Vadym Ustymenko

Leading world-class engineers at Meta to build large-scale AI agentic infrastructure that safeguards integrity across billions of human interactions.

Built a suite of Healthcare products generating $50+ million annual revenue: - Hired, mentored, and scaled technical and business teams from 0 to 50+ people - Led 5 teams: AI, Business Intelligence, Mobile Apps, Infrastructure, Business Development - Served millions of users / patients Designed unique AI-driven Diagnostic and Risk Engines: - surpassed medical doctor's ability to diagnose and predict 1000+ conditions - peer reviewed technology - reputable medical sources - zero hallucinations. Successfully launched a wide range of Healthcare Products: - Customized EHR/EMR - Lab Information System (LIS) - LLMs, Voice streaming, and SOAP notes generation platform - Tele-therapy app - Digital Front door, Patient web and mobile app - Insurance verification - Revenue Cycle Management (RCM)

Designed architecture for Ethereum based sidechain bridging to ARK.io to attract Ethereum developers. The architecture was based on parity.io and Aura Consensus Protocol. Improved community adoption by publishing a few articles containing technical guidance on integration between ARK.io and enterprise blockchains: Official press release: https://blog.ark.io/making-cross-chain-smart-contracts-on-ark-via-hyperledger-fabric-e69149b1e12c ARK.io, Solidity Smart Contracts and Hyperledger Burrow - https://steemit.com/ethereum/@vadymus/ark-io-solidity-smart-contracts-and-hyperledger-burrow Comparison of Ethereum Compatible Blockchains - https://steemit.com/ethereum/@vadymus/comparison-of-ethereum-compatible-blockchains Running Smart Contracts in ARK.io via Hyperledger Fabric - https://steemit.com/hyperledger/@vadymus/running-smart-contracts-in-ark-io-via-hyperledger-fabric Launch your own blockchain with Hyperledger Composer - https://steemit.com/ark/@vadymus/launch-your-own-blockchain-with-hyperledger-composer How to install Ark 2.0 blockchain node on a cloud server - https://steemit.com/blockchain/@vadymus/how-to-install-ark-2-0-blockchain-node-on-a-cloud-server

- Designed architecture for the new Apple Online Store platform on a modern technologies stack. The platform benchmarked at 27K requests per second - Planned transition to the new platform from deprecated Web Objects framework with no interruption to the business - Introduced multiple techniques to speed up the system by 10X to enable personalization and targeting requested by business - Reduced by 3X need in publishers by completely re-designing CMS solution to make possible content sharing among web, mobile web and native mobile Apple Store platforms - Successfully managed 2 teams to get the new CMS solution implemented within tight deadlines. Coordinated migration efforts among multiple teams consisting of 100+ engineers Environment: Spring MVC, Java, Apache Tomcat, Web Objects, Servlets, Maven, Eclipse, Jenkins, SVN, Mockito, PowerMock, Mustache.java, Hazelcast, Memcache, Jersey, Scala, Lagom, Play, Cassandra, Docker, JPA, VirtualBox, AWS, Bitnami, Kafka, Solace, Play, Gradle, Spar, Solr, Lucene, Ansible, Hazelcast, Fail2Ban, Akamai

- Successfully led team of 10+ engineers to deliver mission-critical projects as a scrum master, running sprint schedules, daily stand-ups, design reviews, bug bashes, etc. - Provided architectural guidance for the front facing products handling millions of daily site visitors¬¬ - Architected & launched Electronics private sale site running on 64 servers and capable of handling 24 million daily users - Implemented numerous RESTful web services with request volume requiring 24 servers - Implemented personalized pages hierarchy starting with Electronics home page sustaining millions of daily hits - Trained team members on open source libraries such as jQuery to replace proprietary eBay frameworks - Designed Cell Phone Fin¬¬der – a rich web client powered by multiple RESTful web services • Brought eBay’s iPhone page to top 10 results in Google search through numerous Search Engine Optimizations (SEO) Environment: Spring, Java, OSGi, Apache Geronimo, Servlets, JSP, Jersey, Tomcat, Jetty, Maven, Eclipse, Aptana, NetBeans, Jenkins, ClearCase, JavaScript, Twitter Bootstrap, Less, Nuxeo, jQuery, HTML 5, CSS 3, EHCache, JSUnit, JSTestDriver, Jasmine, Oracle, MongoDB

- Successfully managed team of contractors to deliver the first version of Y! Credit Cards Portal - Designed architecture for several front facing products scalable to sustain millions of daily users - Implemented SAAS business intelligence system working on top of 150TB+ Oracle warehouses, 12TB MOLAP cubes and 30+ petabyte Hadoop data warehouses - Was designated security expert (Y! Paranoid) overseeing security compliance of the new features and projects Environment: Tableau web/server/desktop software, Microstrategy, MOLAP/ROLAP, custom ETL, Microsoft Analysis Services, Microsoft SQL Server, Oracle, Java, Servlets, JSP, Struts 2, Spring Security, Hibernate, Web Services, JBoss, YUI, Ajax, JavaScript, HTML/DHTML, Maven, NetBeans, BugZilla, Hudson, Cobertura, VMWare, RHEL.

