Engineer

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 o API design (REST/gRPC), security (OAuth2/JWT), and integration patterns

Solid understanding of data stores

• o 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 o and/or permissioned chains (Hyperledger Fabric, Corda, Quorum)

Experience supporting large blockchain deployments

• 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/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- $90,000-$100,000 a year </div

Qualifications

BACHELOR OF COMPUTER SCIENCE