Senior Smart Contract Developer (Solidity Expert)

Placements24; LegKraal Gate; On-site; ZAR 1,200,000 - 2,400,000; Full time

Benefits offered by this job

Competitive salary

Health insurance

Relocation assistance

Professional development budget

Job summary

Placements24 is seeking a Senior Smart Contract Developer in Mahikeng, North West, South Africa to design, implement, and audit secure DeFi-grade contracts.

You will optimize gas, lead security reviews, and mentor junior engineers while collaborating with product and design teams to deliver scalable blockchain solutions.

Qualifications

• Bachelor's or Master's degree in Computer Science, Engineering, or related field, or equivalent practical experience.

Responsibilities

• Design, develop, test, and deploy production-grade smart contracts using Solidity on EVM-compatible blockchains.
• Conduct rigorous code reviews and security audits of smart contracts to identify and mitigate vulnerabilities.
• Collaborate with product managers, designers, and other engineers to translate business requirements into robust smart contract logic.
• Develop and maintain comprehensive unit and integration tests for smart contracts.
• Optimize smart contracts for gas efficiency and performance.
• Stay ahead of the curve on new developments in smart contract languages, blockchain protocols, and security best practices.
• Contribute to the architectural design of new blockchain features and protocols.
• Troubleshoot and resolve issues related to smart contract deployments and on-chain operations.
• Mentor junior developers and share knowledge on smart contract development and security.

Skills

Analytical skills

Problem solving

Debugging

Team collaboration

Education

Bachelor's or Master's in CS/Engineering

Tools

Hardhat

Truffle

Foundry

Ethers.js/Web3.js

Job description

About the Role

Our client, a leader in decentralized finance (DeFi) and blockchain innovation, is seeking a highly experienced Senior Smart Contract Developer with deep expertise in Solidity to join their core engineering team in Mahikeng, North West . This role is pivotal in designing, developing, and auditing secure, efficient, and scalable smart contracts that form the backbone of our client's cutting-edge financial products. You will work on complex challenges, contribute to architectural decisions, and play a key role in shaping the future of decentralized finance. The ideal candidate is a meticulous coder with a strong understanding of blockchain security and best practices.

Key Responsibilities

• Design, develop, test, and deploy production-grade smart contracts using Solidity on EVM-compatible blockchains.
• Conduct rigorous code reviews and security audits of smart contracts to identify and mitigate vulnerabilities.
• Collaborate with product managers, designers, and other engineers to translate business requirements into robust smart contract logic.
• Develop and maintain comprehensive unit and integration tests for smart contracts.
• Optimize smart contracts for gas efficiency and performance.
• Stay ahead of the curve on new developments in smart contract languages, blockchain protocols, and security best practices.
• Contribute to the architectural design of new blockchain features and protocols.
• Troubleshoot and resolve issues related to smart contract deployments and on‑chain operations.
• Mentor junior developers and share knowledge on smart contract development and security.

Requirements

• Bachelor's or Master's degree in Computer Science, Engineering, or a related technical field, or equivalent practical experience.
• Minimum of 6 years of professional software development experience, with a minimum of 4 years focused exclusively on smart contract development using Solidity.
• Demonstrable experience in developing and deploying complex DeFi protocols, NFTs, DAOs, or other sophisticated smart contract systems.
• Deep understanding of Ethereum Virtual Machine (EVM) architecture, gas mechanics, and security best practices.
• Proficiency with smart contract development tools and frameworks such as Hardhat, Truffle, Foundry, and Ethers.js/Web3.js.
• Strong knowledge of common smart contract vulnerabilities and patterns for their prevention and detection.
• Excellent analytical, problem-solving, and debugging skills.
• Exceptional communication and collaboration skills, capable of working effectively within a team in Mahikeng, North West .
• Experience with formal verification tools is a plus.

Benefits

• Highly competitive salary with significant bonus and potential equity options.
• Comprehensive health, dental, and vision insurance.
• Opportunity to work at the forefront of DeFi and blockchain innovation.
• Professional development budget and opportunities for continuous learning.
• Dynamic and collaborative work environment.
• Relocation assistance may be provided for exceptional candidates.