David Leonhardt Email & Phone Number

Toronto, CA

Chicago, IL, US

• Lead designer of Tractiv's initial backend stack and structure.
• Built file encryption flows with Node.js and AWS S3.
• Built our immutable ledger with GoLang as well as an internal load/connection balancer for our immutable data store.
• Translated shareholder wants and needs into architectural design and features.
• Mentored developers in both TypeScript and GoLang.

Denver, CO, US

• Worked on projects for early stage startups taking them from ground zero to fully fledged products
• Built core tools for use in blockchain monitoring for multiple of our clients* Worked with product to advise potential clients on how we could help them reach their technical goals𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀:
• EquaStartProject - Developed a TypeScript API with a complex permission structure and payment processing - Migrated a production Mongo database to AWS RDS Postgres instance - Used Microsoft Sharepoint and AWS S3 for.
• AmadeusProject - Architected the micro-service structure to support a Swift chatbot application - Built and deployed a Node.js/TypeScript web-server to EC2 - Reviewed and tested pull requests before merging to production
• MinotaurProject - Built a Kotlin/Typescript blockchain monitor that parsed and stored blockchain data - Optimized our Postgres database by indexing and creating SQL views - Monitored and debugged our EC2 and RDS.
• PandoProject - Built a private blockchain technology and JavaFX ledger application with Kotlin - Worked to design an "opt-in" trustless system similar to IBM's Hyperledger Fabric - Used SQLite for the desktop.

Learned how to instruct others in Alexa Development from Amazon. Was responsible for teaching three 6 hour Alexa development courses that introduced the concept of a Voice User Interface or VUI, writing code in a language of the students choosing to interact with Amazon's voice processing API, and deploying the application as serverless Lamda function.

Graduated in the g49 Cohort with over 1000 course hours of both learning and building with Node.js, React, React Native, AngularJS, Postgres, and more.

Purchased products based upon sales trends, kept track of inventory by creating a inventory count schedule, and provided tech support for the management team. Installed AvertX Camera systems, managed our Lightspeed POS system, worked with Zoho CRM, Zoho Books, and Zoho Reports, sent out POs handled invoices, established and maintained wholesale.

Madison Heights, MI, US

Was responsible for accurately packing and shipping online orders from the warehouse, making transfer requests from other stores, and selling mountaineering equipment to customers.Was a part of our stores highest recorded day of sales. Worked our booth at climbing and mountaineering events.