Senior Software Engineer

What You Can Expect

You will design and build high-performance C++ backend systems powering Zoom's real-time communication platforms including Contact Center and Phone products. Working with distributed telephony infrastructure, you will architect scalability, reliability, and performance for backend services handling millions of concurrent voice sessions globally. Your work will ensure 99.99% uptime and seamless call handling at enterprise scale.

About the Team

We develop backend infrastructure supporting Zoom's real-time voice and contact center services. Our team collaborates closely with product, media, and infrastructure groups to deliver reliable, low-latency communication experiences. We exist to ensure seamless call handling and backend stability at enterprise scale.

Responsibilities

• Architecting and optimizing distributed C++ backend modules that manage large-scale real-time voice traffic with 99.99% reliability across global clusters

• Developing and maintaining SIP-based backend services for call routing, signaling, and media session management while integrating and tuning open-source telephony engines (FreeSWITCH) for backend scalability and protocol compliance

• Building and maintaining backend frameworks for session management, load balancing, and distributed state synchronization using Redis or similar technologies

• Troubleshooting complex backend issues such as memory leaks, thread contention, and network latency while supporting production operations and ensuring high availability

• Collaborating with cross-functional teams to deliver new backend features and improve system performance across devices and networks

What We're Looking For

• Demonstrate 5+ years of professional C/C++ development experience or equivalent practical experience in systems programming

• Apply strong understanding of backend architecture, distributed systems, and real-time communication services

• Use deep knowledge of VoIP protocols such as SIP, RTP/RTCP, and related telephony technologies in production environments

• Demonstrate proficiency in Linux systems programming including IPC, socket programming, and asynchronous I/O

• Apply experience using Redis or similar technologies for distributed caching and state management

• Communicate effectively in Mandarin to collaborate with distributed engineering teams across regions

• Contribute hands-on experience with FreeSWITCH, Asterisk, or similar telephony engines and familiarity with Lua scripting or embedded logic engines for backend service logic

• Demonstrate experience with performance tuning, scalability optimization, backend observability tools, and exposure to cloud-native environments and container orchestration (Kubernetes, Docker)

Salary Range or On Target Earnings:

Minimum:

Maximum:

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!

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.

Information about Zoom’s benefits is on our careers page here. 

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.

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.

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.

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