Product Designer (UX), HCI

📍 Job Overview

Job Title: Product Designer (UX), HCI

Company: Bjak

Location: Seoul, South Korea

Job Type: FULL_TIME

Category: Product Design / UX / HCI

Date Posted: 2026-08-02

Experience Level: 2-5 Years

Remote Status: Hybrid (with remote flexibility within South Korea)

🚀 Role Summary

• Design innovative, AI-native user experiences for proactive assistant products that aim to significantly reduce user task completion time.

• Develop novel interaction models for human-AI workflows, focusing on user control, understanding, and trust in multi-step reasoning and action systems.

• Collaborate closely with Product, Engineering, and Machine Learning teams to translate complex AI capabilities into intuitive and reliable user interfaces for both web and mobile platforms.

• Drive the end-to-end design process, from conceptualization and wireframing to prototyping, high-fidelity design, and user research for continuous iteration.

📝 Enhancement Note: The role of Product Designer (UX), HCI at Bjak is positioned at the intersection of cutting-edge AI development and user-centric design. Given the company's mission to build AI-native applications that assist users with everyday tasks and workflows, this role requires a deep understanding of Human-Computer Interaction (HCI) principles, particularly as they apply to complex AI systems. The emphasis on "proactive smart assistant" and "real-world task completion" suggests a need for designers who can conceptualize and execute interfaces that manage AI's reasoning, context persistence, and interaction with external tools, ensuring user control and trust. The "2-5 Years" experience level indicates an expectation for candidates who can operate with some autonomy but also learn and grow within a fast-paced, collaborative environment.

📈 Primary Responsibilities

• Design end-to-end user experiences for AI product surfaces, from initial concept through to final shipped product, ensuring a seamless and intuitive user journey.

• Create and iterate on interaction patterns specifically for human-AI workflows, encompassing areas like intelligent prompting, progress review, confirmation mechanisms, error correction, task handoff, and system recovery.

• Develop user interfaces that provide clear visibility into the AI's current state, including its understanding, uncertainties, and anticipated next steps, fostering user comprehension and trust.

• Translate complex, multi-step AI capabilities and reasoning processes into user flows that are easily understandable, controllable, and practical for everyday use.

• Partner effectively with product managers, engineers, and machine learning specialists to collaboratively define problems, brainstorm solutions, conduct rapid testing, and ensure timely product delivery.

• Produce a range of design artifacts including wireframes, user flows, interactive prototypes, and high-fidelity visual designs optimized for both web and mobile platforms.

• Conduct lightweight, targeted user research and usability testing sessions to proactively identify user friction points, areas of distrust, and potential system failure modes.

• Contribute to the definition and establishment of reusable Human-Computer Interaction (HCI) design patterns, supporting the maturation of the product and the company's design system.

📝 Enhancement Note: The responsibilities highlight a focus on designing for AI's unique challenges: lack of transparency, potential for unexpected behavior, and the need for user trust. This goes beyond traditional UX and delves into creating interfaces that manage complex AI interactions, requiring a strong understanding of AI's capabilities and limitations. The emphasis on "producing wireframes, flows, prototypes, and high-fidelity designs for web and mobile" indicates a hands-on design role, while "running lightweight user research and usability tests" points to an iterative design approach grounded in user feedback.

🎓 Skills & Qualifications

Education: Bachelor's degree in Human-Computer Interaction (HCI), Interaction Design, Graphic Design, Computer Science, or a related field, or equivalent practical experience.

Experience: 2-5 years of experience in product design or UX design roles, with a demonstrable track record of shipping successful web or mobile products.

Required Skills:

• Proven experience in interaction design, with a strong ability to define intuitive and effective user flows for complex systems.

• Expertise in information hierarchy, ensuring clarity and logical organization of content and features within interfaces.

• Proficiency in prototyping tools, specifically Figma, for rapid iteration and the creation of interactive design mockups.

• Demonstrated ability to simplify complex systems and translate ambiguous product behaviors into clear, user-friendly experiences.

• Experience collaborating effectively with product managers and engineers in fast-paced, agile development environments.

• Comfort and adaptability in working with ambiguity, and the capacity to shape solutions when requirements are not fully defined.

• Strong judgment regarding usability, identifying and addressing potential edge cases and designing robust failure handling mechanisms.

