Senior Ruby Backend Engineer – AI/LLM, Remote

Trustpair; Paris; Hybrid; EUR 110,000 - 207,000; Full time

Job summary

Trustpair is seeking a Senior Freelance Staff Software Engineer to join our Core Evaluation squad in Paris (hybrid) or fully remote from France. You will be the technical authority shaping our fraud‑detection engine, architecting scalable, resilient solutions and guiding the integration of LLM‑based insights.

You’ll collaborate with Engineering Manager, Product Manager and engineers to translate strategic vision into technical reality, driving complex initiatives from concept to execution in a

Qualifications

• 8 years experience with high‑throughput environments.
• 2–3 years with Ruby on Rails.
• Proven architect of large‑scale systems, with asynchronous workflows.
• Observability expertise with Datadog, Prometheus, Grafana.
• DevOps mindset and experience scaling apps on Kubernetes.
• Performance optimization across applications, databases and infra.
• Strong collaboration in agile teams and influence without authority.
• Continuous learner keeping up with evolving tech.

Responsibilities

• Architect and Own: design the technical vision for large‑scale, distributed systems central to our platform.
• Lead Technical Strategy: drive complex projects from conception to completion.
• Shape the Future: partner with leadership to refine the technical roadmap and tackle challenges.
• Drive Innovation: apply LLM‑based solutions to improve the Trustpair engine.
• Mentor and Elevate: act as a technical mentor across squads.
• Ensure Operational Excellence: promote observability, scalability and performance.

Skills

Leadership

Collaboration

Problem solving

Customer focus

Tools

Ruby on Rails

Datadog

Prometheus

Grafana

Kubernetes

PostgreSQL

Job description

Trustpair is seeking a Senior Freelance Staff Software Engineer to join our Core Evaluation squad in Paris (hybrid) or fully remote from France. You will be the technical authority shaping our fraud‑detection engine, architecting scalable, resilient solutions and guiding the integration of LLM‑based insights.

You’ll collaborate with Engineering Manager, Product Manager and engineers to translate strategic vision into technical reality, driving complex initiatives from concept to execution in a