Jun Park

Reading mode

Jun Park

Reading mode

Jun Park

Reading mode

Case studies

Five projects on trains, clinics, invoices, job sheets and shared components. Read each in a few minutes, or switch to Skim and take the gist in one.

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Showing 5 of 5 case studies

Three Ligne app screens side by side on a pale blue background: the search form, the results list and a trip detail with a transfer at Central Station marked six minutes to spare.

Ligne ·

2026

Trip planner that plans for the transfer

Riders trusted the planner’s timetable but not its transfers: one in seven trips with a change ended in a missed connection.

Riders missed 31% fewer connections in the 12 weeks after launch.

Mobile

Read 4 min ·

Skim 1 min

Three Ligne app screens side by side on a pale blue background: the search form, the results list and a trip detail with a transfer at Central Station marked six minutes to spare.

Ligne ·

2026

Trip planner that plans for the transfer

Riders trusted the planner’s timetable but not its transfers: one in seven trips with a change ended in a missed connection.

Riders missed 31% fewer connections in the 12 weeks after launch.

Mobile

Read 4 min ·

Skim 1 min

Three Ligne app screens side by side on a pale blue background: the search form, the results list and a trip detail with a transfer at Central Station marked six minutes to spare.

Ligne ·

2026

Trip planner that plans for the transfer

Riders trusted the planner’s timetable but not its transfers: one in seven trips with a change ended in a missed connection.

Riders missed 31% fewer connections in the 12 weeks after launch.

Mobile

Read 4 min ·

Skim 1 min

Three Clinica intake screens on a pale sage background: the reason for the visit, a medication step with a photo upload, and the review step with allergy flags.

Clinica ·

2025

Patient intake in four minutes

New patients met a 63-field form built like a paper document, and the front desk retyped most of it.

Median intake time fell from 11 to 4 minutes, and 91% of patients now arrive with the form done.

Web app

Read 4 min ·

Skim 1 min

Three Clinica intake screens on a pale sage background: the reason for the visit, a medication step with a photo upload, and the review step with allergy flags.

Clinica ·

2025

Patient intake in four minutes

New patients met a 63-field form built like a paper document, and the front desk retyped most of it.

Median intake time fell from 11 to 4 minutes, and 91% of patients now arrive with the form done.

Web app

Read 4 min ·

Skim 1 min

Three Clinica intake screens on a pale sage background: the reason for the visit, a medication step with a photo upload, and the review step with allergy flags.

Clinica ·

2025

Patient intake in four minutes

New patients met a 63-field form built like a paper document, and the front desk retyped most of it.

Median intake time fell from 11 to 4 minutes, and 91% of patients now arrive with the form done.

Web app

Read 4 min ·

Skim 1 min

The Tally invoice editor in a browser window on a butter-yellow background: a form on the left for client, description and amount, and a live PDF preview of invoice 0014 for €1,800 on the right.

Tally ·

2024

Invoices freelancers send on day one

New users had to finish a six-step setup before they could create an invoice, and most never got around to sending one.

The share of new users who sent an invoice in their first week rose from 38% to 71%.

Web app

Read 4 min ·

Skim 1 min

The Tally invoice editor in a browser window on a butter-yellow background: a form on the left for client, description and amount, and a live PDF preview of invoice 0014 for €1,800 on the right.

Tally ·

2024

Invoices freelancers send on day one

New users had to finish a six-step setup before they could create an invoice, and most never got around to sending one.

The share of new users who sent an invoice in their first week rose from 38% to 71%.

Web app

Read 4 min ·

Skim 1 min

The Tally invoice editor in a browser window on a butter-yellow background: a form on the left for client, description and amount, and a live PDF preview of invoice 0014 for €1,800 on the right.

Tally ·

2024

Invoices freelancers send on day one

New users had to finish a six-step setup before they could create an invoice, and most never got around to sending one.

The share of new users who sent an invoice in their first week rose from 38% to 71%.

Web app

Read 4 min ·

Skim 1 min

Three Fieldnote screens on a pale lavender background: the day’s job list, an open job with a large parts stepper and a status line reading 3 waiting to send, and a sign-off screen with a Close job button.

