Point of Sale (POS) - HMI
Point of Sale (POS) - HMI
Point of Sale (POS) - HMI
Simplifying how businesses track every payment
Simplifying how businesses track every payment
Simplifying how businesses track every payment
Point of Sale (POS) - HMI
Simplifying how businesses track every payment
Project
Project
HMI | Android POS
Redesign
HMI | Android
POS Redesign
Industry
Industry
Retail Technology
/ Fintech
Retail
Technology
/ Fintech
Date
Date
March - 2025
March - 2025
Duration
Duration
3 weeks
Overview.
Overview.
Overview.
Speed is the new simplicity.
Speed is the new simplicity.
Speed is the new simplicity.
My role
My role
Led end-to-end UX and UI design, Mapped user workflows from transaction to reconciliation, conducted heuristic analysis on existing systems, and rebuilt a human–machine interface focused on clarity, accuracy, and real-time decision speed.
Led end-to-end UX and UI design, Mapped user workflows from transaction to reconciliation, conducted heuristic analysis on existing systems, and rebuilt a human–machine interface focused on clarity, accuracy, and real-time decision speed.
Team
Team
Solo Project — 1-Man Army
Handled UX research, UI design, HMI logic, motion, and interaction system independently.
Solo Project — 1-Man Army
Handled UX research, UI design, HMI logic, motion, and interaction system independently.
Duration
Duration
3 Weeks
Design sprint + HMI usability iteration
3 Weeks
Design sprint + HMI usability iteration
3 Weeks
Design sprint + HMI usability iteration
01. Context / Problem
01. Context / Problem
01. Context / Problem
The modern POS machine should be fast, secure, and effortless but most still feel like legacy tools wrapped in touchscreens.
The modern POS machine should be fast, secure, and effortless but most still feel like legacy tools wrapped in touchscreens.
The modern POS machine should be fast, secure, and effortless but most still feel like legacy tools wrapped in touchscreens.
Vendors across small retail stores, petrol bunks, and delivery counters rely on Android POS devices daily, yet they struggle with one basic task: finding specific transaction records.
Vendors across small retail stores, petrol bunks, and delivery counters rely on Android POS devices daily, yet they struggle with one basic task: finding specific transaction records.
Vendors across small retail stores, petrol bunks, and delivery counters rely on Android POS devices daily, yet they struggle with one basic task: finding specific transaction records.
Vendors across small retail stores, petrol bunks, and delivery counters rely on Android POS devices daily, yet they struggle with one basic task: finding specific transaction records.
The gap wasn’t in payment speed, but in post-payment clarity the very stage where UX should bring peace of mind.
The gap wasn’t in payment speed, but in post-payment clarity the very stage where UX should bring peace of mind.
The gap wasn’t in payment speed, but in post-payment clarity the very stage where UX should bring peace of mind.
View Actual Case study
View Actual Case study
View Actual Case study
Challenges faced by vendor's
Challenges faced by vendor's
Challenges faced by vendor's
No search. No smart filters. No instant visibility.
Every time a customer asks, “Can you check my payment?”, the vendor scrolls endlessly through logs, guessing timestamps and IDs. This manual hunt wastes time and undermines customer trust.
No search. No smart filters. No instant visibility.
Every time a customer asks, “Can you check my payment?”, the vendor scrolls endlessly through logs, guessing timestamps and IDs. This manual hunt wastes time and undermines customer trust.
No search. No smart filters. No instant visibility.
Every time a customer asks, “Can you check my payment?”, the vendor scrolls endlessly through logs, guessing timestamps and IDs. This manual hunt wastes time and undermines customer trust.
No search. No smart filters. No instant visibility.
Every time a customer asks, “Can you check my payment?”, the vendor scrolls endlessly through logs, guessing timestamps and IDs. This manual hunt wastes time and undermines customer trust.
02. Research & Insights
02. Research & Insights
02. Research & Insights
To understand what broke the experience, I began by talking to seven small business owners using common Android POS machines.
To understand what broke the experience, I began by talking to seven small business owners using common Android POS machines.
To understand what broke the experience, I began by talking to seven small business owners using common Android POS machines.
Primary Research
Primary Research
Our primary user persona, Akshay Kandiga, a 34-year-old grocery shop owner from Udupi, manages hundreds of daily transactions. Despite being tech-savvy, he struggled to trace a single payment when a dispute arise.
Our primary user persona, Akshay Kandiga, a 34-year-old grocery shop owner from Udupi, manages hundreds of daily transactions. Despite being tech-savvy, he struggled to trace a single payment when a dispute arise.
Our primary user persona, Akshay Kandiga, a 34-year-old grocery shop owner from Udupi, manages hundreds of daily transactions. Despite being tech-savvy, he struggled to trace a single payment when a dispute arose.
Our primary user persona, Akshay Kandiga, a 34-year-old grocery shop owner from Udupi, manages hundreds of daily transactions. Despite being tech-savvy, he struggled to trace a single payment when a dispute arose.
Primary insights
Primary insights
Vendors spend 2–5 minutes searching for one transaction.
100% of users wanted filters for date, amount, and method.
Frustration peaks during customer disputes.
Vendors spend 2–5 minutes searching for one transaction.
100% of users wanted filters for date, amount, and method.
Frustration peaks during customer disputes.
Primary insights
Secondary Research:
Secondary Research:
Secondary Research:
From Statista, MarketWatch, and NPCI reports (2023–2024)
72% of small vendors in India rely on POS for daily transactions.
65% growth in UPI-based payments → urgent need for mode-specific log filters.
Square POS implemented and improved efficiency by 25% through advanced search.
From Statista, MarketWatch, and NPCI reports (2023–2024)
72% of small vendors in India rely on POS for daily transactions.
