Senior Backend Engineer (m/w/d)

Free resume; Berlin; Híbrido; EUR 70.000 - 100.000; Jornada completa

Descripción de la vacante

CarOnSale is seeking a senior backend engineer to own the architecture, drive technology choices, and set the standards the backend runs on. With 40,000 buyers across 20+ countries and 130,000 vehicles sold yearly, you will shape how it scales.

Based in Berlin or willing to relocate, you will mentor engineers, drive AI-first development with agents and LLMs, and oversee CI/CD practices in a hybrid work setup (2 days in office, 3 remote) plus additional flexible days.

Formación

• 8+ years in software engineering, 5+ years backend.
• Deep TypeScript proficiency with Node.js, NestJS and PostgreSQL.
• Proven mentorship track record and ability to raise engineering standards.
• Solid Git, Docker and CI/CD practices.
• Comfortable with Scrum or Kanban and Jira/Confluence.
• English at C1 level for daily international work.
• AI-native working style: using AI tools where appropriate.
• Based in Berlin or willing to relocate.

Responsabilidades

• Own backend development end to end: technology selection, architecture, and implementation.
• Build AI-first: coding agents, LLMs and AI-assisted development.
• Set standards: code quality benchmarks, development practices and CI/CD pipelines.
• Mentor engineers and raise the bar on backend practice.
• Challenge current approaches and drive better solutions.

Conocimientos

TypeScript

Node.js

NestJS

PostgreSQL

Git

Docker

CI/CD

Scrum/Kanban

JIRA/Confluence

English (C1)

Herramientas

Elasticsearch

Lucene

Descripción del empleo

Job Description

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: 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
• 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

Remote full-time en 66,000 76,000 GBP/yr

Remote full-time en 10,000 120,000 USD/yr