Job Description

Description Key Responsibilities : Design, develop, and maintain scalable backend services and APIs using Java. Integrate and interact with blockchain APIs / SDKs such as Web3.js, Ethers.js, Web3.py, or Hyperledger Fabric SDK. Work with smart contracts, handle event-driven logic, and manage blockchain transaction lifecycles. Implement and maintain secure cryptographic mechanisms including ECDSA, SHA-256, and AES for data protection and key management. Design and optimize database schemas and queries using PostgreSQL, MongoDB, Redis, or MySQL. Develop microservices and handle asynchronous processing using Kafka or RabbitMQ. Containerize and deploy services using Docker and Kubernetes in AWS, Azure, or GCP environments. Collaborate with frontend, blockchain, and DevOps teams to deliver end-to-end platform functionality. Ensure system security, scalability, and fault tolerance across distributed systems. Write clean, maintainable, and testable code following best practices and peer review processes. Required Skills & Experience 3 to 6 years of professional experience in backend development with Node.js, Java, Go, or Python. Proven experience integrating with blockchain APIs/SDKs (Web3.js, Ethers.js, Web3.py, Hyperledger Fabric, etc.) Solid understanding of smart contracts, events, and transaction processing on blockchain networks. Familiarity with cryptographic algorithms and key management standards (ECDSA, SHA-256, AES). Strong knowledge of relational and NoSQL databases PostgreSQL, MongoDB, Redis, or MySQL. Experience with microservices architecture, message queues (Kafka, RabbitMQ), and asynchronous systems. Hands-on experience with Docker, Kubernetes, and cloud platforms (AWS / Azure / GCP). Preferred / Good-to-Have Experience developing or integrating smart contracts using Solidity. Exposure to DeFi, NFT, or tokenized asset ecosystems. Understanding of decentralized identity (DID), zero-knowledge proofs, or related blockchain privacy concepts (ref:hirist.tech)