apptension/developer-handbook

The Apptension Developer Handbook is a written guide that explains what a professional web or mobile app developer is expected to know, organized by role and experience level. It was created by a software development company called Apptension to answer the practical questions that come up during job interviews, new-hire onboarding, and career planning conversations. The handbook reflects the technology choices and standards that Apptension uses in production, so it reads more like an internal reference document than a general textbook. The guide is divided into three main sections. The Technical Stack section lists the specific languages, frameworks, and libraries the company works with, along with checklists of the most important concepts in each area. The Technical Guide section goes broader and covers topics a developer should learn to grow their skills over time, including areas beyond the company's core stack. The Technical Onboarding Checklist is a living document that spells out what developers joining the company are expected to know at different experience levels. The handbook covers four developer tracks: frontend, backend, DevOps, and mobile. The frontend section focuses heavily on React and the surrounding ecosystem, covering topics like state management, styling, routing, testing, animations, and browser considerations. The backend section centers on Python and touches on databases, testing, documentation, and third-party services. The DevOps section covers DNS, containerization, cloud services (mainly AWS), storage, and monitoring. The mobile section is built around React Native. The guide is openly published on GitHub under the MIT license, which means anyone can read it, fork it, or adapt it for their own team. It is written in English and does not require any special tools to read since the content is plain Markdown files. The handbook does note that some choices are opinionated and reflect Apptension's own preferences rather than universal best practices.