Java Lead Developer

Global Business Ser. 4u; New York (NY); On-site; USD 124,000 - 193,000; Full time

Job summary

Global Business Ser. 4u in New York, NY is seeking a Lead Java Developer (Contractor) to drive hands-on technical leadership for high‑performance backend systems. The role is onsite in New York with a 3‑day weekly presence and requires local to NY or NJ.

You will mentor engineers, shape project architecture, and implement modern Java features, Spring Boot, reactive programming, and robust error handling. Prior experience with Java 17/21 and modern Java streams is expected to guide the team and

Qualifications

• Local to NY or NJ
• Contractor role onsite 3 days per week
• Duration 12+ months

Responsibilities

• Lead backend Java development and ensure performance
• Guide and mentor the engineering team on best practices
• Define architecture for scalable backend solutions

Skills

Java backend

Leadership

High-performance systems

Mentoring

Tools

Spring Boot

Reactive programming

Java Streams

Java 17/21

Job description

Job Title: Lead Java Developer (Contractor)

Location: New York, NY (Onsite – 3 Days per Week)

Candidate Requirement: Local to NY or NJ

Duration: 12+ Month

This is a hands‑on technical leadership role, suited for someone with a deep understanding of high‑performance backend systems and team guidance.

• Diff between spring 2.x and 3.x versions
• Mono and Flux in Springboot reactive.
• Programming on springrestful example and java streams
• Java 17 and 21 features
• Exceptions in spring boot
• Sealed interface and functional interface
• Springboot restful and project architecture.