AWS Lambda Architecture: Single vs. Multiple Functions

When building serverless applications, one of the most critical decisions is whether to group your logic into a single Lambda function or split it across multiple micro-functions. Making the wrong choice can lead to high cold-start latencies, security vulnerabilities, and unexpected cloud bills. This text-based course guides you through the architectural decision-making process, helping you balance performance, deployment speed, and operational effort so you can design clean, efficient, and secure serverless backends. What you'll learn: - Understand the core architectural trade-offs between monolithic functions and granular micro-functions. - Analyze how function size and granularity impact execution times, cold starts, and AWS billing. - Apply security best practices by defining specific IAM roles to enforce the principle of least privilege. - Design scalable APIs by mapping API Gateway configurations to optimized Lambda execution patterns. - Evaluate maintenance overhead, deployment strategies, and modern observability workflows for serverless systems. We begin with foundational serverless concepts and basic Lambda execution mechanics. From there, you will explore real-world design scenarios, comparing the performance, security, and cost implications of both patterns through clear, structured text explanations and architectural breakdowns. This course is designed for software developers, cloud hobbyists, and aspiring system architects who are new to serverless design. No prior advanced cloud engineering experience is required. Start reading today to build efficient and scalable serverless applications with confidence.