Java Middleware Engineer - FinTech Payments & Scale

Okto Payments; Buenos Aires; Híbrido; ARS 2.500.000 - 4.500.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Birthday Leave

Competitive Compensation

Career Growth

Continuous Learning

Inclusive Environment

Descripción de la vacante

OKTO is hiring a Java Middleware Engineer to design, develop, and maintain middleware services powering our next‑generation payment platform. You will work with Product, Architecture, Infrastructure, QA, and Security teams to deliver scalable, secure, high‑performance applications processing millions of transactions.

The role requires advanced English and Spanish, 5+ years in Java middleware, and strong Spring Boot/Spring Cloud experience within FinTech.

Formación

• Bachelor's degree in Computer Science, Computer Engineering, Software Engineering, Information Technology, or a related field.
• 5+ years of professional experience developing middleware or backend applications using Java.
• At least 1 year of hands-on experience with Java 11 or newer.
• Proven experience in FinTech, Payments, Banking, or Financial Services.
• Strong understanding of OOD, SOLID, and Functional Programming concepts.
• Experience designing microservices with Spring Boot and Spring Cloud (Netflix OSS).
• Solid knowledge of the Spring Framework 5 ecosystem.
• Experience implementing OAuth2 authentication/authorization.
• Experience with JPA, ORM modeling, and persistence frameworks.
• Strong experience designing and developing RESTful APIs.
• Familiarity with Event-Driven Architecture and distributed design patterns.
• Git and collaborative source control workflows.
• Good understanding of software development best practices, including unit testing and clean code.

Responsabilidades

• Design, develop, and maintain middleware applications and backend services using Java and Spring technologies.
• Develop new product features and platform capabilities based on business and technical requirements.
• Build scalable, resilient, and high‑performance microservices that support payment processing and financial transaction workflows.
• Write clean, maintainable, and performance‑optimized code with comprehensive unit test coverage.
• Participate in the design and implementation of distributed systems and event‑driven architectures.
• Develop and maintain RESTful APIs and secure service integrations using OAuth2.
• Support SIT, UAT, and Production environments, identifying and resolving issues to ensure platform stability.
• Collaborate with cross‑functional teams to deliver high‑quality software solutions.
• Participate in Agile ceremonies, code reviews, and knowledge-sharing initiatives.
• Contribute to continuous improvement by optimizing software quality and performance.
• Work with Git and CI/CD pipelines, following engineering best practices.
• Produce technical documentation and design/implementation details.

Conocimientos

Advanced English

Analytical thinking

Troubleshooting

Technical writing

Independent worker

Educación

Bachelor's degree in Computer Science/Engineering/IT

Herramientas

Git

CI/CD

Descripción del empleo

OKTO is hiring a Java Middleware Engineer to design, develop, and maintain middleware services powering our next‑generation payment platform. You will work with Product, Architecture, Infrastructure, QA, and Security teams to deliver scalable, secure, high‑performance applications processing millions of transactions.

The role requires advanced English and Spanish, 5+ years in Java middleware, and strong Spring Boot/Spring Cloud experience within FinTech.