Gaurav Singh

• Designed Map-Reduce algorithms to process large data processing and creating fast ruby serialized objects • Developed reusable meta-programmed Ruby modules to integrate Scala/Spark queries to read large csv/parquet files • Designed a write only producer and read only consumer model by uploading MySQL result sets to S3 and making it thread-safe for consumers to read • Developed full-stack features

• Designed a Size Flexible Reserved Instance Optimization feature to recommend cheaper instances based on their on-demand instance usage • Developed new features for Kubernetes, Mesos and AWS ECS metric collection • Designed and developed AWS lambda functions to schedule reporting jobs using Python, Jenkins, SQS • Designed and developed an asynchronous solution for deleting database records using Ruby and Resque • Developed new REST Endpoints (API) for Kubernetes, Mesos and ECS collection

• Developed new features in the product using Ruby, Rails, MySQL, AngularJS • Designed and developed new queues to support hourly collection of metrics from AWS Cloud Watch API • Wrote new Cron Jobs for Data Migration • Designed RESTful APIs for on-boarding new customers • Improved performance for back-end processes by 50% for real-time availability of data to customers • Managed Infrastructure through weekly PagerDuty Rotations

• Refactored reporting modules to support multiple transactions such as chargebacks, interchange fees • Fixed bugs for various payment provider endpoints to calculate chargebacks, fees and authorizations • Developed a difference tool to test the correctness of the refactored version with over 3 million records • Parsed CSV, PDF, HTML payment reports to generate different payment fee MongoDB records using Python • Developed a First-in First Out scheduler to fetch payment reports

Large Volume Data Filtering of 3D Printed Category Products • Developed a scalable system that consumes Ion (JSON) messages and filters products using Java and Spring • Implemented the system by intercepting the data from a real time service (Chunk Store) • Processed 25,000 – 30,000 ion messages in one minute from the SQS Queue • Wrote a File Handler to write Ion Messages handling operations like rolling over files by time and size

• Developed a system that migrates data from salesforce.com database to PostgreSQL using Ruby and salesforce.com Metadata API deployed on Heroku. • Improved and revamped the user interface of the CRM System by making it simpler and intuitive using JavaScript and jQuery Framework • Developed a tool to perform static analysis on programs written in Apex and Visualforce using Java • Analyzed naming conventions (enforcing camel case) of programs written in Apex and Visualforce

Program Design Paradigms, Algorithms, Database Management, Web Development, Computer Systems, Data Mining Techniques, Information Retrieval