Blockchain Java Backend Developer

Job Description

Blockchain Java Backend Developer

Must Have Technical/Functional Skills

Core Backend Skills

• Strong proficiency in Java (8+), and frameworks such as Spring Boot / Spring Cloud. • Experience building distributed systems and microservices architectures at scale. • Strong knowledge of: • Concurrency, multithreading, asynchronous programming • API design (REST/gRPC), security (OAuth2/JWT), and integration patterns • Solid understanding of data stores: • SQL (PostgreSQL/MySQL) and/or NoSQL (MongoDB/Cassandra) • Caching (Redis) and search (Elasticsearch) is a plus • Hands-on experience with message streaming/queues:

Blockchain Skills (Must-Have)

• Strong understanding of blockchain fundamentals: • Transactions, blocks, confirmations/finality, consensus, gas/fees, wallets, keys. • Experience integrating backend services with blockchain networks/nodes: • Ethereum-compatible networks (Ethereum/Polygon/BSC) using Web3j, ethers-style approaches • and/or permissioned chains (Hyperledger Fabric, Corda, Quorum) • Experience supporting large blockchain deployments: • Node connectivity, RPC management, event indexing, chain reorg handling, retry strategies.

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DevOps / Cloud (Preferred)

• Experience with Docker and Kubernetes for containerized microservices deployments. • CI/CD exposure (Jenkins/GitHub Actions/GitLab CI/Azure DevOps). • Cloud experience (Azure/AWS/GCP) is a plus. • Understanding of security practices: • Secrets management (Vault/KMS), TLS, RBAC, network security.

Roles & Responsibilities

• Design and develop Java-based backend services that interact with blockchain networks and nodes (public or permissioned). • Build and scale microservices-based architecture supporting blockchain transaction workflows, event processing, and off-chain components. • Develop reliable services for: • Transaction orchestration • Smart contract invocation • Blockchain event subscription/listening • On-chain/off-chain data synchronization • Implement scalable APIs (REST/gRPC) for blockchain-enabled products and integrations. • Optimize performance for high throughput and low latency: • Transaction throughput handling, batching, retries, idempotency, rate limiting. • Ensure secure integration with blockchain: • Key management best practices, signing transactions, secure secret handling. • Implement observability and reliability standards: • Logging, monitoring, tracing, alerting, SLOs/SLAs. • Work with DevOps/SRE teams to support production deployments, incident triage, and capacity planning. • Contribute to architecture decisions including: • Event-driven architecture (Kafka/RabbitMQ), caching strategies, database selection, and deployment topologies.

Salary Range- $100,000-$130,000 a year

Qualifications: BACHELOR OF COMPUTER SCIENCE