What is a Back-End Developer?

The developer is the new digital craftsperson. Brick by brick, they design and code the applications, websites, and software we now use every day.

A few years ago, this was still a UFO of a role, kept in some corner of the company, called the "webmaster" or "computer engineer" - the one who knew how computers worked but whose use was so limited that little importance was given to it.

Today, they are a true tech rock star, fought over at the highest prices, because they bring know-how that's essential to any innovative, forward-looking company: digital, the web… tech, basically.

Job profile last updated on 09/06/2026.

What is their role?

Walk through a typical week with the various tasks this role will perform, without going into specific issues.

Just as a construction company needs skilled and compliant tradespeople to put up a structure, a tech company (or one whose business relies on a tech solution) needs back-end developers to code everything that's invisible: the back office.

We often refer to software craftsmanship as a qualitative, durable approach to development as opposed to "Quick & Dirty," or to software architecture.

Why do companies need a Back-end developer?

Any company looking to deliver an IT project that communicates with databases and servers faces back-end issues.

They therefore need skills to code and develop a technical solution based on a programming language: an application, software, a website, an intranet, an extranet, a platform…

Their impact on the business will vary based on how much the company depends on tech.

A tech company developing software or a web app such as a marketplace platform (PaaS) or online software (SaaS), or a non-tech company whose business relies on a tech solution (an e-commerce site), will critically depend on the back-end profiles hired internally (among other tech profiles).

The success and growth of the business are therefore highly correlated to its ability to hire these profiles quickly and well, in order to develop the solution rapidly and deliver value.

Day-to-day responsibilities

The back-end developer has several responsibilities in the development of a project.

• Develop new features by sending the requested information back to front-end requests.
• Manage the relationship with the databases.
• Set up the back-end architecture for features.
• Write tests that meet the user's functional needs.
• Optimize old code building blocks.

Team collaboration

At the center of the company's technical issues, back-end profiles can work with all members of the tech team dealing with back-office issues:

• Product Owner: frames and prioritizes the back-end developer's work by translating business problems into technical problems.
• Data Analyst & Scientist: depending on the company's orientation and the influence of data on the business.
• DevOps & Infrastructure Lead: provides them with a technical work environment that allows them to optimize and automate their day-to-day work.
• CTO / Lead dev: in a hierarchical and management role.

What kinds of problems does a Back-end developer tackle?

The technical problems solved by back-end developers are many, and depend on the company's sector. Here are a few among many others:

• Load issues: a site's ability to handle huge, brief traffic spikes such as Black Friday for an e-commerce site/marketplace, food delivery services at lunch and dinner, or event ticket sales sites.
• Payment and transactions: managing the security and reliability of online payments.****
• Security: ensuring the reliability and security of a site against attacks or intrusion attempts by detecting potential vulnerabilities.****
• Back-end architecture
• Performance: common to most websites - ensuring fast execution under all circumstances, providing a good user experience.****
• Migration to a new language/framework: after a strategic and technical decision to migrate an application to a more suitable language and/or framework. This may be due to the pros/cons of a language/framework versus the application's needs, to simplify hiring by switching to a more widely used language, to make it easier for the team to ramp up, etc.

To return to the construction analogy, the back-end developer can choose to stay versatile by mastering the basics of several issues (like a general tradesperson capable of building a house from A to Z).

Or they can choose to become an expert by specializing in a domain of the back-end (like a tradesperson specialized in framing, masonry, or plumbing).

Technologies & platforms used

Back-end technologies are too numerous to list, but they can be tied to a technical environment such as the framework or be independent.

They are usable with all back-end languages, like languages communicating with databases. Here are a few examples of back-end languages:

• Java and its frameworks: Spring, Spark, Hibernate, or Struts
• PHP and its frameworks: Symfony, Laravel, Zend
• Python and its frameworks: Django, Pyramid, or Flask
• Ruby and its unmovable Rails for the famous RubyOnRails (ROR)
• C#, the language commercialized by Microsoft, with its main framework .Net
• Go, the language developed by Google
• NodeJS, which isn't really a back-end language but rather a development platform based on the front-end language JavaScript to do back-end. ExpressJS can be used as a NodeJS framework.