• Clear articulation and application of principles related to trust, control, feedback, and transparency within AI-driven user experiences. Preferred Skills:

• Experience designing for AI-powered products or systems.

• Familiarity with HCI research methodologies and applying user research findings to design decisions.

• Understanding of design systems and experience contributing to their development.

• Knowledge of front-end development principles (HTML, CSS, JavaScript) to better inform design feasibility.

• Experience in a startup environment, demonstrating a proactive and results-oriented approach.

📝 Enhancement Note: The qualifications emphasize practical design skills (Figma, prototyping, interaction design) combined with a conceptual understanding of AI and its user implications (trust, control, transparency). The "2-5 years" experience level suggests that candidates should have moved beyond foundational skills and can demonstrate independent problem-solving and design contribution. The mention of "ambiguity" and "shaping solutions before requirements are fully defined" is characteristic of early-stage product development and requires designers who are comfortable with iterative processes and strategic thinking.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A curated portfolio showcasing end-to-end product design projects for web and/or mobile applications.

• Examples demonstrating a clear process for problem identification, user research, ideation, and iterative design.

• Case studies that highlight your role in defining and designing innovative interaction patterns, particularly for complex systems or AI-driven features.

• Visuals of wireframes, user flows, prototypes, and high-fidelity designs, along with explanations of design decisions and trade-offs.

• Evidence of how you've translated user feedback and research findings into design improvements. Process Documentation:

• Showcase how you approach designing for AI-specific challenges, such as managing user trust, providing system transparency, and enabling user control over AI actions.

• Illustrate your workflow for collaborating with cross-functional teams (Product, Engineering, ML) during the design process.

• Demonstrate your methods for rapid prototyping and user testing to validate design concepts and iterate quickly.

• Include examples of how you contribute to or utilize design systems and reusable HCI patterns.

📝 Enhancement Note: For a role focused on AI interaction design, the portfolio should not only showcase visual design and prototyping skills but also the candidate's thought process in tackling novel interaction challenges. Emphasis should be placed on how the candidate approaches the unique problems posed by AI, such as building trust, ensuring transparency, and managing user control. Demonstrating a structured approach to user research and iterative design within a collaborative, fast-paced environment is crucial.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for Product Designers (UX/HCI) with 2-5 years of experience in Seoul, South Korea, a competitive salary range would typically fall between ₩55,000,000 and ₩85,000,000 annually. This estimate considers the cost of living in Seoul, the demand for skilled UX/HCI professionals in the tech sector, and the company's focus on advanced AI products.

Benefits:

• Comprehensive health insurance coverage.

• Paid time off and holidays.

• Opportunities for professional development and continuous learning in AI and UX.

• Stock options or equity participation (potential for high-growth startup).

• Access to cutting-edge AI technologies and tools.

• Collaborative and innovative work environment focused on impactful product development.

• Potential for hybrid work arrangements, offering flexibility.

Working Hours: Standard full-time working hours are typically around 40 hours per week. While the role is hybrid, specific in-office days might be determined by team needs and project cycles, with flexibility often provided for asynchronous work and remote collaboration.

📝 Enhancement Note: Salary ranges are estimates based on publicly available data for similar roles in Seoul, South Korea. Specific compensation will depend on the candidate's experience, qualifications, and the company's internal compensation structure. The benefits are typical for tech roles in major metropolitan areas and are tailored to a startup environment focused on innovation and employee growth.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology, Artificial Intelligence, Software Development, Productivity Tools. Bjak is operating in the rapidly evolving AI-native application space, aiming to disrupt traditional productivity tools by integrating advanced AI capabilities for enhanced user efficiency.

Company Size: Small (typically under 50 employees in early-stage startups). This implies a lean, agile structure where each team member has a significant impact and cross-functional collaboration is essential.

Founded: The founding date is not specified, but the company's mission suggests it is a relatively new or rapidly scaling venture focused on AI innovation.

Team Structure:

• The design team is likely small, consisting of a few highly skilled designers who work closely with Product Managers and Engineers.

• Reporting structures are probably flat, with direct access to leadership and founders.

• Cross-functional collaboration is a cornerstone, with designers deeply integrated into product development cycles, working hand-in-hand with ML engineers and product leads. Methodology:

• Data-driven decision-making, leveraging user research and analytics to inform design choices.

