IT Mainframe Application Engineer

Posted 2 Days Ago
Be an Early Applicant
Tokyo, JPN
Hybrid
Mid level
Fintech • Information Technology • Insurance • Financial Services • Big Data Analytics
At MetLife, we’re a purpose-driven company that helps our customers build a more confident future.
The Role
Designs, develops, tests, and maintains insurance mainframe applications using COBOL and related technologies. Translates business requirements into technical designs, improves batch and online performance, analyzes incidents, and manages releases. The role also drives AI-First engineering, modernization, GitHub, CI/CD, test automation, process standardization, and reviews of AI-generated artifacts. Collaboration with development teams, vendors, stakeholders, and offshore teams is required, along with support for waterfall-to-Agile transformation and security compliance.
Summary Generated by Built In
Description and Requirements
Job Summary:
当社の保険業務を支えるメインフレームシステムの設計・開発・保守を担当するとともに、AI-Firstな開発・保守モデルへの変革を推進します。生成AI、自動化、CI/CDなどの技術を活用して生産性と品質を向上させ、次世代のメインフレームエンジニアリングを実現する役割を担います。
Responsibilities:
  • メインフレームアプリケーションの設計、開発、テスト、保守を担当
  • 業務要件を理解し、システム仕様に落とし込むための分析・設計を実施
  • GitHub、CI/CD、テスト自動化などのモダナイゼーション施策の導入・推進
  • AIを活用して要件分析、設計、コーディング、テスト、障害分析、ドキュメント作成の生産性向上を実現
  • AIが生成したコード、テストケース、設計書および運用成果物をレビューし、品質、保守性、セキュリティおよび業務要件への適合性を担保
  • AI-Firstな開発・保守プロセスの確立、標準化および継続的改善を推進
  • 開発チームおよびベンダーと連携し、AIを活用したソフトウェアエンジニアリングのベストプラクティスを展開
  • バッチ処理やオンライン処理のパフォーマンス改善、障害対応、根本原因分析を実施
  • アプリケーションの変更管理、リリース計画、運用手順書の作成および継続的な改善を推進
  • ウォーターフォール開発プロセスにおけるプロジェクト計画、WBS作成、レビューを実施し、将来的なアジャイル開発への移行を支援
  • セキュリティ、コンプライアンスおよびリスク管理要件を満たすシステム設計・運用を実施

Experience:
  • メインフレーム環境(COBOL、JCL、DB2、CICSなど)におけるシステム開発・保守経験3年以上
  • 業務要件の分析、設計、開発、テスト、本番リリースまでのシステム開発ライフサイクルに関する実務経験
  • 障害分析、原因調査、パフォーマンス改善などのアプリケーション保守経験
  • 開発プロセス改善、自動化、またはモダナイゼーション施策の推進経験があれば尚可
  • Git、CI/CD、テスト自動化などのモダンなソフトウェアエンジニアリング手法の利用経験があれば尚可
  • 生成AIやAI開発支援ツールを活用したソフトウェア開発・保守経験があれば尚可
  • AIを活用したソフトウェアエンジニアリングの実践を通じて、生産性、品質、保守性の向上を推進した経験があれば尚可

Skills:
  • 高い問題解決力、分析力、および論理的思考力
  • メインフレーム技術(COBOL、JCL、VSAM、DB2、CICS)に関する知識・経験
  • AIを活用したソフトウェア開発・保守に関する知識および実践力
  • AIが生成したコード、設計書、テストケースなどの成果物を評価・レビューし、品質を担保する能力
  • バッチ処理およびオンライン処理の設計、性能改善、障害解析スキル
  • 要件定義、設計、開発、テスト、リリースまでのソフトウェア開発ライフサイクルに関する知識
  • GitHub、CI/CD、テスト自動化などのモダンなソフトウェアエンジニアリング手法に関する知識または経験
  • DevOpsおよび継続的改善のマインドセット
  • チームメンバー、ベンダーおよび関係者と効果的に連携できるコミュニケーション能力
  • 新しい技術やAI活用手法を継続的に学習し、業務へ適用する能力
  • AI-Firstな開発・保守モデルの構築、標準化、および定着を推進できる能力
  • Assemblerの知識・経験があれば尚可
  • アジャイル開発の理解および実践経験があれば尚可

