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Freelance Java Backend Developer Jobs in New York

GainAm

Java backend developer job

Hicksville, NY · On-site

$110K/yr

Required Skills Core Java, Spring, Java Web-service, RestFul API, Spring boot Required Experience We are looking for backend Java engineers with at least 3+ years experience in writing backend ...

BC Forward

Java Backend Developer

Newark, NJ

$65.05/hr

... backend services in a collaborative Agile environment. Responsibilities: Design, develop, and ... Core Java skills. Solid understanding of object-oriented programming principles. Hands-on ...

FreshDirect

Sr. Java Backend Developer

Woodbridge, NJ · On-site

$130K - $155K/yr

What You'll Do As a Senior Backend Developer (Java) , you'll help design, develop, and scale backend systems that power FreshDirect's e-commerce and logistics platforms. You'll collaborate with cross ...

FreshDirect

Sr. Java Backend Developer

Woodbridge, NJ · On-site

$130K - $155K/yr

What You'll Do As a Senior Backend Developer (Java) , you'll help design, develop, and scale backend systems that power FreshDirect's e-commerce and logistics platforms. You'll collaborate with cross ...

CrackaJack Digital Solutions LLC

Java Developer

New York, NY · On-site

$55.75 - $72.25/hr

Java Backend Engineer Experience: 8+ Years Employment Type: Contract Location: NY We are seeking an experienced Java Backend Engineer with strong expertise in building scalable, high-performance ...

TriOptus LLC

App Dev - Java - Sr

Passaic, NJ · On-site

$59.25 - $75.50/hr

Java Backend Developer Java Backend Developer/Microservices/Kafka/Springboot Collaborate with and across Agile teams to design, develop, test, implement, and support technical solutions in full-stack ...

Infosys

Java Backend Developer

Jersey City, NJ · On-site

$55.25 - $71.75/hr

Required : • Experience in software development using Java, Spring Boot • Experience in Java 8, ... Devops Company : Infosys is a technology company that offers consulting, outsourcing, cloud ...

Grinteq

Java Liferay Developer

Manhattan, NY · On-site

$56.25 - $72.75/hr

Position We are looking for an Experienced Java Back-End Developer to join our team. Responsibilities and duties * Quickly gain an up-to-date and comprehensive understanding of the code base and ...

Kasmo Global

Java Developer

South Plainfield, NJ · On-site

$53.25 - $69/hr

Top 3 Must Haves: 1. Core Java 2. Any one DB 3. Micro Services, Spring and Spring Boot Job Summary: • Lead Java Backend engineer with good hands on experience (8 to 10+ years) in Java • Core Java ...

Esprow

Senior/Lead Java Back-End Developer

Manhattan, NY · On-site +1

Position Summary We are looking for a talented Java back-end senior or lead developer with extensive expertise working on web application back-ends using the Spring Framework. You will be responsible ...

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Blockchain Java Backend Developer

Blockchain Java Backend Developer

Tata Consultancy Services

Jersey City, NJ • On-site

$55.25 - $71.75/hr

Full-time

This job post has expired 1 day ago. Applications are no longer accepted.

Tata Consultancy Services rating

6.5

Company rating: 6.5 out of 10

Based on 21 frontline employees who took The Breakroom Quiz

154th of 204 rated it services

Job description

Job Summary:
Tata Consultancy Services is seeking a Blockchain Java Backend Developer to design and develop backend services that interact with blockchain networks. The role involves building scalable microservices architecture and optimizing performance for blockchain transaction workflows.
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.
Qualifications:
Required:
• BACHELOR OF COMPUTER SCIENCE
• 4 - 6 Years of experience
• 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.
• Strong knowledge of API design (REST/gRPC), security (OAuth2/JWT), and integration patterns.
• Solid understanding of SQL (PostgreSQL/MySQL) and/or NoSQL (MongoDB/Cassandra).
• Hands-on experience with message streaming/queues.
• 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.
• 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.
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.
Company:
Tata Consultancy Services is a business solutions company that specializes on information technology services and consulting. It is a sub-organization of Tata Group. Founded in 1968, the company is headquartered in Mumbai, IND, with a team of 10001+ employees. The company is currently Late Stage.

What Tata Consultancy Services employees say

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Hours and flexibility

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About Tata Consultancy Services

Sourced by ZipRecruiter

Tata Consultancy Services is an IT services, consulting and business solutions organization that delivers real results to global business, ensuring a level of certainty no other firm can match. TCS offers a consulting-led, integrated portfolio of IT, BPO, infrastructure, engineering, and assurance services. This is delivered through its unique Global Network Delivery Model™, recognized as the benchmark of excellence in software development. TCS delivers a level of certainty that no other firm can match--to our clients and to our employees. Come join us and experience certainty in your career. TCS a global Consulting and IT Services firm that is ranked in the top quartile by industry analysts. Our 2021 fiscal revenues topped $25 B and our market capitalization is over $170+B, yet we have a deep and large history of philanthropy and corporate social responsibility. Now approaching 600K of the best IT professionals and consultants, we are a trusted advisor, guiding our clients' enterprises through growth and transformation journeys - helping them to become agile, intelligent, automated and on the cloud. We are devoted to DEI and are recognized as a top employer and place to work.

Industry

It services

Company size

10,000+ Employees

Headquarters location

Edison, NJ, US

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