Kotlin Developer

About us

Agap2 is a European IT and Engineering Consultancy, active in 14 countries with over 9.500 employees. The company was founded in Portugal and since 2014 we are based in the Netherlands with our Amsterdam office to provide our expertise to the Dutch market. Our employees are defined by the so-called “Agapian spirit”, which is summarized in 5 keywords: family, union, friendship, team spirit, and learning.

Did you identify with what defines us? Then read on to find out more!

The position

As a Kotlin Developer Payments at agap2, you take on the challenge within an international environment with a local focus. You will have the opportunity to work on various projects over the years, based on your experience and interests. Projects within industries such as Banking, Fintech, Telco, Retail, Sports, and Healthcare.

While working at Agap2, you are expected to share your knowledge while also having the opportunity to learn new technologies. We believe that sharing knowledge is the key to personal development. Our talent management program is tailor-made to give you the opportunity to develop and grow in your career, the way you envision it. Because we work with various customers, you are also expected to be able to adapt to different environments.

Key Responsibilities

We are seeking a highly skilled Kotlin Developer Payments with deep expertise in Java , strong professional experience in Kotlin , and a solid background in building scalable, event-driven systems. The ideal candidate is comfortable working in distributed architectures, crafting clear and effective user stories, and ensuring system reliability through robust testing and observability practices.

• Design, develop, and maintain backend services using Java , Kotlin , and Spring Boot .
• Contribute to and optimize event-driven architectures leveraging technologies such as Kafka .
• Translate business requirements into actionable user stories and deliver high-quality technical solutions.
• Build and maintain REST APIs following architectural best practices.
• Work within a microservices architecture , ensuring scalability, reliability, and performance.
• Implement monitoring, logging, and alerting aligned with observability best practices .
• Collaborate on data persistence solutions using PostgreSQL , MongoDB , or similar databases.
• Write high-quality unit and integration tests using frameworks like JUnit , Mockk , and Mockito .

What you bring to the position

• Strong experience with Java , plus 4–5 years of Kotlin experience .
• Solid knowledge of Spring Boot and event-driven design (Kafka or equivalent).
• Deep understanding of asynchronous communication patterns (Kafka, RabbitMQ, message queues).
• Proven ability to draft, refine, and deliver user stories and turn requirements into technical designs.
• Strong understanding of REST API architecture principles .
• Experience working with microservice-based systems .
• Hands-on experience with observability tools (monitoring, logging, alerting).
• Knowledge of PostgreSQL , MongoDB , or similar databases.
• Proficiency in writing unit/integration tests using JUnit, Mockk, Mockito, etc.

Nice-to-Have Requirements

• Experience with high-volume, business-critical systems that require strict resilience.
• Familiarity with designing-for-failure patterns : retries, idempotency, fallbacks, circuit breakers.
• Experience with contract-first REST API development using OpenAPI.
• Ability to debug issues across distributed microservice architectures .
• Understanding of performance testing and experience with Gatling (Kotlin) .
• Basic experience running and debugging services in Kubernetes .

What we offer

• Competitive Salary & Benefits: Including a laptop, mobile phone, full travel allowance and pension plan.
• Work-Life Balance: 25 vacation days, flexible working hours in a hybrid mode.
• Professional Growth: Weekly Dutch classes and a tailored talent management program with a financial budget to help you achieve your professional goals.
• Dynamic Culture: Diverse team activities from tech meetups to sports and social events.

Is there still room for fun? Of course! The combination of fun and development is essential in our team. A small impression: our team consists of more than 10 nationalities, we play paddle and regularly organize tech meetups, happy hours drinks, and pub quizzes.

At agap2 we defend equality and value diversity. We create a safe, diverse environment where opportunities are equal for all employees. All candidates with skills matching the position are welcome to join us!