Staff Software Engineer - Architect & Build New Multi-Tenant SaaS

Greenstep Sverige AB; Espoo; On-site; EUR 120,000 - 180,000; Full time

Job summary

Greenstep Sverige AB is assembling a small, senior team to build a new multi-tenant SaaS product from day zero. The stack is Go for core services, Python for AI and reporting, and React/TypeScript on the frontend, with Postgres and event-driven architecture. The role is hands-on and demands architectural ownership and strict quality.

Details will be shared in conversations. You will work closely with a compact, senior group and contribute to the product's design, data residency, and tenant

Qualifications

• Senior Staff Software Engineer with hands-on responsibilities.
• Own the architecture and define service boundaries for a new multi-tenant SaaS product.
• Emphasizes correctness, testing, and code reviews as non-negotiables.

Responsibilities

• Own the architecture of the system and define the boundaries between services and failure models.
• Design and build services end-to-end across Go core and Python layer.
• Own the multi-tenancy model including tenant isolation and data residency.
• Define the data layer's long-term strategy and scaling considerations.
• Use AI coding agents daily and maintain code quality.

Skills

Go

Python

React

TypeScript

PostgreSQL

Software architecture

Testing & reviews

AI tooling

Job description

Greenstep Sverige AB is assembling a small, senior team to build a new multi-tenant SaaS product from day zero. The stack is Go for core services, Python for AI and reporting, and React/TypeScript on the frontend, with Postgres and event-driven architecture. The role is hands-on and demands architectural ownership and strict quality.

Details will be shared in conversations. You will work closely with a compact, senior group and contribute to the product's design, data residency, and tenant