N-iX is looking for a Lead/Senior Kotlin Engineer to join our team.Our customer is a fintech company that provides flexible buy-now-pay-later solutions, enabling consumers to split purchases into transparent, interest-free, or interest-based payments. The customer's Platform team is responsible for managing critical services that are essential to the success and sustainability of the organisation. In simple terms, the team handles transactional communication send-outs to customers via email, SMS, and push notifications. These services demand attention to detail, proactive maintenance, and swift response times to ensure seamless operations. The recent high-priority initiatives include re-architecture/platform modernisation, high availability, and internationalisation efforts; these are vital for our organisation's growth and competitiveness in the market. These initiatives require dedicated expertise and resources to execute efficiently and effectively.Main Responsibilities:Design and develop a robust and extensible Kotlin framework and platformWrite clean, maintainable, and efficient code that complies with our coding standardsEnsure the performance, quality, and responsiveness of the framework/platformIdentify and correct bottlenecks and errorsHelp to maintain code quality, organization, and automation.Create and maintain technical documentation for the framework/platformRole Requirements:At least 5 years of proficiency in Kotlin or JavaDeep experience with the Spring Framework Reactive tools experience (Project Reactor)Knowledge of different communication protocols such as REST, GraphQL, gRPCExperience with distributed systemsFamiliarity with tracing, metrics, and monitoring best practicesExperience in creating frameworks and platforms for other developers Proficiency in Maven or similar tools Familiarity with NoSQL databases Very good spoken and written knowledge of the English language (C1)