Lead Java Developer (Brazil)
MamoruBrazil19 days ago
Full-timeEngineering, Information Technology
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Location: São Paulo, Brazil
About Mamoru:
Mamoru is a dynamic global Fintech Payments group. Our goals are to provide an all-rounded solution to facilitate the easiest access to finance and asset management products with our state-of-the-art technology powered by blockchain and global coverage. The team is a group of talents from technology, market making and venture capital backgrounds.
Role Summary:
We are seeking an experienced Senior Java Developer with strong expertise in
payment systems and banking API integration. The successful candidate will design
and build mission-critical services that power our financial infrastructure including digital wallets, real-time settlements, reconciliation processes, and bank connectivity. You will collaborate closely with product compliance, and DevOps teams to ensure high availability, performance, and regulatory compliance across our platform.
Key Responsibilities
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About Mamoru:
Mamoru is a dynamic global Fintech Payments group. Our goals are to provide an all-rounded solution to facilitate the easiest access to finance and asset management products with our state-of-the-art technology powered by blockchain and global coverage. The team is a group of talents from technology, market making and venture capital backgrounds.
Role Summary:
We are seeking an experienced Senior Java Developer with strong expertise in
payment systems and banking API integration. The successful candidate will design
and build mission-critical services that power our financial infrastructure including digital wallets, real-time settlements, reconciliation processes, and bank connectivity. You will collaborate closely with product compliance, and DevOps teams to ensure high availability, performance, and regulatory compliance across our platform.
Key Responsibilities
- Design, develop, and maintain high-performance Java microservices for payment processing and financial transactions. Integrate with banking APIs, PSPs, and payment gateways (e.g., SWIFT, FPS, SEPA, VISA/MASTERCARD, or local clearing systems)
- Implement secure payment and settlement flows, including authorization, posting, reconciliation, and refund logic
- Work with event-driven architecture using Kafka and apply event-sourcing design patterns where appropriate
- Ensure data integrity and transactional consistency across multiple systems (PostgreSQL, message brokers, and external APIs)
- Build and maintain RESTful APIs and WebSocket services; implement gRPC integrations when needed
- Collaborate with DevOps engineers on containerization (Docker), orchestration (Kubernetes), and CI/CD pipelines.
- Participate in code reviews, testing, and monitoring improvements to ensure system stability and scalability
- Support compliance with security and regulatory requirements, including PCI-DSS, KYC/AML, and Open Banking standards
- 8+ years’ experience in Core Java for enterprise application development, with strong knowledge of Spring Boot, Spring Cloud, and event sourcing
- Proficient in Kafka, JPA/MyBatis/Hibernate, Maven, and PostgreSQL (schema design, query optimization, data migration)
- Hands-on experience building RESTful APIs, WebSocket services, and familiarity with gRPC, Docker, Kubernetes, and microservice architectures
- Skilled in JUnit 5, Mockito, and writing maintainable test suites
- Good understanding of Git, CI/CD pipelines, and OAuth 2.0/OpenID Connect
- Experience in financial systems, banking integrations, or payment platforms is highly valued; knowledge of double-entry accounting or reconciliation is a plus
- Exposure to cloud platforms (AWS, GCP, or Azure) and contribution to open-source projects is an advantage
- Strong analytical, problem-solving, and communication skills, with a commitment to clean code, testing, and continuous improvement
- Self-motivated, detail-oriented, and able to work independently or collaboratively in a fast-paced environment
- Bachelor’s degree in computer science, Software Engineering, or related discipline; fluent in English (spoken and written)
- Full-time employment with a formal contract
- Competitive salary and performance-based annual bonus
- Opportunity to grow within a global fintech leader
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Key Skills
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