Blockchain Java Backend Developer

Location: New York City, NYSalary: $120,000.00 USD Annually - $130,000.00 USD AnnuallyDescription: 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: o Concurrency, multithreading, asynchronous programmingo API design (REST/gRPC), security (OAuth2/JWT), and integration patternsSolid understanding of data stores: o SQL (PostgreSQL/MySQL) and/or NoSQL (MongoDB/Cassandra)o Caching (Redis) and search (Elasticsearch) is a plusHands-on experience with message streaming/queues: Blockchain Skills (Must-Have):Strong understanding of blockchain fundamentals: o Transactions, blocks, confirmations/finality, consensus, gas/fees, wallets, keys.Experience integrating backend services with blockchain networks/nodes: o Ethereum-compatible networks (Ethereum/Polygon/BSC) using Web3j, ethers-style approacheso and/or permissioned chains (Hyperledger Fabric, Corda, Quorum)Experience supporting large blockchain deployments: o Node connectivity, RPC management, event indexing, chain reorg handling, retry strategies.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/Google Cloud Platform) is a plus.Understanding of security practices: o Secrets management (Vault/KMS), TLS, RBAC, network security.Roles & ResponsibilitiesDesign 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: o Transaction orchestrationo Smart contract invocationo Blockchain event subscription/listeningo On-chain/off-chain data synchronizationImplement scalable APIs (REST/gRPC) for blockchain-enabled products and integrations.Optimize performance for high throughput and low latency: o Transaction throughput handling, batching, retries, idempotency, rate limiting.Ensure secure integration with blockchain: o Key management best practices, signing transactions, secure secret handling.Implement observability and reliability standards: o 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: o Event-driven architecture (Kafka/RabbitMQ), caching strategies, database selection, and deployment topologies.By providing your phone number, you consent to: (1) receive automated text messages and calls from the Judge Group, Inc. and its affiliates (collectively "Judge") to such phone number regarding job opportunities, your job application, and for other related purposes. Message & data rates apply and message frequency may vary. Consistent with Judge's Privacy Policy, information obtained from your consent will not be shared with third parties for marketing/promotional purposes. Reply STOP to opt out of receiving telephone calls and text messages from Judge and HELP for help.Contact:This job and many more are available through The Judge Group. Please apply with us today!