Stephan Tarulli

Experience

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  Vecima Networks Inc.

  Sept 2012 - Jul 2014

  Software Engineer

  Front & back-end developer for a fleet diagnostics and tracking web application using Javascript and Node.js APIs running on Amazon EC2.- V2 design of a real-time fleet diagnostic web application.- Communication channel between hardware and software teams.Technologies: Node.js, Ember.js, AWS, C, protobuf

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  Vendasta

  Aug 2014 - Nov 2016

  Software Developer

  Front & back-end developer for multiple webapps with Python backends hosted on Google Cloud Platform.- Scalable service for marketing automation.- Multi-layer persistence: datastore, memcached, & ElasticSearch.- Distributed & concurrent transactional tasks.- Complex frontends written using Knockout.js and SCSS.- Many 3rd party & social media API integrations.Technologies: Python, Javascript, GCP, Java, ElasticSearch, SCSS

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  KIXEYE

  Nov 2016 - Oct 2020

  Staff Software Engineer, Technical Lead

  Technical leadership & individual contributor for core infrastructure & live operations team. Responsible for revenue critical, company-wide services for mobile games.- Rewrote and maintained a large-scale telemetry system in Node.js handling 2+ billion events per day which guides all business decisions and revenue generation.- Delivered intra-team and inter-team optimizations yielding multiple order-of-magnitude performance improvements at scale resulting in mean HTTP response times under 40ms and p99 response times under 200ms.- Created petabyte scale telemetry data-warehouse with data duplication detection and telemetry data partitioning.- Built purchase-offers system in Python for game economists to target users based on SQL queries, resulting in nearly all company revenue and ROI in hundreds of millions USD.- Implemented audit logging for purchase-offers handling tens-to-hundreds of millions of data updates per half-hour.- Created self-healing Jenkins system for purchase-offers system to ensure no interruptions to critical revenue services.- Built clustered, isolated query balancer to handle thousands of gigabyte-to-terabyte sized SQL queries per hour.- Optimized data-warehouse utilization to achieve over US$200,000/year savings.- Converted many systems to CloudFormation for disaster recovery and documented failure modes and play-books for on-call responses for many systems.- Guided technical architecture decisions for critical systems by joining cross-team discussions related to new game features.- Mentorship of junior and senior engineers, and data analysts on wide-breadth of topics.Technologies: Node.js, Python, C#, PHP, AWS, GCP, IBM Cloud, MySQL, Snowflake, Docker, Redis, MongoDB, Ansible, Puppet, Jenkins, Git, Perforce, RabbitMQ Show less

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  East Side Games

  Feb 2021 - Aug 2021

  Senior Software Engineer

  Technical leadership with a focus on reliability and performance. Contributed across 3 teams supporting the IdleKit platform for mobile games in areas such as DevOps, engine optimization, and backend services & performance.- Handled multi-threading improvements to game engine SDKs, like analytics data collection, for greater reliability and performance across platforms.- Spearheaded soon-to-be company-wide automation changes around continuous integration and release trains for faster delivery of higher quality products to customers.- Improved disaster recovery plans and AWS infrastructure maintainability for greater reliability and better on-call support.- Worked to organize modernization plans for technical stacks in an incremental manner.- Provided technical mentoring to other team members. Show less

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  Change.org

  Sept 2021 - Aug 2022

  Staff Software Engineer

  Technical leadership around revenue critical backend systems and frontend interfaces.- Designed and led implementation of an automated refunds system with audit logging support.- Designed and led implementation of intelligent offers system to maximize revenue and minimize refunds.- Instituted process changes to improve delivery time for squads and disseminated knowledge across the company.- Created a lightning talks programme for mentoring other engineers.- Mentoring other engineers 1:1- Debugging and patching performance issues for revenue critical systems. Show less

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  Jane.app

  Sept 2022 - now

  Staff Software Engineer