Preferable:
  • 保険業界または金融業界でのシステム開発・保守経験
  • AI開発支援ツールを活用したソフトウェア開発経験
  • GitHub、CI/CD、テスト自動化などの導入・活用経験
  • メインフレームモダナイゼーションプロジェクトへの参画経験
  • オフショアチームまたはベンダーのリード経験
  • AI-Firstな開発・保守プロセスの構築または改善経験

Language:
以下のいずれかを満たすこと
  • 日本語でビジネス部門との要件調整およびプロジェクト推進をリードできること
  • 英語でオフショア開発チームとの開発・保守業務をリードできること
  • 日本語または英語による業務コミュニケーション能力
  • グローバル環境における協働経験があれば尚可

Personality:
  • 変化を前向きに受け入れ、新しい技術や働き方の導入を推進できる方
  • AI-Firstな開発・保守モデルの実現に情熱を持ち、継続的な改善に取り組める方
  • 高いオーナーシップを持ち、課題を主体的に発見・解決できる方
  • 品質、生産性、および顧客価値の向上に強い責任感を持って取り組める方
  • AIが生成した成果物を鵜呑みにせず、適切に評価・レビューできる批判的思考力を持つ方
  • チームメンバー、ビジネス部門、ベンダー、オフショアチームと協力しながら成果を創出できる方
  • 自ら学び続け、新しい知識やスキルを業務へ積極的に適用できる方
  • 複雑な課題に対して粘り強く取り組み、最後までやり遂げる姿勢を持つ方
  • 多様な意見を尊重し、周囲を巻き込みながら変革を推進できる方

Job Summary:
Responsible for the design, development, and maintenance of mainframe systems that support our insurance business, while driving the transformation toward an AI-First development and maintenance model.
This role leverages Generative AI, automation, CI/CD, and other modern engineering practices to improve productivity and quality, helping to build the next generation of mainframe engineering capabilities.
Responsibilities:
  • Design, develop, test, and maintain mainframe applications.
  • Analyze business requirements and translate them into system designs and technical specifications.
  • Drive and promote modernization initiatives, including GitHub, CI/CD, and test automation.
  • Leverage AI to improve productivity across requirements analysis, design, coding, testing, incident analysis, and documentation.
  • Review AI-generated code, test cases, design documents, and operational deliverables to ensure quality, maintainability, security, and alignment with business requirements.
  • Establish, standardize, and continuously improve AI-First development and maintenance processes.
  • Collaborate with development teams and vendors to promote best practices for AI-powered software engineering.
  • Improve performance of batch and online processing, troubleshoot incidents, and perform root cause analysis.
  • Manage application changes, release planning, operational procedures, and continuous process improvement.
  • Create project plans, work breakdown structures (WBS), and conduct reviews within a waterfall development environment, while supporting the transition to Agile development practices.
  • Design and operate systems in compliance with security, compliance, and risk management requirements.

Experience:
  • 3+ years of experience in system development and maintenance within a mainframe environment (e.g., COBOL, JCL, DB2, CICS)
  • Hands-on experience across the full software development lifecycle, including requirements analysis, design, development, testing, and production release
  • Experience in application maintenance, including incident analysis, root cause investigation, and performance optimization
  • Experience driving development process improvements, automation initiatives, or modernization programs is preferred
  • Experience with modern software engineering practices such as Git, CI/CD, and test automation is preferred
  • Experience leveraging Generative AI or AI-assisted development tools for software development and maintenance is preferred
  • Experience improving productivity, quality, and maintainability through AI-enabled software engineering practices is preferred

Skills:
  • Strong problem-solving, analytical, and logical thinking skills
  • Knowledge and experience with mainframe technologies, including COBOL, JCL, VSAM, DB2, and CICS
  • Knowledge and practical experience in AI-assisted software development and maintenance
  • Ability to evaluate and review AI-generated artifacts, including code, design documents, and test cases, to ensure quality and accuracy
  • Skills in batch and online processing design, performance optimization, and incident analysis
  • Knowledge of the software development lifecycle, including requirements definition, design, development, testing, and release management
  • Knowledge of or experience with modern software engineering practices such as GitHub, CI/CD, and test automation
  • DevOps mindset and commitment to continuous improvement
  • Strong communication and collaboration skills to work effectively with team members, vendors, and stakeholders
  • Ability to continuously learn and apply new technologies and AI-driven engineering practices
  • Ability to establish, standardize, and drive adoption of AI-First development and maintenance models
  • Knowledge of or experience with Assembler is preferred
  • Understanding of and practical experience with Agile development methodologies is preferred

