✦ Luna Orbit — Software Engineering

Backend Engineer (Java) / バックエンドエンジニア (Java) (New Bank Project)

at PayPay

📍 Hybrid Hybrid Posted March 27, 2026
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Position Details

Type Full-Time
Experience mid
Exp. Years Not specified
Education Not specified
Category Software Engineering

About this role

This role involves developing and maintaining backend applications for core banking systems using Java and Kotlin, ensuring high performance and reliability in a fintech setting.

Key Responsibilities

  • Develop and operate backend applications in Java/Kotlin
  • Design for performance and stability
  • Utilize infrastructure effectively
  • Implement monitoring and alert systems
  • Design system architecture

Technical Overview

The technical environment includes Java and Kotlin programming, microservices architecture, system performance tuning, infrastructure utilization, and system monitoring tools.

Ideal Candidate

The ideal candidate is a mid-level backend engineer with experience in Java and Kotlin, specializing in microservices architecture, performance optimization, and system design within fintech environments.

Must-Have Skills

JavaKotlinBackend application developmentPerformance tuningSystem architecture

Nice-to-Have Skills

MicroservicesMonitoring toolsAlert responseInfrastructure understanding

Tools & Platforms

JavaKotlinMicroservices architectureMonitoring tools

Required Skills

JavaKotlinMicroservicesPerformance tuningSystem architectureBackend developmentMonitoringAlert response

Hard Skills

JavaJava/KotlinMicroservicesPerformance tuningSystem architectureInfrastructure utilizationMonitoringAlert response

Soft Skills

CollaborationProblem-solvingCommunicationAdaptabilityTeamwork

Industry & Role

Industry Fintech
Job Function Backend application development and system architecture design for banking systems
Role Subtype Backend Engineer
Tech Domains Java, Kotlin, Microservices, System Architecture, Monitoring

Keywords for Your Resume

JavaKotlinMicroservicesPerformance tuningSystem architectureBackend developmentFinancial systemsMonitoringAlert responseInfrastructure utilizationJava/KotlinMicroservices architecturePerformance optimizationSystem designMonitoring toolsInfrastructure

Deal Breakers

Lack of Java or Kotlin experience, No experience with microservices, No background in financial systems, Unwillingness to work in a hybrid environment

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