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Serverless Architectures: Pros and Cons

Serverless computing abstracts server management and lets developers focus purely on code. Popular offerings like AWS Lambda, Azure Functions, and Google Cloud Functions allow applications to scale automatically while reducing operational overhead.

Further reading: AWS Serverless Overview

The Benefits

• Cost efficiency at low-to-moderate traffic — you pay per invocation rather than for idle server time.
• Automatic scaling — the platform handles scaling up and down without capacity planning.
• Reduced operational surface — no OS patching, no server fleet to monitor, less infrastructure to reason about.

The Drawbacks

• Cold starts — infrequently invoked functions can add hundreds of milliseconds to latency-sensitive requests.
• Debugging difficulty — distributed, ephemeral execution makes local reproduction and tracing across functions harder than with a traditional server.
• Vendor lock-in — serverless platforms are deeply tied to a provider's ecosystem, making migration between clouds nontrivial.
• Execution limits — most platforms cap execution time and memory, which rules out long-running or resource-intensive workloads.

When Serverless Fits

Serverless is a strong fit for spiky or unpredictable traffic, event-driven glue logic between services, and teams that want to minimize operational burden. It's a weaker fit for steady, high-throughput workloads where a right-sized always-on server is cheaper, or for latency-critical paths that can't tolerate cold starts.

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