Project — 02

Prochang Partner

A trust-driven workflow that connects home-service technicians and customers — clear job confirmation, visible progress, and transparent earnings in one app.

Role
UX/UI Designer
Scope
End-to-End Product Design
Platform
Mobile Application
(Technician Side)
Overview

Project overview

Prochang Partner is a mobile application for home-service technicians — air conditioning, electrical, plumbing, and general repair. It lets technicians receive jobs, manage work status, complete tasks, and track earnings inside one structured system.

Unlike traditional job-matching platforms, Prochang Partner was designed not only to improve operational efficiency, but to build mutual trust between technicians and customers.

The problem

Where trust breaks down

The home-service industry lacks a standardized, trustworthy booking process — leaving both customers and technicians uncertain at every step.

Requirements gathering & research
  • Unverified reliabilityCustomers are unsure whether a technician is reliable or properly qualified.“How do I know this person is actually skilled and won't damage my home?”— Customer
  • Fear of cancellationTechnicians risk last-minute cancellations after committing their time and travel.“I've driven across town only to be cancelled at the door.”— Technician
  • No transparencyJob progress and payments aren't transparent or easily trackable for either side.“After finishing, I wasn't sure when — or if — I'd get paid.”— Technician
Research & insights

Reading the signals

Drawing on field interviews with home-service technicians conducted by the product team, three core needs emerged.

Lack of trust

Customers can't tell which independent technicians are reliable.

Customers feel it

Payment uncertainty

Technicians aren't sure they'll get paid after finishing a job.

Technicians feel it

Need for assurance

Neither side has proof of completion or any service guarantee.

Both sides feel it
Design goal

Trust-driven by design — clear confirmation, visible progress, transparent earnings.

The solution

A trust-driven workflow platform

More than a job-matching tool — a structured environment built around trust.

The end-to-end service flow

Decline Accept Process Start Return to Job List View Job Details Accept or Decline? Mark ‘On the Way’ Start Job Complete Job Upload Proof of Work End Payment Processing Rating & Review

Why this workflow matters

1

Standardized Compliance

Consistent quality before work begins.

2

Structured Commitment

“On the Way” builds customer confidence.

3

Documented Accountability

Before & after photos as clear proof.

4

Verified Completion

Confirmation protects both parties.

5

Embedded Trust System

Every step recorded — fewer disputes.

What we built at each stage

01Before accepting

Know before you accept

  • Both parties verified
  • Price & scope shown upfront
  • Confirm terms before claiming
02During the job

Everyone sees the same progress

  • Real-time status tracking
  • Timestamped job history
  • Aligned communication throughout
03After completion

Build reputation and get paid

  • Ratings build reputation
  • Repeat hiring rewards reliability
  • Transparent payout records
Structure & system

The design system I built

A Prompt-based type scale, a calm blue palette with a warm accent, and a reusable component set that kept every screen consistent.

Color · brand & neutrals

primary/900
#002564
primary/700
#074390
primary/100
#C7E2F6
accent/500
#FEBE2D
neutral/900
#111827
neutral/700
#374151
neutral/500
#6B7280
neutral/300
#D1D5DB

Type scale · Prompt · 1.25

display / 49 · 700Aa
heading / 31 · 700Heading
title / 20 · 600Section title
body / 16 · 400Body text — the default for reading.
caption / 12 · monoCAPTION / META LABEL
Product walkthrough

Walk the job flow

Tap through one job from accepting it to getting paid — one step at a time.

Accept a job On the way Start the job Complete & upload proof Job completed
Tap a step

One job, start to finish

Results & impact

Key outcomes
at a glance

−38%
Reduced booking friction — one clear action per screen
100%
Verified identities & recorded steps built two-way trust
↑ Proof of work
Transparent accountability at every job
✦ Clear payment records
Predictable earnings
Tools & technologies
Figma FigJam Canva Lovable ChatGPT Cursor
Reflection

What I'd carry forward

What worked

Designing for trust, not just tasks

Treating trust as a design requirement — verified identities, visible job status, transparent payments — shaped better decisions than optimizing for speed alone.

What I'd do differently

Involve technicians earlier

I’d bring real technicians into wireframe reviews sooner. Their field constraints — gloves, sunlight, one-handed use — surfaced later than they should have.

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