Fullstack: What It Is, Technologies and Key Tasks

What is a Fullstack Developer?

A fullstack developer is a specialist who works with both the client-side and server-side of an application. They can write a React interface, create an API with Node.js, design a PostgreSQL database, and set up deployment with Docker.

Origin of the Term

The term fullstack emerged in the mid-2010s when web development split into frontend and backend. Companies needed developers who understood both sides, especially in the early stages of projects. Today, fullstack is not just knowledge of two areas but the ability to design the entire architecture.

Fullstack Levels

Junior fullstack usually knows the basics of frontend and backend but lacks deep knowledge. Senior fullstack is a rare specialist with 5+ years of experience in both areas, capable of making architectural decisions and setting up infrastructure. The average fullstack is often stronger in one domain.

What Technologies Does a Fullstack Use?

A fullstack developer’s tech stack covers several layers: client-side, server-side, databases, and infrastructure. The most popular stack is MERN (MongoDB, Express, React, Node.js).

Frontend: From React to Mobile Frameworks

On the frontend, a fullstack uses React, Next.js for SSR, TypeScript for typing, and Tailwind CSS for styling. For mobile applications, React Native is added. Knowledge of Vue or Angular expands job opportunities across different teams.

Backend: Node.js, Python, and Databases

Node.js with Express or Fastify is the most common choice for fullstack since JavaScript is used on the client as well. Alternatives: Python with Django or FastAPI. Databases are divided into relational (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). A fullstack must know SQL and schema design.

Example of a Simple Express API

const express = require("express");
const app = express();

app.get("/api/users", async (req, res) => {
  const users = await db.query("SELECT * FROM users");
  res.json({ data: users });
});

app.listen(3000, () => console.log("Server running"));

How Does Fullstack Differ from Specialized Roles?

The key difference is breadth versus depth. A fullstack knows a little about everything, a specialist knows one area thoroughly. The choice depends on the project and its stage of development.

Where Fullstack Falls Short

In complex projects, specialization matters more. Developing a high-load backend, complex frontend animations, or configuring Kubernetes requires engineers with 5–10 years of experience in a specific area. A fullstack falls short in depth of understanding in such projects.

Where Fullstack Excels

In startups and at the MVP stage, fullstack is an ideal choice. One developer does everything: interface, logic, database, and deployment. This speeds up development by 2–3 times and reduces costs in the initial phase.

When Do You Need a Fullstack in a Project?

The decision to hire a fullstack depends on team size, budget, and project stage. Fullstack effectiveness changes at different stages.

MVP and Prototyping

For creating a minimum viable product, a fullstack is indispensable. They take a task from idea to working application without handoffs between developers. This reduces time to market by 1.5–2 times.

Legacy Project Support

In maintaining existing applications, a fullstack is useful when you need to both fix bugs in the interface and add new endpoints. Narrow specialization in such conditions slows down work.

Advantages and Disadvantages of the Fullstack Approach

The fullstack approach has strengths and weaknesses that are important to consider both for the developer and the company. Below is a comparison table of the main factors.

Career Risks for Fullstack

The main risk is superficiality. It is difficult for a fullstack developer to compete with senior specialists in a specific area. It is recommended to have one strong side (e.g., React) and a second at a solid middle level. Over time, a fullstack can deepen into architecture and become a technical leader who understands all layers of the system.

How Much Does a Fullstack Earn?

A fullstack salary varies greatly depending on region, stack, and level. In Moscow, a junior fullstack earns from 80,000, middle — 150,000–250,000, senior — from 300,000 rubles. In the regions, salaries are 20–30% lower with the same tech stack.