Senior Java Engineer - Scalable Backend & Performance

Barclays; Whippany (NJ); On-site; USD 189,592 - 195,000; Full time

Benefits offered by this job

Medical coverage

Dental coverage

Vision coverage

401(k) plan

Life insurance

Job summary

Barclays in Whippany, NJ designs and maintains Java-based enterprise applications across the full software lifecycle, delivering scalable, high‑performance systems through modern back-end architectures. This role emphasizes multithreading, caching, and robust testing to ensure production quality.

You will collaborate with product teams and IT peers to implement APIs, libraries, and backend components, participate in code reviews, and uphold secure coding practices while driving continuous

Qualifications

• Design, develop, maintain Java-based applications across the full SDLC.
• Integrate backend components, APIs, and libraries for critical processing.
• Focus on performance, scalability, reliability, and optimization with multithreading and caching.
• Review platform architecture to improve performance and reduce technical debt.
• Provide technical support, troubleshoot issues, and verify deliverables during deployment.
• Collaborate with IT teams and business users to support enhancements and integration.
• Ensure code quality through unit and integration testing and secure coding practices.

Responsibilities

• Development and delivery of high-quality software using standard languages, frameworks, and tools.
• Define requirements with product managers and engineers to align with business objectives.
• Participate in code reviews and promote a culture of code quality and knowledge sharing.
• Stay informed of industry trends and contribute to technology communities.
• Adhere to secure coding practices and implement effective unit testing.
• Collaborate across functions to ensure smooth integration and deployment.

Skills

Java programming

Multithreading

Performance optimization

REST APIs

Unit and integration testing

Tools

Spring Framework

JDBC

Git

Job description

Barclays in Whippany, NJ designs and maintains Java-based enterprise applications across the full software lifecycle, delivering scalable, high‑performance systems through modern back-end architectures. This role emphasizes multithreading, caching, and robust testing to ensure production quality.

You will collaborate with product teams and IT peers to implement APIs, libraries, and backend components, participate in code reviews, and uphold secure coding practices while driving continuous