Yonah Wahrhaftig Email & Phone Number

Katzrin, Golan Heights

• Developed system to retrieve market data in real time reaction to market using SQS, Lambda and Sraper API.• Updated existing applications infrastructure to Cloud Formation stacks using AWS CDK.• Presented to entire company on benefits of Infrastructure As Code (IAC) and other dev ops practices.• Refactoring of existing systems to bring their code bases inline with updated development practices.

Salem, Oregon, United States

• Developed a system to retrieve OCLC classification information for new titles to quickly identify textbooks, using ECS, SQS, Lambda and DynamoDB.• Designed and developed suite of services to react to market events and update textbook buyback prices using AWS Lambda and DynamoDB. Infrastructure created and managed using CDK and Cloud Formation. Monitored services via Cloud Watch.• Promoted adherence to professional software development principles, especially code reuse and unit testing.

• Managed 10 member development and QA teams.• Led development for Ruby API supporting multiple sites along with Vue.js clients• Maintained Heroku servers and deployments• Implemented SDLC practices and set coding standards

Israel

Full stack developer building new features and improving existing features on an ASP.NET MVC project with Razor views, Bootstrap and jQuery on the front end.

New York, Ny

Maintained and improved a large proprietary trading system.Developed a system for simultaneous data collection from over 250 machines using partitioned tables in SQL Server. Experimented with MondgoDB and Redis before settling on MS SQL Server.Developed as member of 4 person team a client-server system for consuming binary messages from an external vendor and forwarding them to the appropriate clients.Developed as member of 6 person team communication layer of trading application for interacting with the CBOE.Developed as member of 4 person team an order routing system to route orders from trading applications to the appropriate vendors taking cost and availability into consideration.Member of team developing and maintaining business applications moving from large monolithic trading application to a service oriented architecture.Windows FormsWPFMulti ThreadingHigh Performance

Built an inventory management system in ASP.net using barcode scanners for input.Began development of McaTracking, a Ruby on Rails web app to manage cash advance loans with split payments.Managed deployments and setup of Nginx web servers with Unicorn application servers, using puppet.Used git for source control.

Worked on a shared ASP.net code base powering 23 e-commerce sites. Introduced SOLID principles and unit testing to the team. Built a custom log shipping solution for warm SQL server failover.

Built custom Asterisk PBX solution from the ground up for the office as well as a platform to allow cell phone customers to check how many minutes they had used. Supplied reports on customer usage and spending using MS SQL and Power BI.