Senior Back-End Developer (Swedish Ad Platform)

• Implement microservices (billing, reporting, approval) based directly on the OpenAPI specification and BRD logic 
• Write clean, efficient code with a primary focus on strict multi-tenant data separation, authorization, and security 
• Proactively refactor legacy monolithic code into cloud-native microservices, working closely with the Platform Architect 
• Build the secure API infrastructure required to integrate AI model inference into core platform workflows 
• Develop highly testable code (unit, integration) to support the CI/CD pipeline and automated documentation generation 

• At least 7 years of hands-on Back-end development experience 
• Proven experience with OpenAPI/Swagger-defined REST APIs 
• Extensive experience designing, developing, and deploying containerized microservices (e.g., using Java, Node.js) 
• Experience with relational and NoSQL databases optimized for multi-tenant SaaS applications 
• Deep experience with monitoring, distributed tracing, and secure credential management in AWS environments 
• At least an Upper-Intermediate level of English 

WOULD BE A PLUS

• Experience with Go (Golang) for high-performance services 
• Knowledge of building services for high-volume AdTech or FinTech platforms 

PERSONAL PROFILE

• Independent and proactive problem-solver  
• Strong focus on writing clean, secure, and maintainable code  
• Comfortable working in distributed, international teams