Mara Bos

@mara.bsky.social

5543 Followers 111 Following

Rust dev, Electronics engineer, Author, RustNL, RustWeek organizer, ADHD, Polyamorous, Lesbian, She/Her

$ grep -E MemTotal\|MemAvail /proc/meminfo MemTotal: 263756028 kB MemAvailable: 201759380 kB
The same back side of the unsafe Rust license card, but this time with a new line added in the table: Code F: Unsafe attributes
A plastic id card with "unsafe rust license" written at the top. It shows my picture and a bunch of details: Surname: Bos Given names: Mara Date of birth: 1993-01-01 Issuance date: 2026-06-29 Expiration date: 2036-06-29 Document number: V33192834QC Issued by the Rust Licensing Authority
A slide showing "Unvalued Goose Game - by SoftBank", the goose from untitled goose game "goose value 0?", three golden eggs, and a warning sign with an icon of an egg with "ASI" written on it.
A slice of pizza with the trext "This is a pizza" burned onto the crust in the Papyrus font.
A pink metalic aluminum business card with the Hexcat logo and address on the left, and text on the right: Mara Bos, Managing Director, mara@hexcat.nl
The Rust logo cut out of 3mm plywood. It is sitting on a macbook command key for scale. The logo is only 6mm across, absolutely tiny. Somehow, the details are still very sharp.
The Rust logo cut out of plywood. It is small, just 2 cm across, and the edges are not burnt, somehow.
Handle of a metal knife with the phrase "This is a knife!" engraved on it in comic sans.
An egg with the word "egg" engraved into the shell. The top layer of the shell is gone and the layer below it is visible in those letters. There are no burnmarks or discolorations, somehow.
Sea urchin with short white spikes held in someone's hand.
Cute drawing of Ferris the crab and Corro the Rusturchin. Ferris blinks confidently. Corro ia waving and looks very anxious.
All the speakers, workshop trainers, volunteers, and organizers standing in front of a huge cinema screen. The screen is showing RustWeek 2026, and the subtitles say "yeah. Pictures. Who's got a good camera?"
Black screen displaying in white: RustWeek 2027, Utrecht, Netherlands, 24-29 May 2027. Tickets available NOW!
Still of the credits roll, displaying: Organized by RustNL Director Erik Jonkers Mara Bos Volunteer organizer Laura Pircalaboiu Jana Dönszelmann Terts Diepraam Consultant Josine Kamperman (ONlive) Speakers in order of appeareance Main track Taylor Cramer Waffle Stefan Baumgartner Rose Peck Andreea Costea Cliff L. Biffle the last line is only partially visible, the rest is cut off.
A movie poster for "Jurassic std::thread::park()". Instead of a dinosaur silhouette, it shows the silhouette of Corro. The tagline says "A Deadlock 65 Million Years In The Making."
A movie poster for "Box<impl Future>" in the same style as the the original Back to the Future poster. It shows the back of the DeLorean with license plate "ENOMEM" and the tagline is "1.21 gigabytes".
A poster for "PhantomData of the Opera". It shows a Corro shaped mask and a red rose on a dark background.
A movie poster for "The Day After Release" with tagline "Where Will Your Feature Be?". The text is in the same font as used on the movie poster of The Day After Tomorrow. The background is a huge stormy sea wave.
A movie poster for mem::forget, similar to the movie poster of Memento. It shows a large polaroid with Ferris and a smaller polaroid of Corro holding a smaller polaroid with Ferris again, repeat. The outermost polaroid has "mem::forget" written on it, and on the first smaller one it says "some objects are best forgotten".
A movie poster for "E.T. - The Extern Type". It shows two crab claws touching each other with a light effect coming from the touch. The background is the night sky with a large moon on top of which the shadow of a code snippet of an extern type is visible. The tagline at the top of the poster says "its adventure in Rust".
A movie poster for "28 Errors Later" with tagline "cargo didn't fix anything". It looks like the movie poster for 28 Years Later, but with the skulls replaced by Corro the Unsafe Rusturchin.
A movie poster for "The Lord of the Ring Buffers - The Two Pointers" showing the silhouette of two towers with a sepia colored sky with a large moon in the background.
A movie poster for "Hail Miri" using the same font as the Hail Mary poster, showing a big green planet with a huge Corro (the unsafe rustacean mascot) behind it.
Nine movie posters displayed next to each other.
Many many happy Rustaceans at the 10 years of Rust celebration.
Screenshot of the top of the RustWeek schedule, with a toggle button that allows you to switch between the conference timezone (CEST) and your own timezone (PDT in this example).
Me wearing a yellow RustWeek 2026 badge with my name, organisation (Hexcat), pronouns (she/her), GitHub username and profile picture, and ferris peeking from the bottom edge.
