John Calvin Roberts

• Full-stack product engineering with Typescript, Python, and lots of Large Language Models

• Full-stack startup development using Typescript, React, Node JS, and Python
• Lead developer for Alpaca's Editor, built using advanced graphics tech such as Three.js, Fabric, and shaders
• Built subscriptions and billing infrastructure, taking Alpaca from zero revenue to positive cash flow
• Mentored junior teammates on topics such as Kubernetes, Postgres, and Typescript

• Full-stack developer on the billing team, using Python, Typescript and React Native.
• Leveraged knowledge of Kubernetes and Google Cloud Platform to decrease cloud costs for a major production Django application.
• Created a gRPC layer on top of an existing back-end service managing over 200k smart home devices during company-wide hackathon.

• Lead back-end developer on a team of 6 on the marketplace team, in charge of refactoring a critical hot path to use event-driven architecture with Go, AWS Lambda and SQS, processing more than 20k orders in a day. Our refactor greatly reduced order creation errors and improved data integrity.
• In first 3 months, worked closely with product & design on an overhaul of the front-end Checkout experience using React, Next.js, Tailwind, and Apollo GraphQL, resulting in high praise from company leadership.
• Went above and beyond the role of software engineer -- solved a long-standing authentication bug by designing a pattern for better read consistency from Postgres, reducing login failure by 20%; used load testing and profiling tools such as k6 to scale high-traffic pages to 10k req/second.

• Built a custom localized-for-China ecommerce middleware system utilizing Bull Queue and Redis to process over 100k orders per day for a major retailer.
• Served as code owner for a handful of multi-tenant microservices using Node JS, Nest, Typescript, and Couchbase.
• Designed a monorepo-driven strategy for rapid development of React dashboards for client projects, greatly reducing the amount of front-end developer capacity needed per client project.
• Mentored junior front-end developers, fostered a culture of positive and constructive code review among peers.

Le Wagon - Shanghai, China

Donghua University - Shanghai, China

Middlebury College - Middlebury, Vermont, USA

Lewis & Clark College - Portland, Oregon, USA