【LINEヤフーグループ】Product Designer｜国内最大級デジタルサービス

📍 Job Overview

Job Title: Product Designer (LINE Yahoo Group)

Company: GAIDOOR株式会社

Location: Chuo, Tokyo, Japan (Full Remote Option Available)

Job Type: Permanent Full Time

Category: Product Design / UX/UI

Date Posted: November 2, 2026

Experience Level: Mid-Level (3+ years)

Remote Status: Hybrid Work Possible (Full Remote Option Available)

🚀 Role Summary

• Lead user experience design and product growth initiatives for a leading digital service within the LINE Yahoo Group.

• Drive product development from user research and hypothesis validation through to post-release analysis and iteration.

• Collaborate closely with Product Managers, Engineers, and Business members to deliver impactful user experiences.

• Design and maintain scalable design systems to ensure consistency and efficiency across product development.

• Contribute to the strategic direction of product design, focusing on both user satisfaction and business objectives.

📝 Enhancement Note: This role is positioned as a key contributor within a large, established digital service. The emphasis on "leading growth" and "deeply involved in the entire product development process" suggests a mid-to-senior level Product Designer with a strategic mindset and a proven ability to influence product direction. The requirement for Japanese native-level communication is critical for cross-functional collaboration within the Japanese market.

📈 Primary Responsibilities

• Conduct user research and user testing to identify pain points and opportunities for UX improvement.

• Create UI designs and interactive prototypes using Figma and other relevant tools.

• Develop, implement, and maintain a robust design system for consistent user experiences and efficient development.

• Facilitate requirement gathering and drive product development cycles in close partnership with Product Managers and Engineers.

• Analyze post-release data, measure effectiveness, and propose data-driven improvements to product features.

• Leverage user feedback to continuously refine and enhance the product's user experience.

• Optimize information architecture, interaction design, and the overall user journey.

• Contribute to the strategic vision of the product by aligning user needs with business goals.

• Participate in and potentially lead design system evolution and product growth initiatives.

• Collaborate with cross-functional teams to ensure design integrity and successful product launches.

📝 Enhancement Note: The responsibilities highlight a comprehensive Product Designer role, extending beyond UI to encompass the entire product lifecycle. The mention of "product growth" and "business value" indicates an expectation for designers to understand and contribute to commercial success, not just aesthetic or usability improvements.

🎓 Skills & Qualifications

Education: Specific educational requirements are not listed, but a Bachelor's degree in Design, Human-Computer Interaction, or a related field is often preferred. Equivalent practical experience will likely be considered.

Experience: Minimum of 3 years of professional experience as a Product Designer for web services or mobile applications.

Required Skills:

• Proven experience as a Product Designer for web services or mobile applications (3+ years).

• Proficiency in UI design using tools such as Figma.

• Practical experience in information architecture and UI design.

• Demonstrated ability to translate user challenges into effective UI solutions based on logical thinking.

• Ability to present a portfolio that clearly articulates thought processes and design decisions.

• Native-level Japanese language proficiency for effective communication. Preferred Skills:

• Experience in UI/UX improvement for B2C services.

• Experience in building and managing design systems.

• Expertise in interaction design.

• Practical experience with prototyping tools.

• Experience in UI improvement driven by data analysis.

• Involvement in product growth initiatives.

📝 Enhancement Note: The "required" skills emphasize core product design competencies, while "preferred" skills point towards areas of strategic importance for the company, such as B2C experience, design systems, and data-driven product growth. The portfolio requirement is crucial and should showcase problem-solving skills and design rationale.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A comprehensive portfolio is mandatory, demonstrating the candidate's thought process from problem identification to solution implementation.

• Showcase specific examples of translating user research and logical analysis into tangible UI designs.

• Include case studies detailing the design of user flows, information architecture, and UI elements.

• Highlight contributions to product growth or UX improvement initiatives with measurable outcomes.

• Demonstrate proficiency with design tools, particularly Figma, through the submitted work. Process Documentation:

• Expect to articulate your design process, including user research methodologies, ideation techniques, prototyping, and validation steps.

• Be prepared to discuss how you collaborate with Product Managers and Engineers throughout the development lifecycle.

• Showcase experience with iterative design, including post-release analysis and continuous improvement cycles.

• Demonstrate understanding of design system principles and how they are applied in practice.

