Senior Product Designer

📍 Job Overview

Job Title: Senior Product Designer

Company: Harmonic Security

Location: London, England, United Kingdom

Job Type: FULL_TIME

Category: Product Design / UX/UI

Date Posted: 2026-02-27

Experience Level: Mid-Senior Level (5-10 years)

Remote Status: Hybrid

🚀 Role Summary

• This Senior Product Designer role emphasizes Information Architecture and Systems Thinking to translate complex AI-first data protection and cybersecurity technology into an intuitive, self-serve user experience.

• The position requires a logic-first thinker who can map system states and complex data logic, ensuring product usability despite technical sophistication.

• A core responsibility is the stewardship and standardization of the design system to eliminate "Dev Drift" and enhance engineering velocity.

• The role focuses on optimizing cognitive load and acting as a bridge between the product's power and the user's mental model, directly supporting Product-Led Growth initiatives.

• Strategic handoff to engineering is critical, involving high-fidelity specifications that define edge cases and error states upfront.

📝 Enhancement Note: While titled "Senior Product Designer," the description heavily emphasizes UX, Information Architecture, and Systems Thinking, positioning it as a highly specialized role focused on the "Technical UX" of a complex cybersecurity product. This suggests a need for candidates with a strong analytical and logical approach to design, rather than purely visual or interaction design. The "AI-First" nature of the company also implies a forward-thinking approach to technology and potentially data-intensive user interfaces.

📈 Primary Responsibilities

• Systems Architecture & Technical UX: Collaborate closely with the Product Team to translate high-stakes complexity into frictionless user workflows, mapping out system states and complex data logic to ensure product intuitiveness.

• Signal Integrity & Research Standardisation: Conduct unprimed user testing, both solo and with the team, to ensure the product roadmap is driven by raw evidence and user "Signal."

• UI Baseline and Stewardship: Drive the standardization and consistency of the design system to eliminate "Dev Drift," maximize engineering velocity, and ensure a high-fidelity, reusable design foundation.

• Cognitive Load Optimisation: Act as a bridge between the product's power and the user's mental model, simplifying "technical UX" to make the product self-serve and support Product-Led Growth.

• Strategic Handoff & Logic Mapping: Provide Engineering with high-fidelity specifications that extend beyond static mocks, defining the logic for edge cases and error states to minimize mid-sprint pivots and rework.

📝 Enhancement Note: The responsibilities highlight a blend of strategic design thinking, user research, design system management, and detailed technical specification. This indicates a role that requires not only creative design skills but also strong analytical capabilities and a deep understanding of software development processes. The emphasis on "unprimed user testing" and "raw evidence" points to a data-driven approach to design decisions.

🎓 Skills & Qualifications

Education: Not specified, but a Bachelor's or Master's degree in Design, HCI, Computer Science, or a related field is typically expected for senior roles in this domain.

Experience: Minimum of 7 years of experience in UX and/or Product Design, with a demonstrable track record in complex, high-cognitive load B2B/Enterprise/SaaS environments.

Required Skills:

• Deep understanding of user experience principles, best practices, and usability heuristics.

• Proven ability to design and deliver exceptional user experiences, supported by a strong portfolio showcasing successful projects.

• Ability to distill complex user needs into simple, intuitive solutions that align with business objectives.

• Experience in B2B/Enterprise/SaaS product design, particularly within "High-Cognitive Load" domains such as Cybersecurity, Fintech, DevOps tools, or Cloud Infrastructure.

• Excellent communication, presentation, and cross-functional collaboration skills.

Preferred Skills:

• Systems/Library Ownership or Contribution experience.

• Experience with AI-driven products or data detection engines.

• Familiarity with state-machine design principles and implementation.

• Experience in Product-Led Growth (PLG) strategies and execution.

📝 Enhancement Note: The requirements strongly emphasize experience with complex B2B/SaaS products, particularly in domains like cybersecurity, which are characterized by high cognitive load. The preference for systems/library ownership suggests a candidate who can not only design but also contribute to and maintain the underlying structure of design components and systems. The explicit mention of Figma indicates a primary tool requirement.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase a minimum of 7 years of UX/Product Design work, with a focus on complex B2B/Enterprise/SaaS products, especially in high-cognitive load domains (e.g., Cybersecurity, Fintech, DevOps).

• Demonstrate a strong understanding of Information Architecture and Systems Thinking, illustrating how complex logic was translated into intuitive user workflows.

• Include case studies that highlight the ability to distill complex user needs into simple, intuitive solutions that meet business objectives.

• Present examples of design system standardization, "Dev Drift" elimination, and the creation of high-fidelity specifications for engineering, including edge cases and error states.

Process Documentation:

• Case studies should detail the user research process, including methodologies for "unprimed user testing" and how "raw evidence" influenced roadmap decisions.

