Full-Stack Developer

FULL-STACK HUMAN - Work Directly With CTO At Fast-Growing AI Startup at amplifa GmbH Requirements Please note that this position requires EU work authorization. Language: English - Fluent Full-stack developerComfortable with UI, backend, databases, and basic devopsTake pride in owning complex features from end to endLoves buildingExcellent written communication in EnglishHas strong opinions on the best way to work with coding agentsExperience implementing AI features at scale in production appsExperience in Rails or similar frameworksRuby on Rails 3 yearsLLM 3 yearsFront end 3 years Activities True full-stack developerComfortable with UI, backend, databases, and basic devopsTake pride in owning complex features from end to endLoves buildingHas strong opinions on the best way to work with coding agentsExperience implementing AI features at scale in production appsExperience in Rails or similar frameworks Team Amplifa is a 1-year-old bootstrapped startup with a tight, super productive team based in Dusseldorf and Tel Aviv. This role will work directly with the CTO. About The Company amplifa – building the sales engine of the industrial Mittelstand. amplifa is one of the fastest-growing B2B sales agencies in the DACH region. We take over the entire new customer acquisition for industrial companies – from machine builders to medtech manufacturers – running AI-powered multichannel outbound campaigns across email, LinkedIn, and AI voice, on a performance-based pay-per-meeting model. Our stack: Clay, Apollo, n8n, Claude & our own AI tooling infrastructure (app.amplifa.ai). Our clients: leading Mittelstand companies like Schaltbau, Bühler Motor, REMIRA, and Kögel. Our growth: seven-figure contracted ARR – with significant new revenue added every month. Here, you'll work directly with the founders, with maximum ownership and zero corporate politics. If you want to make a real impact at the intersection of AI and sales – with a team that decides fast and executes faster – you'll fit right in. 📍 Düsseldorf | Remote-flexible | First-name culture Click on "Apply" for details on the benefits, the team and the application process.