Blockchain Developer / Smart Contract Engineer

Rather Labs

Wilmington (DE)

On-site

USD 120,000 - 180,000

Full time

14 days+

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Benefits offered by this job

Healthcare benefits

Company computer

Paid holidays

Flexible working hours

Competitive salary

Career growth opportunities

Friendly and collaborative team

Job summary

Rather Labs is seeking a Smart Contract Engineer to join our blockchain engineering team in Wilmington. You will design, develop, test, and review smart contracts across EVMs and other ecosystems, partnering with auditors and product teams to build secure, scalable protocol software.

The ideal candidate brings hands-on experience with Solidity, DeFi protocols, and smart contract security, plus a security-first mindset and strong collaboration skills to ship production-ready code.

Qualifications

Proven experience writing and auditing Solidity/EVM contracts.
Hands-on testing with frameworks like Foundry or Hardhat.
Strong understanding of DeFi protocols and token standards.
Ability to design secure, maintainable smart contract code.
Experience reviewing contracts and identifying vulnerabilities.
Familiarity with common security tools and libraries (OpenZeppelin).
Excellent analytical thinking and clear communication.

Responsibilities

Design, develop, and maintain smart contracts for DeFi and blockchain apps.
Write secure, clean, efficient, and well-tested Solidity code.
Build and maintain automated tests with Foundry, Hardhat, Anchor, or similar.
Review contract logic, architecture, and protocol design.
Identify security risks, logic flaws, and attack vectors.
Analyze DeFi risks like flash loans, oracle manipulation, and MEV.
Use tools such as Slither, Mythril, Echidna, and Certora for security analysis.
Support audits, remediation, fix verification, and deployment.
Document decisions, security considerations, and implementation details.

Skills

Solidity/EVM

Foundry/Hardhat

DeFi protocols

Secure smart contracts

Testing/debugging

Smart contract security

OpenZeppelin familiarity

Analytical thinking/communication

Tools

Slither

Mythril

Echidna

Halmos

Manticore

Aderyn

Certora

Tenderly

OpenZeppelin

Job description

About the Role

Rather Labs is looking for a Smart Contract Engineer to join our blockchain engineering team and help build secure, scalable, and production-ready decentralized applications and protocols. In this role, you will design, develop, test, and review smart contracts across EVM and other blockchain ecosystems. You will collaborate closely with blockchain engineers, auditors, and product teams to build reliable smart contract systems, identify vulnerabilities, and improve protocol security, architecture, and performance. This position is ideal for someone with strong hands‑on smart contract development experience, a deep understanding of DeFi mechanics, and a security-first engineering mindset.

Responsibilities

Design, develop, and maintain smart contracts for DeFi and blockchain applications
Write clean, secure, efficient, and well‑tested Solidity code
Build and maintain automated tests using Foundry, Hardhat, Anchor, or similar frameworks
Review smart contract logic, architecture, and protocol design
Identify security risks, logic flaws, economic attack vectors, and trust assumptions
Analyze DeFi‑related risks such as flash loans, oracle manipulation, MEV, sandwich attacks, and governance risks
Use security and analysis tools such as Slither, Mythril, Echidna, Halmos, Manticore, Aderyn, Certora, and Tenderly
Support audits, remediation, fix verification, and deployment processes
Document technical decisions, security considerations, and implementation details

Requirements

Strong experience with Solidity and EVM smart contract development
Experience working with Foundry and/or Hardhat
Solid understanding of blockchain architecture, DeFi protocols, token standards, and smart contract security
Ability to write secure, efficient, and maintainable smart contract code
Experience testing, debugging, and reviewing smart contracts
Knowledge of common vulnerabilities such as reentrancy, access control issues, oracle risks, precision errors, and upgradeability risks
Familiarity with OpenZeppelin and secure smart contract development practices
Strong analytical thinking, problem‑solving skills, and clear communication

Nice to Have

Experience with Rust, TypeScript, Solana, Anchor, or NEAR
Experience building or auditing production DeFi protocols
Knowledge of formal verification, fuzz testing, symbolic execution, or property‑based testing
Experience with Ethereum, Arbitrum, Base, Optimism, Solana, NEAR, MultiversX, or other blockchain ecosystems
Experience with AMMs, lending protocols, bridges, staking systems, or governance mechanisms

What We Offer