📝 Enhancement Note: The emphasis on "thought process" and "logical thinking" in the portfolio requirement suggests the company values a structured, problem-solving approach to design over purely aesthetic output. Candidates should prepare to walk through their case studies, explaining the "why" behind their design decisions.

💵 Compensation & Benefits

Salary Range: JPY 5,520,000 - JPY 10,080,000 per year. This range is based on the provided figures and will be determined by experience and skills. A 3-month probationary period applies with no changes to benefits.

Benefits:

• Comprehensive Social Insurance coverage.

• Transportation allowance provided.

• Hybrid work system available.

• Flextime system in place.

• Company-provided PC.

• Subsidy for book purchases.

• Various training programs and internal study groups.

• Side jobs are permitted (subject to company regulations).

Working Hours: 40 hours per week, with a flextime system allowing for flexible scheduling.

📝 Enhancement Note: The salary range is competitive for a mid-level Product Designer in Japan, especially within a large group like LINE Yahoo. The benefits package is standard for tech companies in Japan, with the inclusion of hybrid work and flextime being attractive for work-life balance. The mention of "full remote option available" alongside "hybrid work possible" suggests flexibility, though the primary office location is in Tokyo.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Digital Services / Internet

Company Size: The specific size of GAIDOOR株式会社 is not detailed, but as a company operating within the LINE Yahoo Group, it benefits from the scale and resources of a major Japanese tech conglomerate. This implies a structured environment with opportunities for large-scale impact.

Founded: Founded in 2021, GAIDOOR is a relatively young company, suggesting a dynamic and evolving organizational culture, while its affiliation with LINE Yahoo provides stability and a strong market presence.

Team Structure:

• The Product Design team is being strengthened to support product growth.

• Designers work closely with Product Managers (PdMs), Engineers, and Business members, indicating a collaborative, cross-functional environment.

• The structure likely involves specialized roles within design, such as UX researchers, UI designers, and design system specialists, all contributing to the overall product development process. Methodology:

• The company emphasizes a user-centric approach, aiming to enable users to make better decisions.

• Product development is driven by close collaboration between Product, Design, Engineering, and Business teams.

• There's a strong focus on continuous improvement and creating new value through iterative design and data analysis.

• Global expansion is an active strategy, suggesting an outward-looking and growth-oriented mindset.

Company Website: https://www.gaidoor.co.jp

📝 Enhancement Note: Operating under the LINE Yahoo umbrella provides a blend of established corporate structure and the agility of a growing tech firm. The culture appears to value collaboration, user focus, and continuous innovation, aligning with modern product development best practices.

📈 Career & Growth Analysis

Operations Career Level: This role is for a mid-level Product Designer (3+ years of experience), focused on hands-on design execution and strategic input. It offers the opportunity to transition into senior design roles, potentially specializing in areas like UX research, design systems, or product growth strategy.

Reporting Structure: While not explicitly detailed, Product Designers typically report to a Design Lead, Head of Design, or Product Management lead, working within a cross-functional product team. The emphasis on close collaboration suggests direct interaction with PdMs and engineers.

Operations Impact: Designers in this role have a direct and significant impact on the user experience of a major digital service used by millions. Their work influences user engagement, satisfaction, and retention, which in turn drives business growth and revenue. The focus on product growth and business value means designers are expected to contribute measurably to commercial success.

Growth Opportunities:

• Skill Advancement: Deepen expertise in UX research, interaction design, design systems, and data-driven product growth. Opportunities to lead specific design initiatives or feature development.

• Leadership Potential: Progress to Senior Product Designer, Design Lead, or specialized roles within the design organization. Potential to mentor junior designers.

• Cross-Functional Exposure: Gain experience working on global product strategies and potentially new service development, broadening understanding of business operations and market dynamics.

• Learning & Development: Access to training programs, internal study groups, and book purchase subsidies to foster continuous learning.

📝 Enhancement Note: The role offers a clear path for career progression within a large organization. The opportunity to work on a high-impact digital service and engage in strategic initiatives like product growth and design systems provides significant professional development.

🌐 Work Environment

Office Type: The primary office is located in Tsukiji, Tokyo. The company offers a hybrid work system and a full remote option, providing flexibility for employees. This setup caters to a modern workforce that values autonomy and work-life balance.

