Senior Backend Engineer (Kajo)

About the role

Rivero, a Swiss fintech founded in 2019 and a Visa partner, builds SaaS solutions for fraud recovery, dispute management and payment scheme compliance. It is hiring a Senior Backend Engineer for its Kajo project, a distributed application built on event sourcing that supports customers and internal scheme compliance experts. The team is small and product-focused.

Key responsibilities

• Expand the current functionality of Kajo with new features and improvements.
• Maintain the existing codebase, identify pain points and suggest solutions.
• Develop tools that help internal users manage their operational workload.
• Lead the design and implementation of new parts of the stack as product requirements grow.
• Use AI coding tools as a core part of daily work and help the team use them better.
• Pick up occasional frontend tickets or end-to-end tasks alongside backend work.
• Share knowledge and enable fellow engineers.

Required profile

• Mainly writes Kotlin; non-Kotlin developers can apply if they know another JVM language, have exceptional expertise in a modern backend language, can learn Kotlin quickly, or enjoy a technical challenge in Kotlin.
• Experience with distributed web applications, relational databases and designing application APIs.
• Regular hands-on use of AI coding tools and willingness to work outside a strict backend scope.
• Attention to detail and edge cases, effective communication, and comfort in an AI-assisted workflow.

Required skills

• Kotlin (main language); also Go, Java, Scala, Rust, Haskell, TypeScript, Vue.js, GraphQL, jOOQ, Flyway, PostgreSQL, NATS, Keycloak, Docker, Kubernetes, Terraform, GitLab CI, Prometheus, Vault, Google Cloud Platform, Nix.
• Nice to have: event sourcing, CQRS, Go, and infrastructure/DevOps tooling.

What we offer

• Work from a historic building near Oerlikon station or co-working spaces in selected locations.
• Academy sessions, social events and bi-annual on-site events in Zurich.
• Five extra days of holiday and a dog-friendly office.
• Mobile allowance, flexible tech set-up and stock options.
• Remote candidates in a timezone reasonably aligned with Zurich are welcome.