Yuta Asakura
HomeProjectsBlogAboutContact

© 2026 Yuta Asakura | Portfolio. All rights reserved.

About Me

My skills, professional experience, education, and certifications.

DX Software Engineer

Sogo & Seibu

Hi 👋 I'm Yuta Asakura

I'm a Software Engineer based in Kawasaki, Japan. With a background spanning enterprise cloud architecture and full-stack web development, I love building things that actually reach users — whether that's migrating hundreds of databases at scale or crafting responsive frontends with React and Next.js. My tech journey took an unconventional path: 8 years in construction before pivoting into software engineering, which gave me a problem-solving mindset you don't pick up in a classroom.

Right now, I work as a DX Software Engineer at Sogo & Seibu, contributing to the in-house technology transformation of one of Japan's most historic retail brands.

🚀 I'm currently deepening my expertise in Next.js, TypeScript, and modern Full stack architecture while pursuing my CS degree at AMA University. I believe the best engineers never stop learning — and I'm always looking for the next challenge that pushes me further.

Skills

TypeScript
JavaScript
React
Next.js
Vue
TanStack Query
Zustand
Zod
Tailwind CSS
HTML
CSS
SASS
ShadCN/Radix UI

Experience

Sogo & Seibu Co., Ltd. (株式会社そごう・西武)

DX Software Engineer

Tokyo, Japan

May 2026 – Present

Department: Systems Department (DX Application Development) Contributing to enterprise digital transformation initiatives for one of Japan’s largest department store groups, supporting the transition from vendor-dependent systems toward in-house software development and modernization. Company Context: Sogo & Seibu operates iconic Japanese department store brands including Seibu (flagship in Ikebukuro) and Sogo, with roots dating back to 1830. Following acquisition by Fortress Investment Group in August 2023, the company is undergoing ambitious digital transformation—transitioning from vendor-dependent IT to building in-house development capabilities (自社開発).

  • Supporting modernization initiatives for internal enterprise systems and operational workflows across retail and e-commerce business units
  • Participating in cloud migration and cloud-ready architecture initiatives using Microsoft Azure and modern enterprise tooling
  • Assisting in the development and improvement of internal DX platforms, business applications, and workflow automation systems
  • Collaborating with internal stakeholders and external vendors to improve operational efficiency, documentation standards, and system maintainability
  • Supporting identity and access management (IAM), enterprise authentication, and role-based access control initiatives
  • Contributing to AI-assisted development workflows using GitHub Copilot and modern developer productivity tooling
  • Participating in enterprise reporting and analytics modernization efforts, including migration initiatives from legacy Microsoft Access and Excel-based workflows toward Power BI solutions
  • Working within an international engineering environment alongside teams across Japan and overseas locations
Technologies Used:
Microsoft AzurePower BIOracle DatabaseMicrosoft AccessGitHubGitCopilotVS CodeSalesforceTableauSnowflakeCommerableBacklogAWSPythonLinux
Sogo & Seibu Co., Ltd. (株式会社そごう・西武) logo

HCLTech (株式会社エイチシーエルジャパン)

Software Engineer (Database Migration Team Lead)

Tokyo, Japan · Hybrid

Apr 2025 – Apr 2026

Leading the database migration workstream for Nissan's enterprise cloud transformation, migrating 234 databases (647TB) across 151 applications from on-premises to AWS Tokyo Region.

  • Promoted mid-project from individual contributor to Database Migration Team Lead, managing a 5-member team of database SMEs across SQL Server, MySQL, PostgreSQL, and Oracle platforms
  • Served as primary point of contact for all database-related customer interactions across multi-vendor partnerships (Nissan, AWS, Fujitsu, HCL)
  • Architected 3 migration strategies (Native Backup/Restore, AWS DMS with CDC, Schema-level via SSMS), achieving 99.9% data integrity across all migrations
  • Designed multi-stage upgrade pipeline for SQL Server 2008–2019 → RDS 2022, including rollback strategies
  • Created 200+ page enterprise runbook templates adopted as the standard for all subsequent migration phases
  • Implemented cost optimization frameworks reducing test environment expenses by 60% through right-sizing
  • Delivered pilot migrations for 20 applications, establishing the scalable framework for production rollout
  • Led cross-regional coordination between teams in Japan, India, Singapore, Australia, and the Americas
Technologies Used:
AWSRDSEC2DMSS3VPCIAMCloudWatchMGNMSSQL (2008-2022)Oracle DBPostgreSQLMYSQLSSMSPowerShellAWS CLINative Tools (Backup and Restore)DatapumpCDC ReplicationJiraConfluenceMS TeamsOutlookSharepoint
HCLTech (株式会社エイチシーエルジャパン) logo

TierLine Inc. (株式会社ティアライン)

Full-Stack Web Developer

Tokyo, Japan · Remote

Oct 2024 – Mar 2025

Built features for a live sports streaming CMS (VK Sports Bull Koshien) powering live broadcasts, match scheduling, and video replay for Japanese high school baseball tournaments nationwide.

