Front-End Engineer and AI Web Developer

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WORK EXPERIENCE

AYUMI SUMITOMO As of October 8, 2026

PROFESSIONAL SUMMARY

I have approximately eight years of experience in front-end development and the development of websites, web services, and business systems. I started my career in web design and later expanded into front-end engineering. My experience includes web application development using React, Next.js, and TypeScript, as well as UI/UX design and API integration. I have also worked on back-end development with Python and Go and on cloud environment setup using AWS, handling work from requirements clarification and design through implementation, testing, deployment, release, and post-release improvements. In Unity/C# game development, I implemented in-game behavior and state transitions, including character movement and jumping.

In AI, I contributed as the front-end developer on a three-person team building Scoutless, a recruitment SaaS using generative AI and RPA, from initial planning through launch. I also worked on an AI proof of concept using LLM and OCR to assess whether quasi-drug ingredients complied with standards by comparing PDF specifications and related documents. At Brain Technologies, I have supported QA for Natural AI Phone through testing, defect verification, and documentation. This combination of product development and quality assurance is one of my strengths. I also prepare technical documentation, design documents, test specifications, and manuals, and can handle document preparation, data organization, aggregation, comparison, and checking using Excel and Word. My Excel experience includes VLOOKUP, XLOOKUP, IF, SUMIF/SUMIFS, PivotTables, and VBA. I am comfortable learning the technologies and knowledge required for a project and contributing from planning and development through testing, launch, and continuous improvement.

PROFESSIONAL EXPERIENCE

FLARETECH Co., Ltd. (Contract)

Project: AI System for Standards Compliance Assessment of Quasi-Drug Ingredients (LLM Integration) Period: Apr 2026 – Jun 2026 Team size: 1

Project Overview

Developed a proof of concept (PoC) AI system that used an LLM to assess compliance with the Japanese Standards of Quasi-Drug Ingredients (Gai-Gen-Ki 2021) by comparing standards against product specifications and test reports. The workflow covered PDF upload, OCR extraction, document comparison, compliance assessment, and PDF report generation. Worked through requirements and specification reviews, design, implementation, testing, and launch. Technologies & Tools: Front end: Next.js, TypeScript, Tailwind CSS; Back end: Python, FastAPI; AI: LLM, Kiro, knowledge base; OCR: DXSuite API; Infrastructure: AWS EC2, S3; CI/CD and source control: GitLab, GitLab CI/CD; Environment: Docker, Cursor

Phases: Requirements definition and specification review, basic and detailed design, implementation, API and AI integration, testing, CI/CD, launch

Responsibilities

• Clarified requirements and specifications with the client.

• Designed the data flow from PDF upload and OCR through LLM assessment and result display.

• Designed and implemented list/detail screens, search and filtering, and a two-dimensional comparison table for standards and test methods.

• Developed front-end features using Next.js and TypeScript and back-end APIs using Python and FastAPI.

• Integrated DXSuite API for PDF OCR and implemented LLM-based document comparison and assessment.

• Implemented result labels of “OK,” “NG,” and “Needs Review,” including reasons and PDF output.

• Configured AWS EC2/S3 integration, Docker development environment, and automated deployment with GitLab CI/CD.

• Tested functionality, fixed defects, incorporated client feedback, and supported launch. Achievements

• Built a PoC that compares ingredient standards with product specifications and test reports.

• Implemented LLM-based assessments with “OK / NG / Needs Review” results and a comparison-table UI.

• Systematized the workflow from PDF upload and OCR to document comparison, AI assessment, and result review.

• Delivered the PoC end-to-end, from requirements and design through development, testing, and launch. Brain Technologies (Full-time)

Project: QA and Quality Verification for the AI Smartphone “Natural AI Phone” Period: Jun 2025 – Present Team size: 18

Project Overview

Perform QA and testing to improve the quality of Natural AI Phone, an AI-powered smartphone. Verify functions, screens, and user flows; organize and report test results; confirm specifications with developers; communicate defects; and prepare documentation. Support coordination between QA and development teams, including communication with domestic and international team members.

