Robert Chang Email & Phone Number

Seattle, Wa, Us

Seattle, Wa

Dedicated performance engineering resource on the legacy Consumer Identity Service platform. Currently under Disney Entertainment & ESPN Technology -> Commerce, Growth, and Identity pillar.

Seattle, Wa

Dedicated performance engineering resource on the OneID product team. Currently busy supporting platform initiatives to onboard Disney+.

Seattle, Wa

Bringing 10+ years of performance testing and performance incident response insights to the cloud space.

Greater Seattle Area

As part of the technical marketing engineering team, produce technical whitepapers, best practices guides, educate the field about technical abilities of the Dell-EMC Isilon product line. Work closely with Product Management on feature details, work closely with Sales and system engineers, work closely with engineering leads, and engage in competitive research. Conducted performance testing of the Isilon SWIFT object store feature. Authored numerous performance metrics and API how-to blogs.Examples: https://community.emc.com/community/products/isilon/blog/authors/RobChang-Isilon-Seattle

Seattle, Wa

Expand upon the performance engineering foundation I have built at DTSS and lead onboarding-readiness efforts for Disney’s various business units (BU) onto the Disney ID registration & authentication product. Collaborate closely with Project Managers and Business Analysts on launch targets. Analyze production metrics to obtain accurate mixed case ratios for load tests. Optimize legacy shared services outside the immediate scope of Disney ID to address performance shortfalls of downstream dependencies. Utilize different load test tools based on trust-zone connectivity limitations – CloudTest for internet-facing applications, and BlazeMeter/Jmeter for internal applications. Work closely with the System Engineering group on environment configuration, capacity planning, and test execution. Work closely with Release Management on test environment scheduling, prioritization, and relationship-building with other businesses units.Key Contributions:• Led the 2014 ESPN-onboarding performance readiness effort involving capacity estimation, constraint discovery, constraint resolution, and capacity planning. Optimized HTTP inbound-handler threads with just the right number of JDBC connection limits to reach the start of CPU constraint – ensuring maximum utilization of all deployed resources. Other performance optimizations involve tuning OS ulimit, ephemeral port range, time_wait threshold, Apache PHP module version, Zend vs APC OpCache, JVM heap sizing, Eden to Tenured ratios, and selection of garbage collectors based on hardware layout.• Conducted thorough performance analysis for important onboarding milestones for Disney Infinity web & console games, Disney Movie Anywhere, Star Wars Attack Squadrons, and RunDisney.• Identified key JMX metrics from a myriad of Java applications, and integrated the metrics into SOASTA CloudTest monitors for a single dashboard view of key performance metrics from the front-end to the DB.

Seattle, Wa

Apply tried-and-true, simple-and-repeatable performance testing methodology to inter-connected REST-based APIs that make up the critical platform behind the Disney ID core services. Conduct solo performance testing efforts in a large production-sized environment to assess production readiness against projected volume growth. Analyze key metrics to explore performance tuning opportunities. Build and maintain a small-scale “laboratory” cluster of the Disney ID services for isolated problem identification and performance tuning. Report capacity assessment and explain performance concerns to stakeholders.Tools used: SOASTA CloudTest (integrated with Amazon's AWS), JMeter, BlazeMeter, AppDynamics, SolarWinds Orion for JMX metrics, OpenStack internal cloud-based virtual machines, Tomcat, JDK, SQL Server Management Studio, SQL queries, GitHub, Opscode Chef, Apache & DataStax Cassandra

Greater Seattle Area

Member within the highly visible Performance and Stability Incident Response Team. This team sets a gold standard at AT&T for performance testing methodologies with great track record. Oversees all performance-related issues in production and performance testing systems. Conduct solo research projects and/or performance testing projects involving production applications and prototype applications. Assist with performance testing of wireline and wireless applications. Write custom test harness and monitoring tools as required. Mentor test analysts in technical and problem-solving skills development. Most notable personal achievement is the successful end-to-end, pre-production performance testing of the U-verse iTV advertisement platform.

Greater Seattle Area

Performance testing (aka load testing / stress testing) of billing applications and related middleware that support daily operations of Cingular Wireless. Analyze a myriad of performance testing results and metrics, draft thorough analysis documents and present to stakeholders. Assisted in the performance testing of a key middleware system that allowed the successful launch of the first Apple iPhone on the AT&T network.Tools used: Mercury/HP Load Runner, Vugen, Performance Center, Wily Introscope, Cygwin, XFree, Xterm, Putty, BEA WebLogic, EJBs, Solaris 8, Solaris 10.

Greater Seattle Area

Firefighter: got traded internally between 3 QA teams under the QA branch. Ecomm QA: test Real's various order paths and ecommerce tools. Platform QA: test Real's internal Content Manangement System (CMS) that is used to create nearly all externally-exposed content (Real.com, Rollingstone.com, Rhapsody content, etc). Application Framework QA: perform SDET tasks to create Java-based test harnesses to test internal APIs and externally-exposed SOAP APIs. Unofficial coffee slinger.Tools used: Oracle RDBMS 9i, SQL*Plus, Toad for Oracle, DbVisualizer, Linux, Apache Tomcat, BEA WebLogic, Jboss, J2SDK, Eclipse IDE, coffee cup.

Redmond, Wa

Contracted through Volt to document Microsoft proprietary network implementations per DOJ anti-trust compliance. Sorted through lines and lines of Windows source code to find networking-specific content: flags, bits and bytes, etc. Created various sequence diagrams, protocol diagrams, and other documentations for non-Windows programmers. Special ownership of media-related protocols such as RTP, RTSP, ASF, WMS. The resulting technical documents are aimed at both the technical licensees as well as non-technical lawyers. The ability to discuss highly technical material in a very readable way is key in this postion. The documentation process followed a typical editorial/publication process that involved editors.Tools used: XMetal, Cygwin, XFree, Xterm, Microsoft Visual Studio

Greater Chicago Area

Act as the point-man for all RedPrairie WMS activities. Assist functional teams interfacing RedPrairie WMS product with 15 in-house systems. Prepare Solaris / Oracle / Windows environment into WMS instances for testing & training deployment. Test, compile, and deploy code drop of enhancements and bug fixes delivered by RedPrairie to ConAgra Foods' various WMS environments. Document end-to-end installation workflow.

Greater Milwaukee Area

RedPrairie (formerly McHugh Software Intl) produces a suite of logistics-efficiency software products that includes Warehouse Management System (WMS), Labor Management System (LMS), Transportation Management System (TMS), and several smaller, related products. As an entry level software engineer involved in the WMS, I part-took multiple maintenance deployments as well as new go-live deployments. As senior software engineer, I spearheaded most of the projects under the guidance of project leaders. Tasks include physically scoping the go-live site, diagramming areas of the warehouse, enter logical locations into the WMS product, and then customizing the WMS code base for the particular customer. Other specialized projects include integrating WMS time-cards with Kronos time management system, and leveraging open-source tools to customize label-printing.Customers: Proctor & Gamble, Georgia Pacific, GE Lighting, Longaberger, Michaels, ConAgra Foods, Foster FarmsTools: Oracle RDBMS versions 7 through 9i, HP-UX, Pro*C, C, Toad, Uniface 7Specialization: performance-tuning of SQL queries and PL/SQL stored procedures.