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15 Years of Building Jefit

Embrace the Grind: 15 Years of Building Jefit The Start of Something I Didn't Expect to Last 15 Years Fifteen years ago, Jefit wasn't a company. It wasn't even a business idea. It was just a project I started in my dad's living room in North Carolina, fresh out of college, working from my own laptop. I was broke and unsure about the future, frustrated by how hard it was to track workouts. There was no easy way to stay consistent or see real progress. I wasn't chasing a startup dream, jus

15 Years If Jefit

Embrace the Grind: 15 Years of Building Jefit The Start of Something I Didn't Expect to Last 15 Years Fifteen years ago, Jefit wasn't a company. It wasn't even a business idea. It was just a project I started in my dad's living room in North Carolina, fresh out of college, working from my own laptop. I was broke and unsure about the future, frustrated by how hard it was to track workouts. There was no easy way to stay consistent or see real progress. I wasn't chasing a startup dream, jus

Tilck: A tiny Linux-compatible kernel

What \ Arch i386 riscv64 x86_64 (build) Tests Toolchain debian N/A Toolchain fedora N/A Toolchain archlinux N/A Toolchain openSUSE N/A Contents Overview What is Tilck? Tilck is an educational monolithic kernel designed to be Linux-compatible at binary level. It runs on i686 and RISCV64 at the moment. Project's small-scale and simple design makes it the perfect playground for playing in kernel mode while retaining the ability to compare how the very same usermode bits run on the Linux kernel

Weave (YC W25) is hiring an AI engineer

At Weave, we’re building the best software for the best engineering teams to move faster, and we want to hire exceptional engineers to help us do so. We are a well-funded startup, backed by top investors, growing rapidly and currently profitable. You'll be working directly with me (Andrew), the CTO. Before I was CTO of Weave I was the founding engineer at Causal, and I want to give you all the support and growth opportunities in this role that I got when I went through it. You’ll also be work

How and where will agents ship software?

We’re entering a new phase of software engineering. People are becoming addicted to agents. Beginners are vibe-coding apps and experts are maxing out their LLM subscriptions. This means that a lot more people are going to make a lot more apps, and for that we’re going to need new tools. Today we’re releasing an API that gives you and your agents full-stack backends. Each backend comes with a database, a sync engine, auth tools, file storage, and presence. Agents can use these tools to ship hig

Atopile – Design circuit boards with code

atopile brings the power of software development workflows to hardware design. By describing electronics with code, you can leverage, modularity version control, and deep validation. Capture design intelligence and constraints directly in your code, enabling auto-selection of components, embedded calculations checked on every build, and reliable, configurable modules. This allows for rapid iteration, easier collaboration, and robust designs validated through continuous integration. Quickstart

Tilck: A Tiny Linux-Compatible Kernel

What \ Arch i386 riscv64 x86_64 (build) Tests Toolchain debian N/A Toolchain fedora N/A Toolchain archlinux N/A Toolchain openSUSE N/A Contents Overview What is Tilck? Tilck is an educational monolithic kernel designed to be Linux-compatible at binary level. It runs on i686 and RISCV64 at the moment. Project's small-scale and simple design makes it the perfect playground for playing in kernel mode while retaining the ability to compare how the very same usermode bits run on the Linux kernel

Hazel: A live functional programming environment with typed holes

Hazel Hazel is a live functional-programming environment rooted in the principles of type theory. You can find the relevant papers and more motivation at the Hazel website. You can try Hazel online: the dev branch is the main branch at the moment. Every other branch that has been pushed to GitHub and successfully builds can also be accessed at: https://hazel.org/build/<branch_name> Building and Running Hazel Short version If you already have ocaml version 5.2.0, at least version 2.0 of opa

5 days until TechCrunch All Stage — save up to $475 before prices rise

In just five days, startup leaders from across the country will descend on Boston’s SoWa Power Station for TechCrunch All Stage 2025 — and your chance to lock in the lowest ticket prices will be gone. Whether you’re preparing for your next raise, looking to fine-tune your go-to-market strategy, or building your founding team, TC All Stage is where real startup momentum happens. This is a full-day event packed with actionable sessions, tactical advice, and conversations that push your company fo

Show HN: Virby, a vfkit-based Linux builder for Nix-Darwin

Virby - Linux Builder for Nix-darwin Virby is a module for nix-darwin that configures a lightweight, vfkit-based linux VM as a remote build machine for nix, allowing linux packages to be built on macOS. This project is modeled after nix-rosetta-builder, which provides a similar service, using lima to manage the VM. Some parts of the code in this repository are directly borrowed and adapted from that project. Quick Start Add to your flake and enable: # flake.nix { inputs . virby = { url = "gi

