Blockchain Java Backend Developer

DTEL Engineering & Consultants Inc
yesterday

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English

Job location

Tech stack

Java
Amazon Web Services (AWS)
Azure
Cloud Computing
Continuous Integration
Data Stores
Data Synchronization
DevOps
Distributed Systems
Elasticsearch
Github
Key Management
Network Security
PostgreSQL
MongoDB
MySQL
Node.js
NoSQL
OAuth
Quorum
Role-Based Access Control
Redis
Blockchain
Software Deployment
SQL Databases
Data Logging
Multithreading
Transport Layer Security
Google Cloud Platform
Spring Cloud
Concurrency
Spring-boot
Caching
Indexer
Backend
Hyperledger
Gitlab-ci
Low Latency
Cassandra
Enterprise Integration
Ethereum
Asynchronous Programming
Api Design
Docker
Jenkins
Microservices

Job description

  • 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

Requirements

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/Google Cloud Platform) is a plus.
  • Understanding of security practices:

o Secrets management (Vault/KMS), TLS, RBAC, network security.

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