Reducing registration errors in a sales-critical flow

Lemon Energia is a Series-A climate-tech startup that connects small and medium businesses to clean energy through distributed solar generation.

THE PROBLEM

Registration data mismatch and contract rework

OVERVIEW

Lemon's registration flow requires users to:

  1. Fill out the form

  2. Verify their IDs

  3. Send the real estate's electricity bill

  4. Sign the contract

A slow, confusing, and prone to errors form, averaging 23 minutes to completion.

Within this flow, new leads were providing the wrong data, which required a full contract re-sign — a costly loop that delays conversion and extends time-to-value.

segmentation

Identifying the type of lead to contextualize the user

spacer

Initially, the registration flow:

  • Asked all users the same questions

  • Did not consider the person filling out the form

  • Confused users with jargons

Thinking about the personas who were registering at Lemon, I added a step to identify the type of lead before they were prompted for any specific data.

UX STRATEGY

In-product research to better understand Lemon's users

spacer

The registration form was lengthy and felt too transactional.

  • ~72% of leads lost were due to disengagement

I added a step to understand users' motivation for clean energy to build rapport and enable personalized approaches. A multiple-choice question that takes seconds to answer and gives qualitative insights about the users.

SALES REQUIREMENTS

Balancing UX and Sales strategy

spacer

To reduce confusion, I redesigned the flow to ask for leads' contact information after the segmentation.

However, for the sales team strategy, ineligible users are worth capturing for future outreach.

Impacts on the redesign:

  • Preserved the contact information at the beginning

  • Branched the form dynamically to identify the signing authority and reduce errors

DESIGN COLLABORATION

Creating a continuous journey for the registrant and signatory

spacer

After filling out the form and verifying their IDs, users still needed to ask the electricity account holder to sign the contract (if not registrant).

To minimize drop-off rates, I partnered with the product designer who owned the contract signing flow to create a fluid journey that felt unified for the user.

user research

Successful validation with usability testing and interviews

spacer

After conducting interviews and moderated usability testing, we observed a 62% reduction in input errors and less confusion within the flow, validating the redesign for implementation.

62%

input error reduction

7/9

task success

Role

• Senior Product Designer

Stack

• Figma: design, prototyping
• Figjam: user flow
• Notion: documentation

Outcome

• 62% input error reduction
• 7/9 task success

Year

2025

— REACH OUT

Curious about my approach?

Let's talk about the strategy behind these decisions.

— REACH OUT

Curious about my approach?

Let's talk about the strategy behind these decisions.

— NEXT CASE STUDY

Senior Product Designer

Turi Saúde

Rapid validation of AI features for a healthcare scriber

Led end-to-end UX strategy and design for the platform, including the successful launch of Turi’s experimentation tool

UX Strategy

Design & Build

AI-assisted

© Karina Sato 2026

Product Designer • San Francisco

© Karina Sato 2026

Product Designer • San Francisco

© Karina Sato 2026

Product Designer • San Francisco

Create a free website with Framer, the website builder loved by startups, designers and agencies.