C
Senior Backend Engineer (m/w/d)
Contract type
Ongoing
Work mode
Hybrid · 2 days/week in office · Berlin, Germany
Experience
Senior · 8+ years
Job description
Senior backend engineer who owns backend development end to end — technology selection, architecture design and implementation — for CarOnSale's B2B used car auction platform. The role sets code quality, CI/CD and development standards and mentors other engineers.
At a glance
- Employment
- Full-time
- Work mode
- Hybrid · 2 days/week in office · Berlin, Germany
- Languages
- English – C1
What you'll do
- Own backend development end to end: technology selection, architecture design, and implementation of the features that carry platform performance and scale
- Build AI-first, with coding agents, LLMs and AI-assisted development part of the daily workflow
- Set the standards: code quality benchmarks, development practices and CI/CD pipelines, agreed cross-functionally and enforced in review
- Mentor the engineers around you, share what you know, and raise the bar on backend practice
- Challenge how we work: when our approach is wrong, say so and bring the better one
What we're looking for
- 8+ years in software engineering, 5+ of them focused on backend
- Deep TypeScript proficiency, with strong Node.js, NestJS and PostgreSQL experience
- A 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, 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
Benefits
- Hybrid working: 2 days in office, 3 days remote – plus 25 "Work from Anywhere" days per year
- 28 days annual leave
- 2× annual career & development conversations
- Company pension with 20% employer contribution
- Fully paid Deutschlandticket (public transport)
- FitX membership or Urban Sports Club subsidy
- Virtual stock options — share in the upside
- Modern IT setup for your day-to-day work
- Structured onboarding with buddy programme and social events
- Lived diversity: active women's network, meditation & prayer room
Apply
Direct apply at caronsale
Opens the job posting at caronsale
About CarOnSale
One Platform. One Profit Engine.
CarOnSale is the AI-powered platform 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.
Key facts
- Central Berlin
- B2B used car trading
- Over 40,000 buyers from more than 20 countries trade on the platform
- 85% of inventory is exclusive to CarOnSale
- 130,000 vehicles sold a year through one auction backend