Senior Software Engineer (B2B SaaS)

Senior Software Engineer (B2B SaaS) — smartNsales AG Germany · Full Remote · Full-time or Freelance 📩 [email protected]

Fluent German and English required. French is a plus.

About smartNsales AG

smartNsales AG is a Swiss B2B platform built for the CPG sector.

smartNsales Marketplace lets brands book shelf space, promotional slots, and in-store activations at retail locations.

smartNsales Enterprise is a SaaS product for CPG brands to manage Key Account Management, trade marketing, activations, field execution, and budget control from one place.

Founder-led, headquartered in Lucerne.

The Role

We are looking for a Senior Software Engineer to own and build SNS Enterprise from its current early-stage foundation.

You will work directly with the CPO and CEO to shape and build the product as you go. You own the full stack: schema design, backend logic, frontend quality, test coverage, and CI pipeline. You use AI-assisted development as a core part of how you work, and you have a clear sense of where AI can genuinely improve the product for the end user.

You will occasionally speak with clients. You think about what you are building and why, not just how. You care whether what you build actually solves the problem.

As the product grows, you will hire and lead a small engineering team for Enterprise.

This is not a role for someone who wants to manage without building, or build without thinking about the product.

Your Responsibilities

• Build SNS Enterprise end-to-end. Own database design, Prisma schema evolution, multi-tenant data model, and migration strategy.
• Work directly with the CPO and CEO to define, prioritise, and ship features.
• Own the full stack from backend to frontend, with high standards for code quality, performance, and reliability.
• Use AI-assisted coding tools fluently and bring a clear point of view on where AI adds real value in the product.
• Engage with clients occasionally, listen, and translate what you hear into product decisions.
• Hire and lead the Enterprise engineering team as the product scales.

What We Are Looking For

• 7+ years in software engineering with a track record of shipping B2B SaaS products end-to-end.
• Strong Next.js / React / TypeScript.
• Solid backend experience across Python/Django, PostgreSQL, Redis.
• Experience with Docker, GitLab CI/CD, and multi-environment deployments.
• Fluent with AI-assisted development tooling (Cursor, Claude, or similar).
• Experience in a startup or scale-up environment.
• Must be fluent in German and English. French is a plus.
• Background in FMCG, retail tech, or trade/KAM is a plus.

What We Offer

Full remote from Germany. Open to full-time employment or freelance contract.

How to Apply

Send a note to [email protected]. Tell us what you have built and what you would look at first if you joined tomorrow.