Technologies & Tools: AI smartphone, Firebase, App Tester, Jira, Slack, Google Workspace, Microsoft Excel Page 2

Phases: Test design and execution, defect verification, quality checks, specification confirmation, documentation Responsibilities

• Test smartphone features, screens, and user interaction flows based on test cases.

• Verify quality of features that include AI functionality and check UI/UX behavior.

• Reproduce defects and investigate their conditions and possible causes.

• Document defects, reproduction steps, test results, and relevant specifications.

• Report issues and feedback to developers and align understanding of requirements.

• Coordinate with domestic and international developers and track test progress and issues.

• Suggest improvements to support product quality. Achievements

• Gained broad hands-on experience in QA and quality verification for an AI smartphone and its features.

• Tested complex user flows with real-world usage scenarios in mind.

• Shared clear defect reproduction conditions to help developers investigate and fix issues.

• Supported communication, documentation, and quality management across QA and development. Cloud Link Co., Ltd. (Contract)

Project: AI Agent Development — Recruitment Scouting RPA (Scoutless) Period: Oct 2024 – Dec 2025 Team size: 3

Project Overview

Developed a SaaS product using generative AI to streamline candidate scouting based on job and candidate information collected from recruitment platforms. Joined during the early planning and development stages and contributed through launch as the sole front-end developer on a three-person team. Technologies & Tools: Front end: Next.js, TypeScript, JavaScript, Material UI, Tailwind CSS; Back end/API: Python, Go, API integration; AWS: EC2, S3, Amplify, RDS, SQS, Cognito; Tools: GitHub, documentation Phases: Requirements definition, design, UI/UX, implementation, API/data integration, testing, improvement, launch Responsibilities

• Clarified service requirements and designed overall screens and UI/UX, including designs using Figma.

• Implemented front-end features and UI components using Next.js, TypeScript, Tailwind CSS, and Material UI.

• Integrated APIs built with Python and Go to retrieve, register, and update job and candidate data.

• Implemented data collection and scraping for eight recruitment platforms.

• Developed forms, list/detail screens, and related data workflows.

• Coordinated API specifications, data structures, and screen behavior with back-end developers.

• Improved responsive behavior, accessibility, and performance by reducing unnecessary re-renders and optimizing images and JavaScript.

• Handled tests, defect fixes, documentation, and post-release UI/UX improvements. Achievements

• Owned front-end development in a three-person team from requirements and design through implementation, testing, improvements, and launch.

• Implemented scraping to collect job information from eight recruitment platforms.

• Integrated Python/Go APIs for core job and candidate data operations.

• Helped bring generative-AI scouting message features into a usable web service.

• Contributed to the launch of a SaaS product from its early development stage. M&G; Co., Ltd. (Contract)

Project: HIPSHOP E-commerce Website Development and Improvement Period: Apr 2024 – Sep 2024 Team size: 1

Project Overview

Customized the Shopify theme and improved UI/UX and performance for the official e-commerce site of HIPSHOP, an underwear brand. Worked independently on front-end development to improve the existing site's appearance, usability, and operational efficiency.

Technologies & Tools: Shopify, Liquid, HTML, CSS, JavaScript, Git Phases: Implementation, testing, performance optimization, UI/UX improvement, operational improvement Responsibilities

• Customized Shopify themes and modified templates using Liquid.

• Adjusted layouts and styling with HTML/CSS and implemented interactions using JavaScript.

• Improved product listing and detail pages and responsive layouts.

• Checked behavior across browsers and devices and investigated/fixed defects.

• Improved page speed and front-end performance and streamlined site operations. Achievements

• Improved UI and design to better match the brand identity.

