Senior DeFi Blockchain Engineer — Smart Contracts & Security

Placements24; Midrand; On-site; ZAR 1,200,000 - 2,000,000; Full time

Benefits offered by this job

Health insurance

Retirement benefits

Flexible PTO

Professional development

Midrand office access

Team events

Job summary

Placements24 in Midrand, Gauteng, seeks a Senior Blockchain Developer to architect, develop, and deploy secure smart contracts across Ethereum-compatible platforms. You will design robust solutions and collaborate with cross-functional teams to advance DeFi initiatives.

The role requires 5+ years of software experience with 3+ years in blockchain, solid Solidity, and familiarity with Hardhat/Truffle/Foundry; deep knowledge of ERC-20/ERC-721, security best practices, and Git.

Qualifications

• 5+ years of software development experience, with 3+ years in blockchain development and smart contracts.

Responsibilities

• Design, develop, test, and deploy secure smart contracts on Ethereum-compatible platforms.
• Write maintainable, well-documented code using Solidity, Vyper, or Rust.
• Collaborate with product managers, designers, and engineers to implement new features.
• Conduct code reviews and security audits to ensure contract integrity.
• Stay updated on blockchain tech, cryptography, and DeFi trends.
• Optimize gas efficiency and troubleshoot contract issues.
• Contribute to architecture and technical strategy of blockchain initiatives.

Skills

Solidity

DeFi

Security best practices

Code reviews

Git

Ethereum/BNB/Polygon

Analytical thinking

Team collaboration

Education

Bachelor's or Master's in CS/Engineering

Tools

Hardhat

Truffle

Foundry

Vyper

Rust

Job description

Placements24 in Midrand, Gauteng, seeks a Senior Blockchain Developer to architect, develop, and deploy secure smart contracts across Ethereum-compatible platforms. You will design robust solutions and collaborate with cross-functional teams to advance DeFi initiatives.

The role requires 5+ years of software experience with 3+ years in blockchain, solid Solidity, and familiarity with Hardhat/Truffle/Foundry; deep knowledge of ERC-20/ERC-721, security best practices, and Git.