• Illustrate the process of defining and mapping system states and complex data logic for technical UX.

• Provide examples of strategic handoffs to engineering, detailing the scope and fidelity of specifications provided.

• Showcase contributions to or ownership of design systems, demonstrating an understanding of consistency, reusability, and engineering velocity.

📝 Enhancement Note: The portfolio requirements are highly specific, demanding evidence of experience in complex B2B/SaaS environments and a demonstrated ability to manage technical complexity through design. Candidates must be prepared to showcase their process for translating intricate systems into user-friendly interfaces and effectively communicating these designs to engineering teams. The emphasis on "Systems Thinking" and "Information Architecture" suggests a need for a structured approach to design problem-solving.

💵 Compensation & Benefits

Salary Range: For a Senior Product Designer with 7+ years of experience in London, a competitive salary range is estimated between £75,000 - £110,000 per annum. This estimate is based on industry benchmarks for senior design roles in the UK tech sector, considering the company's focus on AI, cybersecurity, and its startup/growth stage. Factors like equity, benefits, and specific company funding also influence individual compensation.

Benefits:

• Competitive pay and meaningful equity, providing a direct stake in Harmonic's success.

• Comprehensive benefits package.

• Pension plan.

• Generous Paid Time Off (PTO).

• Flexible hybrid work arrangement.

Working Hours: The standard working hours are likely around 40 hours per week, with flexibility offered through the hybrid work model.

📝 Enhancement Note: The salary estimate is based on general market data for senior product design roles in London, a major tech hub. The inclusion of "meaningful equity" is a significant component for startup environments and should be a key consideration for candidates. The "flexible hybrid work" model offers a balance between in-office collaboration and remote work.

🎯 Team & Company Context

🏢 Company Culture

Industry: Cybersecurity / Data Protection / AI-First Technology. Harmonic Security operates at the intersection of cutting-edge AI technology and critical data security, a rapidly evolving and high-demand sector.

Company Size: Harmonic Security is likely a growing startup or early-stage company, indicated by the emphasis on building culture, offering meaningful equity, and the "small, passionate team" description. This environment often offers significant impact and faster decision-making.

Founded: The founding date is not specified, but the company's focus on AI and its current growth phase suggest it is a relatively modern venture.

Team Structure:

• The Product Design team likely works closely with Product Management and Engineering.

• Senior designers are expected to operate with a high degree of autonomy, partnering directly with product leadership.

Methodology:

• Data-Driven Design: Emphasis on "raw evidence" and "Signal" from user testing to inform product decisions.

• Systems Thinking: A core approach to understanding and designing complex systems.

• Process Optimization: Focus on standardizing design systems and streamlining handoffs to improve engineering velocity.

• Product-Led Growth (PLG): Designing for self-serve experiences that drive user adoption and growth.

Company Website: https://harmonic.security/

📝 Enhancement Note: The company culture appears to be entrepreneurial, valuing initiative, learning, and collaboration. The "AI-First" and "Cybersecurity" focus suggests a technically sophisticated and innovative environment. The "small, passionate team" aspect implies a close-knit group where individual contributions are highly visible and impactful.

📈 Career & Growth Analysis

Operations Career Level: This is a "Senior" level role, indicating a need for seasoned professionals who can operate independently, mentor others, and influence product strategy. It sits above mid-level designers and below lead or principal roles, with significant responsibility for key product areas.

Reporting Structure: While not explicitly stated, a Senior Product Designer typically reports to a Head of Product, Design Lead, or equivalent manager. They are expected to work closely with Product Managers and Engineering Leads.

Operations Impact: The role has a direct impact on the product's usability and adoption, particularly through the Product-Led Growth strategy. By making complex cybersecurity technology intuitive and self-serve, this designer will directly influence customer acquisition, retention, and overall revenue.

Growth Opportunities:

• Specialization: Deepen expertise in Information Architecture, Systems Thinking, and Technical UX within the cybersecurity domain.

• Leadership: Potential to grow into a Lead Product Designer role, managing a team or overseeing larger product initiatives.

• Cross-functional Influence: Gain experience influencing product strategy and development processes across departments.

• Industry Expertise: Become a subject matter expert in designing for complex AI-driven security products.

• Cultural Impact: Contribute to shaping the design and engineering culture of a growing company.

📝 Enhancement Note: This role offers significant growth potential, particularly for individuals looking to specialize in the challenging domain of cybersecurity UX and contribute to a product's foundational design. The emphasis on PLG and self-serve experiences aligns with current industry trends, providing valuable experience.

🌐 Work Environment

Office Type: The role is designated as "Hybrid," indicating a mix of remote work and in-office presence. This suggests a collaborative office environment designed to foster teamwork and innovation, balanced with the flexibility of remote work.

Office Location(s): London, England, United Kingdom. The specific office location within London is not detailed but would be the primary hub for in-office collaboration.