• Enhanced usability on both desktop and mobile devices through responsive and UI improvements. Page 3

• Handled requirements confirmation, implementation, testing, and improvements independently. Per-Fact Co., Ltd. (Contract)

Project: Corporate Website Development and Improvement Period: Mar 2023 – Mar 2024 Team size: 3

Project Overview

Developed and maintained a corporate website, including new pages and improvements to existing content. Worked across website design, UI/UX, front-end implementation, content updates, display verification, and ongoing improvements.

Technologies & Tools: WordPress, HTML, CSS, JavaScript, PHP, Git, Photoshop, Illustrator Phases: Requirements review, design, UI/UX, development, testing, operation and improvement Responsibilities

• Designed pages and UI for the corporate website and built pages using WordPress.

• Implemented front-end features using HTML, CSS, and JavaScript.

• Customized WordPress themes and pages and supported responsive layouts.

• Updated content and images, checked rendering across browsers/devices, and fixed defects.

• Maintained and improved the website after publication. Achievements

• Contributed to corporate website creation and operation using WordPress.

• Handled work from design and front-end implementation through post-launch improvements.

• Improved readability and usability from the user's perspective. CMC Global (Full-time)

Project: Large-Scale Web and Business System Development Period: Oct 2021 – Jan 2023 Team size: 12

Project Overview

Developed new features, improvements, and maintenance updates for enterprise web and business systems, including complex screen and feature design, implementation, testing, and enhancements to existing functionality. Technologies & Tools: HTML, CSS, JavaScript, TypeScript, React, REST API, MySQL, Git, GitHub, Jira, Figma Phases: Requirements/specification review, design, development, testing, maintenance and improvement Responsibilities

• Reviewed requirements and specifications and designed UI/UX.

• Designed and implemented front-end features using JavaScript and TypeScript.

• Integrated REST APIs and modified existing features.

• Investigated and fixed defects, tested changes, and checked quality.

• Coordinated specifications and implementation with the development team and supported post-release maintenance. Achievements

• Worked across requirements, design, development, testing, maintenance, and improvement.

• Implemented complex front-end screens and features.

• Built experience in maintainable, quality-focused development and user-centered system improvements. CMC Global (Full-time)

Project: Web Service Front-End Development

Period: Jan 2021 – Oct 2021 Team size: 10

Project Overview

Developed new features and improved existing functionality for web services. Expanded responsibilities as a front-end engineer from screen design through implementation and testing, including API integration, dynamic UI, and performance improvements.

Technologies & Tools: HTML, CSS, JavaScript, Vue.js, PHP, Laravel, MySQL, Jira, Figma, Git Phases: Design, development, testing, improvement

Responsibilities

• Designed screens and implemented front-end features.

• Built dynamic UI behavior with JavaScript and integrated API data.

• Improved UI/UX, responsive layouts, and page performance.

• Tested changes, fixed defects, and improved existing features. Achievements

• Worked on both new feature development and improvements to existing web services.

• Strengthened front-end development skills including API integration.

• Delivered improvements considering both UI/UX and performance. Page 4

CMC Global (Full-time)

Project: Business Web System Development

Period: May 2020 – Dec 2020 Team size: 8

Project Overview

Developed and improved business web systems for enterprise users, including screen development with JavaScript, updates to existing features, and API integration. Technologies & Tools: HTML, CSS, JavaScript, PHP, MySQL, jQuery, Git Phases: Design, development, testing, maintenance and improvement Responsibilities

• Designed and implemented web screens, forms, list views, and detail views.

• Developed front-end features using HTML, CSS, and JavaScript.

• Integrated APIs and improved UI/UX and existing functionality.

• Tested behavior, investigated and fixed defects, and supported post-release maintenance. Achievements

• Expanded from website production into business web system development.

• Gained experience developing dynamic screens and features with JavaScript.

• Applied UI/UX knowledge to improve usability.

