Senior Backend Engineer - Kotlin, Spring Boot

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Senior Backend Engineer role to design, build, and operate secure, scalable microservices for an e-banking platform using Kotlin and Spring Boot. Responsibilities include developing backend services and APIs, managing event-driven integrations with Apache Kafka, owning data models and schema migrations in PostgreSQL and MySQL, integrating with CI/CD and DevOps tools on OpenShift/Kubernetes, applying security best practices (OAuth2/OIDC), conducting code reviews, mentoring junior engineers, and producing technical documentation. Requires 5+ years backend experience, proficiency in Kotlin, Spring Boot, Apache Kafka, PostgreSQL, MySQL, Kubernetes/OpenShift, OAuth2/OIDC, Git, CI/CD, and German B2+ with business-level English. Benefits include holidays, wellness days, flexible hours, home office, learning allowances, and more. Location: St Gallen, Switzerland. Hybrid work model.