$120K - 160K a year
Design and maintain scalable backend payment services and develop optimized frontend user experiences for financial infrastructure.
5+ years full-stack experience with Kotlin, React, Next.js, SQL databases, cloud architectures, microservices, and strong communication skills.
Description: • The Role: We are looking for a Senior Full-Stack Engineer to join the Revenue Engine Squad in the Marketplace Zone. This role is ideal for a well-rounded engineer who is comfortable navigating both backend and frontend development. On the backend, you’ll play a critical role in designing scalable, resilient services that power our financial infrastructure. On the frontend, you’ll build intuitive, high-performing user experiences for payment, wallet, account management. • Responsibilities: • Design, develop, and maintain scalable backend services for payment processing, pricing, and refunds. • Integrate payment gateways and 3rd party integrations. • Develop and optimize user-facing features, such as wallet, credits, payments experiences. • Optimize payment success rates by improving retry mechanisms, fraud detection, and error handling. • Develop and implement features to support promotions, subscriptions, and order finalization workflows. • Work on multi-currency support and international payment processing. • Define and uphold engineering best practices in security, scalability, performance, and code quality. • Improve the maturity of our technical stack through engineering best practices and process automation. • Monitor and enhance system performance. • Participate in code reviews, mentorship, and technical decision-making. • Collaborate with cross-functional teams including finance, legal, and security to ensure compliance and fraud prevention. Requirements: • 5+ years of experience in frontend and backend development, with expertise in Kotlin, React, Next.js, and SQL databases. • Experience designing and building scalable cloud-based architectures and distributed systems. • Expertise in service-oriented architectures, API design, and microservices development. • Strong knowledge of database design, implementation, and query optimization. • Experience with system performance monitoring, logging, and observability. • Ability to write clean, maintainable, and testable code. • Advanced level of English with strong communication skills, both verbal and written. Benefits: • Get paid in USD. • Work remotely: design the life that you want. • Enjoy 15 business days of vacation each year from the start date. • 16 fully paid Argentinean holidays. • Healthcare Benefit: Monthly stipend to use in your preferred healthcare provider. • 5-year Sabbatical: After 5 years with CookUnity, you get a 4-week paid sabbatical. • Paid family leave. • Compassionate Leave: 3-5 days each time the need arises. • Customize the benefits that suit your needs! Access a range of perks tailored to you, including learning opportunities, wellness memberships, delivery apps, and more through our comprehensive benefit platform. • Personalized English coach.
This job posting was last updated on 8/29/2025