Senior Java Backend Engineer: Modernize & Integrate Systems

Quinnox is seeking a Senior Software Engineer to design, build, and modernize our core backend systems in New York. You will own technical delivery of critical services from architecture through production deployment, writing high-performance Java and Spring code, and ensuring resilience in a distributed environment.

The role emphasizes transforming legacy codebases, integrating with enterprise vendor platforms, and maintaining strong code quality through reviews and testing, while delivering