CMC Global (Full-time)

Project: 2D/3D Game Development with Unity and C# (AMETA Game / ArmyAntz Game) Period: Mar 2019 – Apr 2020 Team size: 3

Project Overview

Worked on 3D game development using Unity, implementing game features primarily in C#, including in-game functionality, UI, and character/unit-related behavior. Technologies & Tools: Unity, C#, Shader

Phases: Implementation, testing, deployment

Responsibilities

• Implemented game features and logic using Unity and C#.

• Developed character- and unit-related functionality and UI/game screens.

• Modified and tuned existing features.

• Tested behavior, fixed defects, and supported game deployment. Achievements

• Participated in real-world 3D game development through deployment.

• Experienced the full cycle of implementing, testing, fixing, and deploying game features. CMC Global (Full-time)

Project: Website Redesign and UI/UX Improvement

Period: Nov 2018 – Feb 2019 Team size: 6

Project Overview

Redesigned an existing website and improved UI/UX. Expanded responsibilities beyond web design into front-end implementation, with attention to usability and information readability. Technologies & Tools: HTML, CSS, JavaScript, jQuery, Bootstrap, Git, Photoshop Phases: UI design, front-end development, testing, improvement Responsibilities

• Improved existing website UI and designed page layouts.

• Implemented front-end changes using HTML, CSS, and JavaScript.

• Handled responsive layouts, cross-browser testing, and defect fixes.

• Adjusted and improved existing UI.

Achievements

• Expanded work from web design into front-end implementation.

• Improved usability and information readability from the user's perspective.

• Used Git for team development and change management. CMC Global (Full-time)

Project: Corporate Website Design and Development

Period: Aug 2018 – Oct 2018 Team size: 5

Project Overview

As an initial project after joining the company, designed and produced corporate websites. Learned and applied the website production workflow, from page layout and UI design to HTML/CSS coding and simple JavaScript interactions. Page 5

Technologies & Tools: HTML, CSS, JavaScript, Photoshop, Illustrator Phases: Design, UI design, coding, testing

Responsibilities

• Designed websites, page layouts, and UI.

• Coded pages using HTML and CSS and implemented simple interactions with JavaScript.

• Created web assets such as images and banners.

• Handled responsive layouts and checked display across browsers and devices. Achievements

• Experienced the full website production process from design and coding through testing.

• Built HTML/CSS implementation skills based on design intent.

• Created responsive pages for different screen sizes. TECHNICAL SKILLS

Category Skills / Experience

Languages HTML (3 years); CSS (3 years); JavaScript (8 years); TypeScript (6 years); C# (1 year); PHP

(2 years); Python (1 year); Go (1 year)

Databases MySQL (2 years); MongoDB (6 months)

Libraries / Frameworks React (4 years); Vue.js (3 years); Next.js (3 years); Angular (1 year); Laravel (2 years); Node.js (1 year); FastAPI (1 year); Unity (1 year) Cloud AWS (1 year)

Tools / Platforms Git, GitHub, GitLab, GitLab CI/CD, Docker, Figma, Photoshop, Illustrator, WordPress, Shopify, Liquid, Jira, Slack, Google Workspace, Microsoft Excel, Microsoft Word PORTFOLIO

https://ayumi-personal.vercel.app/

SELECTED PRODUCTS AND SERVICES

Scoutless — A recruitment scouting SaaS using generative AI and RPA. I worked on front-end development from early-stage planning through requirements, UI/UX, implementation, API integration, testing, improvements, and release. https://scoutless.cloudlinkgroup.co.jp/

https://scoutless.aidea-hd.co.jp/?utm_source

https://boxil.jp/service/50551/?via=yr-serviceLink-services&utm_source Natural AI Phone — An AI smartphone developed by Brain Technologies and officially released in Japan on April 24, 2026. I supported launch quality through QA testing, defect verification, and documentation. https://www.softbank.jp/mobile/products/smartphone/natural-ai-phone/?utm_source HIPSHOP (E-commerce Website) — Contributed to the development and improvement of the HIPSHOP e-commerce site. https://hipshop.jp/

https://hipshop.jp/collections/onepiece

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