The Situation

Peer-to-peer marketplaces unlock access and liquidity for high-value goods, but they also introduce systemic risk. Unlike traditional e-commerce, where trust is centralized in the platform, P2P transactions distribute trust across individual participants—creating uncertainty around seller credibility, product authenticity, and payment security.

MarketSquare set out to solve a critical behavioral problem: users were reaching high-intent moments—onboarding completion, listing activation, and payment—but hesitating or abandoning due to lack of confidence. Early signals showed that trust was not failing at a single step; it was eroding cumulatively across the experience. This resulted in stalled transactions, reduced marketplace liquidity, and increased fraud-related concerns.

The opportunity was not simply to reduce friction, but to redefine how trust is communicated throughout the product lifecycle.

My Role

I led the end-to-end UX effort over an eight-week engagement, owning the experience from discovery through delivery. My scope spanned research synthesis, interaction design, system definition, prototyping, and usability validation across both mobile and web platforms.

I worked cross-functionally with product managers and engineers to translate abstract marketplace risks into concrete, scalable design decisions. This included aligning on experience principles, defining trust signals, and ensuring that design solutions could be implemented within technical and timeline constraints.

Results

A/B testing against the legacy experience demonstrated measurable improvements across both behavioral and perception metrics:

• Onboarding completion increased by 26%

• Transaction drop-off decreased by 17%

• Task success rates improved to 32%

• User trust perception scores increased by 100%

• Listing activation increased by 79%

Post-launch analysis also showed an 18% reduction in fraud-related support requests, indicating that improvements extended beyond usability into real-world risk mitigation.

Discovery

Understanding the Problem

Through competitive analysis, journey mapping, and usability evaluation, a clear behavioral pattern emerged: users were willing to tolerate additional steps when those steps increased their confidence, but abandoned flows quickly when uncertainty appeared without explanation.

This insight fundamentally reframed the problem. Speed and efficiency—typically primary optimization goals—were not the limiting factors. Instead, the absence of clarity and reassurance created friction that outweighed any gains from streamlined interactions.

Trust, therefore, was not a feature to be added. It was a system-level experience requirement that needed to be embedded across the entire user journey.

Define

The Challenge

Designing for a two-sided marketplace introduces inherent tension. Reducing friction for sellers can increase risk for buyers, while introducing safeguards for buyers can reduce seller participation and slow marketplace activity.

The core challenge became operationalizing trust as a measurable product problem. Existing verification signals were inconsistent, listing expectations were unclear, and payment flows introduced anxiety at the most critical decision points.

The team aligned around a key principle: trust must be communicated continuously, not episodically. Rather than relying on isolated safety features, the product needed to provide persistent signals of credibility, transparency, and control throughout the entire transaction lifecycle.

Understanding and Analyzing

Before moving into design, I conducted a comprehensive review of both historical and current research to ground decisions in evidence. This included synthesizing internal documentation, customer experience insights, and prior usability findings.

This analysis reinforced that trust breakdowns were not isolated incidents but systemic gaps across onboarding, listing creation, discovery, and payment. Addressing these gaps required a cohesive approach rather than incremental fixes.

Market Research

External research further validated the scale of the problem. In 2020, users lost approximately $3.3 billion to fraud across peer-to-peer marketplaces. Projections indicate that this figure could grow to $33 billion by 2025, highlighting both the urgency and the business impact of trust failures.

Competitive Landscape

Analysis of leading platforms—including eBay, Etsy, Facebook Marketplace, and Amazon—revealed a reliance on third-party payment systems and relatively limited use of emerging technologies such as AI to proactively enhance trust and usability.

While these platforms provide baseline protections, they often fail to deliver consistent, real-time reassurance throughout the user journey.

Users

To better understand user pain points, I partnered with customer experience and documentation teams to gather qualitative insights. These findings informed the creation of journey maps, empathy maps, and personas representing both buyers and sellers.

This dual-sided perspective was critical in identifying conflicting needs and ensuring that solutions supported overall marketplace health rather than optimizing for a single user group.

Design Audit

A comprehensive audit of the existing product identified key usability and structural issues that contributed to trust breakdown:

• Sellers could not edit listings after creation, limiting flexibility and accuracy

• Filtering capabilities were insufficient, reducing discovery confidence

• UI components such as buttons and input fields lacked consistency

• Information architecture was fragmented and difficult to navigate

• Core user flows contained unnecessary complexity and friction

These findings provided a clear baseline for improvement and informed prioritization for the V1 redesign.

