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basic TypeScript • basic Jest
skills learned
reproduce “ghost in the machine”-type problems with integration tests • create in-memory Nest.js applications
Daniel Coleman and Max Guernsey, III
1 week · 2-4 hours per week · INTERMEDIATE

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You’re a TypeScript developer for a large company that sells stock photography. You’re responsible for the service that ingests images, and this service depends on another subservice: the pricing microservice. As proven by their individual unit tests, each service works as specified. But when the services are combined, new customers are locked into one pricing table—even those that should have access to pricing that fluctuates depending on factors like promotions, flash sales, and price-tuning. Working in IntelliJ WebStorm, you’ll solve this problem by writing an integration test that connects and runs the two services together, letting you reproduce the problem locally.

This project is designed for learning purposes and is not a complete, production-ready application or solution.

project authors

Daniel Coleman

Daniel Coleman has been writing software since he was twelve years old, and has been getting paid for it for the last ten years. He quickly progressed from individual contributor to trailblazer for software design excellence, turning his teammates into fellow disciples of high quality. Dan has also worked as an embedded coach for teams, helping them perfect their craft through best practices for code design, test-driven development, behavior-driven development, and effective requirements management. He shares his thoughts on the industry and software design at

Max Guernsey, III

Max Guernsey has over twenty years of experience in software development and is currently a managing member at DevCraft LLC. He has worked on a wide range of products and technologies, including C++ class libraries, financial analysis applications, C# and Java backends, and even multi-platform video games. He is an experienced consultant and his "coaching from the keyboard" approach provides hands-on experience to learners in all aspects of modern software development.


This liveProject is for developers with an intermediate-level understanding of TypeScript and object-oriented design. To begin these liveProjects you’ll need to be familiar with the following:

  • Basic Jest
  • Basic Nest.js
  • Working knowledge of TypeScript 4.x
  • Working knowledge of object-oriented programming


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