Senior Streaming Engineer with RTP/RTSP Expertise

Zheng (Jane)Wang

Phone: 408-***-****

Email: HYPERLINK "mailto:******@*****.***" ******@*****.***

San Jose, CA

CAREER OBJECTIVE

An experienced professional, with progressive experience in performance, testing, development, design, support, full product development cycle, looking to expand my career in the area of media/GPU/performance/connectivities/networking/AI, as well as OS frameworks and applications.

CAREER PROFILE

10+ years progressive experience broad knowledge covering Application, OS, media, GPU, wireless access and core networks. Strong end to end iOS/watchOS/tvOS/macOS, application integration, testing, extensive performance tool development and analysis experience, in GPU/multimedia/adaptive streaming video, realtime communications, audio/ AV sysnc/wireless data/connectivity/QoS area.

Rich experience in proto type andend to end performance improvement proposals, in development, design, support cycle of embedded devices.

• Solid experience in connectivities, protocols, applications, streaming video, GPU, display pipeline, as well as embedded devices OS, ie, Linux, Windows Mobile, Palm Web OS, BlackBerry, iOS/watchOS/tvOS/.

• Familiarity with a wide range of current media compression standards such as HEVC, HEIF, H264, JPEG.

• Deep understanding the user experience of mobile audio and video/data/multimedia applications, from performance of networking/application/OS level.

• Always able to translate new technologies, new features/requirements into solutions, design effective test infrastructure, test plan, test cases, design automation tools, applications, to ensure the successful delivery of the new products, features with good user experience and performance.

Software: C, C++, Object C, Python.

OS Platforms: iOS, macOS, tvOS, watchOS, Linux.

CAREER HIGHLIGHTS

Personal Leave & Technical Refresh 2024 – Present Took time to support family needs while continuing professional development. Maintained technical proficiency and upskill AI technologies and related coding/testing. Interactive Media Group, Apple Inc, Cupertino, CA – 2010~ 2024 Sr. Engineer

Design test plan, test infrastructure, as well as development tools and apps, to qualify the functionalities, APIs, as well as measure the performance in video/live photos playback/ encoding/export/editing/GPU/display rendering pipeline cross all Apple OSs, in the level of applications, AVFoundation, CoreMedia, and Graphic Areas include playback pipeline API validation, end to end video and audio/photos playback/export/editing quality, memory usage, memory leaks, latency, frame rate and battery performance. Ensure high quality delivery of audio/video playback, realtime communications, game kit, games, display features on iOS/tvOS/watchOS/macOS/HomePod platform. Work with cross-functional teams on triaging of video playback pipeline, music playback pipeline, mediaserverd memory usage, fragments, leaks, drop frames, realtime communications QoS, and power performance issues.

Design test plan, test infrastructure, as well as development automation tools in the initial launch of FaceTime iOS over WiFi/cellular, FaceTime on macOS. Develop tools for qualify video quality, connectivity, network features, protocols. Develop tool to simulate network condition, and measure FaceTime video performance, ie, latency, jitter, throughput, FaceTime and Game Kit connectivity, as well as battery, memory usage, leaks, cpu usage, frame rate of FaceTime application.

Work with cross-functional teams on triaging of FaceTime video/audio quality, including FaceTime video/audio over cellular and WiFi features, as well as performance issues. Work with cross function, design core media API unit test and code coverage software from Xcode.

Work in SWE performance tentpole team(tiger team), on analytical and simulate applications and frameworks cross Apple OSs, in the area of speed, memory and power. Develop software to analysis and classify OS platform performance behavior and bottlenecks. Work with various engineering teams to in deep dive performance problems, to ensure the smoothes and effectiveness of the performance of Apple applications and OS frameworks, from UI to OS level.

Projects high light:

I design test plan, test case, and build test infrastructure, as well as writing tools, test app, ensure the successful launch of the following projects for Apple:

• Work cross SWE OS framework teams, drive performance improvement, by carry and develop streamlined end to end OS/applications automation, big data analysis, as well and virtualization tools. Wrote automation pipeline test on the combination of Apple automation test platform, CI/CD systems, splunk, mongoDB, and deploy performance telemetry solution via Docker & Kubernetes and AWS.

• Drive and propose end to end performance improvement, by working with multiple develop parties.

• Develop unit test for graphic GPU/metal/openGL/CL frameworks and display rendering pipeline

• Design Unit test for media systems frame work and develop code coverage tool.

• Initial launch HEVC, HEIF, HDR cross Apple OSs

• Home Pod playback music API

• Performance improvement for multi-video playback on iOS

• WatchOS performance optimization

• Initial FaceTime video/audio over WiFi and cellular launch on iOS/macOS, Game Kit, and received outstanding contribution award, since I design effective test infrastructure, test plan, test cases, carried test and developed tools, effectively drove successful FaceTime initial launch on iOS/macOS over Wifi and cellular. Senior Engineer (Contract) - 2010

Qualcomm Internet Service Division, Santa Clara, CA Develop Test plan, Test case design for Qualcomm gps One position-location solutions, based on GPS specifications in different wireless GSM/CDMA/WCDMA/LTE/WiFi standards, Qualcomm design specification, and function requirements. Implement, Execute and automate Test cases in Solaris, Linux and Windows environment. Engage in system trouble-shooting, problem reporting, and tracking. Work with cross functional teams like deployment, commercialization, development, product management and provide support.

