Back End Developer

Job descriptionTransFi’s purpose is to power the world’s payments, helping businesses and individuals access better ways to move money. Combining industry-leading coverage of currencies and payment methods, we deliver compliant payouts, collections, and ramp services across Asia, Europe, LatAm, Africa, and North America. In our pursuit to advance economic prosperity through borderless finance, TransFi’s enterprise-grade, developer-friendly platform is quietly transforming global payments—making international money movement faster, less expensive, and more reliable than ever.Trans-Fi is remote first; we believe the best talent comes from all over the world. Our team is distributed over multiple countries and continents. We are building for the long term and look for strong owners, builders and big thinkers. Join us if you want to build the future of global financeWhat You’ll DoDesign & Implement Payment Systems Architect and build scalable, reliable payment flows (checkout, refunds,subscriptions).Integrate with PSPs and maintain PCI-compliant practices.Build & Maintain Front-EndDevelop performant, accessible React components in a Vite/CRA environmentEnsure great UX across devices and handle complex client-side state/data concernsDrive Security Best PracticesIdentify, remediate, and prevent security ulnerabilities (OWASP Top 10, JWT management, CORS, CSP)Conduct regular threat modeling and code reviews with a security lensEnsure Quality Through TestingWrite and maintain unit and integration tests (Jest, Vitest, React TestingLibrary)Collaborate on E2E test suites (Playwright, Cypress) to validate critical flowsOwn Your DeliverablesTake full lifecycle ownership—from scoping and estimation through deployment and monitoringProactively identify and solve production issues, implement observability (logs, metrics, alerts)Document ThoroughlyProduce clear API specs, README updates, onboarding guides, and architectural diagramsKeep internal Wikis and Confluence pages up to dateWhat We’re Looking ForExperience:5+ years in full-stack JavaScript development (MERN: MongoDB, Express,React, Next.js, Node.js)Hands-on with payment gateways and transaction lifecycle designTechnical Skills:Strong proficiency in React (hooks, context, performance optimization)Deep understanding of Node.js back-end patterns (RESTful APIs, middleware, error handling)Solid database design and querying expertise with MongoDB (aggregation,indexing, replication)Quality & Security:Proven track record writing comprehensive unit tests (Jest/Vitest) and integration testsFamiliarity with security best practices: authentication, authorization, encryption, OWASP mitigationsSoft Skills:Exceptional ownership mentality—you drive features from concept to productionExcellent written communication and documentation skillsCollaborative mindset: you enjoy pairing, code reviews, and knowledge sharingNice-to-HavesExperience with TypeScript across front-end and back-endFamiliarity with containerization (Docker) and cloud deployments (AWS/GCP)Background in microservices or event-driven architecturesExposure to CI/CD pipelines and infrastructure as codeWhy Join Us?Impact: Your work will power critical payment flows for thousands of users every day.Growth: Strong mentorship, bi-weekly tech talks, and training stipends.Flexibility: Work remotely.Culture: A supportive team that values autonomy, learning, and continuousimprovement.