The Language of Empathy by Taylor Cramer Late one night in January 2016, having spent hours in a university lab debugging seemingly intractable C++ bugs, I made the jump to Rust– a language that recognized my struggle. This empathy for the plight of systems programmers made Rust unique then, and it’s what makes the language invaluable now. Empathy is a core design philosophy, a technical constraint, and a primary reason why people love writing Rust. This talk explores the tangible impact empathy has had on our code, tooling, and community. We will break down how this design ethos actively shapes our software and explore practical tools for building more empathetic relationships and more robust systems.
Screenshot of the website, listing the eight team members: Oli (full-time), Waffle (full-time), Tiffany (intern), Mara (part-time), Jana (part-time), Nia (part-time), Bjorn (part-time), and Folkert (part-time).
A picture of one of the canals of beautiful Utrecht, with the Dom church tower in the background, people walking by the shops, and lots of bicycles parked against the railing.
RustWeek volunteers in yellow RustWeek shirts printing out RustWeek badges for RustWeek visitors.
A pie chart showing 1122 wifi clients, with roughtly a fifth Android, another fifth iOs, and smaller chunks for MacOS, Ubuntu, Windows, and other devices.
A restaurant filled with many Rustaceans.
A large cinema room filled with happy Rustaceans at RustWeek 2025.
A pin button making machine and a few rainbow Rust buttons.
Me in a black and white dress with long very pink hair.
Jana operating a button making machine, making a batch of Rust buttons.
A whole pile of pin buttons with the rust logo on top of the progress pride flag.
A snowman made of three big balls of snow. She has leaves as eyes, a carrot as nose, sticks as mouth and arms, and little stones as buttons. She is also wearing my pink winter hat. She looks happy.
A pizza with eight mini pizzas on top.
The source of the standard Rust Hello World program with the generated assembly before and after the change. The before version has 11 instructions and stores 56 bytes on the stack. The after version has 3 instructions and stores no data on the stack.
Tris on stage at Eurorust with a slide displaying "Mara's crimes" in big letters behind him.
A tweet from @CppCon from 22 september 2015: "Herb Sutter says we are close to solving memory safety in C++ without runtime overhead. #CppCon"
A round dinner table with six matching plates and bowls, each in a different color of the rainbow. In the middle is a pot of (bell pepper) soup and a big lasagne dish.
A screen displaying Memtest86+ with a list of failed memory addresses.
The "V for Vendetta" movie poster, but with new text. The title is now "V for VecDeque". In the background, it says "For loops! Forever!"
The movie poster of Ferris Bueller's Day Off, but instead of Ferris Bueller it shows Ferris the Rustacean wearing sunglasses. The title is now "Ferris' Day Off".
The movie poster of "Jaws", but with the shark replaced by a large crab claw. The title now says "Claws". At the very top, it reads "from the No. 1 Rust conference."
The movie poster of "The Silence of the Lambs" but with some edits: The butterfly is replaced by a crab, and the title has been changed to "The Silence of the Lambdas". The tagline reads "from the terrifying Rust conference".
A movie poster. At the very top, it reads: "The Return of the Great Memory Leak." Below that: "Raiders of the Lost Arc<_>" in the same style as on the original movie poster. Ferris appears below with a whip in its claw. Corro appears in the background.
The movie poster of "A Fish Called Wanda", but with the title changed to "A Turbo Fish Called Wanda". The fish in the bowl has been changed to a 'turbo fish': two colons followed by the less-than and great-than signs.
The movie poster of "Jurassic Park", but the title has been replaced by "Jurassic std::thread::park()". Instead of a dinosaur, the silhoutte in the logo is of Corro the Unsafe Urchin. Below the logo, it says: "A Deadlock, 65 Million Years In The Making".
A movie poster similar to that of "The Incredibles", but with the title changed to "The Immutables".
The "Back to the Future" movie poster, but with the title replaced by "Box<impl Future>". On top it says "1.21 gigabytes". The license plate of the DeLorean reads "ENOMEM".
The fully automated EnterPresser™ 3000: A big red button on a messy desk full of wires activates a solenoid pressing the enter key of a laptop. The solenoid is held in a vice which is attached to the laptop. A lab power suply set to 12.00 volt in the background powers it. Someone is laughing in the backgound.
An easyJet airplane in the gray sky.
A pidgeon flying in the air with its wings spread wide.
A pidgeon on a concrete ledge with one of its feet slightly lifted up.