Java Engineer - Fintech

Overview
A fast-growing digital payments and financial technology organization is seeking a Senior Backend Software Engineer to join its core platform engineering team. This role focuses on designing, building, and maintaining large-scale payment systems that support millions of users and high transaction volumes.
The successful candidate will work on mission-critical financial applications, contribute to system architecture decisions, and help drive technical excellence across the engineering organization.
This position offers the opportunity to work on highly scalable distributed systems, complex financial business logic, and modern cloud-native technologies while collaborating with experienced engineers across multiple teams.
Key Responsibilities
Platform Development
Design, develop, and maintain backend services, APIs, and batch processing systems.
Build highly available and scalable payment processing platforms.
Develop new product features while ensuring system reliability and performance.
Participate in system architecture reviews and technical design discussions.
Optimize applications for throughput, latency, and operational efficiency.
System Design
Create technical specifications and detailed system designs.
Design database schemas and data processing workflows.
Improve platform scalability and resiliency.
Implement secure and reliable integration patterns between internal and external systems.
Support modernization initiatives and microservices adoption.
Operational Excellence
Monitor production systems and resolve operational issues.
Troubleshoot performance bottlenecks and system failures.
Improve observability through logging, metrics, and monitoring.
Participate in incident response and root-cause analysis activities.
Continuously enhance development and deployment processes.
Technical Leadership
Provide technical guidance and mentorship to engineers.
Conduct code reviews and architectural reviews.
Establish engineering best practices and development standards.
Support knowledge sharing and technical training initiatives.
Drive continuous improvement across engineering teams.
Required Qualifications
5+ years of professional software development experience using Java.
5+ years of experience designing and developing enterprise-scale backend systems.
Strong understanding of software architecture and distributed systems.
Experience working with relational databases and high-volume data processing.
Knowledge of Linux-based production environments.
Familiarity with API design and backend service development.
Experience collaborating within Agile development environments.
Ability to communicate effectively in English in professional settings.
Preferred Qualifications
Experience building financial services, payment platforms, or fintech products.
Experience supporting business-critical production systems.
Knowledge of microservices architecture and cloud-native development.
Experience with container technologies such as Docker and Kubernetes.
Experience designing systems that handle large transaction volumes.
Familiarity with event-driven systems and workflow orchestration.
Knowledge of security, compliance, and reliability requirements in financial environments.
Conversational Japanese language ability is advantageous but not required.
Technical Environment
Languages & Frameworks
Java
PHP
SQL

Work arrangement
No