Hen Sapir



Software Development Engineer II July 2017 - Present

Alexa Cloud Platform team.

  • Re-architected the Alexa Cloud platform to enable delightful multi-device experiences, including features such as I/O decoupling, named-device targeting, multi-room music, 3P distributed audio, group targeting, and visuals targeting.
  • Designed, developed, and launched services that enable customers to, via a VUI and GUI, implicitly control any Alexa-connected device in their environment, including Echo, 3P AVS, Fire TV, Smart TVs, and Smarthome devices. These are low latency, highly available services that serve billions of requests daily.
  • Served as an operational readiness bar-raiser. Reviewed service and feature launches within Alexa to help ensure that teams were operationally prepared to launch. Facilitated blameless post-mortems for customer-impacting outages.


Software Development Engineering Intern June 2016 - September 2016

Mobile Identity Services team.

  • Designed, developed, and launched an event-driven Transaction Intent Verification service. This provides out-of-band authorization for high-risk transactions conducted on Amazon. Verification channels include push notifications, SMS messages, phone calls, and Alexa. It serves as a safer replacement for the older OTP authorization system, which was susceptible to phishing attacks.
  • Built an internal dashboard to monitor all customer verifications conducted by the TIV system.
  • Tools used included: Java, AWS DynamoDB/SNS/SQS and IVONA text-to-speech.

Freelance Software Engineer

October 2014 - May 2017

While I was a university student, I worked on numerous freelance projects for a few companies. Below are some examples.

  • Labspend: designed, developed, and launched the frontend and backend for the consumer and vendor webapps. Using Python, Scrapy, and Selenium, built a distributed scraping network of servers that mine, manage, and clean chemical purchasing data.
  • Univeristy of Michigan CAEN: refactored and migrated on-site hosted web services to AWS. Lowered hardware costs, increased service availability, and simplified deployments.
  • Apptopia: Built a distributed scraping service that gathers SDK data for every app on the iOS App Store and Google Play Store. Exposed this data with a RESTful API.


University of Michigan

Sep 2014 - May 2017
Bachelor of Science - Computer Science

GPA: 3.82 / 4.0 | summa cum laude


Python, Java, C++, Golang, PHP
HTML, CSS, JavaScript, jQuery, BackboneJS
AWS (DynamoDB, SQS, SNS, S3, Lambda), MySQL, Postgres, Linux, Apache, Nginx, Git, Bash