Resume

Basic Information

• Name: Yuta Hidaka
• Role: Full Stack Developer / Tech Lead
• Location: Shibuya, Tokyo
• Date of Birth: 1994-03-22
• GitHub: https://github.com/yuta-hidaka
• LinkedIn: https://www.linkedin.com/in/%E6%82%A0%E5%A4%AA-%E6%97%A5%E9%AB%98-2823a8195/

Updated: 2026-07-25

Summary

Backend/Full-stack engineer specializing in Go and TypeScript. Experienced in designing and operating high-traffic systems (thousands of RPS), building cloud infrastructure on AWS/GCP, and implementing event-driven architectures with Kafka and Spark. As a tech lead, managed a 16-member overseas team, launched a new cross-functional team, and reduced infrastructure costs by 30% through serverless optimization — contributing on both technical and business fronts. Transitioned to software engineering in 2018 after six years of R&D at a chemical manufacturer; currently working as a backend engineer at SUPER STUDIO.

Experience

SUPER STUDIO / Backend Engineer (2025-07 – Present)

Big Data Group (Backend Team → xfunction Team)

• Built and maintained systems with Golang, Next.js, Kafka, Spark, Trino, Iceberg, Parquet, ArgoCD, Kubernetes, and k9s
• Big data infrastructure, event-driven architecture, Kubernetes operations, Scrum development
• Played a central role as a founding member of the xfunction team
• Previously, FE/BE communication and cross-department coordination was fragmented — a project scheduled for June release was delayed until October due to communication losses
• Prioritized psychological safety in the new team: conducted Drucker-style exercises, fostered proactive inter-member communication, and aligned expectations with PdM and stakeholders, eliminating unintended project delays to zero within 5 months of the team's establishment
• Data platform on Iceberg (Parquet storage) with Trino as the analytics query engine; introduced Spark SQL's CREATE OR REPLACE TABLE in the data ingestion process, improving processing speed and cost by 30%
• Drove AI adoption by optimizing Claude Code's Agents (subagents) and harness — designed and rolled out a subagent setup that routes tasks to Opus, Sonnet, or Haiku by workload, cutting token usage cost by 50%
• Proactive communication with designers, cross-department/cross-team collaboration, lead role within xfunction team

Tech Stack: Go, Next.js, Kafka, Spark, Trino, Iceberg, Parquet, Kubernetes, ArgoCD, k9s

Monstarlab / Tech Lead, Full-Stack Engineer (2022-09 – 2025-06)

Okinawa Theme Park Web App Development (2025-01 – 2025-06) - Tech Lead / 5 members (50+ including PM/PMO)

• Web app, native app, backend, and admin panel development for a theme park opening in 2025
• Led team through English communication with Vietnamese team, including onsite collaboration in Vietnam (business trip and stay); owned app/backend/infrastructure
• Joined with 1.5 weeks until web page release deadline; aligned with stakeholders in first 2 days and built IaC-based serverless infrastructure using SST and Pulumi
• Configured system to handle peak traffic exceeding 10,000 RPS, contributing to stable operations
• Built backend in microservices architecture handling 3,000 RPS at origin
• Constructed data analytics platform with Parquet format using Athena, Lambda, Glue, and Quick Suite (AWS), leveraging IaC and AI
• Rapidly delivered native app development, backend construction, and admin panel implementation
• Reduced infrastructure costs by 30% via serverless optimization; proposed AI integration (Devin) and IaC adoption
• Conducted mob programming sessions despite tight deadlines to actively share specifications and experience with team members

Furusato Tax Points → Stock Exchange Service (2024-11 – 2025-01) - Software Engineer / 100 members

• Assigned as software engineer to web app development for a service converting furusato tax points to stocks
• Microservices architecture with overall traffic exceeding 20,000 RPS; responsible area handled up to 1,500 RPS
• Implemented with Next.js 15 App Directory and GCP Cloud Run
• Frontend performance tuning including WebP/AVIF image optimization and lazy loading
• Caught up quickly in Agile development with PBI creation and release operations

Corporate Website CMS Migration (2024-04 – 2024-11) - Tech Lead / 3 members

• Participated as tech lead in corporate portal site CMS migration project
• Joined from proposal stage, selected architecture and services considering client pain points and company situation
• Reverse-engineered customized CMS and migrated to headless CMS entirely code-based
• Eliminated operational dependencies by implementing infrastructure as IaC
• Designed ISR-like architecture with Lambda + Astro JS, reducing CMS costs from ~200,000 JPY/month to 10,000-20,000 JPY/month
• Improved SEO performance while meeting client KPIs

Corporate Website Update (2022-09 – 2023-10) - Software Engineer / 6 members

• Rebuilt company inventory management web app, including DB design, direction, and collaboration with overseas team
• Handled infrastructure, backend, and frontend as full-stack engineer

Tech Stack: TypeScript, Next.js 15, React, Astro, Go, Vue (NUXT3), AWS, GCP, SST, Pulumi, Terraform, Cloud Run, Spanner, MySQL, Data Dog

KiteRa / Full-Stack Engineer (2021-05 – 2022-07)

SaaS Development for Labor and Social Security Attorneys - Software Engineer / 5 members

• Developed new features for regulation management SaaS using Golang, Svelte, PostgreSQL, and AWS
• Led development of Japan's first electronic application feature for the 36 Agreement via e-Gov integration
• Joined during seed/early stage, developed necessary features as company grew from ~10 to 60-70 employees

Tech Stack: Go, Svelte, PostgreSQL, AWS, Python, Stripe

Fignny / Software Engineer (2020-08 – 2021-04)