• Rapid iteration and agile development practices to quickly test and deploy new features.

• A strong focus on building reliable, high-quality AI systems that deliver tangible user benefits.

• Emphasis on independent execution and collective decision-making within a high-talent-density team.

Company Website: https://bjak.my/en/about-us

📝 Enhancement Note: The company culture is described as "high talent density and hands-on," emphasizing collective decision-making, rapid speed, and a balance between quality and learning. This suggests an environment where individuals are expected to be proactive, take ownership, and contribute strategically. For a designer, this means being comfortable with ambiguity and actively shaping the product direction.

📈 Career & Growth Analysis

Operations Career Level: This role is classified as a mid-level Product Designer (UX/HCI), specifically focusing on AI-native applications. It requires candidates to have moved beyond entry-level tasks and demonstrate the ability to own significant design challenges, influence product direction, and collaborate effectively with senior technical stakeholders. The "2-5 years" experience level indicates a focus on developing expertise in a specialized area (AI HCI) while also gaining broader product development experience.

Reporting Structure: The designer will likely report to a Head of Design, Design Lead, or a Product Manager, with close day-to-day interaction with Engineering and Machine Learning teams. The reporting structure is expected to be relatively flat, common in early-stage companies, allowing for direct communication and influence.

Operations Impact: The designer's impact is directly tied to the usability, adoption, and perceived intelligence of Bjak's AI products. By creating intuitive interfaces for complex AI systems, the designer will be instrumental in achieving the company's mission of reducing user task completion time and making AI accessible and beneficial to billions globally. Success will be measured by user engagement, task completion rates, and user satisfaction with the AI's performance and controllability.

Growth Opportunities:

• Specialization: Deepen expertise in Human-AI Interaction, becoming a go-to specialist in designing for AI-driven workflows and user trust.

• Leadership: Potential to grow into a Senior Designer or Design Lead role as the company scales, mentoring junior designers and shaping the design strategy.

• Product Strategy: Contribute to defining the product roadmap and user experience vision for new AI-native features and applications.

• Skill Development: Gain hands-on experience with cutting-edge ML models and AI technologies, expanding technical understanding alongside design skills.

• Cross-functional Expertise: Develop a strong understanding of ML engineering and product management principles through close collaboration.

📝 Enhancement Note: The growth opportunities are framed around specialization in a high-demand field (AI HCI), leadership potential in a scaling startup, and a significant impact on product strategy. The role offers a chance to be at the forefront of designing for a new generation of AI applications, providing unique career development potential.

🌐 Work Environment

Office Type: The company offers a hybrid work environment. This typically means a mix of in-office collaboration and remote work, allowing for flexibility while still fostering team connection and in-person brainstorming.

Office Location(s): The primary location is Seoul, South Korea. Specific office details are not provided, but it's likely a modern co-working space or dedicated office in a tech-centric area of the city, designed to facilitate collaboration.

Workspace Context:

• The workspace is designed to support collaboration among small, high-talent teams. Expect an environment that encourages open communication and shared problem-solving.

• Access to modern design tools and technology, including Figma, and potentially advanced ML/AI development environments, will be available.

• Opportunities for frequent interaction with product managers, engineers, and ML specialists, facilitating a deeply integrated design process.

Work Schedule: While a standard 40-hour work week is typical, the hybrid nature and startup environment often allow for flexibility in work hours, accommodating deep work sessions and collaborative meetings effectively. The focus is on outcomes and impact rather than strict adherence to office hours.

📝 Enhancement Note: The hybrid model in Seoul suggests a need for a designer who can manage their time effectively, balance remote focus with in-office collaboration, and contribute to a dynamic team culture. The workspace environment is expected to be conducive to innovation and rapid iteration.

📄 Application & Portfolio Review Process

Interview Process:

• Application Submission: Candidates are required to submit their application, which must include a portfolio.

• Initial Screening: Applications and portfolios are reviewed by team members to assess fit with the role and company.

• Round 1 Interview: Typically a conversation with a hiring manager or senior team member to discuss experience, motivations, and initial design philosophy.

