What is a Serverless Application - Understanding Cloud Computing Evolution

What is a Serverless Application: Understanding Cloud Computing Evolution

Serverless computing marks a significant shift in the way developers deploy and manage applications. It’s a model that abstracts away the complexity of server management, providing a platform where code execution is completely managed by the cloud service provider. This approach allows developers to concentrate on writing their applications, while the provisioning, scaling, and maintenance of servers are handled automatically. The technology empowers businesses by streamlining development processes and minimizing infrastructure costs, promising a more efficient deployment pipeline.

Understanding serverless architecture is pivotal for modern software development. Although the term “serverless” might imply the absence of servers, it simply signifies that developers no longer need to be concerned about server operations. This computing model is quickly becoming crucial for companies aiming to accelerate their digital transformation, driving innovation without the overhead of traditional server management. Serverless computing involves various components and services that can dynamically scale to meet application demands, ensuring developers can deliver applications quickly and more reliably.

What Does Serverless Mean

With serverless computing, developers are spared from the tasks of provisioning or managing infrastructure. Instead, the cloud provider takes on the responsibility of managing servers, containers, and operating systems. This model is designed for cost-effectiveness with pay-as-you-go billing, where charges are based on the actual use of resources without any required upfront commitment.

Key features of serverless computing include:

  • Automatic scaling: Resources are dynamically allocated based on demand.
  • No operations to manage: Enterprises can focus entirely on application development.
  • Enhanced security: Patching and security are managed by the cloud provider, reducing the workload of in-house IT teams.
  • Speed and agility: Products can be brought to market swiftly and adapted quickly.
  • Cost efficiency: Operational costs are aligned with business growth, ensuring that expenses stay proportional to usage.
Serverless computing - Features

What Is Serverless Computing

In the realm of cloud computing, serverless computing stands out by eliminating the need for developers to manage physical servers. It operates under a Function-as-a-Service (FaaS) model where the cloud service provider abstracts the server management, allowing developers to focus solely on writing code.

Here’s a structured look at serverless computing characteristics:

  • Evolution of Infrastructure: Severs are still integral, but developers are no longer burdened by the intricacies of server management, which a cloud provider orchestrates.
  • Key Offerings: Major market players offer serverless platforms:
Serverless computing - Technology

Function as a Service revolves around:

  • Execution of code in ephemeral runtimes.
  • Small-scale code, typically a few functions.

Event-driven: Triggers include:

  • HTTP requests
  • DB events
  • Queue messages
  • Monitoring alerts
  • Scheduled events

Serverless computing is not confined to FaaS. It spans a broader spectrum, encompassing additional services tailored to streamline deployment and scalability without the traditional server constraints.

What Is Serverless Computing In AWS


Serverless computing - AWS Lambda

AWS Lambda allows the execution of code without server management. It supports precise billing down to 100 ms and charges for compute time used. AWS Lambda can natively integrate with over 200 AWS services to create event-driven applications with minimal operational overhead.


Serverless Storage - S3, EFS

Amazon S3 offers secure and scalable object storage accessible via CLI or web interface. AWS Lambda can also utilize EFS for Serverless applications, enabling larger codebases and libraries to be incorporated despite AWS Lambda’s size limitations.


Serverless Databases - DynamoDB, RDS Proxy, Aurora Serverless

Serverless options like DynamoDB provide a NoSQL database with low latency, appropriate for scalable applications. Amazon Aurora Serverless offers an auto-scaling configuration, and Amazon RDS Proxy improves scalability and security for relational databases, efficiently managing concurrent connections.

API Gateway

Serverless computing - API Gateway

Amazon API Gateway facilitates developers in creating, publishing, managing, and securing APIs of varying scales, streamlining the API management process.

Application Integration

Serverless Application Integration - SNS, SQS, AppSync, EventBridge

Services such as Amazon SNS and Amazon SQS support decoupling and scaling through managed messaging, while AWS AppSync offers simplified API creation using GraphQL. Furthermore, Amazon EventBridge streamlines the routing of events from applications to AWS services.


Serverless WorkFlow Orchestration - Step Functions

AWS Step Functions orchestrates distributed applications and microservices, providing a visual workflow representation by creating state machines which define transition paths in JSON format.


Serverless Analytics - Kinesis, Athena

For streaming large datasets, Amazon Kinesis facilitates real-time data analytics. Amazon Athena, conversely, is an interactive service allowing SQL queries on data stored in Amazon S3 in conjunction with AWS Glue for data cataloging.

What Is Serverless Architecture

Serverless architecture allows building and scaling applications by using cloud-managed services such as serverless databases and file systems. This architecture abstracts server management and provisioning, handled by the cloud provider, enabling developers to focus on code and business logic.

