Lead Product Designer · 7 years

Designing products people trust & love.

I help companies shape the right product, design an experience people love, and build the systems and teams that ship it.

Product strategy Interaction design AI-native products Design systems Design leadership
Nelly Seiglan, Lead Product Designer
✦ Lead Product Designer7 years
Selected work
01VersoAI ResearchFounding Designer ↓ 02RoseAI AssistantFounding Designer ↓ 03KolectoFintech SaaSDesign Manager ↓ 04MilleisPrivate bankingLead Product Designer ↓ 05TheodoConsultingDesigner → Lead ↓
01

Verso

AI Research

Founding Designer. AI research platform helping teams turn interviews into trusted product insights.

€0K
ARR · first 10 months

Answer
Read the case study →Visit site ↗
02

Rose

AI Assistant

Founding Designer. AI sales agent helping B2B companies turn conversations into qualified leads.

0%
visitor conversion
01 · EngageGreets in context
02 · GuideGuided conversation
03 · ConvertIntent into action
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03

Kolecto

Fintech SaaS

Design Manager. Billing platform helping small businesses run their finances with confidence.

0
designers hired
Scanner
une facture
CraftScan, import & e-invoicing in two taps
Design leadership

As Lead Product Designer, I drive design across three squads shipping the Kolecto product.

Lead Product Design
Squad 01
Activation
Onboarding & first invoice sent
Squad 02
Rétention
Daily workflows & engagement
Squad 03
Paiement
Collection & cash-in flows
Read the case study →Visit site ↗
04

Milleis

Private banking

Lead Product Designer. Transforming a banking app into a wealth platform for two very different clients.

0★
App Store · from 2.7
Évaluation de vos produits en gestion
0,00 €
au 13 mars 2023
Gestion sous mandat / pilotéeGestion conseilléeGestion libre
Milleis
Milleis
User flow & navigation
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05 · Design consultant

Theodo

Three years as Designer → Lead Designer in consultancy. Shipping mobile and SaaS products for ambitious teams across banking, retail and health, then leading design on the engagements that mattered most.

0 yrs
Designer → Lead
0+
Products & engagements
Mobile
& SaaS products
Selected clients
Drouot
Milleis
AXA Climate
Micromania
ADA
Institut Analgesia
About & background

7 years at the intersection of product strategy and design craft.

From defining the right problem to refining the last interaction, I like staying close to both the product vision and the pixels.

  • HexaFounding DesignerHexa · AI-native products2025 → now
  • KolectoDesign ManagerKolecto · fintech SaaS2024 → 25
  • TheodoDesigner → Lead DesignerTheodo · Mobile & SaaS2021 → 24
  • DDB ParisNew BusinessDDB Paris · agency2019 → 21
LinkedIn ↗
Speaking

On stage · AI & design

Nelly speaking on stage
UpcomingSep 2026

Design Ops in the AI era

How design operations evolve when AI reshapes how teams research, prototype and ship.

Round tableJun 2026

When emotion becomes the design

AI Experience Night round table, featured by The Ticket: when conversation becomes the product.

TalkMar 2026

Conversational design for AI products

At AI Product Day, making conversation the core of the product experience.

Re:Design · Substack

Writing on design in the age of AI

Field notes on building AI-native products, read by a growing community of designers and product people.

Read on Substack ↗
Designing trust into AI interfacesESSAY ↗ What Design Ops becomes in the AI eraESSAY ↗ From 0 → 1 as a founding designerNOTES ↗
Get in touch

Let's build something
people trust & love.