Senior Full Stack Developer (Portugal based), Luzern

smartNsales AG is a Swiss B2B Marketplace built for the CPG sector. The smartNsales Marketplace is a booking platform where brands reserve shelf space, promotional slots, and in-store activations at retail locations. Locations earn revenue, brands get distribution reach. Tasks You'd be joining as a core team member, working closely with our lead engineer. That means full ownership of features from backend to frontend, keeping things running when he's not around, and being someone the team can rely on in production. Build and maintain features across backend and frontend Handle deployments, server updates, and day-to-day infrastructure Integrate and maintain third-party services: payments (Stripe, Mollie), AI, OCR, and video APIs Keep an eye on system health, triage bugs, and jump in when production needs attention Take part in architecture discussions as we scale Requirements 6+ years of engineering experience, with at least 3 years each in Django and Next.js/TypeScript You've shipped a Stripe Connect marketplace end-to-end before Comfortable on Linux servers: SSH, Docker, Postgres backups, log triage Solid Git fundamentals: rebase, cherry-pick, conflict resolution You've worked solo or in a very small team and know when to ship, when to roll back, and when to ask Good migration habits and no fear of schema drift Disciplined about multilingual UIs: every string goes through the translation layer, no hardcoded text Fluent in English Nice to have Flutter / iOS deployment experience DNS and email deliverability (SPF/DKIM/DMARC) German, French, or Italian Experience with LLMs and prompt engineering Benefits Fully Remote Significant Ownership: Engage in a pivotal role within the Marketplace product core team, where your strategic opinions directly influence and shape the future of our product Contemporary Technology Stack: Contribute to the development of greenfield features, free from the challenges of legacy systems, enabling you to work with the latest technologies Probably not a fit if You specialise in only one area (backend, frontend, or ops) You need a full PM, design, and DevOps setup around you to be productive The idea of occasionally handling a production issue outside working hours is a dealbreaker