Senior Realtime Backend Engineer

Company: Zoom
Location: San Jose
Posted on: April 2, 2026

Job Description:

What you can expect 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. 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 What we’re looking for 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) Ways of Working Our structured hybrid approach is centered around our offices and remote work environments. The work style of each role, Hybrid, Remote, or In-Person is indicated in the job description/posting. 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. Click Learn for more information About Us Zoomies help people stay connected so they can get more done together. We set out to build the best collaboration platform for the enterprise, and today help people communicate better with products like Zoom Contact Center, Zoom Phone, Zoom Events, Zoom Apps, Zoom Rooms, and Zoom Webinars. We’re problem-solvers, working at a fast pace to design solutions with our customers and users in mind. Here, you’ll work across teams to deliver impactful projects that are changing the way people communicate and enjoy opportunities to advance your career in a diverse, inclusive environment. Our Commitment We believe that the unique contributions of all Zoomies is the driver of our success. To make sure that our products and culture continue to incorporate everyone's perspectives and experience we never discriminate on the basis of race, religion, national origin, gender identity or expression, sexual orientation, age, or marital, veteran, or disability status. Zoom is proud to be an equal opportunity workplace and is an affirmative action employer. All your information will be kept confidential according to EEO guidelines. We welcome people of different backgrounds, experiences, abilities and perspectives including qualified applicants with arrest and conviction records and any qualified applicants requiring reasonable accommodations in accordance with the law. If you need any assistance or accommodations due to a medical condition, or if you need assistance accessing our website or completing the application process, please let us know by emailing us at careers@zoom.us. Salary Range or On Target Earnings: Minimum: $124 000,00 Maximum: $271 200,00 In addition to the base salary and/or OTE listed Zoom has a Total Direct Compensation philosophy that takes into consideration; base salary, bonus and equity value. Note: Starting pay will be based on a number of factors and commensurate with qualifications & experience. We also have a location based compensation structure; there may be a different range for candidates in this and other locations At Zoom, we offer a window of at least 5 days for you to apply because we believe in giving you every opportunity. Below is the potential closing date, just in case you want to mark it on your calendar. We look forward to receiving your application! Anticipated Position Close Date: 04/30/26 Ways of Working Our structured hybrid approach is centered around our offices and remote work environments. The work style of each role, Hybrid, Remote, or In-Person is indicated in the job description/posting. 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. Click Learn for more information. About Us Zoomies help people stay connected so they can get more done together. We set out to build the best collaboration platform for the enterprise, and today help people communicate better with products like Zoom Contact Center, Zoom Phone, Zoom Events, Zoom Apps, Zoom Rooms, and Zoom Webinars. We’re problem-solvers, working at a fast pace to design solutions with our customers and users in mind. Find room to grow with opportunities to stretch your skills and advance your career in a collaborative, growth-focused environment. Our Commitment? At Zoom, we believe great work happens when people feel supported and empowered. We’re committed to fair hiring practices that ensure every candidate is evaluated based on skills, experience, and potential. If you require an accommodation during the hiring process, let us know—we’re here to support you at every step. If you need assistance navigating the interview process due to a medical disability, please submit an Accommodations Request Form and someone from our team will reach out soon. This form is solely for applicants who require an accommodation due to a qualifying medical disability. Non-accommodation-related requests, such as application follow-ups or technical issues, will not be addressed.

Keywords: Zoom, Dublin , Senior Realtime Backend Engineer, IT / Software / Systems , San Jose, California