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# Lead Software Engineer - Blockchain Developer

- **Company:** The Testing Site
- **Location:** Jersey City, NJ, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), JavaScript (Programming Language), Amazon Web Services, C++ (Programming Language), Software Debugging, Distributed Systems, Cryptographic Protocols, Monitoring of Systems, Key Management, Object-Oriented Software Development, Peer-To-Peer (P2P), Blockchain, Software Engineering, Systems Integration, Rust (Programming Language), Cloud Platform System, Git, Build Management, Kubernetes, Integration Frameworks, Ethereum, Web3.js, Software Version Control, Service Stack
- **Published:** November 6, 2026
- **Apply:** https://www.juju.com/job/28_25197_963ce3eb2b4fd21a4b1bb3958fbb09cf

## About the Role

* Formal training or certification in software engineering concepts and 5+ years of applied experience
 * Hands-on knowledge of end-2-end development in web3 ecosystem - such as smart contract development, deployment, interaction with RPC providers, integrating with key management systems.
 * Strong familiarity with different layers, such as Ethereum, Layer2 protocols
 * Strong object-oriented programming language background in one or more of the following languages: Go, C++, Rust, Java, JavaScript
 * Experience in Developing and Designing large and complex distributed computing environments
 * Proven track record of delivering software development projects
 * Experience with cloud infrastructure services AWS and Kubernetes.
 * Familiarity with using Git or other version control software for source code management, * Financial industry experience
 * Thorough understanding of cryptographic protocols and blockchain implementations
 * Good understanding in key management, custody solutions and cryptographic fundamentals
 * Awareness of inter-operability solutions.
 * Strong analytical and problem-solving skills
 * Self-starter that requires minimal supervision
 * Flexible / adaptable - able to work with diverse groups of people including all levels of business management
 * Excellent project management and facilitation skills

## Description

Be an integral part of an agile team that's constantly pushing the envelope to enhance, build, and deliver top-notch technology products., * Design Peer-to-peer distributed systems and implement using multiple technology stacks.

 * Familiarity with key blockchain technologies & understanding.
 * Collaborate with various line of business technology teams to design and build robust and performant blockchain-based solutions.
 * Design and implement blockchain supporting tools and utilities (e.g., CLI client, tools for exploring the blockchain, monitoring, benchmarking or debugging tools)
 * Implement rigorous and thorough testing practices to ensure the security and performance goals of blockchain infrastructure.
 * Implement rigorous and thorough monitoring and testing practices to ensure the security and performance goals of blockchain infrastructure
 * Design and verify cryptographic protocols deployed on the blockchain
 * Design blockchain solutions, such that it can support benchmark use-cases of decentralized applications, with proven and verified cryptographic protocols
 * Build out monitoring protocols and fail-over measures.
 * Collaborate with development teams to develop integration design and where appropriate prepare estimates on design and development services for integration initiatives