coreyja

@coreyja.com

Full-stack architect with two decades of web expertise I help coders level up their engineering careers Check out my site: https://coreyja.com

COREY ALEXANDER
RUST DEVELOPER AND LIVE STREAMER

357 STRENGTH · TOP 15%

CLAUDE OPUS 4.8 SAYS

SOFTWARE DEVELOPER AND CONTENT CREATOR KNOWN ONLINE AS 'COREYJA', PRODUCING RUST PROGRAMMING TUTORIALS, LIVESTREAMS, AND BLOG POSTS ABOUT WEB DEVELOPMENT.

Pds Moover showing all 142 of my 110 blobs are migrated

Screenshot of AT Toolbox app showing a successful backup

Screenshot of the AT Toolbox app showing a “shortcut.BlobDownloadError error 2” message

Screenshot of the ISSEN language learning app. It’s supposed to be the first convo with an AI Spanish tutor. It starts out ok, then melds into a random English words mixed with Spanish. By the end we get random words and some Chinese characters added in. Feels like an Open weight LLM model

Screenshot of my minted agent meal. My serial number is 69

Screenshot of Claude Max usage dashboard showing my weekly limit. It’s at 99% full and resets in 21hr 11min

Screenshot with the following text

Ha, yeah that Chinese character (项目管理 means "project management" in Chinese) was probably a hallucination from a previous Byte Time session — the model got creative with a tag.

Photo of a creek with the edge of a computer in the foreground. On either side of the creek are rocks and leaves on the banks. It’s sunny and beautiful, blue sky is just peaking into the corner of the frame

The computer has a dark color scheme and a code editor open, but is heavily blurred

Screenshot from bizee, which I used to register my new LLC

Text of screenshot is the following

Company Info
COREYJA LLC

Company Address
28 Spring St #5063,

Princeton, New

Jersey 08542 Us
State Status
Pending
Naics Code
Professional,

Scientific, and

Technical Services

(54)
Naics Subcode
Custom Computer

Programming

Services (541511)
Formation State
New Jersey
Entity Type
LLC

Screenshot from the Bluesky app of two skeets

The first one starts with “where do I get started on an app view implementation”

The second skeet is of a screenshot of code and its output which is a list of skeets. The first skeet in the list is the same one as my screenshot

Screenshot from my new app showing us downloading all the blobs from j4ck.xyz’s account. We are 23% done in this screenshot

Video Recording of me demoing the new iOS app I am working on

I click the Run Button in Xcode and wait for the Simulator to open

Then I click "Add" and type in my handle

I see a new list item for my account with my did, clicking it opens a detail screen with a start button. When we click that a progress bar appears, and it fulls up as we download blobs

Screenshot of Xcode showing a new project called `AtProtoBackup`

Screenshot from my iOS about page showing my phone and software versions

iOS Version
26.0

Model Name
iPhone 16 Pro

Model Number
MYML3LL/A

Pro Plan
To read more about Pro plan usage limits, see About Claude Pro usage.
• Pro ($20/month): Average users can send approximately 45 messages with Claude every 5 hours, OR send approximately 10-40 prompts with Claude Code every 5 hours.
• Model access: Pro plan subscribers can access Sonnet 4, but won't be able to use Opus 4 with Claude Code.
• Best for: Light work on small repositories (typically under 1,000 lines of code)

Sketches of a planter on graph paper. On top we see a top down view showing all 4 walls and their joiners. This helped me make sure the sides would all fit together

On the bottom is a view of what a single side looked like. It was two cedar planks joined by a cedar strip to give the planter the height it needed

A raised bed garden box filled with soil and with herbs planted. There are also a few yellow flowers to help keep the animals away

A hand drawn Fathers Day card, with a pencil portrait of me holding our Daughter with the words “Happy Father’s Day” below. Made for me by my amazing wife!

Photo of a pint glass with ice and mostly opaque brown coffee colored liquid with ice and an orange straw. In the background is a window outside with a lawn and trees

Screenshot of the Github UI showing a review comment left by "Copilot"

It reads "Copilot reviewed 34 out of 54 changed files in this pull request and generated no comments."

Screenshot from the Namecheap dashboard showing the domain name `coreyja.is` in my account as Active

Screenshot of a successful oauth screen with Bluesky. Its basic text on a white background.
It reads as follows

Authentication Successful
You are now authenticated with Bluesky.

DID: coreyja.com

Access token expires in: 3599 seconds

Refresh token: true

Slack message with the contents "Woah! I'm here! I refreshed the desktop and it finally worked :tada:
Hopefully that means its really back up, that was a looong outage lol"

However its greyed out and below it is the message "Slack couldn’t send this message Try again | Cancel"

Screenshot from porkbun, my domain registrar, showing a new domain name `pfp.blue`

Vertical photo of ice in a tree branch against a grey sky. Cutting across the frame is a branch with lots of small “spikes” of ice facing down. There is one really long one in the center of the shot

Screenshot of a Github diff view

The highlighted changed is changing `latest` to `v3.4.17` in the URL we are downloading tailwindcss from

Me holding our new baby girl. I’m smiling looking down at her as I hold her in my outstretched arms. You can see the top of her head with some curly hair, and a few fingers and hands that she’s waving around a bit.
I’m so excited to be able to hold our girl finally!