Workspace Context:

• Collaborative Environment: The hybrid model implies opportunities for in-person brainstorming, design critiques, and team building.

• Technology Access: Likely equipped with modern design tools and infrastructure to support both remote and in-office work.

• Team Interaction: Opportunities to engage directly with product managers, engineers, and other designers for a cohesive product development process.

Work Schedule: Standard full-time hours (likely 40 hours/week), with flexibility afforded by the hybrid arrangement. This allows for structured workdays while accommodating personal needs.

📝 Enhancement Note: The hybrid nature of the role suggests a modern work environment that balances the benefits of in-person collaboration with the flexibility of remote work, a common model for tech companies in major hubs like London.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Review of resume and portfolio to assess experience, skills, and alignment with the role's unique requirements (Systems Thinking, Technical UX).

• Portfolio Presentation & Deep Dive: Candidates will likely present selected case studies, focusing on how they approached complex problems, their design process, and the impact of their work. Expect detailed questions on Information Architecture, state-machine design, and user research methodologies.

• Technical/Design Challenge: A practical exercise may be given to assess problem-solving skills, design thinking, and ability to translate complex logic into user-friendly interfaces. This could involve analyzing a system, proposing a workflow, or designing a specific feature.

• Cross-functional Interviews: Meetings with Product Management and Engineering leads to assess collaboration style, communication skills, and understanding of the development lifecycle.

• Cultural Fit Interview: Discussion with team members or leadership to evaluate alignment with Harmonic's core values (Flourish in the Unknown, Never Full, Perfect Harmony).

Portfolio Review Tips:

• Highlight Systems Thinking: Explicitly showcase projects where you mapped complex systems, defined states, and managed intricate logic. Use diagrams or flowcharts to illustrate your thought process.

• Focus on "Technical UX": Provide examples where you simplified complex technical concepts for users, reduced cognitive load, and facilitated self-serve experiences.

• Demonstrate Impact: Quantify the results of your work whenever possible, using metrics related to user adoption, task completion rates, reduction in support tickets, or contribution to Product-Led Growth.

• Showcase Design System Contributions: If applicable, detail your role in developing, standardizing, or contributing to design systems, emphasizing how you eliminated "Dev Drift" and improved engineering efficiency.

• Detail Research & Handoff: Clearly explain your user research process, especially any "unprimed" or evidence-based methods, and illustrate the detail and scope of your technical specifications for engineering.

Challenge Preparation:

• Understand the Domain: Research cybersecurity, AI-driven detection engines, and common challenges in enterprise SaaS.

• Practice Systems Mapping: Be prepared to diagram complex workflows, state transitions, and data flows.

• Articulate Trade-offs: Be ready to discuss design decisions, trade-offs, and how you balanced user needs with technical constraints and business goals.

• Communicate Value: Practice articulating how your design solutions directly support business objectives, such as Product-Led Growth and engineering velocity.

📝 Enhancement Note: The interview process and portfolio review for this role will likely be rigorous, emphasizing analytical and systems-oriented design skills over purely aesthetic ones. Candidates must be prepared to demonstrate a deep understanding of how to translate complex technical concepts into accessible and intuitive user experiences.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: Explicitly mentioned as a required proficiency for UI/UX design, prototyping, and potentially design system management.

• Information Architecture Tools: While not specified, tools like Miro, Lucidchart, Whimsical, or specialized IA software may be used for mapping system states, user flows, and complex logic.

• Prototyping Tools: Figma's built-in prototyping features are likely primary, but other tools might be leveraged depending on the complexity of interactive prototypes.

Analytics & Reporting:

• Product Analytics Platforms: Tools like Amplitude, Mixpanel, or Pendo are commonly used in SaaS/PLG environments to track user behavior, feature adoption, and identify areas for UX improvement.

• User Testing Platforms: Tools for remote unmoderated or moderated user testing (e.g., UserTesting.com, Lookback) are likely employed.

CRM & Automation:

• CRM Systems: Salesforce or HubSpot might be relevant for understanding customer journeys and sales processes, though less directly used by the design team.

• Project Management & Collaboration Tools: Jira, Asana, Trello, or similar tools for managing design tasks, sprints, and cross-functional collaboration.

• Design System Management Tools: Tools or processes for managing design tokens, component libraries, and documentation, often integrated within Figma or using separate platforms.

📝 Enhancement Note: Proficiency in Figma is a non-negotiable requirement. The role also implies a need for familiarity with tools that support complex system mapping, user research, and product analytics, essential for a data-driven and PLG-focused approach.

👥 Team Culture & Values

Operations Values:

• Flourish in the Unknown: Embrace ambiguity, take initiative, and make rapid, informed decisions in new situations. Demonstrate a proactive and self-sufficient approach to problem-solving.

