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Senior Backend Engineer (Node.js / NestJS) – Greenfield Product

CCarOnSale
Seniority
Senior
Model
Hybrid
Sector
Mobility
Salary
Undisclosed
Contract
Full-Time

About the role

Castle Tech is seeking a Senior Backend Engineer to help build a new standalone product from the ground up. You'll play a key role in shaping the product's architecture, backend services, and technical direction while working with a team that actively uses AI tools to enhance development workflows.

What you'll do

  • Build and maintain scalable backend services using Node.js and NestJS
  • Design clean system architecture for a new production product
  • Take ownership of features from concept through deployment
  • Define and implement APIs, services, and backend infrastructure
  • Collaborate with frontend engineers, product managers, and designers
  • Establish development standards, CI/CD pipelines, and engineering best practices
  • Mentor other engineers through code reviews and technical feedback
  • Use AI-assisted coding tools and evaluate AI output critically

What you'll need

  • 5+ years of backend engineering experience
  • Strong experience with TypeScript, Node.js, and NestJS
  • Experience designing scalable backend architectures
  • Strong understanding of software design principles and maintainable systems
  • Experience with relational databases (PostgreSQL or similar)
  • Experience working with Git, CI/CD pipelines, and Docker
  • Experience mentoring or supporting other engineers
  • Experience working in agile teams (Scrum or Kanban)
  • Strong communication skills in English

Nice to have

  • Experience with microservices or event-driven architectures
  • Experience building greenfield or standalone products
  • Familiarity with AI-related components such as RAG or vector databases
  • Experience integrating AI services or data-driven systems
  • Conversational German

What they offer

  • Build something new - work on a greenfield product from the beginning
  • Real technical ownership - influence system design and architecture
  • Modern engineering environment with Node.js, NestJS, and modern tooling
  • AI-forward engineering culture
  • Hybrid work model with office and remote options in Berlin or Munich
  • Your choice of MacBook or Windows with preferred tools
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