Job Description

Salary: $120,000 - 130,000 per year Requirements:

• Strong expertise in Java (version 8 or higher) and frameworks like Spring Boot and Spring Cloud.
• Experience in designing distributed systems and microservices architectures at scale.
• Solid understanding of concurrency, multithreading, and asynchronous programming.
• Proficient in API design (REST/gRPC), and security (OAuth2/JWT) integration patterns.
• Good grasp of SQL (PostgreSQL/MySQL) and/or NoSQL (MongoDB/Cassandra).
• Familiarity with caching (Redis) and search technologies (Elasticsearch) is advantageous.
• Extensive experience with message streaming and queues.
• In-depth knowledge of blockchain principles: transactions, blocks, confirmations/finality, consensus mechanisms, gas/fees, wallets, and keys.
• Proven background in connecting backend services with blockchain networks/nodes, particularly Ethereum-compatible (Ethereum/Polygon/BSC) using Web3j or similar.
• Experience with permissioned blockchains (Hyperledger Fabric, Corda, Quorum) is a plus.
• Background in managing extensive blockchain deployments, focusing on node connectivity and RPC management.
• Familiarity with Docker and Kubernetes for deploying containerized microservices (preferred).
• Exposure to CI/CD tools such as Jenkins, GitHub Actions, GitLab CI, or Azure DevOps is preferred.
• Cloud experience with platforms like Azure, AWS, or Google Cloud is beneficial.
• Understanding of security practices, including secrets management (Vault/KMS) and network security protocols.

• Design and develop backend services in Java that interact with various blockchain networks and nodes, whether public or permissioned.
• Construct and scale a microservices-based architecture that supports blockchain transaction workflows and event processing.
• Develop reliable services for transaction orchestration, smart contract execution, blockchain event listening, and data synchronization between on-chain and off-chain systems.
• Create scalable APIs (REST/gRPC) tailored for blockchain-integrated products and services.
• Enhance performance to accommodate high throughput and minimize latency, focusing on transaction handling, batching, retry strategies, and rate limiting.
• Ensure secure interactions with blockchain systems through best practices in key management, transaction signing, and secret handling.
• Implement observability and reliability standards that include logging, monitoring, and alerting frameworks along with service level objectives (SLOs) and service level agreements (SLAs).
• Collaborate with DevOps and SRE teams to facilitate production deployments, handle incident responses, and assist in capacity planning.
• Contribute to architectural discussions, including considerations for event-driven architectures, caching methodologies, database selection, and deployment strategies.

• API
• AWS
• Azure
• Backend
• Blockchain
• CI/CD
• Cloud
• Cassandra
• DevOps
• Docker
• ElasticSearch
• Ethereum
• Fabric
• GitHub
• GitLab
• JWT
• Java
• Jenkins
• Kubernetes
• MongoDB
• MySQL
• Network
• NoSQL
• PostgreSQL
• REST
• Redis
• SQL
• Security
• Spring
• Spring Boot
• gRPC
• microservices
• NodeJS
• Support
• Kafka
• Marketing
• RBAC
• RabbitMQ

More:

We are a dynamic company based in New York City, offering a competitive salary range of $120,000 to $130,000 annually. Our team is focused on innovative blockchain solutions, and we prioritize a collaborative work environment that thrives on cutting-edge technology. We offer excellent benefits and opportunities for professional growth, welcoming talented individuals who are passionate about their craft to join us on this exciting journey.

last updated 15 week of 2026

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