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Backend Engineer — AI Trainer

Freelance/Independant

France (France), Germany (Germany), Belgium (Belgium), Netherlands (Netherlands), United Kingdom (United Kingdom), Italy (Italy), Spain (Spain), Portugal (Portugal), Denmark (Denmark), Finland (Finland), Sweden (Sweden), Norway (Norway), Switzerland (Switzerland), Poland (Poland)

Published on 2 June 2026

  • Contract

    Freelance/Independant

  • Locations

    France (France), Germany (Germany), Belgium (Belgium), Netherlands (Netherlands), United Kingdom (United Kingdom), Italy (Italy), Spain (Spain), Portugal (Portugal), Denmark (Denmark), Finland (Finland), Sweden (Sweden), Norway (Norway), Switzerland (Switzerland), Poland (Poland)

  • Start date

    As soon as possible

  • Salary

    60 EUR - 130 EUR / hourly

  • Remote working

    Fully remote possible

JT AI Labs illustration

Job Title: Backend Engineer

Job Type: Contract

Location: Remote

Job Summary: In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters.

Key Responsibilities:

  • Design, develop, and maintain scalable backend services and APIs that meet demanding performance requirements.
  • Collaborate cross-functionally to translate business needs into technical specifications and impactful backend solutions.
  • Optimize backend systems for reliability, security, and efficiency, ensuring seamless user experiences.
  • Write clean, well-documented, and thoroughly tested code, adhering to best engineering practices.
  • Participate actively in code reviews, mentoring, and knowledge sharing sessions with fellow engineers.
  • Monitor, troubleshoot, and resolve backend issues in production environments, targeting root causes and continuous improvements.
  • Contribute to architecture discussions and decisions, bringing innovative ideas and a solutions-oriented mindset.

Required Skills and Qualifications:

  • 1+ Years Proven expertise in backend development using modern programming languages.
  • Extensive experience designing and implementing RESTful APIs and microservices architectures.
  • Strong proficiency with relational and NoSQL databases, along with data modeling principles.
  • Deep understanding of system security, authentication, and authorization best practices.
  • Experience with cloud platforms (AWS, GCP, or Azure) and containerization (Docker, Kubernetes).
  • Excellent written and verbal communication skills, with a collaborative and proactive approach.
  • Ability to thrive in a fast-paced, fully remote expert team environment.

Preferred Qualifications:

  • Familiarity with event-driven or server less architectures.
  • Experience with CI/CD pipelines and automated testing frameworks.
  • Background in mentoring or technical leadership within backend teams.

Join jtlabs.ai to see all available opportunities.

Application deadline

As long as the job is online

Study level

Master level or equivalent; Doctorate

Job Category

Technology

More about the company

JT AI Labs

Use your expertise to train leading AI models