Orest Khrapko
Verified Expert in Engineering
Software Developer
Warrington Township, PA, United States
Toptal member since October 14, 2014
Orest is a highly skilled senior developer/architect with extensive development experience in system design and implementation using .NET stack: C#, .NET Core, MVC, Web API, SQL, and Entity Framework. He is passionate about JavaScript and related technologies, such as Angular, Vue.js, Ionic, jQuery, or Node.js. He has built many complex world-class products from start to finish, making every project he works on a success story.
Portfolio
Experience
- C# - 14 years
- Ionic - 6 years
- Angular - 6 years
- Amazon S3 (AWS S3) - 5 years
- Azure - 5 years
- .NET Core - 4 years
- Vue - 2 years
- React - 1 year
Availability
Preferred Environment
Azure, .NET Core, Web API, Ionic, SQL, C#, JavaScript, Angular, Amazon Web Services (AWS), React
The most amazing...
...things I've designed and developed are complex SaaS applications.
Work Experience
Senior Enterprise Architect
CardWorks
- Analyzed, upgraded, consolidated, and mapped enterprise applications, mobile strategy, and development.
- Designed and implemented a SaaS to support a new line of business in credit card origination. The main modules included credit bureau integration, identity verification, multiple pricing model support, multiple line assignment model support, and more.
- Designed and developed a multi-tenant mobile application.
Senior Enterprise Architect
Advertising Specialty Institute-ASI
- Redesigned a supplier’s product update flow that reduced product update propagation to all downstream systems from 24-48 hours to near real-time. Flow simplification allowed for retiring around 15 auxiliary applications.
- Architected a new service-oriented framework built with the latest technologies, including MVC, HTML5, ASP.NET Web API, Entity Framework, Knockout.js, RabbitMQ, and RequireJS. The new framework improved time to market, productivity, and performance.
- Designed and architected reviews, recommendations, and approval for all changes in the development sprint. Assessed proposed application changes and came up with the most optimized system/change implementation and reusability method.
- Integrated and designed applications regarding an ASI identity provider using an OAuth2 protocol.
- Helped set up a continuous integration server using Jenkins.
Architect
ASI
- Created a proprietary application framework that addressed the modern UX, security, performance, flexibility, extensibility, scalability, and content management-related issues needed to support users and enable full cross-product integration.
- Integrated Oracle CRM single sign-on using SAML and Oracle web services for customer information integration.
- Oversaw the architecture of migration to distributed version control (Git).
- Acted as technical lead and architect on an ESP websites project. This product allows distributors to have a fully functioning eCommerce site in a few easy steps.
- Improved time-to-market for new products with the framework by 40% through re-engineering and unifying security, UI rendering mechanisms, and middle-tier object repositories, and utilized a modular approach to development for greater code reusability.
Technical Lead
Advanta Business Services
- Worked on infrastructure design and implementation of Advanta’s online originations and underwriting systems using Provenir, web services, Interwoven, and ASP.NET.
- Designed and did end-to-end setup and implementation of Advanta’s underwriting flow using Provenir. This includes: infrastructure setup with MQSeries, Tomcat, LDAP, JRE, and more; Provenir software configuration with different adapters and third party hooks like credit bureau integration, address validation services, identity verification services; and integration with other systems in the Enterprise-like web, back office, and servicing platforms.
- Coded underwriting workflows, scripts, and adapters for Provenir.
- Designed and developed various web services (SOAP) and websites using ASP.NET, ASP, ColdFusion and Interwoven (Java, XSLT, XSL).
- Maintained the Interwoven controller layer using Java and web services.
Senior Developer
Advanta Business Services
- Maintained and developed a web-based customer service interface for a credit decision application.
- Developed various web services and websites.
- Worked with a team to convert advanta.com to use the Interwoven CMS system.
- Developed various applications and support utilities using VB.NET 2.0, 1.1, and VB6.
- Modified, maintained, and upgraded proprietary credit decision systems from Provenir. Created workflows, scripts, and adapters using JavaScript and VBScript.
- Upgraded applications and systems from Sybase to Oracle.
Software Developer
Advanta National Bank
- Developed web applications using Oracle web agent packages.
- Created an online banking site for Advanta Bank Corp. using ASP.
- Developed multiple reports using an SQR reporting tool.
- Performed Oracle DBA tasks such as backups and software upgrades.
- Implemented Y2K modifications on existing financial software.
Education
Bachelor of Science Degree in Computer Science
Drexel University - Philadelphia
Associate of Engineering Degree in Mechanical Engineering
Lutsk State Tech University - Lutsk, Ukraine
Certifications
AWS Certified Developer Associate
Amazon Web Services
AWS Certified Cloud Practitioner
Amazon Web Services
Skills
Libraries/APIs
Stripe, RequireJS, Underscore.js, Vue, Entity Framework, REST APIs, AMQP, Sammy.js, React, Web API, jQuery, Log4Net
Tools
TFS, Git, StructureMap, Jira, Jenkins, Navicat, Bower, Webpack, Ninject, IBM MQ, Apache Tomcat, Eclipse IDE, Babel, RabbitMQ, Amazon Simple Queue Service (SQS)
Languages
SQL, HTML5, C#, JavaScript, CSS, HTML, TypeScript, PHP, SAML, VB.NET, XSLT, XSL, Active Server Pages (ASP), XML, SQR, Visual Basic 6 (VB6), Java
Frameworks
Angular, ASP.NET MVC, Ionic, Bootstrap, .NET Core, Kendo UI, Knockout (Knockout.js), JavaScript MVC, ASP.NET, ASP.NET MVC 4, ASP.NET Web Forms, AngularJS, .NET
Platforms
Twilio, Azure, Mobile, Oracle, Amazon Web Services (AWS), Endeca, Adobe ColdFusion, WebSphere MQ, LAMP, Linux, Amazon EC2, AWS Elastic Beanstalk
Storage
HTML5 Web Storage, JSON, Elasticsearch, Memcached, Membase, Redis, MySQL, Amazon S3 (AWS S3), Microsoft SQL Server, Oracle DBA, MongoDB
Paradigms
REST, Mobile Development, Web Architecture
Other
Software Development, Front-end, Mobile Applications, Ajax, Web Services, MSMQ, Content Management Systems (CMS), Computer Science, Mechanical Engineering, Architecture, Amazon RDS
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