Carl Anderson

VP Engineering at Qonto (@getqonto). Paris.
Previously running engineering at Ledger, Trainline, and Deezer.

[Carl Anderson @CRLNDRSN]

12/12
TL;DR
We could've gone the easy route: create an account, store your data in our database, call it a day.

But that's not who we are. At Ledger, we believe no one should own your data except you.

So we built something better: Ledger Sync.

➡️ Data lives server‑side
➡️ Only you can read it
➡️ Open standard for builders
➡️ Private by default. Exactly how cloud should be.

[Carl Anderson @CRLNDRSN]

1/12
🧵Let's talk about @Ledger Sync — the feature that brings Web2 convenience to self-custody without compromising our privacy.

[Carl Anderson @CRLNDRSN]

11/12
Open for builders: with a @Ledger device and our Device Management Kit, any app can do this—private cloud sync, encrypted chats, shared docs, you name it.

https://t.co/jXwSzgSLsk

[Zenbirb @zenbirb]

I’ve always kept most of my coins on my Ledger.

But ngl, using hardware wallets with dApps used to feel like extra steps and mini headaches.

Today I tried connecting my @Ledger straight to @1inch and it just worked in one click.

No juggling or weird prompts.

For someone who actually cares about self-custody and speed, this is the type of upgrade that matters.

Secure hands, smooth swaps &
Feels right.

[Carl Anderson @CRLNDRSN]

@aarongillett Well spotted, it’s a copy/paste error, that’s our internal testing url.
Here’s the prod one: https://t.co/8aCoTCgqEM

[Carl Anderson @CRLNDRSN]

🚨 Today, we are proud to introduce three new dev kits part of the @Ledger SDK galaxy, allowing you to effortlessly connect to Ledger devices and interact with apps installed on them: the Device Management Kit, the Device Signer Kit and the Context Module

[Carl Anderson @CRLNDRSN]

@danielnordh Only web for now

[Carl Anderson @CRLNDRSN]

1/10
👋 Yesterday at Ledger Op3n, we announced a new brick in our developer toolkit:

Ledger Direct Connectivity — a direct, secure way for dApps to connect with Ledger devices.
https://t.co/OCcIjBJ6dE
#LedgerOp3n2025 @Ledger

🧵Let me walk you through what this is 👇

[Carl Anderson @CRLNDRSN]

10/10
You can try it today on https://t.co/wulTT4bqtk.

Connect your Ledger. Pick an account. Swap.

This is Ledger Direct Connectivity — hardware-level security with web-level convenience.
#LedgerOp3n2025 #Web3 @Ledger @1inch
https://t.co/OCcIjBJ6dE

[Carl Anderson @CRLNDRSN]

9/10
🧩 Ledger Direct Connectivity is:
➡️ Built on the Device Management Kit
➡️ Open and modular
➡️ Compatible with any dApp stack