Full-Stack Java Engineer – Scalable APIs & UI

Callsign is seeking a Full Stack Software Engineer to design, build, and maintain end-to-end features spanning high-throughput Java backend services and modern web interfaces. You will take ownership of features from architectural design through implementation, testing, deployment, and operational monitoring.

You will collaborate with Product, UX/UI Designers, QA and platform teams to translate user requirements into technical solutions; write clean, testable code across the full stack and

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