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:


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.

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.

Job Tags

Contract work

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