Blockchain Java Backend Engineer

Tata Consultancy Services•New York, NY

fulltime

Engineering and Information Technology

2+ years

Job Description 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 to $130,000 per year

Qualifications: BACHELOR OF COMPUTER SCIENCE