Senior Backend Developer

Payroll that runs itself. You build the part that runs it.

quinn is an app-based managed payroll and employment-administration service for households and companies who employ people directly. The customer stays the legal employer. quinn registers the employment, runs payroll, pays salaries, social insurance and taxes, and handles every filing that follows, on their behalf and automated end to end.

We don’t sell payroll software. We run payroll.

We operate in Switzerland, Germany and the UK. Last year more than CHF 200 million in salaries ran through our systems, correct to the cent. The purpose behind it is simple: fair employment, for all.

Why this role exists

Every market brings its own authorities, insurers, pension funds and tax rules. Our answer is quinn ONE: one platform for every product and market, with a shared core for what all countries have in common and a configuration layer per country on top, designed to carry twelve countries.

The backend is that core. It is a modular monolith in C#, .NET 10 and PostgreSQL, serving one quinn app for employers, employees and our own support team, Maestro for batch processing, and our AI agents. Development has started, and the foundations the platform will run on for years are being laid now.

This role is fully focused on quinn ONE. Our existing products are not part of it.

What you will own

Backend modules, end to end. Design, build, test and run modules and the APIs they expose, from requirements to production, without waitin