# Essential Non Functional Requirements

DevFeed: [Essential Non Functional Requirements](<https://devfeed.tech/articles/essential-non-functional-requirements-34676.md>)

Original publisher: [Read original article](<https://newsletter.systemdesigncodex.com/p/essential-non-functional-requirements>)

Author: Saurabh Dashora

Published: 2026-07-07T08:33:34Z

Content type: tutorial

Language: en

Sources: [System Design Codex](<https://devfeed.tech/sources/system-design-codex.md>)

Topics: [Requirements](<https://devfeed.tech/topics/requirements.md>), [Architecture & Design](<https://devfeed.tech/topics/architecture-design.md>), [Scalability](<https://devfeed.tech/topics/scalability.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [Latency](<https://devfeed.tech/topics/latency.md>), [reliability](<https://devfeed.tech/topics/reliability.md>), [Replication](<https://devfeed.tech/topics/replication.md>), [Users](<https://devfeed.tech/topics/users.md>)

Tags: [availability](<https://devfeed.tech/tags/availability.md>), [data-replication](<https://devfeed.tech/tags/data-replication.md>), [failover](<https://devfeed.tech/tags/failover.md>), [haproxy](<https://devfeed.tech/tags/haproxy.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [latency](<https://devfeed.tech/tags/latency.md>), [nginx](<https://devfeed.tech/tags/nginx.md>), [requirements](<https://devfeed.tech/tags/requirements.md>)

## AI overview

This tutorial explains non-functional requirements as quality attributes that determine how software systems behave under real-world conditions. It covers availability, latency, scalability, and durability, with implementation approaches including load balancers, health checks, failover, CDNs, data replication, horizontal scaling, Kubernetes, and concurrent API design.

## Source excerpt

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