Preferable:
  • Experience in system development and maintenance within the insurance or financial services industry
  • Experience using AI-assisted development tools for software engineering
  • Experience implementing and utilizing GitHub, CI/CD, and test automation practices
  • Experience participating in mainframe modernization initiatives
  • Experience leading offshore development teams or external vendors
  • Experience establishing or improving AI-First development and maintenance processes

Language:
Candidates must satisfy one of the following:
  • Ability to lead requirements discussions and project execution with business stakeholders in Japanese, or
  • Ability to lead development and maintenance activities with offshore development teams in English
  • In addition: Professional communication skills in either Japanese or English
  • Experience working in a global and multicultural environment is preferred

Personality:
  • Embraces change positively and actively promotes the adoption of new technologies and ways of working
  • Passionate about realizing an AI-First development and maintenance model and committed to continuous improvement
  • Demonstrates strong ownership and takes a proactive approach to identifying and resolving challenges
  • Committed to improving quality, productivity, and customer value
  • Possesses strong critical thinking skills and is able to appropriately assess and review AI-generated outputs rather than accepting them at face value
  • Able to collaborate effectively with team members, business stakeholders, vendors, and offshore teams to deliver results
  • Continuously learns and proactively applies new knowledge and skills in daily work
  • Demonstrates perseverance in solving complex problems and a strong commitment to delivering outcomes
  • Respects diverse perspectives and can influence and engage others to drive organizational change and transformation

福利厚生
メットライフ生命では、ワークライフバランスと社員の心身の健康を促進する福利厚生を提供しています。社員はフレックスタイム制度、年次有給休暇、特別連続休暇、リフレッシュ休暇等の休暇を利用できます。また、社会保険や団体保険の他、旅行や英会話教室で使える割引も提供しています。柔軟に働けるよう、オフィス勤務と在宅勤務を組み合わせた勤務形態の導入や、短時間勤務制度、また柔軟性のあるドレスコードなども設けています。
Benefits We Offer
MetLife Japan offers a comprehensive benefits package that promotes work-life balance and employee wellbeing. Employees can take advantage of flex time policy and a generous time-off policy, national holidays, annual paid leave, special consecutive leave, and refreshment leave. We also provide full social insurance coverage, a commuting expense reimbursement, group insurance, and discounts on travel and English language lessons. To support work flexibility, employees also have hybrid work options, shortened working hours for parents with children in third grade or below, and a casual dress code.
メットライフについて
メットライフは、グローバルで展開する金融サービス企業です。個人および法人のお客さまがより確かな未来を築けるよう、保険、年金、社員福利厚生給付、資産管理のサポートを提供しています。1868年に創業したメットライフは、世界40以上の市場で事業を展開し、米国、アジア、中南米、ヨーロッパ、中東において業界をリードしています。
メットライフは、New Frontier戦略の一環として、AIを活用し、人を中心に据えた未来を築いています。私たちは、AIを活用して顧客へのサービス向上、地域社会への支援、そして働き方の変革を推進していく中で、好奇心、適応力、そして成長意欲を持つ人材を求めています。メットライフにおいて、AIは、人間の判断力、創造性、継続的な改善を支える責任あるパートナーであり、信頼、インクルージョン、そして長期的な価値の構築に貢献しています。
メットライフ生命は、日本初の外資系生命保険会社として、1973年2月に国内での営業を開始しました。当社のPurpose「ともに歩んでゆく。よりたしかな未来に向けて。」は、メットライフが誇るグローバルネットワークと世界中のベストプラクティスを活かし、お客さまのニーズに応え、地域社会との信頼関係を築くという信念を表しています。
About MetLife
MetLife Inc., through its subsidiaries and affiliates (MetLife), is one of the world's leading financial services companies, providing insurance, annuities, employee benefits and asset management to help individual and institutional customers build a more confident future. Founded in 1868, MetLife has operations in more than 40 markets globally and holds leading positions in the United States, Asia, Latin America, Europe and the Middle East.
As part of our New Frontier strategy, MetLife is building an AI-enabled, people-centered future. We're looking for people who bring curiosity, adaptability, and a growth mindset as we use AI to enhance how we serve customers, support communities, and evolve the way work gets done. At MetLife, AI is a responsible partner that supports human judgment, creativity, and continuous improvement while helping us build trust, inclusion, and long-term value.
MetLife Japan began operations in February 1973 as Japan's first foreign-owned life insurance company. Our purpose, "Always with you, building a more confident future," encapsulates our strong commitment to leveraging our global network and best practices worldwide to stand with our customers and build trust with our communities.
#BI-Hybrid

