DRY and KISS: Get rid of unnecessary things

DRY (Don’t Repeat Yourself) – don’t duplicate code, use functions, modules and templates.

KISS (Keep It Simple, Stupid) – the simpler the code, the easier it is to maintain.

Bad: nested if statements and repeating pieces of code.

Good: use early return, classes and reusable components.

Clean architecture: separate logic

Separate the code into layers:

Controllers – request processing

Services – business logic

Repositories – working with the database

SOLID and DDD principles will help you build a clear architecture.

Performance optimization: asynchronicity and databases

Working with APIs, files and databases should be asynchronous!

In Python – asyncio, multiprocessing

In JS – async/await

In Java – CompletableFuture

DB optimization:

Use indexes

Analyze queries (EXPLAIN ANALYZE)

Minimize the number of SQL queries

Code Review and style automation

Code review is not just a bug search, but an improvement in readability!

Comment not only on errors, but also on architectural decisions

Use linters (ESLint, Black, Pylint, Prettier)

Configure pre-commit hooks for automatic code checking.

Testing is not an option, but a necessity

Good code can be tested

Minimal stack:

Jest (JS)

PyTest (Python)

JUnit (Java)

80% test coverage reduces bug fixing by 2 times!

CI/CD and deployment automation

Set up CI/CD (GitHub Actions, GitLab CI, Jenkins)

Automate testing before deployment

Use Docker and Kubernetes

Less manual actions = fewer errors in production.

Documentation of code and processes

The larger the project, the more important the documentation.

Write meaningful comments

Create README and Wiki

Use Docstrings and Swagger for API

Rule: if you can't understand your code after a month, it is written poorly.

These 7 techniques will help you write better code:

Clean architecture

Performance and asynchrony

Automation and testing

Readability and documentation

Apply these principles and your code will run faster and be easier to maintain!