Topics: build nix ssh virby vm

Archaeologists unveil 3,500-year-old city in Peru

Drone footage released by researchers shows a circular structure on a hillside terrace at the city's centre, surrounded by the remains of stone and mud buildings. Eight years of research at the site unearthed 18 structures, including ceremonial temples and residential complexes. In buildings at the site, researchers discovered ceremonial objects, clay sculptures of human and animal figures and necklaces made from beads and seashells. Peñico is situated close to where Caral, recognised as the

Moroccan founder raises $4.2M for her YC-backed startup building the next layer of AI search

As generative AI reshapes industries, one of its most important yet invisible challenges is retrieval, the process of fetching the right data with relevant context from messy knowledge bases. Large language models (LLMs) are only as accurate as the information they can retrieve. That’s where ZeroEntropy wants to make its mark. The San Francisco-based startup, co-founded by CEO Ghita Houir Alami and CTO Nicolas Pipitone, has raised $4.2 million in seed funding to help models retrieve relevant da

Bootstrapping a side project into a profitable seven-figure business

Bootstrapping a side project into a profitable seven-figure business in four years. We really did it! We bootstrapped ProjectionLab to $1,000,000 in annual recurring revenue. And I’m still processing that this is real. 🥹 Back in 2021, I was inspired by the financial independence movement and wanted a better way to plan my own life. I couldn’t find the right tool, so I started building. I had no idea that side project would one day help over 100,000 households plan for their financial future

Why the simplest desktop agent abstraction wins

This is first post in a series about the design and implementation of Bytebot . Give us a star on our open source repo . We’re still in the early innings of AI agents. There are hundreds of companies building wrappers around LLMs, trying to make them more useful; more tool-aware, more stateful, more capable of completing tasks across applications. But most of them are barking up the same tree: they’re building agents that work by connecting APIs and tools in structured ways. Bytebot was born o

A 37-year-old wanting to learn computer science

5 July 2025 Who am I? The title says it. I am a 37-year-old wanting to learn computer science. But who am I really? I am someone who has always wanted to build stuff. I am fascinated by the process of creating anything. And it gives me unbridled pure joy to have people use something I have built in a meaningful and useful way. I am not a complete beginner in computer science. I am still a somewhat-beginner. At least I know how to hack my way to build and host a minimalistic static blog like

Continue (YC S23) is hiring software engineers in San Francisco

Why you should join Continue We believe there is an opportunity to create a future where developers are amplified, not automated. This is why we are enabling developers to create, share, and use custom AI code assistants with our open-source IDE extensions and hub of models, rules, prompts, docs, and other building blocks. Headquartered in San Francisco, Continue (YC S23) is funded by Heavybit and angels like Julien Chaumond (co-founder of Hugging Face), Lisha Li (founder of Rosebud AI), and F

(Experiment) Colocating agent instructions with eng docs

kayce@kayce0 ~/p/pigweed (main)> gemini ███ █████████ ██████████ ██████ ██████ █████ ██████ █████ █████ ░░░███ ███░░░░░███░░███░░░░░█░░██████ ██████ ░░███ ░░██████ ░░███ ░░███ ░░░███ ███ ░░░ ░███ █ ░ ░███░█████░███ ░███ ░███░███ ░███ ░███ ░░░███ ░███ ░██████ ░███░░███ ░███ ░███ ░███░░███░███ ░███ ███░ ░███ █████ ░███░░█ ░███ ░░░ ░███ ░███ ░███ ░░██████ ░███ ███░ ░░███ ░░███ ░███ ░ █ ░███ ░███ ░███ ░███ ░░█████ ░███ ███░ ░░█████████ ██████████ █████ █████ █████ █████ ░░█████ █████ ░░░ ░░░░░░░░░ ░

Wind Knitting Factory

Wind Knitting Factory ‘Wind Knitting Factory’ is a wind powered knitting machine that is attached to the facade of a building. The blades embrace more than a meter in diameter, and the wind that is cached by the mill drives the machine. Like that a long scarf gets knitted along the building downward. When it is windy the machine knits fast and with less wind the machine knits slowly. Buy them here Wind Knitting Factory ‘Wind Knitting Factory’ is a wind powered knitting machine that is attache

TechCrunch All Stage brings back early launch prices for a limited time

We’re almost there, and ticket rates have officially rolled back with savings of up to $425. TechCrunch All Stage, the founder summit of the year, is just around the corner. On July 15, Boston becomes startup central. Are you ready to gain the insights and strategies you need to launch or scale? Now’s the moment For a limited time, we’ve brought back early launch pricing. Founders pay just $155. Investors, only $250. These are the lowest rates you’ll see before the doors open at SoWa Power St

