Freelance Senior Rails Engineer — AI-Driven Impact

Trustpair; Paris; Hybrid; EUR 83,000 - 124,000; Part time

Job summary

Trustpair is seeking a freelance backend developer for EU-based work focused on Ruby on Rails. You will join an autonomous engineering squad designing scalable product features, implementing secure APIs, and shaping the architecture in a fast-growing fintech-focused environment.

Work includes collaborating across a Cellular Organization, embracing AI-assisted tools, and delivering high-quality code while driving technical excellence and long-term challenges.

Qualifications

• 5+ years of Ruby (Rails) backend development.
• Ability to conceive the technical design of a complex product feature.
• Experience on working on a rapidly growing product; knowledge of architectural models of large scale web applications.
• Experience working in an Agile environment like Scrum or Kanban.
• Experience in API development and knowledge of resilience, scalability and security constraints.
• Fluent in English.
• Desire to work on longer term technical challenges & accomplish them.

Responsibilities

• Lead feature development with strong code quality.
• Engage in every phase of the SDLC; contribute to architecture, code development, and oversee releases.
• Support critical services for our customers ensuring the security of their payments.
• Keep abreast of technology trends and propose relevant improvements to our stack.
• Champion engineering excellence with practices like code reviews, TDD, and pair programming.

Skills

Ruby on Rails

English fluency

API development

Agile/Scrum/Kanban

Backend development

Tools

Docker

AWS

GitLab CI

Job description

Trustpair is seeking a freelance backend developer for EU-based work focused on Ruby on Rails. You will join an autonomous engineering squad designing scalable product features, implementing secure APIs, and shaping the architecture in a fast-growing fintech-focused environment.

Work includes collaborating across a Cellular Organization, embracing AI-assisted tools, and delivering high-quality code while driving technical excellence and long-term challenges.