Senior Backend Engineer (f/m/x)
Skills
About the role
Senior Backend Engineer (f/m/x) | Berlin
You 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 remote
About us
CarOnSale 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 own
You own backend development end to end: technology selection, architecture design, and implementation of the features that carry platform performance and scale
You build AI-first. Coding agents, LLMs and AI-assisted development are part of the daily workflow here, not a pilot project
You set the standards: code quality benchmarks, development practices, and CI/CD pipelines, agreed cross-functionally and enforced in review
You mentor the engineers around you, share what you know, and raise the bar on backend practice
You challenge how we work. When our approach is wrong, you say so and you bring the better one
What you bring
8+ years in software engineering, 5+ of them focused on backend
Deep TypeScript proficiency, with strong Node.js, NestJS and PostgreSQL experience
Proven mentorship track record - you have coached engineers and raised the standard around you
Solid command of Git, Docker and CI/CD pipelines
Comfortable in Scrum or Kanban, working with JIRA and Confluence
English at C1 level or above, written and spoken, for daily work with an international team
AI-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't
Based in Berlin or ready to relocate
Nice to have:
WebSockets or other real-time systems
Search frameworks such as Elasticsearch or Lucene
Automotive or B2B trading background
Conversational German
What you get
Hybrid working - 3 days in our Berlin-Schöneberg office, 2 days remote
Architecture ownership from day one, not after a probation period
28 days annual leave
Company pension with 20% employer contribution
Subsidised Deutschlandticket
FitX or Urban Sports Club membership subsidy
Structured onboarding with buddy programme
An engineering culture where AI tooling is embedded in how the work gets done
Direct access to the full European engineering team
Backing 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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