(Senior) Backend / Fullstack Developer (m/w/d)

io, we offer an easy and efficient way for everyone to create and sell digital products and online courses. Then, in September 2021, we raised $38 million in series A funding led by Target Global, with participation from Partech Ventures and Avid Ventures. to build software that empowers everyone to start, run and grow a successful digital business - borderless , is supported by our high performance principles that are crucial to our success:
Think of it as a startup within a scale-up: small, empowered, and business-first.
As our Full-Stack Engineer , you'll help shape 0→1 products where AI meets commerce — with direct impact on seller success, customer journeys, and our bottom line. js, delivering both frontend experiences and robust backend services.
Backend Engineering Excellence
5+ years of professional software development experience with strong JavaScript/TypeScript expertise.

• js knowledge beyond the frontend—you understand App Router, Server Components, caching strategies, and the full-stack capabilities of modern Next.js.
• Solid backend engineering fundamentals: you can explain and implement concepts like idempotency, rate limiting, dependency injection, and database transactions.
• Hands-on experience with relational databases (PostgreSQL preferred), including query optimization and ORM patterns.
• Python experience for AI/ML integrations.

E-commerce, SaaS, or FinTech domain experience.
Contributions to open-source or prior incubator/startup experience.
Benefits
Paid Time Off - 30 vacation days.
A competitive salary.
A personal training & development budget of € 1,500 per year.
Individual coaching and further training to support you in your development.
Employee discounts at numerous companies (e.g. at the gym or in online stores).