CarOnSale

European B2B used-car marketplace and auctions

Senior Backend Engineer

Backend EngineeringConfirmed live in the last 24 hours

Full-timeRemote in BrazilNo salary listed

About the Job

Requirements

At least 8 years of software engineering experience, including at least 5 years focused on backend engineering.
Deep proficiency in TypeScript and strong experience with Node.js, NestJS, and PostgreSQL.
A proven track record of mentoring and coaching engineers and raising engineering standards.
A solid command of Git, Docker, and continuous integration and continuous delivery pipelines.
Comfort working with Scrum or Kanban and using JIRA and Confluence.
English proficiency at C1 level or above, written and spoken.
Use AI tools in personal development workflows and exercise judgment about where they are effective.
Availability to start the workday at 7:00 Brazil local time.

Responsibilities

Own backend development end to end, including technology selection, architecture design, and implementation of features supporting platform performance and scale.
Use coding agents, large language models, and AI-assisted development as part of the daily workflow.
Set code-quality benchmarks and development practices, and establish and enforce continuous integration and continuous delivery pipelines through cross-functional agreement and review.
Mentor engineers, share knowledge, and improve backend engineering practices.
Challenge existing approaches and propose better alternatives.

Desired Qualifications

Experience with WebSockets or other real-time systems.
Experience with search frameworks such as Elasticsearch or Lucene.
Automotive or B2B trading experience.

You don't want another agency contract 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: Remote from anywhere in Brazil, freelance contract. Your day starts at 7:00 local time to overlap with the European engineering team.

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.

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
Available to start your day at 7:00 Brazil local time

Nice to have

WebSockets or other real-time systems
Search frameworks such as Elasticsearch or Lucene
Automotive or B2B trading background

What you get

Fully remote from anywhere in Brazil, on a freelance contract
Architecture ownership from day one, not after a probation period
An engineering culture where AI tooling is embedded in how the work gets done
Direct access to the European engineering team, not a client-vendor layer in between
Backing behind the platform you build on: founded 2018, 400 people, €70M Series C in July 2025 led by Northzone and HV Capital

Apply now — your CV is enough.

About the Company

CarOnSale

European B2B used-car marketplace and auctions

CarOnSale is a European B2B marketplace that connects professional car dealers with exclusive used-vehicle inventory and manages the full transaction flow. It runs dynamic auctions, vehicle inspections and COSCheck condition reporting, pricing intelligence, logistics coordination, payments, and auction fulfillment. Dealers can list surplus vehicles and receive guaranteed pricing offers or put them into auctions; buyers access a curated pool of vehicles from licensed OEMs, with transparent condition and history data, and can bid in daily auctions or use Buy Now. The platform functions as a technology-led facilitator that cuts intermediaries and friction in wholesale used-car trade, standardizes inspection, delivery, and payment processes across Europe for cross-border deals, and offers tools to outsource parts of the remarketing workflow to help dealers scale without adding staff.

Company size: 201-500
Company stage: Series C
Total funding: $158.6M
Headquarters: Berlin, Germany
Founded: 2018

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