Walid SASSI

👨🏾‍💻 iOS Tech Lead @Sephora | Author of AI-Driven Swift Architecture (Packt)
📘

[Walid SASSI @WalidSASSIIOS]

https://t.co/aTN7WJ73Lu

[Walid SASSI @WalidSASSIIOS]

A new article about Foundation models
https://t.co/hospsgyESf

[Walid SASSI @WalidSASSIIOS]

What happens when a simple transaction history screen becomes a real mobile system design problem?

That’s what @livsycode and I explore in episode 2 of our Mobile System Design Interview series, going live in 30 minutes.

The scenario: design the transaction history of a mobile banking application.

At first, it sounds straightforward:
show a list of transactions, open the details, add search and filters.

But then the real questions start:

- How do you paginate years of financial history?
- How do you model transaction states?
- How fresh does the data need to be?
- Should sensitive banking data be available offline?
- How do you design receipt/download APIs securely?
- Where should pagination cursors live in the mobile architecture?
- How do you explain these trade-offs in an interview?

In this episode, I’m the candidate and Artem is the interviewer.

We focus less on finding the “perfect” architecture and more on the reasoning process behind it: clarifying requirements, challenging assumptions, designing APIs, modeling the domain, and explaining architectural responsibilities clearly.

Because in a senior mobile system design interview, the goal is not to recite a template.

The goal is to think.

Join us live in 30 minutes

https://t.co/4YWUEKwwcX

[Walid SASSI @WalidSASSIIOS]

Performance is more than just speed https://t.co/LzNumUdlB6 via @YouTube

[Walid SASSI @WalidSASSIIOS]

https://t.co/0ubkmaLAzE
the third article about Evaluations Framework

[Walid SASSI @WalidSASSIIOS]

The second article about Evaluations framework

https://t.co/yx19cNGTvq

[Walid SASSI @WalidSASSIIOS]

Really Amazing!

[ClaudeDevs @ClaudeDevs]

Claude Code on desktop now works with the iOS simulator.

Build and run your iOS app, and the simulator opens in a panel right next to your conversation. Available today in public beta.

[Walid SASSI @WalidSASSIIOS]

This is the first episode about new Evaluations framework

https://t.co/hOcjkFCjbx

[Walid SASSI @WalidSASSIIOS]

Testing a foundation model with plain unit tests? Good luck, it's non-deterministic by nature.
My latest article dives into Apple's new Evaluations framework (Xcode 27 / iOS 27), and how it pairs with Swift Testing to actually measure the quality of AI-powered features, not just pass/fail, but datasets, metrics, evaluators, and synthetic sample generation, all built on a real TripPlanner example.
If you're building on Foundation Models and wondering how to test something that doesn't give you the same answer twice, this one's for you.

https://t.co/LDpeb8UMym

[Walid SASSI @WalidSASSIIOS]

check my first system design interview episode with @livsycode
https://t.co/ru4RzUNUo2

[Walid SASSI @WalidSASSIIOS]

We talk about iOS performance, SwiftUI, perceived performance, frame budgets, UIKit, and challenge some common performance myths 🔥

https://t.co/6V5cwM5SwB

[Walid SASSI @WalidSASSIIOS]

Our last episode of this season with Dave Poirier and Deya Elkhawaldeh

https://t.co/m5gKOiuzwS

[Walid SASSI @WalidSASSIIOS]

https://t.co/UhRGedSC7k

[Walid SASSI @WalidSASSIIOS]

you can find the full episode with @adrgrondin : https://t.co/GqyG9exXhP

[Walid SASSI @WalidSASSIIOS]

You can find Locally AI App created by Adrien: https://t.co/apsbZO9qhj

[Walid SASSI @WalidSASSIIOS]

discover MLX Swift and LM Studio with @adrgrondin
https://t.co/L1XzbNjWJI

[Walid SASSI @WalidSASSIIOS]

Cupertino MCP in depth
https://t.co/L6MJ27qKh8

[Walid SASSI @WalidSASSIIOS]

https://t.co/FHC3iuTMgw

[Walid SASSI @WalidSASSIIOS]

The feedback on our Swift book has been 🔥
Developers are reading it, applying it, and sharing great insights.

https://t.co/TEzDHmQ4Ss

If it helped you:
👉 drop a review (Amazon / Packt)
👉 or share your thoughts here

@Tr_Achraf @qcoding @natpanferova @PacktPublishing

[Mohammad Azam @azamsharp]

I was recently a guest on Swift With Walid podcast. We talked about Apple Foundation Model Framework.

It was quite an interesting discussion. We discussed the purpose of on-device models, generables, app architecture and much more.

You can watch it here: https://t.co/pvxDH8BAuC

#iosdev #swiftlang

[Walid SASSI @WalidSASSIIOS]

@azamsharp Thank you @azamsharp , it was really amazing