The Hidden Engineering of Liquid Dampers in Skyscrapers

[Note that this article is a transcript of the video embedded above.] There’s a new trend in high-rise building design. Maybe you’ve seen this in your city. The best lots are all taken, so developers are stretching the limits to make use of space that isn’t always ideal for skyscrapers. They’re not necessarily taller than buildings of the past, but they are a lot more slender. “Pencil tower” is the term generally used to describe buildings that have a slenderness ratio of more than around 10 to

Nikita Bier joins X as head of product: ‘I’ve officially posted my way to the top’

In Brief Elon Musk’s X has appointed serial entrepreneur and growth hacker Nikita Bier as its new head of product. “I’ve officially posted my way to the top,” Bier wrote on X, alluding to his large presence on the app. Bier is best known as the founder of apps like Gas, which was acquired by Discord, and TBH, which was acquired by Facebook. Both Gas and TBH were apps geared toward teens, who were encouraged to leave one another compliments. More recently, Bier has been working as a venture p

Nikita Bier joins X as Head of Product: ‘I’ve officially posted my way to the top’

In Brief Elon Musk’s X has appointed serial entrepreneur and growth hacker Nikita Bier as its new Head of Product. “I’ve officially posted my way to the top,” Bier wrote on X, alluding to his large presence on the app. Bier is best known as the founder of apps like Gas, which was acquired by Discord, and TBH, which was acquired by Facebook. Both Gas and TBH were apps geared toward teens, who were encouraged to leave one another compliments. More recently, Bier has been working as a venture p

Next-gen procurement platform Levelpath nabs $55M

Levelpath, a procurement software startup founded by the duo behind Scout RFP, has raised $55 million in Series B funding led by Battery Ventures as the company looks to quadruple its revenue this year. The funding round also saw participation from existing investors, including Benchmark, which led Levelpath’s $14.5 million seed round, and Redpoint, the lead investor in the $30 million Series A round announced in 2023. The startup was founded by Stan Garber and Alex Yakubovich (pictured right)

Building untrusted container images safely at scale

Many SaaS platforms need to run customer code securely and fast. Rather than building container infrastructure from scratch, you can use Depot's API to handle the heavy lifting. Here's how to build Go tooling that creates isolated projects, manages builds, and tracks metrics for your customer workloads. A lot of our customers run into the same problem: they need to run code on behalf of their customers. Whether you're hosting user-generated Python scripts, processing custom containers, or runni

What LLMs Know About Their Users

We need to talk about data integrity. Narrowly, the term refers to ensuring that data isn’t tampered with, either in transit or in storage. Manipulating account balances in bank databases, removing entries from criminal records, and murder by removing notations about allergies from medical records are all integrity attacks. More broadly, integrity refers to ensuring that data is correct and accurate from the point it is collected, through all the ways it is used, modified, transformed, and eve

Reproducible Builds

Process in computer science Logo of the Software Freedom Conservancy's Reproducible Builds project Reproducible builds, also known as deterministic compilation, is a process of compiling software which ensures the resulting binary code can be reproduced. Source code compiled using deterministic compilation will always output the same binary.[1][2][3] Reproducible builds can act as part of a chain of trust;[1] the source code can be signed, and deterministic compilation can prove that the bina

London's largest ancient Roman fresco is “most difficult jigsaw puzzle”

Timelapse of the MOLA specialist team reassembling a section of wall plaster. All images © MOLA (Museum of London Archaeology), shared with permission London’s Largest Ancient Roman Fresco Makes for the ‘World’s Most Difficult Jigsaw Puzzle’ ArtHistory Kate Mothes Share Pin Email Bookmark One of the remarkable things about a city like London, which has been inhabited for nearly 2,000 years, is that no matter where a developer chooses to build, chances are there’s some relic of the past buried

London's Largest Ancient Roman Fresco Is “Most Difficult Jigsaw Puzzle”

Timelapse of the MOLA specialist team reassembling a section of wall plaster. All images © MOLA (Museum of London Archaeology), shared with permission London’s Largest Ancient Roman Fresco Makes for the ‘World’s Most Difficult Jigsaw Puzzle’ ArtHistory Kate Mothes Share Pin Email Bookmark One of the remarkable things about a city like London, which has been inhabited for nearly 2,000 years, is that no matter where a developer chooses to build, chances are there’s some relic of the past buried

Spark AI (YC W24) is hiring a full-stack engineer in SF (founding team)

About Us ⚡️ Join us to accelerate the energy transition with technology. At Spark, we’re building the AI engine behind the next generation of renewable energy infrastructure. Our mission is simple yet ambitious: To help renewable energy developers build solar farms, battery storage plants, and related projects more efficiently. If you’re excited to see your products directly accelerate the energy transition, read on. We’re already powering decision-making for industry leaders like Colliers En