Office Location(s): The main office is in Chuo Ward, Tokyo. This is a central business district, easily accessible by public transportation.

Workspace Context:

• The environment is designed for collaboration, with close proximity and communication channels between Product Designers, Product Managers, and Engineers.

• The available tools (Figma, Notion, Miro, Slack) facilitate seamless remote and in-office collaboration, digital whiteboarding, and project management.

• Opportunities exist to engage with a diverse team of professionals, fostering a dynamic and innovative atmosphere.

Work Schedule: A flextime system is in place, allowing employees to adjust their start and end times within core working hours, supporting personal commitments and optimizing productivity. The standard working hours are 40 per week.

📝 Enhancement Note: The hybrid and remote options, combined with flextime, indicate a modern, employee-centric work environment. This flexibility is crucial for attracting and retaining top talent in the competitive tech industry.

📄 Application & Portfolio Review Process

Interview Process:

• Stage 1: Document Screening: Review of resume and portfolio to assess qualifications and experience.

• Stage 2: Interviews (2-3): Typically includes interviews with hiring managers, design leads, and potentially cross-functional team members (PdM, Engineering). Expect discussions on design philosophy, past projects, problem-solving approaches, and cultural fit.

• Stage 3: Offer: Final offer extended upon successful completion of interviews.

Portfolio Review Tips:

• Structure: Organize your portfolio with clear case studies for 2-3 significant projects. For each project, detail the problem, your role, the process, your decisions (and the reasoning behind them), and the outcomes.

• Focus on Process: Emphasize your thought process, research methodologies, and how you translated user needs and business goals into design solutions. Show wireframes, user flows, prototypes, and final UI, explaining the evolution.

• Quantify Impact: Where possible, use data to demonstrate the success of your designs (e.g., increased conversion rates, improved user satisfaction scores, reduced task completion times).

• Tool Proficiency: Clearly show your expertise with Figma and other relevant design/prototyping tools.

• Presentation: Be prepared to present your portfolio verbally during interviews, articulating your contributions and decision-making clearly and concisely.

Challenge Preparation:

• While not explicitly mentioned, some companies may include a design challenge or take-home exercise. If so, focus on understanding the brief, prioritizing tasks within the given timeframe, and clearly articulating your design rationale and proposed solutions.

• Prepare to discuss your experience working within agile development environments and collaborating with engineers.

📝 Enhancement Note: The portfolio is a critical component. Candidates should prepare a portfolio that not only showcases their design skills but also their strategic thinking, problem-solving abilities, and understanding of the product development lifecycle. The emphasis on "logical thinking" and "user-first" approach should be evident throughout.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: The core tool for UI design and prototyping. Proficiency is essential.

• STUDIO: Another design tool used, potentially for website design or specific workflows.

• Adobe Creative Cloud (Illustrator / Photoshop): Standard tools for asset creation, image editing, and graphic design tasks.

Analytics & Reporting:

• While not explicitly listed, experience with data analysis tools (e.g., Google Analytics, Amplitude, Mixpanel) and the ability to interpret data for design decisions is highly valued. CRM & Automation:

• Not directly applicable to this Product Designer role, but understanding how design impacts user journeys within CRM and marketing automation contexts can be a plus. Collaboration & Documentation:

• Slack: For real-time communication.

• Notion: For documentation, project management, and knowledge sharing.

• Miro: For collaborative whiteboarding, brainstorming, and user journey mapping.

📝 Enhancement Note: The technology stack is modern and standard for digital product design teams. Proficiency in Figma is non-negotiable. Experience with data analytics tools and collaboration platforms will enhance a candidate's suitability.

👥 Team Culture & Values

Operations Values:

• User-Centricity: A primary value, focusing on understanding and addressing user needs to enable better decision-making.

• Collaboration: Strong emphasis on close teamwork between Product, Design, Engineering, and Business functions.

• Continuous Improvement: A commitment to iterative development, learning from data, and constantly seeking new ways to add value.

• Growth Mindset: Encouraging new challenges, global expansion, and embracing change.

• Precision & Quality: Dedication to detail in design, aiming for high-quality user experiences and robust design systems.

Collaboration Style:

• Cross-Functional Integration: Designers are integral members of product teams, working hand-in-hand with PdMs and Engineers from ideation to launch.

