Senior Full-Stack Developer (m/f/d) - TypeScript / Next.js

We are currently developing a new B2B SaaS product in stealth mode.

The technical foundation is in place, initial core product features have already been developed, and now the most exciting phase for us begins: building a market-ready product from a strong foundation that we can then scale.

For this, we are looking for a Senior Full-Stack Product Engineer (m/f/d) who doesn't just process requirements but takes technical and product responsibility.

You will work directly with the founder, have a significant influence on product and architecture, and accompany features from the initial idea to productive deployment.

Responsibilities

• Further development of our existing B2B SaaS platform in the frontend and backend
• Conception and implementation of new features from data structure to user interface
• Further development of complex, interactive web interfaces
• Development and integration of AI-powered functions and workflows
• Conception and connection of external APIs and services
• Further development of our data models and backend architecture
• Ensuring code quality through testing, reviews, and a clean architecture
• Improving performance, UX, security, and scalability
• Technical evaluation of new product ideas and independent development of solution proposals
• Active participation in shaping our future product and technology roadmap

Qualifications

• Several years of experience in developing modern web applications or SaaS products
• In-depth experience in modern software development – ideally with TypeScript, React, and Next.js – as well as the ability to quickly learn new technologies and frameworks
• Proficient in working with APIs, data models, and modern authentication and authorization concepts
• Good understanding of software architecture, testing, performance, and security
• Experience with modern deployment and CI/CD processes
• Ability to quickly get up to speed with an existing codebase and take responsibility for it
• Strong product understanding: You don't just think about how something is built, but also why
• High quality standards combined with pragmatism and speed
• AI-assisted development is a matter of course for you in modern software development

Our Tech Stack

Even though we are in stealth mode, I would reveal quite a bit here, as it doesn't betray any significant product secrets:

Next.js · React · TypeScript · PostgreSQL · Prisma · tRPC · Zod · Tailwind CSS · Vercel

In addition, we intensively use AI-assisted development and AI functions within our products.

Our stack is not a dogma. Good technical arguments are more important to us than "we've always done it this way".

Benefits

• An ambitious team with high standards for our joint work
• No-bullshit culture: direct, honest, pragmatic, and solution-oriented
• Modern workplace with high-quality hardware and software
• Open communication, short decision-making paths, and results-oriented work
• €100 monthly employer-funded company pension scheme
• Regular team events and offsites
• Secure and permanent employment contract
• Flexible working hours and a lot of personal responsibility
• Consistent use of AI and modern digital tools

We are not looking for a developer who waits in the morning to be assigned the next ticket.

We are looking for someone who wants to build a product.

With us, you will get a lot of freedom, direct influence on technical decisions, and the opportunity to co-develop a new SaaS product from an early stage to market and beyond.

We will gladly tell you exactly what we are building in person during the application process.

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