Senior Software Engineer Backend-Payments & Architecture

Summary

Join OKTO, a company powering digital payments, as a Senior Backend Engineer in their fully remote Argentina team. Lead the design and development of scalable Java-based payment systems in a high-transaction environment. This key role shapes OKTO’s next-generation payment platform, offering strong growth potential and global impact. Responsibilities include leading the design and architecture of complex distributed systems, integrating payment gateways, transitioning to a microservices architecture, creating and maintaining high-quality code, providing technical leadership, collaborating with cross-functional teams, driving continuous improvement, and collaborating with DevOps. The position requires a Bachelor’s or Master’s degree in Computer Engineering or a related field, 7+ years of backend software development experience (3+ years leading teams and architecting payment systems), and strong understanding of payment flows and technologies. OKTO offers a competitive remuneration package.

Requirements

• Excellent academic background: Bachelor’s or Master’s degree in Computer Engineering or a related field
• Proven experience (7+ years) in backend software development, with at least 3 years leading teams and architecting payment systems
• Strong understanding of payment flows, settlement, reconciliation, and fraud detection mechanisms
• Deep knowledge of Java 11+, Spring Boot
• Strong experience with AWS cloud services, including IAM, EC2, S3, Lambda, RDS, DynamoDB, and API Gateway
• Hands-on experience with transaction management, database tuning (PostgreSQL, MySQL, or NoSQL stores), and high-availability strategies
• Extensive experience with Event-Driven Software Design Patterns and complex systems architecture
• Expertise in microservices architecture, specifically with Java 8+, Spring Boot, Spring Cloud (Netflix OSS), OAuth2 Security, and JPA ORM
• Expertise in designing secure RESTful APIs and working with OAuth2, JWT, and SSO mechanisms
• Advanced proficiency in Git for source control and versioning
• Strong technical writing skills, with the ability to produce clear and concise technical requirements, design documents, and specifications
• A proven ability to communicate complex technical concepts effectively in English

Responsibilities

• Leading the design and architecture of complex distributed systems that handle real-time financial transactions at scale
• Spearheading the integration of payment gateways, banks, card networks, and alternative payment methods
• Taking a lead role in our transition to a microservices-based architecture for payments
• Creating and maintaining high-quality, optimized code with robust unit tests and appropriate test coverage
• Providing technical leadership, mentoring junior developers, and guiding the team in best practices and efficient coding techniques
• Collaborating with cross-functional teams to deliver highly scalable, performant solutions
• Driving continuous improvement initiatives, identifying bottlenecks, and optimizing the software development lifecycle
• Collaborating with DevOps to optimize CI/CD pipelines, and monitoring strategies for production systems

Benefits

• Competitive remuneration package tailored to your experience
• Competitive Compensation
• Modern Equipment
• Career Growth
• Continuous Learning
• Inclusive Environment
• Work-from-home