Engineer

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:

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- $90,000-$100,000 a year

Location

Jersey City, NJ

Job Function

TECHNOLOGY

Role

Engineer

Job Id

420118

Desired Skills

Java

Salary Range

$90,000-$100,000 a year

Desired Candidate Profile

Qualifications : BACHELOR OF COMPUTER SCIENCE