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There are several types of API testing that should be executed depending the objectives. API is critical for ensuring quality, resilience and performance.
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The buy vs build decision includes cost, however it is not the only aspect. Reliability, performance, security, customization, and maintenance also play a role.
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There are certain software engineering techniques that improve software quality and ensure long-term fitness of software systems.
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Systems coupling has several dimensions. Hence, decoupling each aspect can take you in a different direction with conflicting trade-offs.