Which Software Architecture Should You Choose? From Monolith to Serverless

If a software developer doesn't understand the evolution of software architecture, it limits technology choices and career growth. This article lists four major architectures and their pros and cons to broaden developers' knowledge.

1. Monolithic Architecture

Monolithic architecture is a basic three-tier structure: front‑end (web/mobile) + business logic layer + database layer, typical of Java Spring MVC or Python Django applications.

Monolithic apps are easy to deploy and test, but as codebases grow they become complex, hard to maintain, and costly. Drawbacks include high complexity, technical debt, low deployment frequency, poor reliability, limited scalability, and hindered innovation.

2. Distributed Application

Distributed applications split the system into multiple business modules deployed on separate servers, with inter‑module communication via interfaces. Databases are also distributed (e.g., Redis, Elasticsearch). Load balancers like LVS/Nginx distribute requests.

Advantages: reduced coupling, clear responsibilities, easy expansion, flexible deployment, and higher code reuse. Disadvantage: remote communication adds development effort.

3. Microservice Architecture

Microservices decompose the system into many small services, each focusing on a specific business function. They can be deployed on different servers or containers. Frameworks include Spring Cloud and Dubbo.

Benefits: easier development and maintenance, fast startup, localized deployment, and technology‑stack flexibility. Challenges: higher operational overhead, inherent distributed complexity, API change costs, and potential code duplication.

4. Serverless Architecture

Serverless lets developers focus on business logic while the platform handles compute resources, billing per invocation. Major providers include AWS Lambda, Google Firebase, and Parse.

Advantages: low operational cost, simplified maintenance, improved maintainability, and faster development. Drawbacks: vendor lock‑in and limited mature use cases.

Currently, microservices dominate, but serverless is emerging as the next trend.