Jinnan G.

Storage & Data Lake team - data storage management - online storage

- Cloud Infrastructure Team: service mesh, CDN, DNS, load balancer. Framework used: istio - Search Team: search engine optimization Backend development on organic search for Airbnb

Software Development Engineer at Alexa (distributive platform team under Alexa OS) • Designed, implemented and maintained RESTful APIs across two Tier-1 platforms to manage Alexa customer preference data, open to internal services and devices, 3rd party skills and devices, with an average traffic of ~50k TPS • Developed mechanisms to sync between cloud and Alexa devices with restricted latency, high availability and scalability, with an average traffic at ~47k TPS • Proposed, designed and led the project of a Tier-1 service migration with an average traffic of ~35 TPS and 8 main APIs, including database migration, without impacting service availability and latency, benefited 60+ internal services • Voluntarily improved integration and performance testing frameworks by adding new mechanisms for Alexa skill authentication token generation, improved test performance, pipeline propagation speed and reduced 1000+ lines of code • Established oncall service dashboards and alarms via LPT/Ruby • Designed data streaming platform that produces business metrics in 3 market places, using SQL, AWS Kinesis/ Firehose, SQS, SNS, Lambda and Redshift • Mentored intern and new hires by proposing project, providing guidance on design, assisting in implementation, providing code reviews and adding integration and load test

• Analyzed the architectural, design and performance differences between Kafka and Event Hub to support Siphon, a real-time big data publishing and subscribing service • Integrate Event Hub (Azure big data bus) into Siphon; implemented data sending, receiving, metadata checking and topic creation functionalities so that Siphon can run fully on Event Hub

• Work with a group of 4 students on building and designing websites for Vocate, a startup company

• Programmed 22 user stories (using Agile Scrum methodology) on Foreign Exchange trading order account allocation, including new UI in order entry, order booking, order summary and blotter preview using Flex (XML, ActionScript) • Built corresponding backend functionalities using Spring and saved order allocation to database using Hibernate • Organized first Agile Scrum project, wrote product backlogs and organized bi-weekly meetings

• Developed Lexos, an open-source text analysis tool suite, as part of the Lexomics Research Group in both front-end and back-end coding (using Python, Flask and Jinja, JavaScript and jQuery) • Collaborated and programed the K-Means and Hierarchical Analysis pages for text analysis, which involve various cluster analysis techniques and visualizations • Coded to provide silhouette score on K-Means analysis using Scikit Learn Machine Learning Package, presented numerical measurement on the precision of Lexos • Converted text file language to make Chinese characters compatible, expanded input files to multiple languages