Freelance Senior Software Engineer (Ruby on Rails) M/F/X

Freelance Senior Software Engineer (Ruby on Rails) M/F/X We usually respond within three days Trustpair stops vendor fraud before it happens. We're the automated vendor validation platform protecting 400+ 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 Team, you’ll work within one of our feature squads 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 freelance contract, open to candidates based in the EU. 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 What’s in it for you 👀 High-Impact in a High-Growth Environment: Join a company with 50% business growth, where tech is one of the core accelerators. You'll be building solutions for a platform with rapidly increasing usage, directly influencing our success. Shape Our Future: We want your voice in making the critical architectural, product, and organizational decisions that will define our future. Modern Stack & AI-Powered Engineering: Work with a clean Ruby on Rails stack, state-of-the-art DevOps, and managed tech debt. We are aggressively adopting AI, both in our product (LLMs) and to boost your own efficiency with tools like Cursor. Culture of Full-Fledged Engineering Ownership: We don't see you as just a developer. You are an engineer with a strong voice and full accountability. We empower you to drive initiatives from technical design to final impact. Accelerated Career Growth: Our rapid expansion creates constant and significant opportunities for career advancement, skill development, and taking on new leadership responsibilities. Collaborative & International Team: Thrive in a diverse, cross-functional, and international environment. We leverage collective intelligence and a supportive, senior team to solve cutting-edge challenges. Why join Trustpair? A full list of our perks here ! Must-Haves: 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 Nice-to-Haves: 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 Recruitment process First call with Aicha, Talent Acquisition Manager (30 mins) Experience interview with an Engineering Manager (1h) Case study with our Tech Lead & an Engineer from our team (1h30) Coffee fit with a Product Manager & an Engineer (30 mins) Cofounders interview with Alexandre, our MD (45 mins) Equal Opportunity Statement Trustpair's policy is to provide equal employment opportunity in all of our employment practices without regard to race, color, religion, sex, national origin, ancestry, marital status, protected veteran status, age, individuals with disabilities, sexual orientation or gender identity or expression or any other legally protected category. 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. Department Engineering Locations Paris | Headquarters Remote status Fully Remote Paris | Headquarters Workplace & culture The team working at Trustpair are all different, coming from very diverse backgrounds, countries, companies and work environments. As Trustpair evolves, so do our teams! Since 2017, we've developed structured departments that are set up for success through the processes, methodologies, training and tools we use. We work hard, have ambitious goals, but we also have a lot of fun together. The Trusteam and the quality of our interpersonal relationships is frequently mentioned as one of our strongest assets. Good to know Strong international development (current focus on Europe & the USA) Excellent business prospects: strong product, strong market fit, no client churn Excellent work-life balance with initiatives in place to support Flexible remote policy for all employees Central offices in Paris & NYC Ambitious & exciting work environment; opportunity to work on many initiatives