Skills Required

  • At least 3 years of system development and maintenance experience in a mainframe environment, including technologies such as COBOL, JCL, DB2, or CICS.
  • Hands-on experience across the software development lifecycle, including requirements analysis, design, development, testing, and production release.
  • Application maintenance experience involving incident analysis, root-cause investigation, and performance optimization.
  • Strong problem-solving, analytical, and logical thinking skills.
  • Knowledge and experience with mainframe technologies including COBOL, JCL, VSAM, DB2, and CICS.
  • Knowledge and practical experience in AI-assisted software development and maintenance.
  • Ability to evaluate and review AI-generated code, design documents, and test cases for quality and accuracy.
  • Skills in batch and online processing design, performance optimization, and incident analysis.
  • Knowledge of software development lifecycle practices through requirements definition, design, development, testing, and release management.
  • Knowledge of or experience with GitHub, CI/CD, and test automation.
  • DevOps mindset and commitment to continuous improvement.
  • Strong communication and collaboration skills with team members, vendors, and stakeholders.
  • Ability to establish, standardize, and drive adoption of AI-First development and maintenance models.
  • Ability to lead requirements discussions and project execution with business stakeholders in Japanese, or lead development and maintenance activities with offshore teams in English.
  • Professional communication skills in either Japanese or English.
  • Experience driving development process improvements, automation initiatives, or modernization programs.
  • Experience leveraging Generative AI or AI-assisted development tools for software development and maintenance.
  • Experience improving productivity, quality, and maintainability through AI-enabled software engineering practices.
  • Knowledge of or experience with Assembler.
  • Understanding of and practical experience with Agile development methodologies.
  • Experience in insurance or financial services system development and maintenance.
  • Experience implementing and utilizing GitHub, CI/CD, and test automation practices.
  • Experience participating in mainframe modernization initiatives.
  • Experience leading offshore development teams or external vendors.
  • Experience establishing or improving AI-First development and maintenance processes.
  • Experience working in a global and multicultural environment.

What the Team is Saying

Chelsea
Nick
Naren
Laura
Bill
Jing Huang
Sara Strauch
Dan Xiao
Cara Mootz
Cara Mootz
Naren Peri
Patricia Hixson
Jing Huang
Samantha Heron
Pete Clarke
Erica Provido
Rene Rivera

MetLife Compensation & Benefits Highlights

  • Retirement Support — Retirement offerings include both a company 401(k) match and a pension/cash-balance component for eligible employees, which is highlighted as a notable strength. This combination is described as providing stronger long-term security than a 401(k) alone.
  • Healthcare Strength — Health coverage is described as broad with family options and relatively low premiums, and medical, dental, and vision plans are often cited as standouts. Additional wellbeing resources such as counseling, condition-specific programs, and related support further reinforce this area.
  • Leave & Time Off Breadth — Paid time off is often characterized as generous, with many noting good work-life balance in several departments. Parental and family support resources also appear in the package, adding flexibility for caregiving needs.

MetLife Insights

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The Company
HQ: New York, NY
43,000 Employees
Year Founded: 1868

What We Do

We're honored to be No. 10 on Great Place to Work's World's Best Workplaces and recognized in the Fortune 100 Best Companies to Work For® list in 2025. At MetLife, we're leading the global transformation of an industry we’ve defined for over 157 years. At MetLife, every innovation and line of code is a lifeline for our customers and their families—from victims of natural disasters to people living with disabilities and beyond. With operations in more than 40 markets and leading positions across the globe, MetLife fosters an inclusive culture where our people are energized and inspired to deliver for our customers and communities. Join our remarkable journey—one in which you help write the next century of innovation in financial services—because with MetLife, making the world a better place is All Together Possible.

Why Work With Us

At MetLife, you’ll be working for a company whose purpose is to help customers throughout their life’s journey, and often in their most critical time of need. You’ll be a part of developing leading-edge platforms that will have a lasting impact on the lives and well-being of tens of millions of customers.

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About our Teams

MetLife Offices

Hybrid Workspace

Employees engage in a combination of remote and on-site work.

MetLife's current workplace policies classify roles as Office, Hybrid or Virtual based on the nature of work, encouraging new ways of working together

Typical time on-site: Flexible
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