Mid-Level Java Software Engineer (BRAZIL)

OKTO’s continuous growth demands high-caliber candidates who can demonstrate professionalism, passion, and creativity. For those who come on board, we offer significant career advancement, challenges, and a runway for growth.

OKTO powers digital payments for every entertainment, leisure, and gaming environment. Our unified payment platform combines secure, real-world transactions with the most powerful payment technology to create immersive payment experiences for both merchants and their users.

Since 2019, OKTO has been improving payment interactions for online and retail gaming and introducing frictionless payments with its local knowledge, sector expertise, and international capabilities.

The expanding business now employs over 200 payment experts, gaming insiders, and software engineers, serving some of the most exciting international markets, including Brazil, Romania, Italy, Greece, Germany, the UK, and Spain.

Summary

As a Software Engineer, you will play a key technical leadership role in architecting, designing, and developing our next-generation payment platform. This position requires deep expertise in distributed systems, Java-based microservices, and high-volume transaction processing. You will be responsible for ensuring the platform meets the highest standards of scalability, security, and reliability while working closely with product, infrastructure, and security teams.
This position offers tremendous career growth and the opportunity to make a direct impact in a rapidly expanding international company.

Your responsibilities will include:

• Contribute to the development and maintenance of distributed systems, focusing on stability and performance in environments that handle real-time financial transactions.
• Participate in the integration of payment gateways, banks, and other payment methods, under the guidance of senior developers or architects.
• Assist in the implementation and maintenance of a microservices-based architecture, following guidelines set by the architecture team.
• Write and maintain clean and efficient code, including unit tests with good coverage, in accordance with team standards.
• Collaborate with team members in code reviews and best practices, continuously seeking technical growth and knowledge sharing.
• Work closely with cross-functional teams, contributing to technically sound deliverables focused on scalability and performance.
• Support continuous improvement initiatives, reporting recurring issues, suggesting enhancements, and helping to optimize development workflows.
• Collaborate with the DevOps team in using CI/CD pipelines and monitoring tools, adhering to established best practices.

Requirements

• The professional must be located in Brazil.
• Native Portuguese speaker.
• Solid academic background: Bachelor’s degree in Computer Engineering, Computer Science, or a related field.
• Hands-on experience in backend software development, preferably in the financial or payments domain.
• Basic understanding of payment processing concepts such as payment flows, settlement, and reconciliation.
• Proficiency in Java (Java 8+), with experience using Spring Boot for backend development.
• Familiarity with AWS cloud services such as EC2, S3, RDS, or Lambda is a strong plus.
• Experience with relational databases (e.g., PostgreSQL or MySQL), including basic query optimization and transaction management.
• Understanding of event-driven architecture concepts and asynchronous communication patterns.
• Exposure to microservices architecture and tools like Spring Cloud, OAuth2, and JPA.
• Experience in building RESTful APIs and working with authentication mechanisms like OAuth2 or JWT.
• Good working knowledge of Git for version control in collaborative environments.
• Ability to document code, write simple technical specs, and follow software design guidelines.
• Advanced english communication skills, with the ability to participate in technical discussions and read documentation.

Benefits

• Competitive remuneration according to your experience.
• Opportunity to work in a fast-paced company.
• Food voucher.
• Health insurance.