API Developer

Altares Dun & Bradstreet Netherlands; Rotterdam; Hybrid; EUR 65,000 - 85,000; Full time

Benefits offered by this job

Competitive salary with an attractive bonus

Hybrid working

Access to a free gym, swimming pool, and sauna

Internal training programs

Social events and outings

Job summary

A dynamic technology firm in Rotterdam seeks an experienced API Developer to design and implement scalable APIs. Responsibilities include developing RESTful APIs, ensuring security and performance, and maintaining documentation. Ideal candidates have over 5 years in API development with strong Java and Spring expertise. The role offers a competitive salary, hybrid working, and access to various employee benefits.

Qualifications

• Minimum 5 years of experience as an API developer.
• Strong proficiency in Java and Spring.
• Experience with asynchronous programming and performance tuning in Java.
• Knowledge of OAuth2, JWT, and other authentication/authorization standards.
• Deep understanding of RESTful API principles, HTTP methods, and best practices.
• Experience working with Docker and cloud platforms (AWS, Azure, GCP).
• Familiarity with database technologies like PostgreSQL and MongoDB.
• Knowledge of API documentation tools.

Responsibilities

• Design and develop RESTful APIs using Spring Boot.
• Ensure API security, scalability, and high availability.
• Implement unit and integration tests to ensure API reliability.
• Optimize API performance and troubleshoot issues.
• Maintain detailed technical documentation.

Skills

Java

Spring

API development

Microservices

Asynchronous programming

OAuth2

SQL databases

NoSQL databases

Docker

Kubernetes

CI/CD

Git

OpenAPI/Swagger

Job description

Overview

We are seeking an experienced API Developer with strong expertise in Java and Spring Boot to design and implement robust, scalable, and secure APIs. The ideal candidate will have a solid understanding of API development best practices, microservices architecture, and performance optimization. Reporting to the Head of Data, you will be part of a team of Developers and Data Engineers that work closely with our delivery team to create a scalable and performant data accessibility platform.

Responsibilities

• Design, develop, and maintain RESTful APIs using Spring Boot and tools like Restdocs or Springdoc.
• Ensure API security, scalability, and high availability.
• Implement unit and integration tests to ensure API reliability and performance.
• Optimize API performance and troubleshoot production issues.
• Maintain detailed technical documentation for API endpoints and usage.
• Work with containerization and deployment tools for smooth API delivery.

Qualifications

• Minimum 5 years of experience as an API developer;
• Strong proficiency in Java and Spring;
• Experience with asynchronous programming and performance tuning in Java;
• Knowledge of OAuth2, JWT, and other authentication/authorization standards;
• Deep understanding of RESTful API principles, HTTP methods, and best practices;
• Experience working with containerization (Docker, Kubernetes), and cloud platforms (AWS, Azure, GCP);
• Familiarity with SQL and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB);
• Familiarity with CI/CD pipelines, version control (Git), and automated testing;
• Knowledge of API documentation tools like OpenAPI/Swagger.

Nice-to-Have Skills

• Experience with GraphQL or gRPC;
• Familiarity with microservices architecture and service orchestration;
• Familiarity with API platforms, such as KONG;
• Understanding of event-driven systems using Kafka, RabbitMQ, or similar tools;
• Basic knowledge of DevOps practices and infrastructure-as-code tools (Terraform, Ansible).

Key Qualities

• Strong problem-solving and analytical thinking;
• Excellent collaboration skills and ability to work in technical and cross-functional teams;
• Ability to work independently and manage multiple priorities;
• Motivated to learn and embrace new technologies;
• Fluent in English (spoken and written) mandatory.

What Altares – Dun & Bradstreet offers you

Alongside an informal, educational, and dynamic work environment, we also offer:

• Competitive salary with an attractive bonus;
• Hybrid working: partly at the office, partly at your favorite home workspace;
• Working in a data-driven and innovative company;
• A modern office in an iconic location in the heart of Rotterdam;
• Access to a free gym, swimming pool, and sauna;
• An incredibly fun and professional team where you can continue to grow;
• Access to LinkedIn Learning and internal training programs;
• Our “Fun & Bradstreet” events committee regularly organizes drinks, sports events, and other fun team outings.

Are you already interested in the API Developer position? Apply as soon as possible and don’t forget to include your motivation letter!

If you have any questions about this vacancy, let us know!

Altares Dun & Bradstreet does not accept unsolicited CVs from external recruiters.

Details

• Seniority level: Mid-Senior level
• Employment type: Full-time
• Job function: Information Technology
• Industries: Technology, Information and Internet