Senior Backend Engineer (f/m/x) | BerlinYou don't want another role where someone else owns the architecture and you own the tickets. Here you pick the technology, design the architecture, and set the standards the backend runs on. 40,000 buyers. 20+ countries. 130,000 vehicles sold a year through one auction backend, and you decide how it scales.Location: Berlin-Schöneberg — hybrid, 3 days office / 2 days remoteAbout UsCarOnSale is the AI-powered operating system for B2B used car trading in Europe. Over 40,000 buyers from more than 20 countries trade on our platform, and 85% of inventory is exclusive to us. We connect software, pricing intelligence, logistics and financing in one layer — as the operating system for an entire industry.One Platform. One Profit Engine.What You OwnYou own backend development end to end: technology selection, architecture design, and implementation of the features that carry platform performance and scaleYou build AI-first. Coding agents, LLMs and AI-assisted development are part of the daily workflow here, not a pilot projectYou set the standards: code quality benchmarks, development practices, and CI/CD pipelines, agreed cross-functionally and enforced in reviewYou mentor the engineers around you, share what you know, and raise the bar on backend practiceYou challenge how we work. When our approach is wrong, you say so and you bring the better oneWhat You Bring8+ years in software engineering, 5+ of them focused on backendDeep TypeScript proficiency, with strong Node.js, NestJS and PostgreSQL experienceProven mentorship track record — you have coached engineers and raised the standard around youSolid command of Git, Docker and CI/CD pipelinesComfortable in Scrum or Kanban, working with JIRA and ConfluenceEnglish at C1 level or above, written and spoken, for daily work with an international teamAI-native working style — you use AI tools in your own development workflow and have real judgement about where they accelerate you and where they don'tBased in Berlin or ready to relocateNice to have:WebSockets or other real-time systemsSearch frameworks such as Elasticsearch or LuceneAutomotive or B2B trading backgroundConversational GermanWhat You GetHybrid working — 3 days in our Berlin-Schöneberg office, 2 days remoteArchitecture ownership from day one, not after a probation period28 days annual leaveCompany pension with 20% employer contributionSubsidised DeutschlandticketFitX or Urban Sports Club membership subsidyStructured onboarding with buddy programmeAn engineering culture where AI tooling is embedded in how the work gets doneDirect access to the full European engineering teamBacking behind the platform you build on: founded 2018, 400 people, €70M Series C in July 2025 led by Northzone and HV Capital

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