in Python, including async/await and scalable system design Knowledge of DeFi and blockchain (AMMs, MEV, liquidations, smart contracts) Experience with distributed systems and microservices Ability to read Solidity and understand on-chain logic Based in or willing to relocate to London +44 3300 522 127 sean@cwtalentsolutions.com More ❯
Contract Solidity Developer Location: 5 Days p/w in London? Duration: 12 Month Contract? IR35: Outside IR35? Rate: £500p/d - £700p/dOpus is partnering with a leading investment bank on an exciting new venture, which is due to kick off in 2026.They’re building a Digital Assets Division focused on Blockchain, Ethereum, and cutting-edge digital solutions. … To kick things off, they’re assembling a small, elite team and are on the lookout for experienced Solidity Developers who can help shape the future of digital finance.If you’ve worked with Solidity and have written smart contracts on Ethereum and other compatible networks, this is your chance to make an impact from day one.??? Tech Stack: Solidity Ethereum More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
Northampton, Northamptonshire, UK Hybrid/Remote Options
Deel
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
Gloucester, Gloucestershire, UK Hybrid/Remote Options
Deel
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
/off-ramps, networks, compliance vendors). Contribute to smart contracts that power real financial operations (escrow, payouts, invoicing, treasury automation). Work with modern blockchain dev stacks: Ethereum, Solidity, Truffle/Hardhat, L1/L2 frameworks (Arbitrum, Base, Polygon, Optimism, etc.) Design hybrid Web2 Web3 architectures connecting Deel's ledger, banking rails, and chain-based flows. Must Have Professional … limiting, event/queue-driven architectures. Experience in compliance-sensitive environments (KYC, AML, transaction monitoring). 4+ years of backend or full-stack engineering experience. Bonus Points Experience with Solidity, smart contracts, Truffle/Hardhat, EVM development, or L1/L2 scaling frameworks. Built or integrated custodial wallets, exchanges, or on/off-ramp processes. Experience with treasury, FX, reconciliation More ❯