65% growth in UPI-based payments → urgent need for mode-specific log filters.
Square POS implemented and improved efficiency by 25% through advanced search.
The data was clear: efficiency and trust were missing from India’s POS ecosystem and both could be restored through better UX.
The data was clear: efficiency and trust were missing from India’s POS ecosystem and both could be restored through better UX.
The data was clear: efficiency and trust were missing from India’s POS ecosystem and both could be restored through better UX.
03. Finding the Friction
03. Finding the Friction
03. Finding the Friction
The deeper we went, the more technical friction surfaced.
Hardware & HMI Constraints
Hardware & HMI Constraints
Small screens (4–6 inch) limited how much information could appear at once.
Touch calibration errors and glare made fine UI elements risky.
Slow processors meant every visual needed to be light, layered, and instant.
Small screens (4–6 inch) limited how much information could appear at once.
Touch calibration errors and glare made fine UI elements risky.
Slow processors meant every visual needed to be light, layered, and instant.
Primary insights
UX Constraints
UX Constraints
UX Constraints
Current interfaces lacked visual hierarchy & all transactions looked identical.
Export options existed but were rigid (only unsorted CSV).
No clear mapping between payment method and status (Success, Pending, Failed).
Current interfaces lacked visual hierarchy & all transactions looked identical.
Export options existed but were rigid (only unsorted CSV).
No clear mapping between payment method and status (Success, Pending, Failed).
This wasn’t a cosmetic redesign; it was a human–machine interface problem.
This wasn’t a cosmetic redesign; it was a human–machine interface problem.
This wasn’t a cosmetic redesign; it was a human–machine interface problem.
04. Ideation & Concept Development
04. Ideation & Concept Development
04. Ideation & Concept Development
To rebuild clarity into the flow, I used task simplification and contextual filtering as guiding principles.
To rebuild clarity into the flow, I used task simplification and contextual filtering as guiding principles.
To rebuild clarity into the flow, I used task simplification and contextual filtering as guiding principles.
Find Faster - Advanced Search & Filter
A search bar sits at the top of every screen, with filters for date, amount, and payment method.
Color-coded categories (Completed / Refund / Pending) allow instant scanning.
See Smarter - Transaction Categorization & History Overview
Logs auto-group by type and display a daily summary - total sales, refunds, and disputes giving vendors context before details.
Act Quicker - Easy Export & Sharing
Customizable exports (PDF, CSV, Excel) with smart templates like Today / This Week / Custom Range.
Find Faster - Advanced Search & Filter
A search bar sits at the top of every screen, with filters for date, amount, and payment method.
Color-coded categories (Completed / Refund / Pending) allow instant scanning.
See Smarter - Transaction Categorization & History Overview
Logs auto-group by type and display a daily summary - total sales, refunds, and disputes giving vendors context before details.
Act Quicker - Easy Export & Sharing
Customizable exports (PDF, CSV, Excel) with smart templates like Today / This Week / Custom Range.
Find Faster - Advanced Search & Filter
A search bar sits at the top of every screen, with filters for date, amount, and payment method.
Color-coded categories (Completed / Refund / Pending) allow instant scanning.
See Smarter - Transaction Categorization & History Overview
Logs auto-group by type and display a daily summary - total sales, refunds, and disputes giving vendors context before details.
Act Quicker - Easy Export & Sharing
Customizable exports (PDF, CSV, Excel) with smart templates like Today / This Week / Custom Range.
Each design decision aimed to minimize cognitive effort on a limited HMI screen enabling “glance, tap, done” behavior.
Each design decision aimed to minimize cognitive effort on a limited HMI screen enabling “glance, tap, done” behavior.
Each design decision aimed to minimize cognitive effort on a limited HMI screen enabling “glance, tap, done” behavior.
05. Final Design & Experience
05. Final Design & Experience
05. Final Design & Experience
The final interface brought precision and calm to the POS experience.
The final interface brought precision and calm to the POS experience.
Every screen reinforces these Steps
Find Faster → See Smarter → Act Quicker
Every screen reinforces these Steps
Find Faster → See Smarter → Act Quicker
Every screen reinforces these Steps
Find Faster → See Smarter → Act Quicker
Every screen reinforces these Steps
Find Faster → See Smarter → Act Quicker
Final Design & Prototype
Final Design & Prototype
Final Design & Prototype
06. Results & Reflection
06. Results & Reflection
06. Results & Reflection
This project revealed how micro-efficiency defines macro trust in transaction systems.
This project revealed how micro-efficiency defines macro trust in transaction systems.
This project revealed how micro-efficiency defines macro trust in transaction systems.
Results (Prototype Feedback)
Vendors located transactions 60% faster in prototype trials.
Users favored color-coded feedback for clarity.
Export feature adoption jumped instantly “Finally, something that feels professional.”
Results (Prototype Feedback)
Vendors located transactions 60% faster in prototype trials.
Users favored color-coded feedback for clarity.
Export feature adoption jumped instantly “Finally, something that feels professional.”
Results (Prototype Feedback)
Vendors located transactions 60% faster in prototype trials.
Users favored color-coded feedback for clarity.
Export feature adoption jumped instantly “Finally, something that feels professional.”
What I Learned
HMI design is not about fitting UI on small screens it’s about translating machine behavior into human logic.
Even a 1-second reduction in friction compounds into smoother service, better trust, and more sales.
What I Learned
HMI design is not about fitting UI on small screens it’s about translating machine behavior into human logic.
Even a 1-second reduction in friction compounds into smoother service, better trust, and more sales.
What I Learned
HMI design is not about fitting UI on small screens it’s about translating machine behavior into human logic.
Even a 1-second reduction in friction compounds into smoother service, better trust, and more sales.
Primary
Research
Primary
Research
