Web Application Architecture Plan

Architecture decisions are the most expensive decisions in software, because they are the hardest to reverse. Choosing the wrong data store or coupling your services incorrectly in month one becomes a six-figure migration in year two.

This document sets the technical foundation for your web application before build begins. It specifies the stack — frontend, backend, database, caching, and hosting — with the reasoning for each selection weighed against your team's existing skills, your budget, and your expected load.

You receive a component diagram showing every service and how requests move through the system, a data flow architecture covering reads, writes, and background processing, and a clear integration plan for every third-party service you depend on: payments, authentication, email, storage, analytics.

Security is addressed as a design concern rather than an afterthought: authentication strategy, authorisation model, data-at-rest and in-transit protection, secret management, and the input validation boundaries your application must enforce. The document closes with a deployment strategy covering environments, release process, and rollback.