Senior Backend Engineer – Payroll Platform (Hybrid Zürich)

ServiceHunter AG - quitt, quinn; Zürich; Hybrid; CHF 120,000 - 180,000; Full time

Job summary

quinn is hiring a Senior Backend Developer to own the backend of quinn ONE. You will design, build and run C#/.NET 10 modules and APIs, with a PostgreSQL data model and migrations. You will ensure security, observability and scalable performance in production.

You will collaborate across Switzerland with our Armenia team, mentor engineers, review code, and shape the architectural boundaries between the core and country layers. English is required; German is a plus.

Qualifications

• Shipped and run production systems in C# and modern .NET / ASP.NET Core.
• PostgreSQL schema design, transactions, indexing and query optimisation.
• Designed APIs and modules with clear boundaries and dependencies.
• Security and data protection by design in payroll context.
• Familiar with AI tools and using them to improve productivity.
• Independent initiative, risk awareness and ownership.
• Mentor teammates, review code, and share knowledge.
• English working language; German a plus.

Responsibilities

• Backend modules, end to end: design, build, test and run APIs.
• Data modeling in PostgreSQL: schemas, migrations, indexing.
• Foundations: audit trail, logging, API versioning and upgrades.
• Production reliability and security by design.
• Architectural boundaries: core vs country layers with trade-offs.
• Mentor developers in Zurich and in the Armenia team.

Skills

C# / .NET prod

ASP.NET Core

PostgreSQL

API design

Security by design

AI tooling

Mentoring teammates

English working

Tools

ASP.NET Core

PostgreSQL

Job description

quinn is hiring a Senior Backend Developer to own the backend of quinn ONE. You will design, build and run C#/.NET 10 modules and APIs, with a PostgreSQL data model and migrations. You will ensure security, observability and scalable performance in production.

You will collaborate across Switzerland with our Armenia team, mentor engineers, review code, and shape the architectural boundaries between the core and country layers. English is required; German is a plus.