Ilgın Sezer
Write to me

I'm Ilgın Sezer, and I design products people open every day: courier apps, transit cards, a neighbourhood shop's first website. Nine years from Istanbul, working inside the team.

Open to a new project from November 2026. Read the 30-second summaries first, then open the full case that catches your eye.

Istanbul time · GMT+3

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Selected work

Reading mode

Mobile product · 2025

Rota

We rebuilt the driver app so couriers stop waiting at the door.

The driver app of a city courier company: delivery flow, handover code and a record that keeps working when the signal drops.

Role
Lead product designer
Length
14 weeks
Team
2 designers, 5 developers, 1 researcher
Field researchMobile flowOffline state
A courier on the move in evening light

Problem

Couriers jumped between three screens on every delivery; in a basement or a lift the signal dropped and the delivery record was lost.

My part

I planned the field days and designed the delivery flow and the handover code screen. The map screen was a teammate's.

Outcome

A delivery ends on one screen; once the code is entered, the record waits on the phone until the signal returns.

Mobile product · 2024

Durak

Don't find out your balance at the turnstile: a transit card app.

Top-ups, balance alerts and trip history in one app; a top-up takes two steps.

Role
Product designer
Length
10 weeks
Team
1 product manager, 4 developers
Usability testingPayment flow

Web · 2024

Mahal

One-page websites for neighbourhood shops, updated from a phone.

Stationers, tailors, bakeries: hours, address and services current every day; the owner edits them on one screen.

Role
Co-founder, design
Length
6 months
Team
1 developer partner
Product framingWeb templateAdmin panel

Design system · 2023

Kese

A system that got three teams speaking one language in a budgeting app.

Rules for colour, type, amount formatting and dark mode; core components and a documentation site.

Role
Design system lead
Length
5 months
Team
3 designers, 6 developers
Design systemDark modeDocumentation
Lettering drawn on tracing paper over a light table
Ilgın at her desk looking at a colour swatch book

I work inside the team, down to the product's dullest screen.

I started out drawing interfaces at an agency, then moved to product teams. Today I'm freelance: I join a team and stay on the work from research to the developer handover file. I work in Figma and Framer, and I like testing prototypes in the field.

2024-now

Freelance product designer

Sprints and redesigns with startups and product teams.

2021-2024

Senior product designer · urban logistics

Driver and customer apps, field research.

2019-2021

Product designer · personal finance

Budgeting app, design system and dark mode.

2017-2019

Interface designer · digital agency

Campaign sites and first mobile projects.

Three ways to work together

Fees depend on scope and are set out in the proposal. Every format includes a weekly screen-share review.

User flow and sticky notes in a notebook

Design sprint

1 week

One flow end to end: we write the problem together, I sketch two directions and on Friday I deliver a prototype you can test with real users. Unlimited small fixes within the sprint.

Product redesign

6-10 weeks

Research, flow map, interface and a developer handover file. Two major revision rounds included; out-of-scope requests are discussed separately.

Monthly product partnership

3 months minimum

Two days a week inside your team: planning meetings, design system upkeep and daily work in the same channel as your developers.

Questions

Weekdays 10:00-18:00 Istanbul time (GMT+3). With teams in Europe we're 1-2 hours apart and work within the same day.

Write to me about your next product.

hello@ilginsezer.com
November 2026Room for 1 sprint
December 2026Open for a redesign
Reply time2 working days
What do you have in mind?

Design sprint: 1 week. One slot open in November 2026; starts Monday, prototype delivered Friday.

I reply within 2 working days.