Full-stack Engineer

• You will design and implement highly available, cost-efficient, and secure multi-cloud Kubernetes solutions and cloud services
• Develop full-stack software and Kubernetes controllers, written in Go, Python and Typescript
• Write automated tests and health checks to validate critical components
• Design modular infrastructure deployment patterns for Kubernetes configurations with common tools like Kustomize, Helm, and Terraform
• Collaborate with engineers across disciplines to define engineering requirements and deliver customer value
• Partner with and advise Site Reliability and Observability engineers to triage, troubleshoot, and mitigate production issues
• Advise manager, peers, and senior leaders across domains on Kubernetes and platform engineering best practices and architecture patterns
• Mentor junior engineers in both functional and related teams

Senior Kubernetes Software Engineer, Multicloud Runtime

• Design, implement, and maintain high-quality iOS features using Swift and modern iOS frameworks.
• Own end-to-end feature development, from requirements definition through architecture, implementation, testing, and release.
• Lead architectural design for complex features and system components, ensuring maintainability, scalability, and reliability.
• Optimize app performance, startup time, memory usage, and stability across diverse devices and OS versions.
• Work closely with machine learning, backend, infrastructure, product, and design teams to deliver seamless mobile experiences, as well as other feature-owner iOS engineering teams.
• Contribute to and evolve Mercari's mobile platform, SDKs, and shared modules used across teams.
• Drive high code quality through code reviews, automated testing, CI/CD improvements, and rigorous documentation.
• Champion engineering best practices and contribute to guidelines and standards across Client Engineering.
• Stay current with the latest developments in iOS, Swift, UIKit, SwiftUI, concurrency, and mobile architecture patterns.
• Bring innovative ideas to improve user experience, developer experience, and operational efficiency.
• Take ownership of initiatives that span multiple teams, driving alignment and technical decision-making.
• Mentor junior and mid-level engineers, helping strengthen the overall technical capabilities of the team.

Senior Software Engineer, iOS – Mobile Enablement

• 国内におけるフリマアプリ「メルカリ」、スマホ決済サービス「メルペイ」の機能開発に挑戦していただきます。
• 多様なバックグラウンドや専門性を持つソフトウェアエンジニアが所属するチームにジョインしていただき、チームの一員として業務を担っていただきます。
• 具体的な業務内容については、メルカリ・メルペイにおけるお客さま目線のUX向上や仕様改善に関するプロジェクトに携わっていただきます。
• 現在、メルカリでは検索画面の改善をはじめ、出品・購買に関する多様な施策が行われており、実際に技術やデータに触れていただき、アウトプットを出していただきます。
• 最終的には、成果報告会で業務内容と実際の成果について報告していただきます。

Software Engineer, Internship

• Own the satellite system across the full lifecycle, from mission requirements definition through design, development, testing, launch preparation, and operations readiness.
• Lead system‑level architecture decisions covering satellite bus, payload, ground segment, and operational concepts.
• Drive technical trade‑off analyses across performance, mass, power, cost, schedule, and risk.
• Serve as the primary technical decision‑maker (or delegate technical authority) for project‑level engineering topics.
• Identify, assess, and mitigate technical risks at both system and subsystem levels.
• Lead project execution with a strong engineering focus, ensuring technical feasibility, quality, and consistency.
• Develop and manage integrated schedules aligned with engineering milestones and reviews.
• Support project cost control and P&L decision‑making by assessing technical cost drivers and design choices.
• Plan, prepare, and technically lead major project reviews, including SRR, PDR, CDR, TRR, and FRR.
• Technically lead internal and external engineering teams across satellite, payload, ground, and operations domains.
• Conduct technical reviews and provide guidance to subsystem leads and engineers.
• Coordinate and negotiate technical matters.
• 技術リーダーシップ／システム責任**ミッション要求定義から設計、開発、試験、打上げ準備、運用準備完了まで、プロジェクトライフサイクル全体にわたって人工衛星システムの責任を担う**衛星バス、ペイロード、地上系、運用コンセプトを含む、システムレベルのアーキテクチャ決定をリード**性能、質量、電力、コスト、スケジュール、リスクを考慮した技術トレードオフの検討および意思決定を主導**プロジェクトレベルの技術課題に対する主要な技術意思決定者（または権限委譲者）として、システムおよびサブシステム両レベルでの技術リスクの特定、評価、低減策の策定および実行
• 技術視点でのプロジェクト推進
• 技術的実現性、品質、一貫性を重視した プロジェクト実行のリード**エンジニアリングマイルストーンおよび技術レビューに連動した統合プロジェクトスケジュールの策定・管理**設計判断や技術選択がコストに与える影響を評価し、プロジェクトのコスト管理およびP&L判断を技術面から支援**SRR、PDR、CDR、TRR、FRR などの主要プロジェクトレビューの計画、準備、技術的な主導

Satellite Technical Lead

• Design and operate full-stack solutions and APIs optimized for high-scale B2B commerce partnerships across APAC.
• Collaborate closely with product and engineering teams to localize portal features, ensuring seamless integration with regional payment and distribution standards.
• Leverage LLMs and AI tooling to generate production-grade code that accelerates the delivery of partner-specific requirements.
• Develop and maintain gRPC and REST-based microservices that power real-time travel inventory and fintech ancillaries.
• Work autonomously to resolve complex technical challenges while maintaining strong asynchronous alignment with global stakeholders.
• Iterate quickly on engineering improvements that enhance the scalability and performance of our B2B travel ecosystems.

Fullstack Software Engineer – Commerce/Partner Success

• Lead a small team of 5+ engineers and bridge technical expertise with Japanese communication.
• Communicate effectively in Japanese on technical topics, including writing strong technical documents and inquiry responses.
• Drive maintenance development, including issue investigation and OSS version upgrades, to deepen product knowledge.
• Respond to client inquiries, clarifying specifications and business processes.

See all jobs on JobTailor

Senior Kubernetes Software Engineer, Multicloud Runtime

Senior Software Engineer, iOS – Mobile Enablement

Software Engineer, Internship

Satellite Technical Lead

Fullstack Software Engineer – Commerce/Partner Success

Japanese Speaking Technical Lead