Freelance Senior Ruby on Rails Engineer - Paris

Trustpair; Paris; On-site; EUR 111,000 - 166,000; Full time

Job summary

Trustpair in Paris is seeking a senior backend engineer (Ruby on Rails) for a freelance contract. You will design and implement scalable features, collaborate across squads, and help deliver secure payment-focused services.

You’ll work in an autonomous engineering culture, participate in the SDLC, and mentor others while adopting AI-driven tooling. English required; EU-based candidates welcomed.

Qualifications

• 5+ years of Ruby (Rails) back end development experience.
• Ability to conceive the technical design of a complex product feature.
• Experience on a rapidly growing product with scalable architectures.
• Experience working in an Agile environment (Scrum or Kanban).
• Experience in API development with emphasis on resilience, scalability and security.

Responsibilities

• Lead the design of innovative features with high code quality.
• Contribute to the full SDLC, including architecture, coding, and releases.
• Support critical services to ensure secure payments.
• Monitor the tech landscape and propose improvements to the stack.
• Promote engineering excellence through code reviews, TDD, and mentoring.

Skills

Ruby on Rails

Architectural design

Agile (Scrum/Kanban)

API development

English fluency

Tools

Docker

AWS

GitLab CI

Job description

Trustpair in Paris is seeking a senior backend engineer (Ruby on Rails) for a freelance contract. You will design and implement scalable features, collaborate across squads, and help deliver secure payment-focused services.

You’ll work in an autonomous engineering culture, participate in the SDLC, and mentor others while adopting AI-driven tooling. English required; EU-based candidates welcomed.