• Design Assessment: Candidates will likely undergo a design exercise or take-home challenge designed to evaluate their problem-solving skills, design process, and ability to create AI-centric user experiences. This may involve analyzing a problem, proposing solutions, and presenting them.

• Round 2 Interview: A more in-depth discussion, potentially with multiple team members (e.g., Product Manager, Lead Engineer, another Designer), focusing on collaboration, critical thinking, and how the candidate would approach specific challenges within Bjak's product.

• Final Evaluation: A prompt decision process based on demonstrated skills, mindset, and cultural fit.

Portfolio Review Tips:

• Curate Selectively: Showcase 2-4 of your strongest projects that best highlight your skills in interaction design, AI HCI, and end-to-end product design.

• Tell a Story: For each project, clearly articulate the problem, your role, the process you followed, your design decisions, and the impact or outcome. Use visuals (wireframes, flows, prototypes) to support your narrative.

• Highlight AI Focus: If possible, include projects that demonstrate experience or thinking around AI, complex systems, or novel interaction patterns. Explicitly discuss how you addressed challenges related to trust, transparency, and control.

• Demonstrate Process: Show your iterative process, including research, ideation, prototyping, and testing. Explain why you made certain design choices.

• Tailor to Bjak: Understand Bjak's mission and product focus. Frame your projects to show how your skills align with their goals of building AI-native productivity tools.

Challenge Preparation:

• Understand AI HCI: Familiarize yourself with common challenges and best practices in designing for AI systems, especially those involving multi-step reasoning and proactive assistance.

• Process Thinking: Be prepared to articulate your design process clearly and concisely, emphasizing how you handle ambiguity and collaborate with technical teams.

• Problem Solving: Practice breaking down complex problems into smaller, manageable parts and proposing user-centered solutions.

• Presentation Skills: Prepare to present your portfolio and any design challenges effectively, clearly communicating your rationale and design decisions.

📝 Enhancement Note: The interview process emphasizes a practical, skills-based evaluation, with a significant focus on the candidate's portfolio and design assessment. The advice for portfolio review and challenge preparation is tailored to highlight the specific requirements of designing for AI interaction.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: The core tool for wireframing, prototyping, and high-fidelity design. Proficiency is essential for rapid iteration and collaboration.

• Prototyping Tools: Beyond Figma's capabilities, familiarity with tools like Principle, ProtoPie, or similar for more advanced interactive prototypes may be beneficial.

• Design System Tools: Experience with tools or methodologies for building and maintaining design systems.

Analytics & Reporting:

• User Analytics Platforms: Familiarity with tools like Amplitude, Mixpanel, or Google Analytics to understand user behavior and inform design decisions.

• Usability Testing Platforms: Experience with tools for remote usability testing and user feedback collection.

CRM & Automation:

• While not directly a designer's primary tool, understanding how user data is managed within CRMs (e.g., Salesforce, HubSpot) and how automation impacts user journeys can be beneficial for context.

• Experience with project management and collaboration tools such as Jira, Asana, or Trello for workflow management.

📝 Enhancement Note: The emphasis on Figma indicates a modern, collaborative design workflow. While specific analytics or automation tools might not be core to the designer's daily tasks, an understanding of how data is used to drive product decisions and how user journeys are automated is advantageous for holistic product design.

👥 Team Culture & Values

Operations Values:

• Innovation: A drive to explore new frontiers in AI and user experience, creating truly novel products.

• User-Centricity: A commitment to understanding user needs deeply and designing solutions that provide genuine value and efficiency.

• Excellence: Striving for high quality in both technical implementation and user experience design, aiming for reliable and magical products.

• Collaboration: A belief that the best outcomes are achieved through close teamwork and open communication across disciplines.

• Agility: Embracing rapid iteration, learning, and adaptation in a fast-paced startup environment.

Collaboration Style:

• Cross-functional Integration: Designers are expected to be deeply embedded within product and engineering teams, participating in problem definition and solution ideation from the outset.

• Open Feedback Culture: Encouraging constructive feedback and open dialogue to collectively improve designs and product direction.

• Knowledge Sharing: A culture where team members share insights, learnings, and best practices, particularly around AI HCI and design methodologies.

📝 Enhancement Note: The company values align with a fast-paced, innovative startup environment. For a designer, this means being proactive, collaborative, and focused on delivering high-impact user experiences. The emphasis on "truly magical product" and "practical benefits to billions globally" suggests a culture driven by ambitious goals and a desire to create significant positive change.