- Implemented test framework based on TestNG for the application dealing with importing clients provided content in bulk. The framework was designed to be easily extended by QA (without coding efforts) for end-to-end testing. - Designed and implemented proprietary solution for validating bulk content. 95% of the validation logic was coded in PL/SQL, what allowed achieving blazing fast performance while validating hundreds of millions of rows. Environment: Oracle, PL/SQL, Java, Spring, Hibernate, AJAX, ZK, SOAP, JBOSS, UML Magic Draw, AndroMDA, Maven, Eclipse, SVN, Sourceforge, TestNG.

- Completely implemented functionality for removing the users including UI, new server API, and back end stored procedures for all the four supported RDBMSs: Oracle, MySQL, DB2, MSSQL - Wrote several upgrade scripts for different versions of the database schema. - Fixed numerous bugs and implemented several enhancements throughout the product. Environment: Java, Servlets, JSP, Struts, Spring, iBATIS, SOAP, JAX-RPC, SAAJ, JAXB, SOAP Sonar, Tomcat, WebLogic, WebSphere, Oracle, MySQL, DB2, MSSQL, JavaScript, HTML/DHTML, Macromedia Dreamweaver MX, Ant, Eclipse, MyEclipse, BugZilla, VMWare.

- Was solely responsible for the implementation of all the new features in the web-based Administrative Console for Access Manager 6.0 (http://www.emc.com/security/rsa-identity-and-access-management.htm): admin groups’ hierarchy management, support of thousands of admin groups, flexible reusable sorting framework. Extended functionality and improved performance of proprietary caching mechanisms. Designed numerous pages, re-branded the existing ones and introduced a lot of major usability and presentation enhancements. Updated Ant build script with useful tasks that reduced compiling/deploying time for developers. - Extended the server API with new functionality: creating admin group directly as a child of another admin group, moving nodes of admin groups between parents. Updated client-server communication protocol accordingly. Updated JUnit regression tests suite to cover the new functionality. - Participated in rigorous code compliance reviews by 3rd party quality certification companies. Fixed hundreds of bugs including critical security issues throughout the product. Environment: Java, Servlets, JSP, JSP TagLibs, Tomcat, Oracle, MySQL, DB2, MSSQL, LDAP, Struts, i18N, JavaScript, HTML/DHTML, Macromedia Dreamweaver MX, Ant, NetBeans, Perforce, Cygwin, BugZilla, VMWare.

Product: Online Knowledge Examination Responsibilities: - Analyzed the business processes; proposed architecting solutions to provide reliability, flexibility, performance, scalability, extensibility and reusability. Designed use case/sequence/collaboration/class diagrams. - Presentation layer: created web tier using Jakarta Struts, widely used DHTML & JavaScript, wrote several JSP TagLibs. - Business layer: implemented middle layer components – EJBs (stateful/stateless session beans), JSPs. - Persistence layer: designed Entity beans using TogetherControlCenter IDE. - Used HTTPUnit combined with JUnit to test web-tier of the application. Used Cactus to test Entity beans with local interfaces. Product: FACETTE ( www.facette.de ) Client: IDENTI.NET Internet + Software Services GmbH ( www.identi.net ), Austria Responsibilities: - Fully implemented Authentication and Authorization mechanisms. - Designed database structure and implemented specific to HSSQL stored-procedures based on Java classes. - Extended JTabbedPane’s Look & Feel in compliance with customer’s screen design forms. - Designed custom Swing components. - Was responsible for design of an UNDO manager which dealt with events processing. - Carried out rigorous testing via JUnit and HTTPUnit. Environment: Java, J2SE, J2EE, Servlets, JSP, HSSQL, ERWin, JDBC, JavaScript, DHTML, Macromedia Dreamweaver MX v6.0, PhotoShop 5.0, XML, JUnit, HTTPUnit, Ant, JBuilder 9.0, C++, MFC, STL.