What is a Full-Stack Developer

Role and responsibilities of the full-stack developer

The full-stack developer designs, develops, and maintains applications end to end, often in an agile environment.
Their goal: make a complete product work, from the user's click to the database.

Their core responsibilities:

• Design the technical architecture of a web or mobile application.
• Develop user interfaces in React, Vue, Angular, or equivalent.
• Implement server-side logic (API, database, security, authentication).
• Ensure communication between front and back.
• Set up dev, test, and deployment environments.
• Contribute to the scalability and maintainability of the product.
• Work hand in hand with designers, PMs, and other developers.

They are often the profile closest to the product: they understand functional needs as much as technical constraints.

Technical skills

The full-stack developer is a generalist, but with real technical rigor.
Their knowledge spans several domains:

Front-end:

• HTML5, CSS3, JavaScript (ES6+), TypeScript
• Frameworks: React, Vue.js, Angular

Back-end:

• Node.js, Python (Django, FastAPI), Java (Spring), Ruby on Rails, PHP (Symfony, Laravel)
• REST / GraphQL APIs
• SQL databases (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis)

Other skills:

• Git, CI/CD, Docker
• Cloud (AWS, GCP, Azure)
• Unit / integration tests
• Application security and performance

💡 Full-stack ≠ doing everything alone.
It's mainly the ability to understand each layer of a product and collaborate effectively with specialists in each domain.

Key soft skills

• Autonomy: able to move forward without constant supervision.
• Curiosity: continuously upskilling on new stacks.
• Pragmatism: prioritizing what serves the product, not technical complexity.
• Communication: explaining tech topics simply to product teams.
• Team spirit: understanding the constraints of other roles (design, product, business).

Training

• Engineering schools, specialized web development training, or self-taught paths.
• Many full-stack developers come from front-end or back-end before diversifying.
• Bootcamps can also produce excellent profiles when complemented with real project experience.

Full-stack developer salary

• Junior (0-2 years): €38K – €45K
• Confirmed (3-5 years): €45K – €60K
• Senior (6+ years): €60K – €75K
• Lead / Principal: €75K – €90K+ depending on the size and maturity of the company

Possible career progression

• Tech Lead / Lead Developer
• Engineering Manager
• Software Architect
• CTO of an early-stage startup
• Or specialization: front-end, back-end, data, devops, depending on interests.