Senior Backend Engineer in Zürich

About Rivero

Established in 2019 and headquartered in Switzerland, Rivero is a fast-growing European company and a Visa Fintech Partner specialising in streamlining payment operations within the highly regulated payments industry.

We focus on offering unique Saa S solutions for fraud recovery, dispute management, and payment scheme compliance.

About Rivero

Established in 2019 and headquartered in Switzerland, Rivero is a fast-growing European company and a Visa Fintech Partner specialising in streamlining payment operations within the highly regulated payments industry.

We focus on offering unique Saa S solutions for fraud recovery, dispute management, and payment scheme compliance.

Rivero strives to stand as a front-runner in the industry, offering best-in-class Saa S solutions that combine innovation with deep expertise.

We are looking for an ambitious and driven person to join us for the exciting phase ahead.

What is it like to work at Rivero?

At Rivero, we

• Act with urgency, working in fast, iterative cycles to deliver meaningful results quickly. We take initiative and collaborate effectively to keep things moving forward.
• Strive for excellence, taking ownership of our work and delivering high-quality outcomes.

We hold ourselves accountable, continuously improve, and aim to exceed expectations in all areas across the organisation.

• Embrace growth as both individuals and as a company. We are ambitious, open-minded, and focused on learning from every challenge.
• Follow an open-book management approach: We are fully transparent, sharing not only the information you need to do your job but also providing insights that help you understand how Rivero is doing as a whole.

We want to ensure that everyone is equipped to make informed decisions and contribute to our overall success.

Sounds exciting to you? Do you have such characteristic traits? Do you want to be part of our team? Then continue reading!

Tasks — What you can expect from the job

Kajo is a distributed application built around the architectural concept of event sourcing, designed to support our customers as well as our internal scheme compliance experts.

As a senior backend engineer, you will collaborate with our team on the following responsibilities:

• Expand the current functionality of Kajo with new features and improvements.
• Maintain the existing codebase(s), identify pain points, and suggest solutions.
• Develop tools that help internal users manage the operational workload.
• Lead the design and implementation of new parts of the stack as the product requirements grow.
• Use AI coding tools as a core part of your daily workflow, and help the team find better ways to use them to move faster and raise code quality.
• Pick up the occasional frontend ticket or end-to-end task alongside your backend work — we're a small, product-focused team and value engineers who can move across the stack when it's useful.
• Use your experience to enable fellow engineers by sharing your knowledge and unique points of view.
• The Kajo Backend Tech Stack

Below you can find a description of the Kajo Backend Tech Stack.

These are the tools, libraries and frameworks that you will interact with the most in the context of your daily work.

• Languages: Kotlin, Go
• Event Sourcing: Axon Framework (
• Web: Ktor, Graph QL, Hasura
• Database: j OOQ, Flyway, Postgre SQL
• Messaging: NATS (
• IAM: Keycloak
• Other technologies we use

Here’s an overview of the key technologies that we use across our company.

Some of these tools are shared across our products, so any expertise you bring in these areas is highly valued.

• Frontend: Type Script, Vue. js
• Backend: Java, Kotlin, Go, Scala, Rust, Haskell
• Infrastructure: Docker, Kubernetes, Terraform, Git Lab CI, Elastic Stack, Prometheus, Traefik, Vault, Google Cloud Platform, Nix

Requirements — What We Expect From You

We are committed to delivering high quality, high value products to our customers.

A sharp eye for detail and edge cases — as a fintech involved in scheme compliance, this is an important aspect of the role, both during implementation and the review process.

We value effective communication and everyday collaboration.

Thus, we are looking for an experienced engineer capable of delivering high quality cloud/web applications who is also comfortable working in an AI‑assisted way and open to picking up work outside a narrow backend lane.

Our requirements

Our main backend language is Kotlin and you will be mainly writing Kotlin code as part of this job.

If you are not familiar with Kotlin you can still apply if any subset of the following applies to you:

• Proficiency in any JVM language
• Exceptional expertise in any modern backend language
• Can work comfortably outside the confines of a language framework
• Feel confident that you can learn Kotlin with minimal guidance in a timely fashion
• Are willing to take a technical challenge in Kotlin
• Experience with distributed web applications
• Experience with relational databases
• Experience with designing application APIs
• Regular, hands‑on use of AI coding tools (e. g. Claude Code) in your day-to-day engineering work, and an interest in helping the team get more out of them
• Comfortable working outside a strict backend scope when needed — for example, picking up a frontend task or writing end-to-end tests.
• Other Qualifications That We Value
• Experience with event sourcing systems/CQRS
• Experience with Graph QL
• Familiarity with Go
• Familiarity with Type Script and Vue. js, or frontend experience more broadly
• Familiarity with other Infrastructure or Dev Ops tools mentioned before.

Benefits

• Collaborative

Workspace: Work from a historic building only two minutes from the Oerlikon station, with a park next door and great food/coffee options.

Alternatively, great co‑working spaces are available for employees in select locations.

• International Startup Culture: Work with a diverse team in a role with room to take ownership and growth opportunities as the company expands.
• Learn Continuously: Benefit from frequent academy sessions hosted by your peers on a variety of topics that help you both learn and grow.
• Social Events: Enjoy regular social events and bi‑annual on‑site company events in Zurich.
• Give Back to the Community: Enjoy five extra days beyond your annual holiday allowance to give back to society through volunteering or community work.

• Dog‑Friendly Office: Bring your furry friends to the office!

• Flexible Tech Set‑up: Choose your preferred hardware that best sets you up for success.
• Mobile Allowance: Receive an allowance to cover your mobile subscription costs.
• Ownership Opportunities: Participate in the company’s success through stock options.

Please note that while on‑site presence at our Zurich office is preferred, applications from remote candidates operating within a timezone reasonably aligned with Zurich are also welcome.

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