Smart Contract Developer (Senior)

Placements24; Klerksdorp; On-site; ZAR 900,000 - 1,500,000; Full time

Benefits offered by this job

Health benefits

Career growth

Competitive salary

Job summary

Placements24 in South Africa seeks a Senior Smart Contract Developer in Klerksdorp to design, test, and deploy secure Solidity smart contracts for DeFi applications on Ethereum. You will work closely with product and engineering teams to deliver robust contracts and ensure high security standards.

As a senior member, you will mentor juniors, implement testing strategies with Hardhat/Truffle/Foundry, and stay updated on evolving DeFi protocols and EVM optimizations.

Qualifications

• Proven experience as a Smart Contract Developer
• Expert proficiency in Solidity
• Deep understanding of the Ethereum Virtual Machine (EVM)
• Experience with blockchain development frameworks like Hardhat, Truffle, or Foundry
• Knowledge of common smart contract patterns and security best practices (reentrancy, overflow/underflow)
• Familiarity with DeFi protocols and standards (ERC-20, ERC-721, etc.)
• Experience with version control systems like Git
• Strong analytical and problem‑solving skills
• Ability to work effectively in a team environment
• Bachelor’s degree in Computer Science or a related field, or equivalent practical experience

Responsibilities

• Develop, test, and deploy secure and gas‑efficient smart contracts using Solidity.
• Write comprehensive unit and integration tests for all smart contract code.
• Collaborate with frontend and backend developers to integrate smart contracts into dApps.
• Participate in the design and architecture of new blockchain features and protocols.
• Perform thorough code reviews to ensure quality, security, and adherence to best practices.
• Identify and mitigate potential vulnerabilities and risks in smart contracts.
• Optimize smart contract performance and upgradeability mechanisms.
• Stay up‑to‑date with the latest developments in Solidity, Ethereum, and the broader blockchain ecosystem.
• Troubleshoot and debug smart contract issues.
• Contribute to the technical documentation of smart contracts and related systems.

Skills

Solidity

EVM knowledge

Security best practices

DeFi knowledge

Smart contract testing

Team collaboration

Analytical thinking

Education

Bachelor's degree in Computer Science or related field

Tools

Hardhat

Truffle

Foundry

Git

Job description

About the Role

Our client, a rapidly growing fintech company specializing in decentralized finance (DeFi) applications, is looking for a talented Senior Smart Contract Developer. This position is based in Klerksdorp, North West , and offers an exciting opportunity to contribute to the development of innovative financial products built on blockchain technology. You will be responsible for writing, testing, and deploying secure, efficient, and robust smart contracts that form the core of our client's platform. This role requires a deep understanding of blockchain protocols, particularly Ethereum, and extensive experience with Solidity. You will work closely with a team of experienced engineers and product managers to bring cutting‑edge DeFi solutions to life. The ideal candidate is passionate about blockchain technology, possesses strong coding skills, and is committed to security and best practices in smart contract development.

Key Responsibilities

• Develop, test, and deploy secure and gas‑efficient smart contracts using Solidity.
• Write comprehensive unit and integration tests for all smart contract code.
• Collaborate with frontend and backend developers to integrate smart contracts into dApps.
• Participate in the design and architecture of new blockchain features and protocols.
• Perform thorough code reviews to ensure quality, security, and adherence to best practices.
• Identify and mitigate potential vulnerabilities and risks in smart contracts.
• Optimize smart contract performance and upgradeability mechanisms.
• Stay up‑to‑date with the latest developments in Solidity, Ethereum, and the broader blockchain ecosystem.
• Troubleshoot and debug smart contract issues.
• Contribute to the technical documentation of smart contracts and related systems.

Requirements

• Proven experience as a Smart Contract Developer, with a strong portfolio of deployed contracts.
• Expert proficiency in Solidity programming language.
• Deep understanding of the Ethereum Virtual Machine (EVM) and its nuances.
• Experience with blockchain development frameworks like Hardhat, Truffle, or Foundry.
• Knowledge of common smart contract patterns and security best practices (e.g., reentrancy, overflow/underflow).
• Familiarity with DeFi protocols and standards (ERC-20, ERC-721, etc.).
• Experience with version control systems like Git.
• Strong analytical and problem‑solving skills.
• Ability to work effectively in a team environment.
• A Bachelor's degree in Computer Science or a related field, or equivalent practical experience.

Benefits

Our client offers a competitive salary, comprehensive health benefits, and opportunities for rapid career advancement within a fast‑growing company. You will have access to cutting‑edge technologies and continuous learning resources. This role in Klerksdorp, North West , provides a chance to work on impactful projects in the rapidly evolving DeFi space. Join a collaborative and innovative team dedicated to pushing the boundaries of financial technology.