• Never Full: Actively seek out challenges, demonstrate a hunger for learning, and be willing to go above and beyond to support team goals and assist colleagues.

• Perfect Harmony: Foster cohesion and unity through genuine willingness to assist and support others. Engage in honest feedback, collaboration, and knowledge sharing to drive collective growth and high-quality output.

Collaboration Style:

• Cross-functional Integration: Work seamlessly with Product Management and Engineering, acting as a bridge between technical complexity and user needs.

• Feedback-Driven: Actively participate in design critiques and provide/receive constructive feedback to refine designs and processes.

• Knowledge Sharing: Contribute to a culture of learning by sharing insights from user research, design system best practices, and innovative problem-solving techniques.

📝 Enhancement Note: Harmonic Security's core values emphasize proactivity, continuous learning, and strong teamwork. Candidates should demonstrate these traits, showing a willingness to tackle challenges, support colleagues, and contribute to a positive, collaborative environment.

⚡ Challenges & Growth Opportunities

Challenges:

• Translating Extreme Complexity: The primary challenge will be simplifying highly technical, AI-driven cybersecurity concepts into an intuitive, self-serve experience.

• Balancing "Dev Drift" and Design System Evolution: Maintaining design consistency while allowing for necessary product evolution and engineering innovation.

• Validating "Signal" in User Research: Conducting effective user research that extracts genuine insights ("Signal") from users who may have limited understanding of the underlying technology.

• Driving Adoption in a Niche Market: Influencing Product-Led Growth for a sophisticated enterprise cybersecurity product.

Learning & Development Opportunities:

• Deep Domain Expertise: Gain profound knowledge in cybersecurity UX and AI-driven product design.

• Systems Design Mastery: Hone skills in Information Architecture and complex system design for enterprise software.

• Product Strategy Influence: Contribute significantly to the product roadmap and PLG strategy.

• Startup Growth Experience: Be part of a company scaling rapidly, offering exposure to various aspects of business growth.

📝 Enhancement Note: This role presents a unique opportunity to solve challenging design problems in a critical and rapidly evolving industry. The emphasis on growth and learning within a dynamic startup environment is a significant draw for ambitious designers.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you had to translate a highly complex technical system into a simple, intuitive user experience. What was your process, and what were the outcomes?" (Focus on Systems Thinking, Information Architecture, Technical UX)

• "How do you approach 'unprimed' user testing, and how do you ensure you're gathering genuine 'Signal' rather than user assumptions?" (Focus on Research Methodology, Bias Mitigation)

• "Imagine our data detection engine has several complex state transitions. How would you visually represent these states and their implications to a user with limited technical background?" (Focus on State-Machine Design, Cognitive Load)

Company & Culture Questions:

• "Harmonic's value is 'Flourish in the Unknown.' Can you share an example of a time you successfully navigated a highly ambiguous or unfamiliar situation in a previous role?"

• "How do you embody the 'Never Full' principle in your work and career development?"

Portfolio Presentation Strategy:

• Structure for Systems: For each case study, clearly outline the problem, your approach (emphasizing IA and Systems Thinking), the solution, and the measurable impact. Use diagrams extensively.

• Quantify Impact: Be prepared to discuss metrics related to user adoption, efficiency gains, or reduction in user errors. If direct metrics aren't available, discuss how your design intended to impact these areas.

• Showcase Technical Handoff: Present examples of your detailed specifications for engineering, highlighting how you addressed edge cases and error states.

• Narrate Your Process: Walk interviewers through your decision-making process, explaining the 'why' behind your design choices, especially in relation to simplifying complexity.

📝 Enhancement Note: Interview preparation should focus on demonstrating analytical rigor, a deep understanding of complex systems, and a proven ability to translate technical intricacies into user-friendly experiences. Be ready to discuss your design process in detail, supported by concrete examples from your portfolio.

📌 Application Steps

To apply for this Senior Product Designer position:

• Submit your application through the provided link on Workable.

• Portfolio Customization: Tailor your portfolio to highlight 2-3 key projects that best demonstrate your experience in Information Architecture, Systems Thinking, and designing for complex B2B/SaaS/Cybersecurity products. Emphasize projects where you simplified technical complexity and contributed to self-serve experiences.

• Resume Optimization: Ensure your resume clearly details your 7+ years of experience, specifically mentioning "Information Architecture," "Systems Thinking," "Technical UX," "Design Systems," and experience with "high-cognitive load" products like Cybersecurity or Fintech. Quantify achievements where possible.

• Interview Preparation: Practice articulating your design process and the impact of your work, using the STAR method. Be ready to discuss Harmonic's core values and how you embody them. Prepare specific examples for potential interview questions related to complex problem-solving and collaboration.

• Company Research: Thoroughly research Harmonic Security, its product, and its mission in the cybersecurity space. Understand their "AI-First" approach and their commitment to Product-Led Growth.

⚠️ 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.

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