Job Description

Tokyo, Japan | Full Remote | ⚡ Functional Programming Excellence

Transform Digital Payments with Functional Programming

Join our dynamic engineering team building next-generation payment gateway solutions that power thousands of merchants across Japan's diverse payment ecosystem. Our proprietary platform seamlessly integrates credit card processing with QR payment systems and bank transfers, creating unified experiences for businesses of all sizes.

✨ What Sets This Role Apart

Engineering Excellence & Autonomy

Lead technical decisions in a flat organization where your voice shapes product direction
Work with production systems processing real transactions at scale
Collaborate in high-performing teams without corporate bureaucracy
Direct access to leadership for proposing improvements and driving initiatives

Career Growth & Impact

Expand functional programming expertise with industry-leading mentorship
Take ownership of entire system components from conception to deployment
Contribute to architectural decisions for large-scale distributed systems
Work across diverse technical challenges beyond traditional API development

⚖️ Work-Life Integration

Complete location flexibility with full remote capabilities
Flexible scheduling respecting your optimal productivity hours
Strong retention culture - many engineers return for the autonomy and impact

️ Core Responsibilities

️ Design resilient, scalable backend services for cloud-native payment processing
Implement robust API systems serving high-volume transaction flows
Participate in code reviews and mentor team members
Drive continuous improvement initiatives across development workflows
Collaborate with cross-functional teams to deliver integrated solutions

✅ Required Qualifications

Technical Foundation

3+ years of object-oriented programming experience
1+ years of functional programming experience (Scala, Java, Kotlin preferred)
Strong API development and web service architecture background
Proficiency with relational database systems and query optimization
Experience with Git-based version control and collaborative development
Proven track record developing comprehensive automated test suites
Computer Science degree or equivalent technical background

Valuable Additional Skills

Event-driven architecture and messaging system implementation
️ NoSQL database design and AWS cloud services experience
Microservices design patterns and CI/CD pipeline development
Financial services domain knowledge
Open source contribution history
️ Conversational Japanese ability for enhanced team collaboration

Why Choose Us

Technical Innovation

Work on systems processing real financial transactions at scale
Contribute to entirely in-house developed technology stack
Influence architectural decisions impacting thousands of merchants
Access cutting-edge functional programming practices

Professional Growth

Transition from larger corporate environments to high-impact startup culture
Direct involvement in feature planning and business strategy discussions
Exposure to complete product development lifecycle
Join a community of developers who specifically returned for our collaborative environment

Ref No.: 06940-0013260806

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