To expand solution space, I facilitated a collaborative brainstorming session that encouraged divergent thinking without feasibility constraints, enabling the team to explore high-impact ideas before converging on practical implementations.

Ideate

Designing Trust as a System

The ideation phase focused on embedding trust across the full marketplace experience rather than treating it as an isolated layer. Exploration centered on:

• Progressive onboarding to gradually build confidence

• Early and persistent visibility of verification signals

• Transparent pricing and fee communication

• Reassurance patterns during high-risk interactions

• Strategic integration of AI to reduce ambiguity

These explorations led to a set of guiding principles: prioritize visibility, maintain transparency, and introduce intentional friction where it increases user confidence.

Key Product Questions

Two core questions guided solution development:

• How might we reduce scams while increasing meaningful engagement between buyers and sellers?

• How might AI be integrated in a way that enhances clarity without introducing new uncertainty?

Concept Exploration

Several concepts were explored to address these questions:

• AI-assisted listing creation, including automated descriptions and category tagging

• A “pay-to-talk” feature to enable more intentional buyer-seller communication

• A wallet system to centralize and secure transactions

MVP Definition

To ensure focus and feasibility within timeline constraints, the MVP prioritized foundational marketplace functionality:

• Listing creation and management

• Direct messaging between users

User Flow

To operationalize these concepts, I developed a comprehensive end-to-end user flow that mapped user intent, system responses, and potential edge cases.

This exercise surfaced complexity early, enabling cross-functional alignment on interaction logic before investing in high-fidelity design. It also ensured that trust signals were consistently integrated across all stages of the experience.

Design

System Design and Prototyping

Using research insights and defined principles, I developed a scalable design system alongside wireframes and high-fidelity prototypes in both light and dark modes.

The system emphasized consistency, clarity, and accessibility while supporting the nuanced needs of both buyers and sellers.

Accessibility and Brand Identity

Design decisions were guided by WCAG accessibility standards and a clearly defined brand identity. The visual language was intentionally aligned with themes of:

• Sophistication and high value

• Luxury and trustworthiness

• Clean, minimal elegance

These attributes reinforced the platform’s positioning as a safe environment for high-value transactions.

Key Experience Touchpoints

The redesigned experience addressed all major interaction points, including:

• Sign up and authentication

• Onboarding flows

• Search and discovery

• Home experience

• Product detail views for buyers

• Listing creation for sellers

• Wallet and transaction flows

Each touchpoint was designed to reinforce trust through clarity, feedback, and consistency.

Tradeoffs

Given time and engineering constraints, strategic tradeoffs were necessary. The team prioritized foundational trust and marketplace stability over feature expansion.

Advanced capabilities such as personalization and seller analytics were intentionally deferred to focus on strengthening core transaction confidence.

In several cases, friction was deliberately introduced—particularly in high-risk interactions—to prioritize certainty over speed. This decision reflected the core insight that users value reassurance more than efficiency in high-value transactions.

Results

What Changed

The redesigned experience systematically addressed trust gaps across the user journey, resulting in measurable improvements in both behavior and perception.

Outcomes

A/B testing with 19 existing users revealed significant gains:

• Onboarding completion increased by 26%

• Transaction drop-off decreased by 17%

• Task success rates improved to 32%

• User trust perception scores increased by 100%

• Listing activation increased by 79%

Follow-up analysis showed an 18% reduction in fraud-related support requests, indicating real-world impact beyond usability metrics.

Business Impact

Improved trust translated directly into increased user engagement and retention. As confidence in the platform grew, users were more willing to complete transactions and participate ակտիվly in the marketplace.

Beyond immediate metrics, the project established a scalable trust framework that can support future growth and feature expansion.

Takeaways

Reflection

This project reinforced that in two-sided marketplaces, trust is not a supporting feature—it is the core product experience. Designing for high-value transactions requires balancing usability with confidence, ensuring that users feel informed, protected, and in control at every step.

Empathy played a central role in this process. While business metrics and growth are critical, long-term success depends on building systems that genuinely address user concerns and reduce perceived risk.

What I Learned

Grounding decisions in data—both quantitative and qualitative—was essential in navigating competing priorities. Synthesizing past research alongside new insights enabled stronger alignment with stakeholders while maintaining a user-centered perspective.

Balancing business goals with user needs was challenging at times, but ultimately led to more resilient and effective design outcomes.

What I Would Do Next

Future iterations should continue strengthening security and flexibility within the platform. Key opportunities include:

• Introducing multi-factor authentication for wallet interactions

• Expanding supported payment methods

• Iterating on communication and verification systems

Continued investment in these areas would further enhance trust and support long-term marketplace scalability.