Senior Java Developer – Boot, Microservices & Multithreading; W2

Experience : 5-15

Job Type :
Contractual

Location :
Englewood Cliffs, NJ

Location: Englewood Cliffs, NJ
Duration: Long-Term, Ongoing Contract
Experience: 8+ Years
Position Type: Contract
Work Arrangement:Hybrid - 3 days a week onsite

We are seeking a highly skilled Senior Java Developer to join the engineering team of a leading media and technology organization.

The ideal candidate will have deep expertise in Core Java, Spring Boot, microservices architecture, multithreading, and high-performance backend application development
.

This role involves designing, developing, and optimizing scalable, reliable, and high-throughput backend services supporting complex, data-intensive enterprise applications.

We are looking for a technically strong, hands‑on engineer who understands Java internals, concurrent programming, distributed systems, and production‑level performance optimization.

Design, develop, and maintain high-performance backend applications using Java and Spring Boot.

Build scalable, resilient microservices and RESTful APIs.

Develop and optimize multithreaded and concurrent Java applications.

Implement efficient asynchronous processing and parallel execution mechanisms.

Design backend services capable of processing large volumes of data with low latency and high throughput.

Apply distributed systems principles to ensure application scalability, reliability, and fault tolerance.

Optimize application performance, memory utilization, JVM behavior, and database interactions.

Troubleshoot complex production issues involving concurrency, thread contention, memory leaks, and performance bottlenecks.

Collaborate with architects, engineering teams, and business stakeholders to translate requirements into robust technical solutions.

Participate in architecture discussions, technical design reviews, and code reviews.

Write clean, maintainable, well‑tested production‑quality code.

8+ years of professional Java development experience.

Strong hands‑on experience with Java 11/17/21 or newer.

Excellent understanding of Java collections, generics, streams, and functional programming.

Deep knowledge of multithreading, concurrency, synchronization, thread safety.

Experience with Executor Service, Completable Future, thread pools, concurrent collections, and asynchronous programming.

Strong understanding of JVM internals, garbage collection, memory management, and performance tuning.

Spring Boot & Microservices

Extensive hands‑on experience with Spring Boot and the Spring ecosystem.

Proven experience designing and developing microservices‑based applications.

Strong knowledge of REST APIs, service‑to‑service communication, and API design.

Understanding of distributed transactions, resilience patterns, circuit breakers, retries, and fault tolerance.

Experience building scalable, highly available backend services.

Performance & Distributed Systems

Experience developing high‑throughput, low‑latency applications.

Strong understanding of concurrent processing, asynchronous workflows, and event‑driven architectures.

Ability to identify and resolve performance bottlenecks.

Experience with distributed caching, messaging and data processing systems.

Strong debugging, profiling, and production troubleshooting skills.

Databases & Development Tools

Strong SQL skills and experience with relational databases such as PostgreSQL, Oracle, or MySQL.

Experience with database query optimization and performance tuning.

Proficiency with Git, Maven/Gradle, and automated testing frameworks.

Experience with CI/CD pipelines and modern software engineering practices.