Fullstack Engineer - Remote

About The CompanyDeuna is a rapidly growing startup revolutionizing global commerce with ATHIA, our AI-powered orchestration and payments platform that helps large enterprises boost approval rates, reduce costs, and unlock new revenue. Built by the team behind Deuna—the fastest-growing Commerce Operating System (OS) in Latin America—ATHIA combines payment intelligence, checkout optimization, and data orchestration into a comprehensive solution. With deep integrations across over 300 Payment Service Providers (PSPs) and alternative payment methods, and more than 20% of Mexico’s digital economy running through our platform, we simplify global payments through a single integration and centralized reconciliation.As we expand into the U.S., Deuna is committed to meeting the urgent needs of large retailers, marketplaces, airlines, and quick-service restaurants. Join us in shaping the future of payments and transforming how businesses operate in the digital economy.About The RoleWe are seeking a Fullstack Staff Engineer to serve as a senior technical authority within our engineering organization. This role is tailored for a highly experienced engineer who operates at a strategic level, influencing architecture, driving technical standards, and solving complex cross-domain problems. Unlike a managerial position, this role does not focus on people management but emphasizes technical leadership, architectural guidance, and long-term scalability.The ideal candidate will thrive in a fast-paced startup environment with high autonomy, where technical decisions directly impact product and business outcomes. You will act as a technical leader and architectural reference, collaborating across multiple teams to ensure system reliability, scalability, and engineering excellence. Your contributions will shape the technical direction of Deuna’s platform, enabling us to deliver innovative payment solutions at scale.QualificationsExtensive experience as a Senior Engineer, Principal Engineer, or Staff Engineer in fullstack environmentsStrong frontend expertise in React, Next.js, and TypeScriptProficiency in backend development with Golang and/or PythonDeep understanding of designing distributed systems and scalable APIsSolid knowledge of data structures, algorithms, design patterns, and system architectureExperience with AWS and cloud-native architecturesProficiency with SQL and NoSQL databasesExcellent debugging, refactoring, and performance optimization skillsStrong written and verbal communication skills in English (fluency required); Spanish is a plusExperience in payments, fintech, e-commerce, or transaction-heavy platforms is advantageousExperience designing high-availability financial systems and working in regulated environments is a plusResponsibilitiesDefine and evolve the fullstack architecture across frontend and backend systems to ensure scalability, performance, and maintainabilityLead complex system design initiatives, establishing technical standards and best practicesContribute directly to critical parts of the codebase, writing scalable, production-ready, and well-tested codeReview code and provide deep technical guidance to engineering teamsLead major refactors and performance optimizations to improve system efficiencyPartner with Product and Engineering leaders to evaluate trade-offs related to scalability, security, cost, and speedDesign APIs, database schemas, caching strategies, and distributed systems architectureGuide teams in handling edge cases, failure scenarios, and observability to ensure system robustnessIdentify architectural bottlenecks and propose scalable solutions to improve system performanceEvaluate new technologies and frameworks to enhance platform capabilitiesImprove system monitoring, instrumentation, and reliability practices across teamsBenefitsGenerous vacation policies and additional paid time offRemote work flexibility from anywhereFinancial support for health insurance, internet, and mobile phone expensesStock options as part of ownership in DeunaAccess to a learning and development platform for continuous growthWork within a multidisciplinary, diverse, and dynamic teamClear growth and career advancement opportunitiesBe part of a high-impact solution that influences the regional digital economyUse of cutting-edge tools and technology to operate efficientlyParticipation in a vibrant startup culture focused on innovation and agilityEqual OpportunityDeuna is proud to be an equal opportunity employer. We value and celebrate diversity and inclusion in our workplace. All employment decisions at Deuna are made without discrimination based on nationality, race, ethnicity, religion, gender, sexual orientation, gender identity or expression, marital status, color, disability, or any other characteristic protected by law.