“y’all got any more of that” Dave Chappell meme with the caption: Y’all got any more episodes of Self Directed Research

Two pairs of 3D printed New Years glasses that printed overlapping so now it’s just a mess of “lenses” and arms sticking out in random directions

$fn print_string(s: &str) { println!("{}", s); } fn main() { let my_string = String::from("Hello, world!"); print_string(&my_string); }$

let nums = vec![1, 2, 3, 4, 5];
let sum: i32 = nums.iter().filter(|x| *x % 2 == 0).sum();
println!("Sum: {}", sum);

$#[non_exhaustive] pub enum Color { Red, Green, Blue, } fn main() { let color = Color::Red; match color { Color::Red => println!("It's red!"), Color::Green => println!("It's green!"), Color::Blue => println!("It's blue!"), _ => println!("It's a new color!"), } }$

$/// The `add` function adds two numbers /// /// # Examples /// /// let result = add(2, 3); /// assert_eq!(result, 5); /// pub fn add(a: i32, b: i32) -> i32 { a + b }$

$#[must_use] enum OrderStatus { OrderPlaced, MustRetry, Failed } fn important_function() -> OrderStatus { todo!("Some fancy implementation") } fn main() { important_function(); // warning: unused `OrderStatus` that must be used // help: use `let _ = ...` to ignore the resulting value }$

Two cats sitting on a window sill together. There is a black and white one on the left and a black one on the right both looking at the camera

Mini 3D printed iPhones. There are 5 of them printed in 3 different colors; Dark blue, light blue and purple.
The color is for the outer shell and the inner “screen” is white

Pictured on top of a Stardew Valley Record Mat that my wife got me recently

Grey background with white text that reads “manic pixie OCaml dev”

Sleepy blank and white cat curled up on the top edge of the couch. His eyes are closed and his legs are crossed

$struct Person { name: String, age: u32 } impl std::fmt::Display for Person { fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { write!(f, "{} ({} years old)", self.name, self.age) } } fn main() { let person = Person { name: "Alice".to_string(), age: 30 }; println!("{}", person); // Output: Alice (30 years old) }$

$println!("Size of i32: {}", std::mem::size_of::<i32>()); //output: Size of i32: 4 println!("Size of i64: {}", std::mem::size_of::<i64>()); //output: Size of i64: 8 println!("Size of String: {}", std::mem::size_of::<String>()); //output: Size of String: 24$

$let mut vec = Vec::with_capacity(10); for i in 0..10 { vec.push(i); }$

$#[cfg(test)] mod tests { use std::thread; use std::time::Duration; #[test] fn quick_test() { assert_eq!(2 + 2, 4); } #[test] #[ignore] fn slow_test() { // Simulate a long-running test thread::sleep(Duration::from_secs(5)); assert!(true); } }$

$macro_rules! create_function { ($func_name:ident) => { fn $func_name() { println!("You called {:?}()", stringify!($func_name)); } }; } create_function!(foo); create_function!(bar); fn main() { foo(); bar(); }$

$struct Person { name: String, age: u32, } fn main() { let person = Person { name: "rust biggest fan".to_string(), ..Default::default() }; println!("{:?}", person); // Output: Person { name: "rust biggest fan", age: 0 } }$

$#[derive(Default, Debug)] struct Person { name: String, age: u32, } #[derive(Debug)] struct PersonWithCustomDefault { name: String, age: u32, } impl Default for PersonWithCustomDefault { fn default() -> Self { PersonWithCustomDefault { name: "Unknown".to_string(), age: 10 } } } fn main() { let person = Person::default(); println!("{:?}", person); // Output: Person { name: "", age: 0 } let person_with_custom_default = PersonWithCustomDefault::default(); println!("{:?}", person_with_custom_default); // Output: PersonWithCustomDefault { name: "Unknown", age: 10 } }$

$struct Animal { name: String, age: u32, fav_treat: Option<String> } fn print_treat(animal: Animal) { // println!("{} loves {}", animal.name, animal.fav_treat) // This line ^^ wouldn't compile because fav_treat is an Option<String> // and can't be printed directly. Instead lets use a match statement! match &animal.fav_treat { Some(treat) => println!("{} loves {}", animal.name, treat), None => println!("{} doesn't have a favorite treat", animal.name), } }$

$enum TrafficLight { Red, Yellow, Green, } fn get_light_action(light: TrafficLight) -> &'static str { // This match does NOT compile, the compiler says the following: //error[E0004]: non-exhaustive patterns: `TrafficLight::Yellow` not covered match light { TrafficLight::Red => "Stop", TrafficLight::Green => "Go", } }$

$#[derive(Debug, Clone)] struct Person { name: String, age: u32, } fn main() { let alice = Person { name: "Alice".into(), age: 30 }; let mut bob = alice.clone(); bob.name = "Bob".to_string(); dbg!(alice); dbg!(bob); // Outputs: // alice = Person { name: "Alice", age: 30 } // bob = Person { name: "Bob", age: 30 } }$

Screenshot of requests to a new domain for lots of random prefixes, likely by automated bots scanning the certificate transparency logs. Some of the paths include `.DS_Store` `.env` `.git/config` and `/_all_dbs`

$trait Printable { fn print(&self); } struct NewsArticleTitle(String); impl Printable for NewsArticleTitle { fn print(&self) { println!("News Article: {}", self.0); } } struct BlogPostTitle(String); impl Printable for BlogPostTitle { fn print(&self) { println!("Blog Post: {}", self.0); } } fn print_me<P: Printable>(item: P) { item.print(); } fn main() { let article = NewsArticleTitle("Breaking News - Rust is fun!".to_string()); let post = BlogPostTitle("Why I love Rust!".to_string()); print_me(article); print_me(post); } // Outputs: // News Article: Breaking News - Rust is fun! // Blog Post: Why I love Rust!$

$fn fibonacci(n: u64) -> u64 { if n <= 1 { return n; } fibonacci(n - 1) + fibonacci(n - 2) } #[cfg(test)] mod tests { use super::*; #[test] fn test_fibonacci() { assert_eq!(fibonacci(0), 0); assert_eq!(fibonacci(1), 1); assert_eq!(fibonacci(2), 1); assert_eq!(fibonacci(10), 55); } }$