⚡ Challenges & Growth Opportunities

Challenges:

• Designing for Ambiguity: The inherent uncertainty in AI development requires designers to be comfortable creating solutions without fully defined requirements, relying on user research and iterative hypothesis testing.

• Building User Trust: AI systems can be opaque. A key challenge is designing interfaces that build and maintain user trust through transparency, control, and reliable performance.

• Simplifying Complexity: Translating complex AI reasoning and multi-step processes into simple, intuitive user experiences requires significant skill and creative problem-solving.

• Rapidly Evolving AI Landscape: Keeping pace with advancements in AI technology and understanding how to leverage them effectively in product design is an ongoing challenge.

Learning & Development Opportunities:

• AI HCI Specialization: Opportunities to become a leading expert in a niche but rapidly growing field.

• Cross-Disciplinary Learning: Deep exposure to Machine Learning concepts, product strategy, and agile development methodologies.

• Impactful Product Development: The chance to work on a product with the potential for global reach and significant positive impact on daily user tasks.

• Startup Growth: Experience the dynamic environment of a scaling startup, which often provides accelerated career progression and broader responsibilities.

📝 Enhancement Note: The challenges are directly related to the nature of working with advanced AI, requiring adaptability and a strong problem-solving mindset. The growth opportunities highlight the unique value proposition of working in this specific domain and company stage.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you had to design for a complex system with unclear requirements. How did you approach it, and what was the outcome?" (Assesses ability to handle ambiguity and proactive problem-solving).

• "How would you design an interface to help users understand and trust an AI that performs multi-step tasks?" (Tests understanding of AI HCI principles and trust-building strategies).

• "Walk us through a project where you collaborated closely with engineering and product teams. What was your role, and how did you ensure alignment?" (Evaluates collaboration and cross-functional communication skills). Company & Culture Questions:

• "What excites you about Bjak's mission to build AI-native productivity tools?" (Assesses alignment with company vision and passion for the domain).

• "How do you balance user needs with technical constraints and business goals in your design process?" (Explores design philosophy and pragmatic decision-making).

• "Describe your experience with iterative design and user feedback. How do you incorporate it into your work?" (Probes approach to continuous improvement and user-centricity). Portfolio Presentation Strategy:

• Narrative Arc: Structure your portfolio presentation with a clear beginning (problem), middle (process & solutions), and end (impact & learnings).

• Focus on 'Why': For each design decision, explain the reasoning behind it, referencing user research, heuristics, or strategic goals.

• Show, Don't Just Tell: Use visuals effectively to illustrate your concepts, flows, and prototypes. Be ready to demonstrate interactive prototypes if applicable.

• Quantify Impact: Where possible, use data or user feedback to demonstrate the success of your designs, especially in terms of usability, efficiency, or user satisfaction.

• Address AI Specifically: If presenting AI-related projects, explicitly discuss how you handled issues of trust, control, and transparency.

📝 Enhancement Note: Interview questions are designed to probe the candidate's ability to handle the unique challenges of AI product design, their collaborative skills, and their understanding of Bjak's mission. Portfolio presentation advice emphasizes storytelling, strategic justification, and demonstrating impact, especially in the context of AI.

📌 Application Steps

To apply for this Product Designer (UX), HCI position:

• Submit your application through the provided link on Ashby.

• Portfolio Customization: Carefully select and refine your portfolio to showcase 2-4 relevant projects that best demonstrate your skills in interaction design, AI HCI, and end-to-end product development. Ensure each project clearly outlines the problem, your role, process, solutions, and outcomes.

• Resume Optimization: Tailor your resume to highlight experience with Figma, interaction design, user research, and any relevant work on complex systems or AI products. Use action verbs and quantify achievements where possible.

• Interview Preparation: Practice articulating your design process, your approach to handling ambiguity, and how you build user trust in AI systems. Prepare specific examples from your portfolio to answer potential strategy and behavioral questions.

• Company Research: Thoroughly research Bjak's mission, product, and the broader AI-native application market. Understand their goals for making AI accessible and beneficial, and be ready to discuss how your design philosophy aligns with their vision.

⚠️ 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.