Fullstack Engineer

About the job

About The Company

DEUNA is a rapidly growing startup revolutionizing global commerce with its innovative ATHIA platform. ATHIA is an AI-powered orchestration and payments solution designed to help large enterprises enhance approval rates, reduce operational costs, and unlock new revenue streams. Built by the team behind DEUNA, Latin America's fastest-growing Commerce Operating System (OS), ATHIA seamlessly integrates payment intelligence, checkout optimization, and data orchestration into a single, powerful platform. With deep integrations across over 300 Payment Service Providers (PSPs) and alternative payment methods, DEUNA simplifies global payments through a single integration point and centralized reconciliation. Currently expanding into the U.S., DEUNA aims to meet the evolving needs of large retailers, marketplaces, airlines, and quick-service restaurants. Join us to shape the future of payments and be part of a high-impact, innovative team.

About The Role

We are seeking a Fullstack Staff Engineer to serve as a senior technical authority within our engineering organization. This role is ideal 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 and architectural guidance. You will act as a technical reference across multiple teams, ensuring long-term scalability, reliability, and engineering excellence. The role offers the opportunity to thrive in a fast-paced startup environment with high autonomy, where technical decisions have a direct impact on product development and business growth. You will collaborate closely with product and engineering leaders to design scalable, high-performance systems, and contribute to critical parts of our codebase, shaping the future of our payments platform.

Qualifications

• Extensive experience as a Senior Engineer, Principal Engineer, or Staff Engineer in fullstack development.
• Proficiency in frontend technologies: React, Next.js, and TypeScript.
• Strong backend experience with Golang and/or Python.
• Deep understanding of designing distributed systems and scalable APIs.
• Solid knowledge of data structures, algorithms, design patterns, and system design trade-offs.
• Experience with AWS and cloud-native architectures.
• Proficiency with SQL and NoSQL databases.
• Excellent debugging, refactoring, and performance optimization skills.
• Strong written and verbal communication skills in English; fluency or proficiency in Spanish is a plus.
• Ability to operate independently and collaboratively in a dynamic environment.

Responsibilities

• Define and evolve the fullstack architecture across frontend and backend systems to ensure scalability, performance, and maintainability.
• Lead complex system design initiatives, establishing technical standards and best practices.
• Drive technical alignment across multiple teams, ensuring consistency and quality in implementation.
• Contribute directly to critical parts of the codebase, writing scalable, production-ready, and well-tested code.
• Lead major refactors and performance optimizations to improve system efficiency.
• Review code and provide deep technical guidance to engineering teams.
• Collaborate with product and engineering leaders to evaluate trade-offs related to scalability, security, cost, and speed.
• Design APIs, database schemas, caching strategies, and distributed systems to support platform growth.
• Guide teams in handling edge cases, failure scenarios, and observability to ensure system resilience.
• Identify architectural bottlenecks and propose scalable solutions to improve system performance.
• Evaluate new technologies and frameworks to enhance system capabilities and maintain technological relevance.
• Improve system monitoring, instrumentation, and reliability practices to ensure high availability and robustness.

Benefits

• Vacations and additional paid time off (PTO).
• Remote work flexibility from anywhere.
• Financial support for health insurance, internet, and mobile phone expenses.
• Equity ownership through stock options.
• Access to a learning and development platform for continuous growth.
• Opportunity to work within a multidisciplinary, diverse, and dynamic team.
• Clear growth and career development pathways.
• Be part of a startup culture that values innovation, agility, and impact.

Equal Opportunity

DEUNA 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. We are committed to fostering an inclusive environment where everyone can thrive and contribute to our shared success.