Lead Java Developer (Brazil)

Mamoru; São Paulo; Presencial; BRL 120.000 - 160.000; Tempo integral

Resumo da oferta

A dynamic global Fintech leader in São Paulo seeks an experienced Senior Java Developer to design mission-critical services for financial infrastructure. The ideal candidate should have 8+ years in Core Java, strong proficiency in payment systems, and experience with RESTful APIs and microservices. This full-time position offers competitive salary and performance-based bonuses, with opportunities for professional growth and compliance with security standards.

Serviços

Competitive salary

Performance-based annual bonus

Growth opportunities within a global fintech leader

Qualificações

• 8+ years’ experience in Core Java for enterprise application development.
• Proficient in Kafka, JPA/MyBatis/Hibernate, and PostgreSQL.
• Hands-on experience building RESTful APIs and WebSocket services.
• Strong analytical, problem-solving, and communication skills.

Responsabilidades

• Design, develop, and maintain high-performance Java microservices for payment processing.
• Implement secure payment and settlement flows, including reconciliation.
• Collaborate with DevOps engineers on containerization and CI/CD pipelines.
• Support compliance with security and regulatory requirements.

Conhecimentos

Core Java

Spring Boot

Kafka

RESTful APIs

PostgreSQL

Docker

Kubernetes

Secure coding practices

Formação académica

Bachelor's degree in computer science or related discipline

Ferramentas

Maven

JUnit 5

Git

Descrição da oferta de emprego

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

1. 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).
2. Implement secure payment and settlement flows, including authorization, posting, reconciliation, and refund logic.
3. Work with event-driven architecture using Kafka and apply event-sourcing design patterns where appropriate.
4. Ensure data integrity and transactional consistency across multiple systems (PostgreSQL, message brokers, and external APIs).
5. Build and maintain RESTful APIs and WebSocket services; implement gRPC integrations when needed.
6. Collaborate with DevOps engineers on containerization (Docker), orchestration (Kubernetes), and CI/CD pipelines.
7. Participate in code reviews, testing, and monitoring improvements to ensure system stability and scalability.
8. Support compliance with security and regulatory requirements, including PCI-DSS, KYC/AML, and Open Banking standards.

Requirements

• 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).

What We Offer:

• Full‑time employment with a formal contract.
• Competitive salary and performance‑based annual bonus.
• Opportunity to grow within a global fintech leader.