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Senior FullStack Software Engineer- React & Ruby on Rails (Remote - US) at Jobgether. This position is posted by Jobgether on behalf of Versapay. We are currently looking for a Senior FullStack Software Engineer – React & Ruby on Rails in United States.. This role offers an exciting opportunity to design and develop modern, high-quality software that directly impacts business operations and user experience. As a Senior FullStack Software Engineer, you will contribute to both frontend and backend development, collaborating with cross-functional teams to deliver scalable and secure solutions. You will participate in architectural decisions, mentor peers, and help shape the evolution of the platform. This position is ideal for engineers who thrive in a fast-paced, collaborative environment and enjoy tackling complex technical challenges with innovative solutions.. . Accountabilities. In this role, you will:. . Design, develop, and maintain fullstack features across the platform using React and Ruby on Rails.. . Collaborate with Product Managers, QA, DevOps, and Customer Care teams to define, scope, and implement new features.. . Participate in code reviews, architecture discussions, and technical decision-making processes.. . Investigate and resolve performance, scalability, security, and data integrity issues.. . Contribute to research and development efforts to ensure the platform is scalable, reliable, and secure.. . Mentor junior engineers and foster a culture of continuous learning and improvement.. . Apply agile best practices, iterative planning, and test-driven development to deliver high-quality software efficiently.. . To succeed in this position, you should bring:. . 7+ years of experience in software engineering with a solid foundation in computer science, engineering, or mathematics.. . Proven experience building and shipping fullstack SaaS applications in an agile, test-driven environment.. . Expertise in React.js and modern JavaScript/TypeScript development.. . Experience with Ruby on Rails, or the ability and willingness to learn quickly.. . Strong understanding of algorithms, data structures, and system design principles.. . Excellent debugging and problem-solving skills in complex or ambiguous situations.. . Strong communication skills, both written and verbal, and a collaborative mindset.. . Experience in the Payments industry and/or knowledge of PCI/DSS compliance is a plus.. . Company Location: United States.