Job Description:
The API Developer in Toulouse is responsible for designing, building, and maintaining high-performance, secure, and scalable APIs that enable seamless communication between different systems, applications, and services. This role involves working closely with software engineers, architects, and product teams to ensure that APIs meet functional requirements, align with architectural standards, and deliver a consistent developer experience.
The core focus of this position is to create robust and well-documented APIs that integrate smoothly with both internal systems and third-party platforms. The developer will design RESTful or GraphQL endpoints, implement authentication and authorization mechanisms, and ensure data exchange is efficient and reliable. Special attention is given to API versioning, backward compatibility, and error handling to maintain stability for clients consuming the services.
The API Developer will collaborate with frontend and backend teams to define contract-first API specifications, often using tools such as OpenAPI or Swagger. They will also be responsible for writing unit tests, performing integration testing, and monitoring API performance in production environments to proactively identify and resolve bottlenecks.
Security is a critical aspect of the role, requiring the implementation of encryption standards, input validation, and protection against vulnerabilities such as injection attacks or data leaks. The developer will work in an agile environment, participating in sprint planning, code reviews, and daily stand-ups to ensure smooth coordination between all stakeholders.
Additionally, the role may involve building developer portals, creating detailed API documentation, and supporting partner teams in integrating with the APIs. Keeping up with the latest API development trends, frameworks, and tools is vital to ensure that the organization’s integration layer remains modern, reliable, and efficient. Ultimately, the API Developer plays a key role in connecting systems, enabling digital transformation, and delivering value to both internal teams and external partners.
Job Requirement:
The API Developer role requires deep knowledge of API design principles and best practices, with the ability to develop RESTful and/or GraphQL APIs that are intuitive, secure, and maintainable. Proficiency in at least one server-side programming language such as Java, Python, Node.js, or Go is essential for implementing the business logic behind API endpoints.
The developer must be skilled in using API specification tools such as OpenAPI, Swagger, or Postman to design and test APIs before deployment. They should be proficient with data formats like JSON and XML, as well as with protocols and standards including HTTP, HTTPS, and WebSockets.
Security requirements are a major focus, meaning the developer must understand authentication and authorization mechanisms such as OAuth 2.0, JWT, and API key management. They must also implement input validation, rate limiting, and encryption to protect data integrity and confidentiality.
A strong understanding of API lifecycle management is important, including versioning strategies, deprecation processes, and backward compatibility considerations. The developer should also be capable of building comprehensive automated test suites for APIs, covering unit, integration, and performance testing.
Performance optimization skills are key, requiring the ability to design APIs that minimize latency, reduce payload size, and scale effectively under heavy traffic. The developer must be comfortable with using monitoring tools to track API health, performance metrics, and error rates.
Collaboration and communication are vital, as the API Developer will regularly coordinate with frontend developers, backend engineers, and external partners. They must be able to clearly explain API behaviors, provide technical guidance, and produce thorough documentation for end users.
Finally, adaptability is essential, as API technologies and standards evolve quickly. The API Developer must stay up to date with emerging tools, frameworks, and design patterns to ensure that their APIs remain relevant, efficient, and secure, ultimately supporting the organization’s growth and digital strategy.
