SDK Engineer
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The Sr. SDK Engineer will be responsible for cross-platform development, designing new features & and supporting the client & server teams to ensure Zoom Phone SDK is reliable and stable. They will provide continuous enhancements, and work with both internal & external customers on any issues they may have.
Zoom Phone SDK task design & development (40%)
Design the overall architecture for Zoom Phone tasks and communicate interfaces with server and client teams
This includes detailed control flow at SIP level, specific command requests and responses between client, server, and UI layers
Implement new features and unit test cases according to new feature implementation
Drive tasks across teams and make sure roll out features follow the release plan
Conduct integration testing with server and client teams.
Zoom Phone SDK Stability & Improvements (20%)
Use Windows Performance Analyzer (WPA) or relevant tool, to prevent memory leaks in SDK code
Use Checkmarx (https://www.checkmarx.com) to scan and fix SDK code issues
Use User-Mode Dump Heap (UMDH) to capture and analyze heap memory allocations for a process
Perform sanity testing to prevent crash and regression issues
SDK API auto testing and auto testing tool enhancement (10%)
Perform SDK API auto testing based on an internal tool
Maintain auto testing tools and improve those tools to support more automatic testing scenarios
Troubleshoot customer issues and fix SDK bugs (15%)
Review customer tickets and work with support team, to analyze control flow, SIP flow and determine root cause
Examine client problem report on demand, analyze call details, and perform root cause analysis
Review bugs with the reporter to understand bugs and reproduced steps, then perform root cause analysis and determine a solution
Perform integration testing at the development branch and release branch to ensure the fix has no negative impact
Work on new features requirements (10%)
Work closely with the product management team to define requirements, create user stories and collect use cases on new features
Collaborate with other engineering teams to confirm final design scope and assign task owners
Support client release and analyze client problem reports (5%)
Support client team with fire drill testing before rolling out new releases and check the production crash reports after new release roll-out
Work on enhancements for our automatic client report analysis tool
Track critical and important issues found in client problem reports
Requirements:
Minimum 3 years of work experience
BS degree in CS, EE or its related field
Solid knowledge of C/C++ and object-oriented programing
Good understanding of network communication & Multitask programming & Debugging skills
Familiar with network protocols, like TCP/UDP/TLS/RTP/SRTP/RTCP, etc.
Experience with VoIP technologies and audio quality control
Experience with SIP stacks is preferred (PJSIP , reSIProcate, FreeSWITCH, etc.)
Familiar with at least one IDE tool (e.g. Visual Studio) within one or more platforms(WIN/MAC/IOS/ANDROID)
Support other teams, follow up, and quickly resolve issues
Good teamwork and willingness to help others
Excellent communication skills
Flexibility and ability to work after hours
Preferred Qualifications
Preferences MS degree in a related field
Degree in MIS
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Given Zoom’s status as a federal contractor, we are subject to President Biden’s Executive Order requiring COVID-19 vaccinations for all US employees. As such, Zoom requires all US employees, including remote employees, to be fully vaccinated. Zoom will consider requests for reasonable accommodations for religious or medical reasons as required under applicable law.
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