Senior Backend Engineer (m/w/d)
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Before you apply
LocationBerlin, Germany
Work modehybrid
Typefull-time
SenioritySenior
Experience8+ yrs
DepartmentEngineering
EquityIncluded
Company size501–1,000 people
PostedAug 13, 2026 · 2mo ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
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: 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
AI-native working style: uses AI tools in development workflow
WebSockets or other real-time systems
Search frameworks such as Elasticsearch or Lucene
Automotive or B2B trading background
Conversational German
Based in Berlin or ready to relocate
Skills
TypeScript
Node.js
NestJS
PostgreSQL
Git
Docker
CI/CD
JIRA
Confluence
WebSockets
Elasticsearch
Lucene
Benefits
Hybrid work
Work from anywhere
Annual leave
Career development
Pension
Public transport
Gym membership
Stock options
It equipment
Onboarding
Diversity programs
About the role
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: Central Berlin
About us
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.
One Platform. One Profit Engine.
Your responsibilities
•
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
•
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
What to expect from us
•
Hybrid working: 3 days in office, 2 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 now — your CV is enough.