For database management, they use:

• SQL
• MySQL
• SQLite
• PostgreSQL
• MongoDB (NoSQL)

Other resources and tools used:

• NginX
• Heroku
• Apache
• Git + Github

What training is needed to become a back-end developer?

Several options are open to you to become a back-end developer. Either you are self-taught, or you follow a training program:

• Engineering or computer science school like Epitech
• A university curriculum in computer science
• Bootcamp

What is a back-end developer's salary?

A junior profile can start their career at €35K gross per year and end at €70K.

• Junior: €35 – €48K
• Confirmed: €45 – €58K
• Senior: €55 – €70K.

How can a back-end developer's career progress?

With the skills acquired, the back-end developer can move into roles such as:

• Tech Expert (on one or several issues)
• Lead Developer
• Engineering Manager.

Discover related job profiles in back-end development:

• Product Owner
• Data Analyst
• DevOps.

Are you a technical professional looking to discover new career opportunities? Don't miss our latest job openings.

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FAQ about the Back-End Developer role

What is the difference between a Back-End Developer and a Full-Stack Developer?

A Back-End Developer specialises in the server side of an application: APIs, databases, business logic, security, and server-side performance. A Full-Stack Developer covers both back-end and front-end (user interfaces). A senior Back-End Developer typically has deeper expertise in server architecture, scalability, and security. A Full-Stack Developer is more versatile but less specialised in each layer.

Which languages should a Back-End Developer master in 2026?

The most in-demand on the French market: Python (data, AI, APIs), Node.js/TypeScript (performant APIs, SaaS), Java/Spring Boot (large enterprises, fintech), Go (infrastructure, high performance), PHP/Symfony or Laravel (still very present in SMBs and e-commerce). SQL proficiency is universal. The 2026 trend: TypeScript on Node.js and Python for AI APIs dominate scale-up job listings.

What is a Back-End Developer's salary in France in 2026?

A junior Back-End Developer earns between €35,000 and €48,000 gross per year. A confirmed profile reaches €45,000 to €58,000. A senior exceeds €55,000 to €70,000. Profiles specialised in performance, distributed architecture, or application security can negotiate higher salaries, particularly in scale-ups and fintechs.

What training leads to a Back-End Developer career?

Classic paths: engineering or computer science school (Epitech, 42, INSA, Polytech), a bachelor's/master's in computer science at university, or an intensive bootcamp (Le Wagon, Wild Code School, Jedha). A self-taught path is possible with a solid portfolio of personal projects on GitHub. Professional experience quickly outweighs the degree: a developer with 2-3 years on a modern stack will be assessed on their code, not their background.

How is the Back-End Developer role evolving with microservices architectures?

The monolith is giving way to microservices in most scale-ups: the Back-End Developer must now master REST and GraphQL APIs, message brokers (Kafka, RabbitMQ), resilience patterns (circuit breaker, retry), and containerisation (Docker, Kubernetes). The boundary with DevOps is blurring — a strong Back-End Developer knows how to deploy and operate their services in production.

What is the difference between a junior and senior Back-End Developer?

A junior masters the basics of a language and framework, can write CRUD APIs, and interact with a database. A senior designs the architecture end-to-end, anticipates scalability issues, optimises performance (indexes, caching, lazy loading), masters design patterns (DDD, CQRS, event sourcing), and can mentor a team. Seniority also shows in the ability to defend technical choices and refuse dangerous shortcuts.

What DevOps tools should a Back-End Developer know?

The minimum expected in 2026: Git (advanced proficiency with rebase, cherry-pick), Docker (building and optimising images), a CI/CD tool (GitHub Actions, GitLab CI), and the basics of a cloud provider (AWS, GCP, or Azure — deploying an API, configuring a load balancer, reading CloudWatch logs). Kubernetes is a plus. The "you build it, you run it" culture is spreading: Back-End Developers are often on-call for their own services.

How does a Back-End Developer approach application security?

Non-negotiable best practices: validating and sanitising all user input (protection against SQL injection, XSS, SSRF), robust authentication (JWT, OAuth2, secure sessions), managing secrets outside the code (environment variables, Vault, secrets managers), HTTPS everywhere, rate limiting, and audit logs. Senior Back-End Developers know the OWASP Top 10 and integrate security from the design phase (shift-left security) rather than as an afterthought.