Senior Blockchain Developer - Smart Contracts & DeFi

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

About the Role

Our client, a rapidly expanding innovator in the decentralized finance (DeFi) space, is seeking a highly skilled and motivated Senior Blockchain Developer to join their dynamic team. This pivotal role will be instrumental in architecting, developing, and deploying cutting-edge smart contracts and blockchain solutions. You will work at the forefront of blockchain technology, contributing to projects that are reshaping the future of finance. The ideal candidate possesses a deep understanding of blockchain protocols, a passion for secure and efficient code, and a collaborative spirit. This position offers a fantastic opportunity to make a significant impact in a growing industry and work within a forward-thinking organization. The role is based in our bustling **Midrand, Gauteng** office, fostering a collaborative and innovative work environment.

Key Responsibilities

• Design, develop, test, and deploy secure and efficient smart contracts on various blockchain platforms (e.g., Ethereum, Binance Smart Chain, Polygon).
• Write high-quality, maintainable, and well‑documented code using languages such as Solidity, Vyper, or Rust.
• Collaborate with cross-functional teams, including product managers, designers, and other engineers, to define and implement new features and protocols.
• Conduct rigorous code reviews and security audits to ensure the integrity and safety of deployed contracts.
• Stay abreast of the latest developments in blockchain technology, cryptography, and DeFi trends.
• Optimize smart contract performance and gas efficiency.
• Troubleshoot and resolve issues related to smart contracts and blockchain infrastructure.
• Contribute to the overall architecture and technical strategy of our blockchain initiatives.

Requirements

• Bachelor's or Master's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• Proven experience (5+ years) in software development, with at least 3 years focused on blockchain development and smart contract creation.
• Proficiency in Solidity and experience with blockchain development frameworks (e.g., Hardhat, Truffle, Foundry).
• Strong understanding of blockchain fundamentals, consensus mechanisms, and token standards (ERC-20, ERC-721, etc.).
• Experience with DeFi protocols and concepts.
• Familiarity with security best practices for smart contract development.
• Excellent problem‑solving and analytical skills.
• Strong communication and teamwork abilities.
• Experience with version control systems (e.g., Git).

Benefits

• Competitive salary package and performance-based bonuses.
• Comprehensive health insurance and retirement benefits.
• Opportunities for professional development and continuous learning.
• Generous paid time off and flexible working arrangements.
• Access to cutting‑edge technology and a stimulating work environment in **Midrand, Gauteng**.
• Chance to be part of a pioneering company in the blockchain revolution.
• Regular team‑building events and a vibrant company culture.