Software Engineering • Web Development • Mobile Development • Human-Computer Interaction (HCI) • Data Science • UI/UX Product Design • Motion Graphics Design • 3D Modeling & Animation

ユリディラン　ベルナ

📍 Tokyo, Japan

✉️ [email protected]

https://bernayildiran.notion.site/

https://github.com/brnyildiran

https://linkedin.com/in/berna-yildiran/

<aside> 🌿 I am a front-end developer with experience in web development using Next.js and Tailwind, as well as mobile app development using Flutter and Dart. I am also exploring full-stack development. With a strong background in design, I excel in UI/UX design and software development projects, working both independently and collaboratively within teams. I place great importance on communication, especially in multicultural environments, and act as a bridge between development and design teams to ensure technical feasibility and pixel-perfect implementation of design specifications. Additionally, I have experience with backend development languages such as Python, C++, C#, and Java. My skills also extend to 3D modeling, animation, motion graphics, and graphic design, allowing me to contribute to projects from multiple perspectives.

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Skills

Work Experience

Human Resocia Co., Ltd. | Mar 2023 – Present | Tokyo, Japan Software Engineer ・ UI/UX Product Designer

• Attended Japanese language and business manners training 40 hours a week for a year.
• Worked as a contracted software engineer at a client companies.

<aside> 📎 System Support Co., Ltd. | Feb 2025 – Present | Kanazawa, Japan (Hybrid) Full Stack Developer

• All documents, emails, and conversations are in Japanese.

CRM System for Kitanihon-Kako Co., Ltd. | Feb 2025 – Present

• Developed a web-based CRM system using React (TypeScript) for the frontend and Next.js for server-side rendering and API development.
• Designed and implemented REST APIs to support backend functionalities in a containerized development environment on Ubuntu with Docker.
• Analyzed requirements and determined implementation strategies based on basic design-level specifications written in Japanese.
• Built a modern, responsive UI using Tailwind CSS and Material UI, ensuring a clean and responsive interface.
• Collaborated with a fully remote, Japanese-speaking development team of 6, maintaining smooth communication and a seamless workflow.

NEC Corporation | Apr 2024 – Jan 2025 | Tokyo, Japan (Remote) Frontend Developer ・ UI/UX Product Designer

• All documents, emails, and conversations are in Japanese.

Vacant House Management System | Jan 2025

• Designed a web-based Vacant House Management System to streamline property registration, search, and management, improving collaboration between municipal authorities and field investigators by centralizing property data and survey results.
• Optimized the vacant house discovery and management process, handling resident reports, on-site surveys, and improving data accuracy and accessibility with customizable fields.
• Created a map-based listing interface with interactive markers, filters, and a split-screen layout for enhanced navigation and property discovery.
• Designed a responsive UI in Figma for desktop and tablet (15 screens × 2 sizes), ensuring usability across screen sizes. Applied a cohesive design system with clear typography, color schemes, and reusable components for an intuitive and consistent user experience.

Statutory Planning Support System (Generative AI System) | Nov 2024 – Jan 2025

• Designed and developed the interface for an AI chatbot system to assist in legal planning documentation, enabling seamless switching between free chat and template-driven interactions via toggle controls.
• Conducted domain-specific research to refine prompt template parameters, enhancing AI response accuracy.
• Designed a 42-screen web application from scratch in Figma, supporting both Japanese and English versions, and created a reusable component-based design system for consistency.
• Developed an intuitive, single-screen navigation interface to optimize user efficiency and workflow.
• Built the initial prototype locally using OpenAI API endpoints and integrated LangChain’s memory and chat history features for context-aware RAG (Retrieval-Augmented Generation) functionality.
• Implemented next-intl for multilingual support and developed a responsive, user-friendly UX based on Figma designs.
• Key features included customizable templates, text generation, text enhancement, image analysis, and Q&A creation.
• Next.js, Tailwind CSS, JavaScript, TypeScript, LangChain, OpenAI GPT API, next-intl

Pre-Application System for Municipal Office Counter Services | Aug 2024 – Jan 2025

• Designed a new web application to enable residents to complete forms before visiting municipal offices, reducing wait times, in-person interactions, and staff workload.
• Independently led Figma-based design tasks, collaborating with Japanese planning teams (5 members) to define product specifications and conduct design reviews for feedback.
• Developed mobile-first designs from scratch in Figma, creating 82 screens in both English and Japanese, with responsive designs for mobile, tablet, desktop, and large desktop (82 screens × 4 sizes).
• Designed an intuitive and user-friendly interface accessible to all residents, aged 18 to elderly, ensuring ease of use.
• Created integration screens for seamless compatibility with the existing 窓口DXSaaS system for municipal offices.
• Built a reusable component-based design system and developed comprehensive flowcharts and Figma prototypes to visualize in-app flows and interactions.
• Adapted to evolving requirements, providing ongoing support for design changes and updates.

窓口DX SaaS Product for Municipal Office Counter Services | Apr 2024 – Jan 2025

• Independently led UI/UX design and frontend development tasks for a web-based resident application system used by municipalities, collaborating with a Japanese new business development team (8 members) to define product specifications and conduct design reviews.
• Redesigned 167 screens (both English and Japanese versions) from scratch in Figma to enhance the existing application’s UX and created a reusable component-based design system.
• Updated and debugged existing frontend code to develop a responsive UI and designed new UI components for additional features, such as e-signatures and an advanced form builder.
• Provided consulting and technical support to two outsourcing development companies (JPTokyo and JHC) for responsive frontend development, addressing design-related queries.
• Adapted to changing requirements, supporting design modifications and updates throughout the project.
• Next.js, Tailwind CSS, JavaScript, TypeScript </aside>

METI CONCEPT | Nov 2022 – Nov 2023 | La Louvière, Belgium Frontend Developer & UI/UX Product Designer (Freelance)

METI Box (V2) - Accounting Software Upgrade (Web & Mobile) | Aug 2023 – Nov 2023

• Revamped UI/UX, introduced new features, and optimized user flows to improve document exchange processes between accountants and clients, designing 249 screens for web and mobile platforms.
• Collaborated with a team of 5, including 3 web developers, and 2 mobile developers, to deliver the upgraded product.

METI Concept - In-House Website Development | May 2023 – Jul 2023

• Designed and developed a new company website, including logo redesign, brand identity, content production, and UI/UX design, while establishing a consistent design system and managing end-to-end processes.
• Created 90 screens in both English and French, with responsive designs for mobile small, standard mobile, tablet, desktop, and large desktop using Figma (9 screens × 5 sizes × 2 language).