  • Modernized the existing development environment: Dockerized the application, upgraded Java and Node.js versions, updated Yarn and project dependencies to improve build stability
  • Implemented a complex new delivery type (Self-Delivery Test) end-to-end: schedule registration modals with business rule validation, relay stadium screen UI updates, and CSV bulk import/export
  • Built AWS MediaLive integration including a scheduled batch service to automatically start/stop transcoder channels, real-time channel status polling, and channel ID extraction from database URLs
  • Developed Slack webhook notification system for real-time operational alerts and an automated reminder email batch processor with scheduled jobs
  • Collaborated in daily Agile standups with client (Asahi Shimbun/IIJ), managed Gitflow branching with code reviews, and deployed to AWS EC2 with Docker
Technologies Used:
ReactTypescriptJavaSpringbootMYSQLMyBatisAWSEC2GradleAWS MediaLiveYarnGitGithubBacklogBootstrapSlackSlack API
TierLine Inc. (株式会社ティアライン) logo

Watanabe Construction Industry Co. (株式会社渡部建設工業)

Construction Worker / Foreman

Yokohama, Kanagawa, Japan

Apr 2016 – Jun 2024

8 years in construction developing leadership, team coordination, and project management skills that now inform my approach to software engineering.

  • Supervised construction teams to complete scaffolding and building projects on time, ensuring safety and quality compliance
  • Coordinated with project managers, engineers, and contractors to optimize workflows and maintain project schedules
  • Trained and mentored team members on scaffolding techniques, safety protocols, and equipment use, fostering collaboration and skill development
Watanabe Construction Industry Co. (株式会社渡部建設工業) logo

Education

AMA University

Bachelor of Science in Computer Science

2024 – 2027

Currently pursuing while working full-time. Deepening knowledge in data structures, algorithms, database systems, software engineering, and web development.

AMA University logo

Le Wagon Tokyo

Full-Stack Web Development Bootcamp

Computer Software Engineering

2024 – 2024

Intensive 400-hour full-time coding bootcamp focused on modern web development and AI integration. Collaborated on a full-stack project from ideation to production using Ruby, Ruby on Rails, JavaScript, PostgreSQL, Docker, Heroku, and OpenAI APIs. Designed, implemented, and deployed an AI-powered CRM-like tool (PRM) for managing personal relationships.

Le Wagon Tokyo logo

Southville International School and Colleges

Bachelor of Science in Information Technology

2012 – 2016

Southville International School and Colleges logo

Certifications

Claude Certified Architect - Foundations badge

Claude Certified Architect - Foundations

Anthropic

ID: fwfqcv9j4k3p

Earned Apr 2026

View Credential

Microsoft Certified: Azure Fundamentals (AZ-900)

Microsoft

ID: A3BBEE453A38FB5F

Earned May 2026

View Credential

GitHub Copilot (GH-300)

Microsoft

ID: 1F1847930B647F5A

Earned May 2026 · Expires May 2028

View Credential

GitHub Foundations (GH-900)

Microsoft

ID: B7EF42DA04EB39A4

Earned May 2026 · Expires May 2028

View Credential
AWS Certified Solutions Architect – Associate (SAA-C03) badge

AWS Certified Solutions Architect – Associate (SAA-C03)

Amazon Web Services (AWS)

ID: c1dbffe1aeef43ec8e636f4cc4066c8b

Earned Jun 2025 · Expires Jun 2028

View Credential
AWS Certified Developer – Associate (DVA-C02) badge

AWS Certified Developer – Associate (DVA-C02)

Amazon Web Services (AWS)

ID: 47fe0cdbc1484d4e93390832f5d805e9

Earned Jul 2025 · Expires Jul 2028

View Credential
AWS Certified SysOps Administrator – Associate (SOA-C02) badge

AWS Certified SysOps Administrator – Associate (SOA-C02)

Amazon Web Services (AWS)

ID: fa496853810a4cf8be9838db7864e979

Earned Aug 2025 · Expires Aug 2028

View Credential
AWS Certified Data Engineer – Associate (DEA-C01) badge

AWS Certified Data Engineer – Associate (DEA-C01)

Amazon Web Services (AWS)

ID: cb4c64fcd11247cea8726e5c7f786ed3

Earned Jul 2025 · Expires Jul 2028

View Credential
AWS Certified Machine Learning Engineer – Associate (MLA-C01) badge

AWS Certified Machine Learning Engineer – Associate (MLA-C01)

Amazon Web Services (AWS)

ID: 1c60fbea5b3c4e0eba90ce03ed792e34

Earned Sep 2025 · Expires Sep 2028

View Credential
AWS Certified AI Practitioner (AIF-C01) badge

AWS Certified AI Practitioner (AIF-C01)

Amazon Web Services (AWS)

ID: e6415368b5384486814f0d80a8614cc0

Earned May 2025 · Expires May 2028

View Credential
AWS Certified Cloud Practitioner (CLF-C02) badge

AWS Certified Cloud Practitioner (CLF-C02)

Amazon Web Services (AWS)

ID: 8b1ae03ac67d41c7bcfde3c056212ab5

Earned May 2025 · Expires May 2028

View Credential
Full-Stack Web Development Bootcamp badge

Full-Stack Web Development Bootcamp

Le Wagon Tokyo

Earned Aug 2024

TOEIC Listening & Reading: 980 badge

TOEIC Listening & Reading: 980

一般財団法人 国際ビジネスコミュニケーション協会(IIBC)

ID: 1470195-9

Earned Nov 2025

View Credential