Software Development Lifecycle

Software Development Lifecycle (SDLC) is the process a team follows to plan, build, test, ship, and maintain software through a set of distinct phases. It exists to make delivery repeatable and to catch problems early, when they are cheap to fix, instead of after release, when they are expensive. Implemented as waterfall, iterative, or modern agile and DevOps flows, it is the connective tissue between an idea and software that stays healthy in production.

• Requirements gathering - Understand and document what the software needs to do before design begins.
• Design and implementation - Turn requirements into architecture, contracts, and working code.
• Testing and quality assurance - Validate behavior continuously so defects are caught before customers see them.
• Deployment and maintenance - Release safely, then monitor, patch, and evolve the system over its life.

When I apply this thinking to APIs, the lifecycle becomes design-first and contract-driven, mocking an API before it exists, testing against its contract, and governing it at every stage rather than bolting checks on at the end. That is the difference between an API you can trust and one you merely hope works. It is the same discipline as the broader software development life cycle, tuned for a world where the interface is the product and both partners and agents depend on it behaving consistently across every release.