Plan, configure & maintain System test environment and work with IT as required to resolve any network/hardware/software issues.

Senior System Integration engineer 2008 – 2009

MobiTV Emeryville, CA

Perform end to end integration of MobiTV steaming video application/3GPP RTSP/RTP stack on multiple mobile device OS/firmware platforms, streaming servers, in EDGE/UMTS/1XRTT/ EVDO environment. Ensure the best user experience of MobiTV applications from deep level. Plan and setup testing environment in wireless/multimedia/networking area, to simulate/ execute different test cases, in different wireless/networking/QoS/media encoding ( MPEG4, H264…etc) scenarios, on different mobile device platforms, ie,Linux,Windows Mobile, Palm Web OS, BlackBerry, iOS.

Write test plan/test cases of white box and black box testing, to ensure MobiTV application meeting the standard of 3GPP, 3GPP2, as well as best user experience of wide range consumers

Execute test cases and give the feedback to application/ protocol stack/streaming server development and 3rd party handset OEMs.

Develop traffic shaping tools, perform streaming video quality investigate, based on the analysis of the factors from cellular/WiFi network, IP network, streaming servers, packet captures, log captures, and message flows. As well as carry end to end QoS optimization, analysis. Provide feedback and fix proposal for both MobiTV and wireless carriers. Senior VOIP Telephony SDTE 2007

LiveOps Inc. Palo Alto, CA

Performed software quality, system, telecom white box testing on Liveops VOIP call center platform. Developed comprehensive test strategies, plans, scenarios and documented results & reports by using VOIP test tools. Developed scripts in Javascript and Perl. Wrote documentation using Javadoc.

Worked with product development engineers to coordinate bug fixes and testing. Subject Matter Expert -UMA & IPAccess 2006 contract, T-mobile, Concord, CA Lead analysis of UMA 3GPP and implemented in the T-mobile UMA architecture. Specified key parameters in cellular network and WiFi handset to achieve smooth handoff and roaming of WiFi (802.11b) interworking with GSM/GPRS. Gave feedback to both vendors and headquarter

Lead capacity planning, performance monitoring, and troubleshooting of GSM/GPRS/EDGE IPAccess radio access network.

Generated traffic report by SQL, performed network configuration and system upgrade for the IPAccess. Lead T-Mobile West USA Region in launching UMA trial. Lead IPAccess in planning, testing, performance optimization and trouble shooting Sr. integration Engineer 2004 ~ 2006

Alvarion Inc., Mountain View, CA

Lead development of comprehensive test tools for both CDMA (CDMA2000) base station, core network including soft switch, media gateway and value added services, such as VMS, SMS, pre-paid...ect.

Verified the system according to call processing, IS-41 protocol, SS7, CDMA standard, 3GPP2 standard, VOIP protocol such as: MGCP, SIP, RTP. Provided technical support and first line diagnostics for the customers. Developed software and tools and automate regression, load testing. Provided proposal to design department and upper level management.

3G Data Engineer 2003~ 2004

Verizon Wireless

Lead 3G wireless data network KPI definition analysis, message flow, data backbone, QoS optimization, design and troubleshooting for the region. Lead system architecture, 3G data troubleshooting, performance tool implementation and proposals to vendors.

Participated in vendor evaluation for 3G data network elements (PCF, PDSN,AAA, IMS).Co- ordinated with New Technology Development Team for wireless data devices (Blackberry, AirCard), and new technology development for Mobile IP, VOIP, web service over cellular network.

Graduate Candidate (MSEE)

University of Ottawa, Ottawa, Canada

Received an academic scholarship from graduate school. Worked in the Broadband Wireless and Internetworking Lab. Major research areas including Mobile IP, MPLS, QoS, 802.11b WLAN network and mobile multimedia application related areas (SMIL, MPEG4…etc. Worked on WLAN, GPRS, and 3G interworking and WLAN security projects. Sr. UMTS Wireless Software & System Design Engineer Nortel Networks, Ottawa Canada 1999 ~ 2001

Specified UMTS wireless system architecture, call processing messaging flow, protocol stack model, investigated 3GPP standard and UMTS wireless interface (Iub, Iur, Iu) design specification for Nortel Networks UMTS product.

Lead designer for development of software (such as Radio Resource Management, NBAP, RNAP, fault tolerance, AAL2, call processing, sparing), on Nortel ATM PP15K and PP 7K platform for UMTS user plane and control plane, developed real time embedded software using UML object orient analysis method, Rational-Rose real time design tool, C/C++ language, Vxworks real time OS, as well as ClearCase version control. Lead RNC software integration and verification by using UMTS protocol simulation tool Catapult

Participated in the UMTS wireless system integration and verification, RNC, Node B system support. IP routing and ATM PNNI routing design for Nortel UMTS-CDMA packet switch platform.

Received a Golden Pride Award and spot awards for significant contribution to Nortel UMTS project.

EDUCATION

Masters Electrical Engineering Program (Broadband Wireless and Internetworking), University of Ottawa, Ontario, Canada

Bachelor degree in Electrical Engineering, Telecommunications, Guilin Electronic Industry University, China

LANGUAGES English, Mandarin, Cantonese

CITIZENSHIP Canadian Citizenship, US Green card

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