Key Components:

  • Auto-scaling: Dynamically adjusts resources to match demand.
  • Managed Resources: Cloud services like databases and storage.
  • Cloud Providers: Offer backend services, maintaining infrastructure.
Serverless Website Architecture

What Is A Serverless Application

Why Create Serverless Apps

Serverless applications are built on a development model that abstracts server management away from the developer, allowing them to concentrate solely on writing business logic. This architecture presents numerous advantages:

  • Zero Operations: Traditional server maintenance tasks, such as patching, scaling, and securing, are handled by the cloud provider, freeing developers from infrastructure concerns.
  • Automatic Scalability: Applications scale automatically with demand. Developers need not provision resources in advance, as the system dynamically adjusts to handle workloads.
  • Cost-Effectiveness: With serverless computing, costs are directly tied to usage. You only pay for the time when your functions are running, often at a millisecond granularity, resulting in potentially lower costs.
  • Event-Driven Workflows: Serverless apps excel in an event-driven environment, promptly responding to events and triggers without idle infrastructure.
  • Simplified Backend Services: For frontend developers, serverless environments offer simplified backend services creation, enabling easy integration with databases, storage, and other cloud services.

Companies leverage serverless architectures for business process automation and deploying workloads without getting involved in the underlying infrastructure intricacies. The approach suits various scenarios, such as handling web requests, processing streams of data, and integrating with IoT systems (as demonstrated in the illustration).

Serverless Application Architecture

While serverless computing can be powerful and cost-efficient, it’s essential to follow Security Best Practices For Serverless Applications to mitigate risks inherent to remote code execution and third-party services management. By adopting serverless architecture’s best practices, developers can streamline the app development process and strategically focus on delivering value through their software solutions.

What is AWS Lambda

Serverless computing - AWS Lambda

Benefits of AWS Lambda.

Serverless computing - Benefits

Benefits of AWS Lambda

  • Server Management: AWS Lambda eliminates the need to manage servers, offering a hands-off experience where AWS executes your code.
  • Cost Efficiency: With granular billing, AWS Lambda proves to be cost-effective as you pay only for the compute time you consume.
  • Performance: By selecting the appropriate memory size for your functions and enabling Provisioned Concurrency, AWS Lambda delivers consistent performance.
  • Load Balancing: AWS automatically manages the distribution of incoming requests across your Lambda functions.
  • Scaling: AWS Lambda scales automatically, running more functions as needed based on the number and rate of incoming requests.
  • Reliability: AWS Lambda’s built-in retry logic helps to manage failures during request processing.
  • Isolation: AWS ensures that each Lambda function’s compute and memory resources are isolated from others for security.
  • Maintenance: AWS takes care of the underlying operating system’s patching and general maintenance, freeing developers from these tasks.

Supported runtime environments and additional features such as aliases and versions further enhance the capabilities of AWS Lambda, allowing for smooth code upgrades and traffic-shifting strategies.

Anatomy Of The Lambda Function

Lambda Function Structure
  • Handler Function: The designated function within AWS Lambda that is invoked in response to an event or a call.
  • Event Object: This data structure contains information about the event that triggered the Lambda function.
  • Context Object: Offers methods to access runtime information, enabling the function to interact with the AWS Lambda environment.

The remainder of the Lambda function is composed of the necessary library imports and the actual business logic that the function is meant to execute. Together, these elements define the operational framework of a Lambda function, governing how it responds to events and processes requests.

Lambda Function Execution Methods

Direct Invocation

Lambda functions can be triggered directly using the AWS Lambda API, which allows users to pass a payload to the function. This method is consistent across different interfaces, including the web console, CLI tools, and other AWS services.

Synchronous (push)

When using Lambda with AWS API Gateway, the function is invoked synchronously. The connection is maintained until Lambda completes processing the request, which is ideal for real-time HTTP request handling.

Asynchronous (event)

Lambda can be configured to handle event-based triggers from AWS services like SNS or S3. In this case, the function is invoked but doesn’t wait for the execution to finish, which suits scenarios where immediate response is not required.

Stream (poll-based)

For services like DynamoDB or Kinesis, Lambda functions can poll for data changes and process records in batches. This method is efficient for handling stream-based data workflows.

Serverless Frameworks

Developers seeking to navigate the complexity of serverless architecture have a selection of frameworks to choose from, aiming to streamline development processes and reduce maintenance overhead.

  • Apex Up simplifies deployment and integrates natively with AWS Lambda.
  • Apache OpenWhisk operates across multiple platforms and lends itself well to microservices architectures.
  • AWS Amplify Framework excels in building full-stack applications with real-time updates and offline functionality.
  • Claudia.js streamlines deployments to AWS, helping manage API Gateway and Lambda functions effectively.
  • Middy offers a middleware engine for AWS Lambda to enhance the modularity of serverless applications.
  • Nuclio is designed to alleviate vendor lock-in, providing high-speed functions with a focus on real-time data processing.
  • Pulumi brings infrastructure as code to the serverless realm, integrating well with cloud services and Kubernetes.
  • Ruby on Jets brings serverless capabilities to Ruby developers, allowing the ease of managing serverless applications in a familiar environment.
  • Serverless Framework is widely recognized for setting the stage in abstracting infrastructure management to focus on coding.
  • SLAppForge Sigma aids in the building of applications with drag-and-drop capabilities and supports multiple cloud providers.
  • Zappa makes it easy to deploy Python WSGI applications on AWS Lambda and API Gateway.

