Bala Ramdoss on Generative UI for Agentic CX

In the rapidly evolving world of AI-powered features, getting a model to produce the correct output is only half the battle. The other, often more challenging, half is translating that output into a seamless and usable product experience for the end-user. Bala Ramdoss, a Tech Lead at Amazon known for his work on AI features like Amazon Lens, recently shared insights on this crucial aspect in a talk titled "Agent Output Is Not UX: Rendering Layer Your LLM Pipeline Is Missing." He highlighted the common pitfalls teams encounter when building agentic customer experiences (CX) and offered solutions rooted in practical engineering principles.

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The Generative UI Frontier

Ramdoss began by identifying a recurring challenge in the industry: impressive AI feature demos that falter in production due to poor user experience. He pointed to issues like broken latency, the interface's inability to handle unexpected model output types, and the general difficulty in making AI feel natural and responsive. These, he emphasized, are not model-centric problems but rather engineering challenges residing in what is now being termed generative UI.

Generative UI, in this context, refers to the layer responsible for rendering the output of large language models (LLMs) into a user-friendly interface. It's the bridge between raw model data and a tangible user interaction.

Key Patterns for Effective Generative UI

Ramdoss outlined three core patterns that are essential for building robust and user-centric generative AI features:

• The Rendering Contract: This involves establishing a typed, versioned agreement between the model's output and the UI components. A key aspect is a deliberate fallback mechanism for unknown content types. This ensures that if a model generates something new, the UI can degrade gracefully instead of breaking entirely, especially critical for client-side applications that cannot be easily hot-fixed.
• Streaming into Structured UI: Instead of waiting for a complete response, models can progressively render their output into typed components. This allows the interface to assemble and display information as it arrives, improving perceived performance and user engagement. Examples include assembling product cards or follow-up prompts incrementally.
• BFF Patterns for AI Features: Implementing a Backend-for-Frontend (BFF) layer is crucial for absorbing the inherent unpredictability of models. This layer can manage conversational context across turns, abstracting model complexities away from the client and ensuring a more consistent user experience.

Mobile Adds Complexity

The presentation also touched upon the unique challenges of implementing these patterns in mobile applications. Unlike web deployments where fixes can be pushed live within minutes, mobile updates involve a longer cycle of building, review, and staged rollouts, often spanning days or weeks. This difference in deployment speed means that any issues in the AI rendering layer can have a prolonged impact on a significant user base. Ramdoss illustrated this by contrasting the immediate deployment of web fixes with the phased approach for mobile, where users control their own timeline of receiving updates. This highlights the importance of getting the client-side rendering right from the start.

The Rendering Layer as a Product Decision

Ramdoss stressed that latency is not just a technical metric but a product decision. When beating latency is not feasible, designing around it becomes paramount. This involves providing users with visual cues and clear feedback about what the AI is doing, such as loading indicators or partial renderings, to manage expectations and maintain engagement. The goal is to ensure that users feel informed and in control, even when the underlying processes take time.

From Data APIs to UI-Shaping APIs

The talk also categorized approaches to generative UI into three spectrums:

• Controlled: The model picks a pre-built component (e.g., a product card).
• Declarative: The model composes UI from a catalog of components, such as with A2UI (Action to UI), which is an open standard developed by Google for streaming UI components.
• Open-ended: The model generates novel UI on the fly, as seen with MCP Apps.

Traditional data APIs return data that the client then renders. In contrast, UI-shaping APIs enable the model to dictate not just the data but also how it should be presented, offering greater control and a more integrated user experience.

The Role of BFF and Context

Ramdoss elaborated on how the BFF layer can be instrumental in this process. By handling tasks like formatting, context management, hydration, and actions, the BFF can effectively shield the client from the complexities of model interactions. This allows the client to remain simpler, or 'dumb,' making development and maintenance more manageable. The BFF can also manage platform-specific CX, ensuring that the user experience is optimized for different devices and operating systems. Crucially, the BFF can maintain conversational context across turns, providing a more coherent and natural interaction for the user.

Ultimately, Ramdoss's presentation underscored that the success of AI-powered features hinges not only on the intelligence of the models but also on the engineering discipline applied to the rendering layer. By focusing on generative UI, streaming, and robust BFF patterns, teams can bridge the gap between model output and exceptional user experiences, even at massive scale.