Senior Realtime Backend Engineer

Zoom•San Jose, CA

8d•Hybrid

About The Position

You will architect high-performance C++ backend systems powering Zoom's AI-driven Contact Center platform. Working with distributed telephony infrastructure and real-time voice services, you will optimize session management and media handling at global scale. Your work will directly impact millions of customer interactions with 99.99% reliability. About the Team We deliver cloud telephony infrastructure for Zoom's omnichannel Contact Center platform. Our team collaborates across engineering, product, and operations to build high-concurrency voice services. We exist to power seamless, AI-enhanced customer experiences at enterprise scale.

Requirements

Communicate fluently in Mandarin to collaborate with distributed engineering teams across regions
Demonstrate 5+ years of professional C/C++ development experience or equivalent practical experience in systems programming
Master Linux systems programming including IPC, socket programming, I/O multiplexing (epoll), and asynchronous I/O
Use Redis for distributed locking, caching, and state management in high-concurrency production environments
Apply familiarity with Lua scripting or embedded logic engines for telephony applications
Demonstrate experience with audio quality control strategies or AI/ML integration for voice services (ASR/TTS/NLP)

Responsibilities

Designing and optimizing distributed C++ backend modules that ensure 99.99% reliability and massive scalability for real-time voice traffic
Building low-latency synchronization mechanisms using Redis and distributed technologies to manage real-time call states with cross-functional engineering teams
Troubleshooting complex system bottlenecks including memory leaks, thread contention, and network latency to maintain high-concurrency performance
Collaborating with logic and product teams to optimize the C++/Lua bridge and deliver business features with minimal overhead
Learning and applying telephony concepts (SIP, RTP, media handling) as needed to support voice service optimization

Benefits

As part of our award-winning workplace culture and commitment to delivering happiness, our benefits program offers a variety of perks, benefits, and options to help employees maintain their physical, mental, emotional, and financial health; support work-life balance; and contribute to their community in meaningful ways.

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