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Remote Senior Solidity Engineer

at Spearbit

Posted 1 day ago | 3 applied

Description:

  • We are collaborating with a standout company that is 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.
  • We are seeking an experienced Solidity Engineer to join a highly skilled team of smart contract developers.
  • You will contribute 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 will design new DeFi primitives, build modular and gas-optimised smart contracts, and implement secure systems that can handle institutional scale.
  • Responsibilities include architecting, implementing, and testing secure smart contracts in Solidity, preparing smart contracts for external security audits, and addressing feedback.
  • You will respond to vulnerabilities by simulating exploit scenarios and defining mitigations, build and maintain keeper systems for contract automation, and monitor contract activity for both security and operational insights.
  • Conducting in-depth code reviews with a strong focus on safety and optimisation is also part of the role.
  • You will stay current on developments in Ethereum tooling, standards, and protocol-level changes, and work cross-functionally with protocol, product, and front-end teams to deliver features.

Requirements:

  • A minimum of 2 years of professional Solidity development experience is required.
  • You should have at least 4 years of total software engineering experience.
  • Proven experience deploying to Ethereum mainnet is essential.
  • A strong grasp of proxy patterns, upgradability, and modular contract design is necessary.
  • Familiarity with testing frameworks such as Foundry or Hardhat is required.
  • You must have a strong attention to test coverage, fuzzing, and secure code practices.
  • A deep passion for the DeFi ecosystem is expected.
  • Solid knowledge of Git-based repo workflows is necessary.
  • Fluency in English and excellent communication skills are required.
  • A team-first mindset with a high level of ownership and initiative is essential.

Benefits:

  • The position offers a base salary paid in local fiat or crypto, depending on your choice.
  • You will receive a token allocation as part of your compensation.
  • The company provides 30 days of PTO annually.
  • It is a remote-first team with flexible work hours.
  • An optional WeWork or co-working stipend is available.
  • You can choose between contract or full-time employment, with local statutory benefits where applicable.
  • The work culture is open, transparent, and collaborative.
  • Annual offsite retreats are part of the benefits.
  • Funding for personal learning and development is also provided.