Senior Backend Engineer
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Job Description
Senior Backend Engineer owning architecture and backend scale for CarOnSale’s AI-powered B2B used-car trading platform. Building with TypeScript, Node.js, NestJS, PostgreSQL, and AI tooling.
Responsibilities:
- Own backend development end to end, including technology selection, architecture design, and implementation of features that carry platform performance and scale
- Build AI-first using coding agents, LLMs, and AI-assisted development as part of the daily workflow
- Set code quality benchmarks, development practices, and CI/CD pipelines, agreed cross-functionally and enforced in review
- Mentor engineers, share knowledge, and raise backend engineering standards
- Challenge existing ways of working and propose better approaches
- Design and scale backend systems supporting 40,000 buyers, more than 20 countries, and 130,000 vehicles sold annually through the auction backend
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
- Available to start your day at 7:00 Brazil local time
- Nice to have: WebSockets or other real-time systems
- Nice to have: Search frameworks such as Elasticsearch or Lucene
- Nice to have: Automotive or B2B trading background
Benefits:
- Fully remote from anywhere in Brazil
- 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
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