Mark Xu Email & Phone Number

Tampa, Florida, United States

Description:- Led efforts to maintain, enhance, and re-architect high-volume low-latency ad bidding systems.Key Activities:- Integrated multiple real-time bidding ad demand partners and optimized system performance using IAB/OpenRTB 2.5 standards.- Designed and maintained CI/CD pipelines using CircleCI, Flux CD, and Helm.- Developed infrastructure as code (IaC) using Terraform, deploying to GCP.- Prototyped a reporting engine in Python leveraging Google BigQuery for data analytics.- Developed and deployed new features to production environments.- Provided daily production support and participated in rotational on-call duties.

Tampa

Environment: - Java, Spring Boot, Spring Framework, Spring Cloud, Rest API, Janus Grapph, Linux, Docker, Kubernetes, GCP, Google Big Query, Google BigTable, Google Pub/Sub, Terraform, Jenkins, CircleCI, Prometheus/GrafanaDescription:- Led the development of production-quality audience services for Rakuten Ad Exchange.Key Activities:- Evaluated JanusGraph database and developed a prototype for audience services using the graph database.- Designed and implemented the full functionality of Audience Services using Java 18, Spring Boot, Spring Cloud, and REST APIs.- Built and integrated a CI/CD pipeline for the project using Groovy, Terraform, and GitHub.- Developed infrastructure as code (IaC) for Google Cloud resources, including Serverless, Bigtable, and Kubernetes.- Created production support tools and handled day-to-day production support duties.- Onboarded and trained a new graduate, facilitating their integration into the team.- Performed production support duties

Tampa, Florida, United States

Description:- Led efforts to enhance new product features of the affiliate marketing commission engine and modernize it to a scalable, high-performance architecture.Key Activities:- Developed new functionalities using Java 11 with Spring Framework, deployed to production, and handled production support responsibilities.- Re-architected the monolithic Java-based commission engine into microservice-based implementations using Go, enhancing scalability and performance.- Built and managed CI/CD pipelines with CircleCI for efficient deployment.- Deployed application services to an On-Premise cloud environment using Chef and Ansible.- Led a team of 3-6 developers across multiple time zones (US, EU, Asia), onboarding new engineers and facilitating team collaboration.- Supported Project Managers and Product Managers, occasionally stepping in as Scrum Master to ensure project delivery.- Developed tools for production support and provided daily operational assistance.

Tampa, Florida, United States

Description:- Led efforts to maintain, enhance, and re-architect the high-volume Orbital Gateway financial transaction system. This system provided load-balancing and failover capabilities to ensure secure, reliable, real-time OLTP for merchants. Key Activities:- Integrated new types of financial transactions, including fraud analysis, soft declines, and gift cards, using gSoap, Xerces, Tuxedo, C++, Java, and Oracle (PL/SQL, OCCI) on HP-UX.- Implemented the ProFTPD authentication system using ODBC and Oracle Database on Linux.- Increased processing capacity from under 1 million to over 10 million credit card accounts by optimizing performance and scalability in offline processes, including the Account Updater System (automatically updating credit card account info) using Tuxedo, C++, and Oracle (PL/SQL).- Re-architected the Account Updater System with Informatica, improving performance, reliability, and maintainability.- Enhanced the Managed Billing System by adding audit trails and optimizing Oracle database queries, improving reliability and performance using Tuxedo, C++, and Oracle (PL/SQL, OCCI).- Acted as Agile ScrumMaster, coordinating with cross-functional teams and managing stories and success criteria.As a team lead, refined both functional and non-functional requirements, designed system architecture, and conducted high-level design and task estimation.Developed merchant configuration system with a NodeJS and AngularJS-based frontend and backend.

Tampa, Florida, United States

Description:- Led the expansion of the Media Monitoring System (MMS) to support both analog and digital TV signals, incorporated new Nielsen Reference data, and ported the system from SunOS to a Red Hat/Fedora Core Linux environment on Intel-based PCs.Key Activities:- Implemented software components using C/C++, Java, STL, and Boost C++ libraries.- Developed core system components on Unix (Linux/Solaris) using Unix IPCs like Shared Memory, Memory Map, and Sockets.- Ported application code from Solaris to Linux, resolving endian issues (Big Endian to Little Endian), converting to POSIX, and upgrading the build system with GNU Make and GCC.- Upgraded the system from Red Hat 7.3 to Red Hat 9.0 and subsequently Fedora Core 7 and 12.- Updated the system to modern C++ standards, replacing the Rogue Wave libraries with STL.- Developed a transport packet streaming application using various network protocols such as HTTP, TCP/IP, and UDP/IP.- Configured, built, evaluated, and upgraded the Linux kernel.- Configured Linux servers (partitioning disks, managing services like sshd, telnetd, ftpd, ntpd) and monitored server performance using tools such as sar.- Developed a class hierarchy for Nielsen reference data in Java.- Created tools for correcting XML data using JAXB, JAXP, and XML/XSLT.- Developed video format conversion software using Java Media Framework (JMF).- Developed a web-based Clip and Statistics Viewer using HTML, Servlet/JSP, Apache Struts, and Apache Web Server/Tomcat.- Built reporting tools using HTML, Servlet/JSP, Struts, and Perl CGI scripts- Developed an MPEG-2 Transport Stream processing system.

Tokyo, Japan

Description: - Contributed to the development of a scalable, secure, and high-performance net-centric solution for an insurance information management system. Activities:- As a member of the Common Object Broker Architecture for Large Transactions (COBALT) team, developed a real-time, thread-safe graphing component using JDK 1.1.6.- The component generated graph images in GIF format for display on web browsers, utilizing Netscape Enterprise Server, Netscape Application Server, Oracle 7, and JDBC.

Tokyo, Japan

Description: - Developed core components for a Product Modeling System aimed at reducing development costs in the manufacturing industry by providing reusable C++ class libraries. Activities:- As part of the development team, created a geometry library that supports multi-user concurrent access using UNIX sockets over the TCP/IP protocol.- Developed the library in C++ on Solaris 2.5, ensuring robust and efficient communication between system components.

Master Of Science - Ms, Computer Science

Bachelor Of Engineering - Be, Computer Science