{"id":502966,"url":"https://alion.io/job/trustpair-freelance-senior-software-engineer-ruby-on-rails-mfx","title":"Freelance Senior Software Engineer (Ruby on Rails) M/F/X","company":{"id":172851,"name":"Trustpair","domain":"trustpair.com","url":"https://alion.io/company/trustpair","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":{"grade":"A","score":91,"open_postings":16,"ghost_share":0.063,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":116,"computed_at":"2026-11-01T06:10:25Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"freelance","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Paris, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":52000,"max_usd":88000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":148},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Cursor","optional":false},{"name":"Kanban","optional":false},{"name":"Ruby","optional":false},{"name":"Ruby on Rails","optional":false},{"name":"Scrum","optional":false},{"name":"AWS","optional":true},{"name":"CI/CD","optional":true},{"name":"Docker","optional":true},{"name":"GitLab CI","optional":true},{"name":"JavaScript","optional":true},{"name":"React.js","optional":true},{"name":"TypeScript","optional":true}],"status":"live","first_seen_at":"2026-01-27T11:15:39Z","employer_posted_date":"2026-01-27","last_verified_at":"2026-11-01T10:20:55Z","board_verified":true,"closed_at":null,"days_open":278,"trust":{"level":"ok","repost_count":1,"flags":["company_stale"],"days_open":277},"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.\nAs 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.\nInternally, 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.\nWith 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.\nLearn more abouthow we use AI in our everyday work. \nAbout the role\nIntegrated into our talented Engineering Team, you’ll work within one of our feature squads on creatinga scalable and efficient product which consistently meets the needs of our clients. You’ll work oncollaborative topics such as designing new features & functionalities, implementation, development and even testing the application.\nTrustpair’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.\n\nThis is a freelance contract, open to candidates based in the EU.\nWhat you'll do:\nTake the lead in creating innovative features by following best practices and maintaining exceptional code quality\n\nEngage in every phase of the SDLC; contribute to the architecture, code development, and even oversee the launch of new releases\n\nSupport critical services for our customers which ensures the security of their payments\n\nKeep 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\n\nChampion 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\n\nWhat’s in it for you \nHigh-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.\n\nShape Our Future: We want your voice in making the critical architectural, product, and organizational decisions that will define our future.\n\nModern 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.\n\nCulture 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.\n\nAccelerated Career Growth: Our rapid expansion creates constant and significant opportunities for career advancement, skill development, and taking on new leadership responsibilities.\n\nCollaborative & 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.\n\nWhy join Trustpair? A full list of our perks here! \nMust-Haves:\n5 years of experience in Ruby (Rails) back end development\n\nAbility to conceive the technical design of a complex product feature\n\nExperience on working on a rapidly growing product; knowledge of architectural models of large scale web applications\n\nExperience working in an Agile environment like Scrum or Kanban\n\nExperience in API development and knowledge of resilience, scalability and security constraints\n\nFluent in English\n\nDesire to work on longer term technical challenges & accomplish them\n\nNice-to-Haves:\nExperience in full stack development (React, Javascript, Typescript...)\n\nDevOps culture, ability to work on deployment pipelines and CI/CD tools like but not limited to: Docker, AWS, GitLab CI\n\nExperience in an environment where security is important; sensitivity to good security practices\n\nExperience in mentoring and leadership of junior and experienced people for good practices of software craftsmanship\n\nExperience with other technologies in high-throughput environments\n\nRecruitment process \nFirst call with Aicha, Talent Acquisition Manager (30 mins)\n\nExperience interview with an Engineering Manager (1h)\n\nCase study with our Tech Lead & an Engineer from our team (1h30)\n\nCoffee fit with a Product Manager & an Engineer (30 mins)\n\nCofounders interview with Alexandre, our MD (45 mins)\n\nEqual Opportunity Statement\nTrustpair'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.\nApplicants 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. 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