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Blockchain Java Backend Engineer
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 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)
o Caching (Redis) and search (Elasticsearch) is a plus
- Hands-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 approaches
o 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.
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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:
o 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:
o Transaction orchestration
o Smart contract invocation
o Blockchain event subscription/listening
o 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:
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.
Salary Range: $100,000 to $130,000 per year
Location
New York, NY
Job Function
TECHNOLOGY
Role
Engineer
Job Id
399448
Desired Skills
Java
Salary Range
$100,000-$130,000 a year
Desired Candidate Profile
Qualifications : BACHELOR OF COMPUTER SCIENCE
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