Blockchain Developer/Architect
Purple Hires
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Job Details
Skills
- Blockchain
Summary
Key Responsibilities
- Design, develop, and deploy Web3 components and integrations for Citi''s Digital Asset Platform, including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connectors
- Build and maintain backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Corda, or equivalent)
- Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency
- Integrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend services
- Implement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronization
- Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure
- Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards
- Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components
- Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes
- Stay current with the rapidly evolving Web3 ecosystem — tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use cases
- Work within Agile/Scrum frameworks, participating in sprint planning, stand-ups, and retrospectives within a distributed global team
- Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines
Qualifications / Experience
- Bachelor''s degree in Computer Science, Engineering, or a related discipline; MS is a plus
- 8+ years of overall software engineering experience, with a strong backend development foundation
- 2 to 4 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration
- 3 to 5 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks
- Proficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practices
- Hands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem
- Solid understanding of blockchain fundamentals — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management
- Experience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization patterns
- Familiarity with permissioned blockchain networks (Hyperledger Besu, Fabric, Corda, or R3) is a strong plus
- Experience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent)
- Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipelines
- Understanding of cryptographic concepts — digital signatures, hashing, PKI, and secure key management — as applied to blockchain systems
- Exposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plus
- Experience in financial services or regulated industries is a plus
- Familiarity with Agile/Scrum methodologies and distributed team collaboration tools
- Dice Id: 91170791
- Position Id: 9030348
- Posted 1 day ago
Company Info
About Purple Hires
At Purple Hires, we are dedicated to consistently delivering an outstanding recruitment experience that benefits both our clients and candidates.
We are committed to excellence in every aspect of our recruitment process. From understanding client requirements to sourcing, screening, and presenting the most suitable candidates, we maintain high standards and a results-driven approach. Our goal is not just to fill positions but to add genuine value to our clients’ teams by finding the right talent.
Honesty and openness are at the heart of our recruitment practices. We believe that clear, consistent communication fosters trust and reliability. Whether discussing job requirements, candidate expectations, or process timelines, we ensure that all parties remain well-informed and engaged. Transparency is key to building long-term relationships and ensuring mutual satisfaction.
Respect for both clients and candidates underpins our entire approach. We treat every individual with dignity and professionalism, recognizing that a positive experience leaves a lasting impact. From initial engagement to final placement, we handle each interaction with empathy and consideration, promoting a respectful and inclusive environment.
By combining performance, transparency, and respect, we create a seamless, rewarding recruitment experience. Clients can rely on us for consistent quality and integrity, while candidates feel valued and supported throughout their journey. This holistic approach allows us to build sustainable relationships and maintain a reputation as a trusted recruitment partner.
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