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Senior Solidity Engineer at Spearbit. Remote Location: Remote - Anywhere . We're collaborating with a standout company that's building cutting-edge infrastructure for decentralized credit markets. Their platform blends blockchain-based smart contracts with intuitive, scalable financial products — bringing institutional-grade solutions to DeFi. The protocol is live and actively used by leading participants across the digital asset ecosystem.. The Role. We are seeking an experienced Solidity Engineer to join a highly skilled team of smart contract developers. You’ll be contributing directly to the evolution of a sophisticated, secure, and composable lending protocol, helping to shape and ship new features while maintaining high performance and security standards.. You’ll be designing new DeFi primitives, building modular and gas-optimised smart contracts, and implementing secure systems that can handle institutional scale.. Responsibilities . Architect, implement, and test secure smart contracts in Solidity. Prepare smart contracts for external security audits and address feedback. Respond to vulnerabilities by simulating exploit scenarios and defining mitigations. Build and maintain keeper systems for contract automation. Monitor contract activity for both security and operational insights. Conduct in-depth code reviews with a strong focus on safety and optimisation. Stay current on developments in Ethereum tooling, standards, and protocol-level changes. Work cross-functionally with protocol, product, and front-end teams to deliver features. Requirements. Minimum 2 years of professional Solidity development experience. Minimum 4 years of total software engineering experience. Proven experience deploying to Ethereum mainnet. Strong grasp of proxy patterns, upgradability, and modular contract design. Familiarity with testing frameworks such as Foundry or Hardhat. Strong attention to test coverage, fuzzing, and secure code practices. Deep passion for the DeFi ecosystem. Solid knowledge of Git-based repo workflows. Fluent in English and excellent communication skills. Team-first mindset with a high level of ownership and initiative. Compensation & Benefits. Base salary paid in local fiat or crypto (you choose!) . Token allocation . 30 days PTO annually. Remote-first team with flexible work hours. Optional WeWork or co-working stipend. Choose between contract or full-time employment, with local statutory benefits where applicable. Open, transparent, and collaborative work culture. Annual offsite retreats. Funding for personal learning and development. If you're passionate about building secure and scalable systems in the Web3 space, and you're ready to contribute to the future of institutional finance on-chain, we’d love to hear from you.