBlock, PossumLabs). Core expertise in Solidity, plus backends and frontends. Cross‑chain work with Wormhole and LayerZero. Known for rigorous testing, simulations, debugging, and security‑first development of scalable protocols.
Experience: 5 years
Yearly salary: $110,000
Hourly rate: $50
Nationality: 🇵🇱 Poland
Residency: 🇵🇱 Poland
Experience
BACKEND / SOLIDITYDEVELOPER
FluidAI 2023 - 2024
Developed, tested, and debugged smart contracts for DEX use cases. Optimized contracts achieving a 9% gas reduction. Built backend services for DEX aggregation using Nest.js. Collaborated with the AI team to improve price prediction efficiency by 3%.
SOLIDITYENGINEER
10Clouds 2022 - 2023
Delivered DeFi and legal-tech smart contracts and DApps. Conducted code reviews and security research, identifying and mitigating 4 critical vulnerabilities. Co‑authored comprehensive smart contract audits and ensured adherence to best practices. Provided technical blockchain consulting to clients.
BLOCKCHAINDEVELOPER
Nextrope 2022 - 2022
Integrated Robovault delta‑neutral strategies after R&D on emerging DeFi products. Implemented cross‑chain features to enhance interoperability. Patched proxy contracts to resolve critical issues with minimal downtime. Led internal Web3 workshops for the engineering team.
BLOCKCHAINDEVELOPER· DATAENGINEER
Tubbly 2020 - 2022
Developed and maintained smart contracts for an app rewarding physical activity. Collected 100k+ POIs via OpenStreetMap and built internal data tools to boost team efficiency.
DATAENGINEER
Coinfirm 2019 - 2022
Aggregated and cleaned data from 15+ sources (blockchains, financial institutions, APIs). Shipped geolocation for 2M crypto addresses, expanding product capabilities. Automated analytics, saving 400 hours/month ($48k/year).
Skills
javascript
python
solidity
english