FREELANCE · REMOTE
Blockchain Engineer
On Time Technology Ltd · Dublin, Ireland
Freelance · Long-term contract
Posted 18 May 2026
Engineer the smart-contract and on-chain infrastructure powering Custodiy and the tokenised commodity rails behind Freety.
About the role
You will design, implement and audit smart contracts for custodial wallets, tokenised commodities and trust-minimised settlement flows. Expect to work across EVM L1/L2 networks, cryptographic primitives and high-assurance Solidity patterns.
What you bring
4+ years of Solidity / EVM smart-contract engineering.
Proven security mindset (Foundry / Slither / formal verification a plus).
Experience with custodial wallet architectures, ERC-20/721/1155 and tokenisation.
Understanding of MEV, gas-optimisation and L2 ecosystems (Arbitrum, Base, etc.).
Strong written English and ability to ship production-grade audited code.
Tech stack
Working arrangements
Freelance · Long-term contract. All roles are 100% remote. We prefer an EU-friendly time-zone overlap of at least 4 hours per day, but exceptional senior candidates worldwide are welcome to apply. Dublin HQ is available for those who want it, with no office mandate.
These are independent-contractor engagements, billed monthly. Competitive day-rates, monthly invoicing and transparent contracts.
How to apply
Use our application form with this role selected, or email your introduction, LinkedIn profile and portfolio to info@ott4future.com.