Fieldnote ·

2023

A job sheet that works offline

The job sheet needed a connection to save, but technicians work in basements and lift shafts, so notes went missing and parts were not ordered.

Repeat visits fell 22%, and 93% of jobs are now closed on site.

Mobile

Read 4 min ·

Skim 1 min

Three Fieldnote screens on a pale lavender background: the day’s job list, an open job with a large parts stepper and a status line reading 3 waiting to send, and a sign-off screen with a Close job button.

Fieldnote ·

2023

A job sheet that works offline

The job sheet needed a connection to save, but technicians work in basements and lift shafts, so notes went missing and parts were not ordered.

Repeat visits fell 22%, and 93% of jobs are now closed on site.

Mobile

Read 4 min ·

Skim 1 min

Three Fieldnote screens on a pale lavender background: the day’s job list, an open job with a large parts stepper and a status line reading 3 waiting to send, and a sign-off screen with a Close job button.

Fieldnote ·

2023

A job sheet that works offline

The job sheet needed a connection to save, but technicians work in basements and lift shafts, so notes went missing and parts were not ordered.

Repeat visits fell 22%, and 93% of jobs are now closed on site.

Mobile

Read 4 min ·

Skim 1 min

The Parcel component library on a clay-coloured background: a grid of cards showing buttons, a field, a date picker, status badges, a table row and a nine-step green colour ramp.

Parcel ·

2022

One design system for four products

Four products had grown four interfaces: 412 distinct UI components, nine kinds of primary button and fourteen shades of green.

Unique UI components fell from 412 to 96 across four products.

Design system

Read 4 min ·

Skim 1 min

The Parcel component library on a clay-coloured background: a grid of cards showing buttons, a field, a date picker, status badges, a table row and a nine-step green colour ramp.

Parcel ·

2022

One design system for four products

Four products had grown four interfaces: 412 distinct UI components, nine kinds of primary button and fourteen shades of green.

Unique UI components fell from 412 to 96 across four products.

Design system

Read 4 min ·

Skim 1 min

The Parcel component library on a clay-coloured background: a grid of cards showing buttons, a field, a date picker, status badges, a table row and a nine-step green colour ramp.

Parcel ·

2022

One design system for four products

Four products had grown four interfaces: 412 distinct UI components, nine kinds of primary button and fourteen shades of green.

Unique UI components fell from 412 to 96 across four products.

Design system

Read 4 min ·

Skim 1 min

Also worked on

Smaller projects without a full case study. Ask and I will walk you through any of them.

  • 2026

    Service-alert emails

    Ligne

    Rewrote the disruption email so the first line says what to do. 41 words shorter.

  • 2026

    Service-alert emails

    Ligne

    Rewrote the disruption email so the first line says what to do. 41 words shorter.

  • 2025

    Appointment reminders

    Clinica

    SMS wording tested in three languages. No-shows fell from 14% to 11%.

  • 2025

    Appointment reminders

    Clinica

    SMS wording tested in three languages. No-shows fell from 14% to 11%.

  • 2024

    Onboarding checklist

    Tally

    A five-item checklist that replaced a nine-step product tour.

  • 2024

    Onboarding checklist

    Tally

    A five-item checklist that replaced a nine-step product tour.

  • 2023

    High-contrast job sheet

    Fieldnote

    A theme for technicians working in vans and basements, tested in direct sun.

  • 2023

    High-contrast job sheet

    Fieldnote

    A theme for technicians working in vans and basements, tested in direct sun.

  • 2022

    Icon audit

    Parcel

    312 icons reduced to 148, drawn at one stroke weight on one grid.

  • 2022

    Icon audit

    Parcel

    312 icons reduced to 148, drawn at one stroke weight on one grid.

  • 2021

    Depot check-in kiosk

    Parcel

    A gate-side touch flow for drivers, with gloved-hand tap targets.

  • 2021

    Depot check-in kiosk

    Parcel

    A gate-side touch flow for drivers, with gloved-hand tap targets.

© 2026 Jun Park · Montréal ·

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