CRM Development (2020-09 – 2021-04) - Coder / 25 members

• New feature development and bug fixes for CRM service used by 1,600+ companies
• Deployed Python APIs on Lambda, providing all features via API
• DynamoDB query improvements, bug fixes, new feature development
• Improved onboarding documentation, reducing workload for senior engineers
• Resolved performance issues caused by DynamoDB data growth (150GB) through query optimization and index creation

Web Scraping Project (2020-08 – 2020-09) - Coder / 2 members

• Scraped all article data from a 2 billion PV/month summary site before service termination
• Reverse-engineered HTML structure, created scraping program with BeautifulSoup4
• High-speed processing with ThredPoolExecutor and Celery distributed/queue processing on AWS EC2/S3/Aurora
• Completed coding in 2 weeks and scraped nearly 1.5 million articles in 2 weeks (DB 60GB+, images 2TB+)
• Finished 2-month planned work in 2 weeks

Tech Stack: Python, Django, DynamoDB, AWS Lambda, Aurora, Celery

Freelancer (2020-07 – 2020-07)

Time Management Software for Legal Professionals - Coder / 4 members

• Feature additions to time and billing management system (Laravel)
• Implemented CSV export for aggregated data, new features, and bug fixes

SysNavi / Software Engineer (2018-10 – 2020-06)

Time Management Software for Legal Professionals (2019-06 – 2020-06) - Coder / 4 members

• Developed time management system for 30-person law firm
• Participated from specification and DB design stage; introduced ticket-driven development by integrating Redmine and Backlog with GitLab
• PDF output function, Bootstrap mockup creation, docker-compose staging environment setup, requirements definition, client communication
• Laid groundwork for transforming SES-focused company into contract development company

Audit Firm DB Integration Project (2019-02 – 2019-06) - Coder / 5 members

• Managed various format data from Big 4 accounting firm in unified DB
• Data migration and analysis using Alteryx and SQL Server, data cleansing logic creation
• KPI and budget vs actual calculation, data visualization with Tableau

Other Projects

• Chemical manufacturer back-office RPA automation (WinActor), proposed RPA framework concept
• Chemical manufacturer experimental data visualization web app (Django, TypeScript, Plotly.js)
• Plan vs actual management web app (C# .NET, Outlook API integration)

Tech Stack: PHP (Laravel), Alteryx, SQL Server, Python (Django), WinActor, C# .NET

Independent Business Owner (2018-04 – 2018-09)

Spanish Cured Ham Import Business

• Investigated import business for Spanish cured ham
• Obtained company information from Spanish Embassy, negotiated locally, visited farms, conducted test imports
• Confirmed customs clearance, bacterial testing, logistics costs; conducted demand research (online reservation sales, crowdfunding, direct sales)
• Determined reaching break-even point difficult with own capital and planned borrowing; discontinued business

Sumitomo Chemical / R&D (2012-04 – 2018-03)

Medical-Grade PP Material Development (2016-11 – 2018-03) - Grade 2 / 4 members

• Medical-grade polypropylene material development
• Established composition for contact lens polymerization molds, developed materials for medical PP bottles
• Established UV-resistant grade composition

High Heat-Resistant PP Development (2015-06 – 2016-10) - Grade 1 / 30 members

• Basic research for battery separator material development
• Explored PP-based separator film materials, structural analysis
• Material development focused on heat resistance, puncture strength, microporous uniformity, porosity

PP Film Material Development Support (2012-04 – 2015-05) - Grade 1 / 30 members

• R&D support for polypropylene film
• Support experiments for packaging materials and battery separator development

Education

Tokyo University of Science, Department of Chemistry, Second Division (2014-04 – 2018-03)

• Attended university to advance my career while working at Sumitomo Chemical. Attended classes six days a week while working at Sumitomo Chemical, studying organic chemistry and earning a bachelor's degree.

Certifications

• 2012: Ordinary Driver's License
• Oct 2011: Class 1 Water Quality Pollution Prevention Manager
• Aug 2011: Class A Hazardous Materials Handler
• Oct 2010: Second-Class Electrician
• Jul 2010: Boiler Operator (Type II)

Skills

• Languages: Japanese (Native), English (Conversational)
• Backend: Golang, Python, PHP
• Frontend: JavaScript / TypeScript, Astro, Svelte, React, SolidJS, NextJS
• Infrastructure: AWS, Pulumi, Linux, Docker, Kubernetes, Terraform
• Databases: MySQL, PostgreSQL, MongoDB, DynamoDB, Redis
• Other: Kafka, Spark

Personal Strengths

Initiative & Perseverance

• Earned bachelor's degree from Tokyo University of Science while working full-time at Sumitomo Chemical. Maintained rigorous schedule of working 7:00-16:00, commuting 2 hours, attending classes 18:00-21:10, and completing assignments/reports for 4 years without repeating.
• Continuously learning new technologies while building own services, actively sharing work on VPS/AWS and publishing results at https://yuta.dev.

Problem Recognition & Improvement Ability

• Submitted nearly 24 improvement proposals annually at previous job. Proactively identified and improved buried problems in familiar environments.
• In system development, consistently execute from problem discovery to solution examination.

Information Analysis Ability

• Analyzed experimental data in R&D work, compared with predictions, conducted additional measurements and discussions to derive answers.
• Demonstrated ability to discuss given information with team and accurately understand meaning of data and results.

Personal Projects (Selected)

• BikeHub — A mobile app for logging motorcycle fuel efficiency and reading bike news. After building and running its Java/JSP predecessor "バイク燃費.com" solo, rebuilt it as a successor with a Django (DRF) backend API and a React Native (Expo) client, and shipped it on both the App Store and Google Play. The service has since ended.
• SAVE EAT — A support site for restaurants during the COVID-19 pandemic — built and launched within one week and operated with Docker Compose. The service has since ended.