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# Senior Backend Engineer (Ruby on Rails)

- **Company:** Trustpair
- **Location:** Paris, France
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, JavaScript (Programming Language), Agile Methodology, Artificial Intelligence, Amazon Web Services, Architectural Patterns, Software Quality, Code Review, Continuous Integration, DevOps, Pair Programming, Scrum Methodology, Systems Development Life Cycle, Ruby on Rails, Ruby, TypeScript, Web Applications, Test-Driven Development (TDD), ReactJS, Delivery Pipeline, Backend, Gitlab-ci, Api Design, Docker
- **Published:** October 29, 2026
- **Apply:** https://www.welcometothejungle.com/en/companies/trustpair/jobs/senior-backend-engineer-ruby-on-rails-m-f-x_paris_TRUST_V8XW61k

## About the Role

* 5 years of experience in Ruby (Rails) back end 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, * Experience in full stack development (React, Javascript, Typescript...)
 * DevOps culture, ability to work on deployment pipelines and CI/CD tools like but not limited to: Docker, AWS, GitLab CI
 * Experience in an environment where security is important; sensitivity to good security practices
 * Experience in mentoring and leadership of junior and experienced people for good practices of software craftsmanship
 * Experience with other technologies in high-throughput environments, Applicants for all positions in Trustpair must be legally authorized to work in the country which they are applying for or be a citizen from Schengen / EU zone. The verification of employment eligibility will be required as a condition of hire.

## Description

Trustpair stops vendor fraud before it happens. We're the automated vendor validation platform protecting 600+ enterprise companies worldwide. Since 2017, finance and procurement teams have used Trustpair to eliminate vendor fraud while reclaiming 90% of the time they once spent on manual checks.

As vendor fraud grows more sophisticated, we stay ahead by combining deep expertise in financial crime with cutting-edge technology. Our core product focuses on secure, reliable vendor account validation to wipe out fraud and boost efficiency.

Internally, teams across Trustpair use AI tools in their day-to-day work to automate repetitive tasks and unlock strategic insights that help us build and operate better. From day one, you'll be encouraged and trained to integrate these tools into your workflow in a practical, hands-on way.

With offices in New York, Paris, London, and Milan, we're a diverse team united by a bias for action. We ship fast, learn from experiments, and tackle problems that matter: protecting billions in payments for companies worldwide. If you want to see your work make an immediate impact in financial security, Trustpair is built for you.

Learn more about how we use AI in our everyday work.

About the role

Integrated into our talented Engineering Department, we have two positions open, you'll work on creating a scalable and efficient product which consistently meets the needs of our clients. You'll work on collaborative topics such as designing new features & functionalities, implementation, development and even testing the application.

Trustpair's engineering team works with the latest technologies, as a Cellular Organization, meaning we reshape and adapt to ensure our teams stay autonomous, independent and have impact on the decisions made.

This is a permanent contract (CDI), suitable for candidates based in France. Hybrid within France is possible.

What you'll do:

 * Take the lead in creating innovative features by following best practices and maintaining exceptional code quality

 * Engage in every phase of the SDLC; contribute to the architecture, code development, and even oversee the launch of new releases
 * Support critical services for our customers which ensures the security of their payments
 * Keep a finger on the pulse of the technology landscape. Identify emerging technologies and industry trends, and be proactive in recommending relevant improvements to our existing stack
 * Champion engineering excellence by fostering a culture of continuous improvement. Lead by example in practices such as code reviews, Test-Driven Development (TDD), pair programming, writing clean and maintainable code, etc, * Case study with our Engineering Manager & an Engineer from our team (1h30)
 * Coffee fit with a Product Manager & an Engineer (30 mins)
 * Cofounders interview with Alexandre, our MD (45 mins)