Senior Backend Engineer

CarOnSale

München, Germany

5 days ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience level

Expert

Experience required

5 years minimum

Working hours

Regular working hours

Languages

English, German

Job source

www.adzuna.de

Tech stack

Artificial Intelligence Apache Lucene Software Quality Continuous Integration Elasticsearch PostgreSQL Node.Js Scrum Methodology Software Engineering TypeScript WebSocket Real Time Systems

+6 more

Large Language Models Backend Git Atlassian Tools NestJS Docker

Job description

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

Requirements

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

About the company

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., * 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