Backend Engineer

• Senior Product Engineer, Backendとしての行動を期待され、仕様策定からデリバリーの完遂に一気通貫で責任を持つ
• 定義フェーズから主体的に踏み込み、プロダクトスペックの具体化・合意形成・品質/計測の成立・リリースまで自律的にリードする
• GoによるMicroserviceおよびAPIの設計・開発・運用
• Protocol Buffers + gRPC を用いたマイクロサービス間のI/F設計
• アプリケーション要件に基づいたアーキテクチャの設計、ミドルウェアの選定
• マイクロサービスのパフォーマンスチューニング、モニタリング、アラート対応を通じたシステムの信頼性向上
• ユーザーの行動ログなどの定量的・定性的な分析による施策の効果測定とサービス改善
• 決済、与信、会計、本人確認（KYC）領域における複雑なドメイン課題に対する高い正確性と拡張性を両立したシステム設計

Senior Product Engineer, Backend

• GoによるMicroservice（マイクロサービス）およびAPIの設計・開発・運用
• Protocol Buffers + gRPC を用いたマイクロサービス間のI/F設計
• アプリケーション要件に基づいたアーキテクチャの設計、ミドルウェアの選定
• マイクロサービスのパフォーマンスチューニング、モニタリング、アラート対応を通じたシステムの信頼性向上
• ユーザーの行動ログなどの定量的・定性的な分析による施策の効果測定とサービス改善
• 決済、与信、会計、本人確認（KYC）領域における複雑なドメイン課題（法的要件や厳格なデータ整合性を含む）に対する、高い正確性と拡張性を両立したシステム設計

Senior Software Engineer, Backend

• Build backend services, APIs and workflows for the AI Neobank app.
• Support products across insurance, payments, wallet, savings, investing, travel and financial services.
• Design reliable systems for user accounts, transactions, partner integrations, reconciliation, notifications and operations.
• Work with product and mobile teams to ship customer-facing journeys quickly.
• Integrate with banks, payment gateways, insurers, data providers and other partners.
• Improve system reliability, observability, security and performance.
• Build systems that are practical, auditable and ready for regulated financial products.

Backend Software Engineer – AI Neobank App

• Build backend services and APIs for onboarding, accounts, payments, cards, transfers, rewards, travel, FX, KYC and risk flows.
• Design reliable systems that can support real customer transactions, operational workflows and future financial products.
• Integrate with internal systems, financial partners, payment providers, AI services and third-party platforms.
• Own backend quality across reliability, security, latency, observability, data integrity and incident handling.
• Work with product, frontend, mobile and AI teams to launch features quickly and safely.
• Improve existing systems by simplifying flows, removing manual work and automating repeatable processes.

Backend Developer

• メルカリグループのあらゆる決済を支える汎用基盤の設計から運用まで担う
• 分散トランザクションの整合性・可用性・レイテンシのトレードオフを設計する
• 金融水準の信頼性を満たす設計が求められる
• 汎用基盤としての設計を行う
• 外部決済プロバイダとの接続を設計する
• 大規模トラフィックの安定処理を維持する

Software Engineer, Backend – Payment Core

• GoによるMicroservice開発、API開発
• Protocol Buffers + gRPC を用いたマイクロサービス間のI/F設計
• ユーザーの行動ログなどの定量的・定性的な分析による施策の効果測定とサービス改善
• アプリケーション要件に基づいたアーキテクチャの設計、ミドルウェアの選定
• マイクロサービスのパフォーマンスチューニング、モニタリング、アラート対応

Software Engineer, Backend - Payment Platform

• Build backend services, APIs and workflows for the finance super app.
• Design reliable systems for user accounts, transactions, partner integrations, reconciliation, notifications and operations.
• Work with product and mobile teams to ship customer-facing journeys quickly.
• Integrate with banks, payment gateways, insurers, data providers and other partners.
• Improve system reliability, observability, security and performance.
• Build systems that are practical, auditable and ready for regulated financial products.

Backend Software Engineer – Finance Super App

Software Engineer, Backend

• Participate in MuleSoft Technical Product and Consulting Services training, methodology and enablement.
• Begin participation in field activities with clients by shadowing seasoned architects and practicing enablement gained from training.
• Begin to execute MuleSoft implementations for customers and start on your journey to internalise business outcomes and business context relevance to MuleSoft implementation methodologies and approaches.
• Complete MuleSoft technical certifications and fully ramp on technology and implementation methodologies; start to develop and contribute subject matter expertise and project deliverables to internal knowledge exchange.
• Begin mentorship and guidance of junior Services team members and help to build out our services organisation.
• Continue to lead technical teams through multi-phased delivery projects and provide hands-on delivery guidance to influence standards for development, governance, and operational life cycle.
• Evangelise frameworks, project deliverables, best practices/policies and implementations to internal collaboration networks and IP sharing.
• Identify opportunities to expand MuleSoft footprint and drive further services and customer service, lead multiple engagements simultaneously, and drive partnerships and cross collaboration with MuleSoft partners, SIs and 3rd Parties.
• Identify ongoing risks and pain points throughout project experiences in the field and contribute to developing and implementing internal mitigation measures to meet customer needs.
• Evangelise, train, coach and mentor Services team members on hard technical skills and soft skills.
• Identify opportunities and efficiencies in customer IT operating model, and support implementation of the SDLC pipeline to get greater values out of the MuleSoft platform.
• Lead development of technical brown bag sessions and publish/facilitate reusable content to the field.
• Work with MuleSoft product leadership providing valuable product insight, guiding product direction and features.
• Deliver compelling presentations, architectural blueprint documents, and requirements-gathering workshops to influence the strategic direction of our projects and lead customers through solution design.

Technical Architect – MuleSoft

• Develop and operate backend applications in Java language (Java/Kotlin) for core banking systems
• Designing and developing for both performance and stability to maintain high reliability as a financial platform
• Understanding and implementing how to utilize infrastructure to solve system challenges
• Designing architecture based on application requirements and selecting middleware, etc.
• Performance tuning, monitoring settings, and alert response for microservices

Backend Engineer – Java, バックエンドエンジニア – Java

• Design, develop, maintain, and deploy high quality and reliable backend services for the Robot Platform
• Continuously improve test quality and coverage, as well as CI/CD pipelines and monitoring stack
• Collaborate with hardware, firmware, frontend, and business teams to improve overall system design and contribute to the evolution of robotic products and services
• Monitor deployed services, diagnose issues, and coordinate with the Woven City on-site operations team
• As necessary, travel to Woven City to perform on-site troubleshooting and maintenance

Backend Engineer jobs in Japan

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