The choice of framework can significantly dictate the ease of deployment, management, and scalability of serverless applications, with some offering more flexibility and others providing deep integration with specific serverless platforms.

AWS Lambda Use Cases

Web Apps

AWS Lambda integrates seamlessly with API Gateway, making it an optimal solution for static and complex websites. This combo allows for scalable, serverless web applications that can handle a wide range of workflows.


Lambda is widely used to power various backend systems, from mobile and Internet of Things (IoT) applications to service-oriented architectures. Its ability to run code on demand simplifies backend infrastructure maintenance.

Data Processing

Lambda functions can trigger on data change events, making it a go-to resource for data processing tasks such as ingestion and transformation. Common integrations include AWS services like S3, DynamoDB, Kinesis, SNS, and CloudWatch, offering wide-ranging serverless solutions.

Real Time Ingested Data Transformation

Chatbots & Amazon Alexa

Developers often use Lambda to build chatbots and Alexa skills, leveraging its ability to run code in response to voice commands and providing a seamless cloud-based environment for voice-powered applications.

Create Alexa Skills

Real-Time Stream Processing

Lambda is adept at handling real-time stream processing tasks, like application activity monitoring, transaction processing, and social media analytics. It integrates with Kinesis to process and analyze high-velocity data streams for analytics and batch processing.

Fan out Ingested data Stream To Multiple Destinations

IT Automation

Serverless CRON Jobs

For IT automation, Lambda addresses needs ranging from Cloud CRON jobs to policy enforcement engines. It simplifies infrastructure automation, management, and governance through serverless operation.

Lambda Pricing Model

  • On-Demand Execution: Pay only for what you use with no upfront fees or minimum charges.
  • Scalability: Automatic scaling adjusts to workload changes with high availability.
  • Cost-Effective: Incremental charges based on 100ms compute time increments.
  • Free Tier: Monthly allowance of 1M requests and 400,000 GB-seconds.

Pricing Elements:

  • Requests: Charged per 1M requests after the free tier is exceeded.
  • Compute: Costs based on consumed GB-seconds, with automatic scaling to efficiently manage capacity.

Fault Tolerance: AWS Lambda ensures fault-tolerant function execution, handling capacity management without manual intervention.

For detailed figures, view and explore the free tier benefits.

Choose AWS Lambda Size And Price

Lambda Permissions Model

  • Function Policy: Defines who can invoke the Lambda function.
  • Execution Role: Governs actions the function can perform during execution.

Proper configuration ensures security, enabling safe monitoring and patching practices.

What is Microsoft Azure Function

Microsoft Azure offers Azure Functions, a serverless compute service that enables efficient application development. It operates on an event-driven basis, providing on-demand execution of code in response to various triggers. Azure Functions facilitates a simplified approach to application development, focusing on essential business logic without the need to manage hardware intricacies.

  • Function App: Functions as both an API Gateway and a serverless compute resource, akin to AWS Lambda.
  • Logic App: Manages and processes events based on triggers and workflows.

Users can leverage Azure Functions to respond to events within the Azure ecosystem. Development flexibility is advanced with support for multiple programming languages and runtime versions:

LanguageSupported Runtimes
C#1.x, 2.x, 3.x
Node.js6, 8, 10, 11, 12
F#.Net 4.7, Core 2.2, 3.1
Java8, 11
PowerShell6, 7
Python3.6, 3.7, 3.8
CustomCustom Environments

Azure Functions empowers developers to build applications that integrate easily with various services and handle complex orchestrations, promoting a streamlined development process.

What is Google Cloud Function

Google Cloud Functions is a platform that executes code in response to events, a key component of the serverless paradigm. It allows the creation of single-purpose, stand-alone functions that operate on a variety of triggers such as HTTP requests, Pub/Sub messages, and changes in Cloud Storage or Firestore.

Key Features:

  • Event-driven: Trigger functions via events from Google Cloud or third-party services.
  • Integration: Full integration with Cloud Monitoring, Cloud Trace, and Cloud Debugger for efficient debugging.
  • Pay-per-use: Costs are calculated based on the actual execution time of functions.
  • Runtime support: Includes Node.js, Python, Java, and Go.

Triggers Available:

  • HTTP requests
  • Pub/Sub messages
  • Cloud Storage changes
  • Firestore events
  • Firebase events
  • Cloud Monitor alerts

Use Cases:

  • Executing back-end code in response to HTTP calls without provisioning servers.
  • Processing data in response to changes in cloud storage.
  • Automating responses to various system events.

With Google Cloud Functions, developers can build scalable applications that react to changes in the ecosystem and process information in real time. This serverless compute solution fosters agility and enables teams to deploy code that automatically scales with demand.


Serverless computing enhances DevOps strategies by promoting agility and reducing time to market. Teams can focus more on creating value, hence boosting productivity through automated resource management. It supports organizational transformation with cost-effective, scalable solutions.

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