Mid-Senior Java Software Engineer (Remote - Argentina) - ARG112-DV

Okto Payments; Buenos Aires; Hybride; ARS 136 428 000 - 181 904 000; Plein temps

Résumé du poste

OKTO is seeking a Java Middleware Engineer to design, develop, and maintain middleware services powering our next-generation payment platform. You will contribute to scalable, secure, high-performance applications that process millions of transactions, collaborating with Product, Architecture, Infrastructure, QA and Security teams.

You will work with Java, Spring Boot, Spring Cloud, OAuth2, and RESTful APIs, building distributed systems and ensuring robust CI/CD.

Qualifications

• Bachelor's degree in Computer Science, Computer Engineering, Software Engineering, IT, or related field.
• 5+ years of professional middleware/backend Java experience.
• At least 1 year with Java 11+.
• Experience in FinTech, Payments, Banking, or Financial Services.
• Strong OOD/SOLID and functional programming understanding.
• Spring Boot and Spring Cloud (Netflix OSS) experience.
• Spring Framework 5 ecosystem knowledge.
• OAuth2 authentication/authorization experience.
• JPA, ORM modeling, persistence experience.
• RESTful API design experience.
• Event-driven architecture and distributed design patterns.
• Git and collaborative workflows.
• Unit testing, clean code, and code review practices.
• Analytical and problem-solving skills.
• Ability to work independently with international teams.
• Technical writing for requirements and designs.

Responsabilités

• Design, develop, and maintain middleware applications and backend services using Java and Spring.
• Develop new features and platform capabilities based on business and technical requirements.
• Build scalable, resilient microservices for payment processing.
• Write clean, maintainable, unit-tested code with performance in mind.
• Participate in distributed systems and event-driven architectures.
• Develop and maintain RESTful APIs and secure integrations with OAuth2.
• Support SIT, UAT, and Production environments for platform stability.
• Collaborate with Product, Architecture, Infrastructure, QA, and Security teams.
• Participate in Agile ceremonies and code reviews.
• Drive continuous improvement in software quality and performance.
• Work with Git and CI/CD pipelines following best practices.
• Produce technical documentation and design specifications.

Connaissances

Java

Spring Boot

Spring Cloud

RESTful APIs

Microservices

OAuth2

Object-oriented design

Unit testing

Formation

Bachelor's degree in Computer Science, Computer Engineering, Software Engineering, IT or related field

Outils

Git

JPA/Hibernate

CI/CD

AWS

Description du poste

OKTO’s continuous growth demands high-caliber candidates who embody professionalism, passion, and creativity. For those who join us, we offer significant career advancement, stimulating challenges, and a clear runway for growth.

OKTO is the next-generation Payment Service Provider — AI-native, precision-engineered, and relentlessly merchant-obsessed. Built for merchants operating in the most complex and demanding eCommerce sectors, our platform goes far beyond transaction processing. We solve for scale, compliance, and performance with one unshakable focus: delivering outcomes that power merchant growth.

From payments and banking to treasury and settlement, we engineer the financial infrastructure that gives our partners a competitive edge. The result? Faster onboarding, smarter operations, and resilient, real-time performance.

At OKTO, we enable merchants to Play Differently, transforming payments from routine transactions into true differentiators that deliver personalized, frictionless experiences.

Our AI-native innovation harnesses data and insight to power every decision, while our proprietary in-house engineering ensures precision and control. Combined with deep, trust-based relationships worldwide, we’re redefining what it means to build, scale, and win in complex digital commerce.

Summary

As a Java Middleware Engineer, you will play a key role in designing, developing, and maintaining the middleware services that power our next-generation payment platform. You will contribute to the development of scalable, secure, and high-performance applications that process millions of financial transactions, while collaborating with Product, Architecture, Infrastructure, QA, and Security teams.

Key Responsibilities

• 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, ensuring high-quality standards and 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 modern authentication mechanisms such as OAuth2.
• Support System Integration Testing (SIT), User Acceptance Testing (UAT), and Production environments, identifying and resolving issues to ensure platform stability.
• Collaborate with cross-functional teams, including Product Managers, QA Engineers, DevOps Engineers, and Solution Architects, to deliver high-quality software solutions.
• Participate in Agile ceremonies, code reviews, technical discussions, and knowledge-sharing initiatives.
• Contribute to continuous improvement by identifying opportunities to optimize software quality, development processes, and system performance.
• Work with version control systems and CI/CD pipelines, following engineering best practices and software development standards.
• Produce technical documentation, including product specifications, design documentation, and implementation details.

• Bachelor's degree in Computer Science, Computer Engineering, Software Engineering, Information Technology, or a related field.
• Minimum of 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 working within the FinTech, Payments, Banking, or Financial Services industry.
• Strong understanding of Object-Oriented Design (OOD), SOLID principles, and Functional Programming concepts.
• Experience designing and developing microservices architectures using Spring Boot and Spring Cloud (Netflix OSS).
• Solid knowledge of the Spring Framework 5 ecosystem.
• Experience implementing secure authentication and authorization using OAuth2.
• Experience with JPA, ORM modeling, and persistence frameworks.
• Strong experience designing and developing RESTful APIs.
• Familiarity with Event-Driven Architecture, asynchronous messaging, and distributed software design patterns.
• Experience working with Git and collaborative source control workflows.
• Good understanding of software development best practices, including unit testing, clean code principles, and code review processes.
• Strong analytical, problem-solving, and troubleshooting skills.
• Ability to work independently while collaborating effectively within an international engineering team.
• Excellent technical writing skills for documenting requirements, software designs, and technical specifications.

Preferred Qualifications

• Experience with cloud platforms such as AWS.
• Familiarity with CI/CD pipelines and DevOps practices.
• Experience working in high-volume transaction processing environments.
• Knowledge of payment processing concepts, transaction lifecycle, settlement, reconciliation, or payment gateway integrations.
• Experience with monitoring, logging, and application performance optimization.

Languages

• Advanced English (mandatory), with the ability to participate in technical discussions, collaborate with international teams, and produce technical documentation.
• Spanish (mandatory).

• Competitive Compensation - Competitive salary package.
• Career Growth - Career development opportunities in a growing global fintech.
• Continuous Learning - Access to challenging projects and continuous learning opportunities.
• Inclusive Environment - Collaborative, diverse, and international work environment.
• Birthday Leave - Paid day off on your birthday.