• Open Communication: Utilizes tools like Slack and Notion for transparent communication and knowledge sharing. Miro is used for collaborative ideation sessions.

• Feedback Loops: A culture that embraces constructive feedback to refine designs and processes, fostering a learning environment.

📝 Enhancement Note: The company culture appears to be a blend of large-corporation structure (LINE Yahoo Group) and the agility expected of a growing tech company. The emphasis on user-centricity and cross-functional collaboration aligns well with modern product development practices.

⚡ Challenges & Growth Opportunities

Challenges:

• Scaling User Experience: Designing for a large-scale digital service with millions of users presents unique challenges in consistency, performance, and accessibility.

• Balancing User Needs and Business Goals: Effectively integrating user desires with business objectives and revenue targets requires strategic design thinking.

• Evolving Design Systems: Keeping design systems up-to-date and scalable as the product and team grow requires proactive management.

• Adapting to New Technologies/Trends: Staying abreast of emerging design trends, tools, and user behaviors in the fast-paced digital landscape.

Learning & Development Opportunities:

• Specialization: Opportunity to become an expert in specific areas like advanced UX research, interaction design, or design system architecture.

• Product Growth: Deep dive into product analytics and growth hacking methodologies to drive user acquisition, engagement, and retention.

• Cross-Disciplinary Learning: Gaining insights into product management, business strategy, and engineering processes through close collaboration.

• Formal Training: Access to company-provided training programs, workshops, and potentially external conferences or certifications.

• Mentorship: Potential to be mentored by senior designers or to mentor junior team members as the design organization matures.

📝 Enhancement Note: This role offers significant opportunities for professional growth by tackling complex challenges within a large-scale digital product and benefiting from structured learning and development programs.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you identified a significant user problem through research and how you translated that into a successful UI solution." (Focus on your process, data used, and outcome.)

• "How do you balance user needs with business objectives when designing features? Provide an example." (Highlight your ability to think strategically and find win-win solutions.)

• "Walk us through your process for designing and implementing a new feature for a large-scale web service." (Detail your steps from research to post-launch analysis.)

• "How would you contribute to or evolve an existing design system?" (Showcase your understanding of design system principles and practical application.) Company & Culture Questions:

• "What interests you about working for a LINE Yahoo Group company and this specific digital service?" (Research the company's mission and recent developments.)

• "How do you approach collaboration with Product Managers and Engineers?" (Emphasize your communication style and teamwork approach.)

• "Describe a situation where you had to persuade stakeholders to adopt your design recommendation." (Focus on your communication and negotiation skills.) Portfolio Presentation Strategy:

• Storytelling: Frame your case studies as narratives, guiding the interviewer through the problem, your journey, and the impact.

• Visual Clarity: Ensure your visuals are clean, well-annotated, and easy to understand.

• Quantifiable Results: Always aim to include metrics and data to back up your claims of success.

• Conciseness: Be prepared to present your key projects within a given timeframe (e.g., 15-20 minutes). Focus on the most relevant aspects for this role.

• Q&A Readiness: Anticipate questions about your design choices, challenges faced, and alternative solutions considered.

📝 Enhancement Note: Interview preparation should focus on demonstrating a strong understanding of the end-to-end product design process, a user-centric yet business-aware mindset, and excellent communication skills, supported by a compelling portfolio.

📌 Application Steps

To apply for this Product Designer position:

• Submit your application through the provided application link.

• Portfolio Customization: Tailor your portfolio to highlight projects that demonstrate experience with large-scale digital services, B2C products, and a comprehensive design process from research to post-launch analysis. Emphasize your use of Figma and any experience with design systems or product growth.

• Resume Optimization: Ensure your resume clearly outlines your 3+ years of relevant experience, using keywords such as "Product Designer," "UI/UX Design," "Information Architecture," "Figma," "User Research," and "Design Systems." Quantify achievements where possible.

• Interview Preparation: Practice articulating your design process, decision-making rationale, and project outcomes. Be ready to discuss your experience with cross-functional collaboration and how you approach user problems logically.

• Company Research: Familiarize yourself with GAIDOOR株式会社, the LINE Yahoo Group, and the specific digital services they operate. Understand their mission, values, and recent product developments to tailor your responses and demonstrate genuine interest.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.