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- I’m working on an open cave registry for the Western Tatra Mountains.
The Tatras may look solid from the outside, but our mountains are hollow inside - and there is still a lot to discover. The project brings together cave survey data, entrances, maps, and terrain models into one open spatial dataset.
3D model: https://dlubom.github.io/Jaskiniowy-Kataster-Tatr-Zachodnich...
Repo: https://github.com/dlubom/Jaskiniowy-Kataster-Tatr-Zachodnic...
Feedback is welcome, especially from people interested in cave mapping, GIS, open scientific datasets, or underground worlds in general.
by dlubom - This is the first year I made more money selling art than I did freelancing web dev. I just incorporated and formalized my web dev business (https://lcdbmg.com). A couple of weeks later I got a booth at an art festival and ended up selling many prints (https://lucidbeaming.com). I think the universe is telling me something.by ogou
- Hey, that's awesome! Very nice work and a really good portfolio site.
How did you find the festival-booth experience?
by biztos - congrats! I wish I could make a living of art again, music production in my case.
Because being a dev in 2026 is becoming unbearable.
- I'm finally fulfilling a childhood dream of restoring a Heathkit oscilloscope. I managed to nab a functioning IO-12 at the thrift store for $75!
Don't tell my husband that I spent more than $200 on parts and supplies for it.
I've wanted a Heathkit since I learned about them as a teenager, and this is the first one I've ever seen in the wild. The original owner left the date he assembled it and his callsign written on the inside! I looked him up and he died in 2013, but by sheer happenstance I'm restoring it 58 years to the day that he initially built it. I got super lucky with this unit because as far as I can tell, it's only been run a few hours in its entire life. I really only have to replace aged components because they're physically breaking down, I expect the thing will outlive me once I'm done with it. Can't wait to hand it off to a bewildered young EE in another half century.
by vitally3643 - This is really cool! My dad always talked about the one he had when he was much younger.
In a similar vein I’m teaching my son to rebuild an old ‘62 VW that’s been in the family since ‘62 and am constantly reminded of how nice it is when things are simple. And I’ve learned that the dollars spent are not that important when you are having fun and learning or teaching something!
by soysamurai - $275 to restore a long-held childhood dream is cheap, I hope your husband wouldn't complain about that.by RagnarD
- After getting the top spot in What Are You Working On in Feb 2025 ( https://news.ycombinator.com/item?id=43157056 ) I started a company on that idea at https://getcomper.ai . After solo building for 11 months I found a co-founder, got an angel investment, then got some ex-Miro folk on board and we are now building the product at breakneck speed.
We're a collaborative canvas + context engine for all the code and docs in your company, with a zoomable UI + CLI , where you can collaborate with your co-workers and agents.
We map technical debt, agent readiness, code complexity, security scanning, bus factor and more, so you can easily see how all the software in your company runs.
One of the most complex things is our incremental git blame engine built on top of GitOxide, as our backend is fully built on Rust. Our frontend is built on PixiJS so you can explore at gaming speed with 60Hz refresh rates.
Recently we sponsored Rust Week in Europe and a hundred or so developers tried our mini-game which is GeoGuessr for code, and got rave reviews. Future is looking bright!
by jtwaleson - Are you doing a bespoke canvas engine or using tldraw/excalidraw?by aleda145
- This looks super cool. I even upvoted your last year's post. Great to see you have come so far ahead. Any chance you are hiring? I have 3 years of exp building software especially 0-1s. I specialize in backend and currently working as a Product Engineer at a Series C startup leading their 0-1 AI initiatives.by ayushpawar
- That's a pretty neat idea. What does "map technical debt, agent readiness, code complexity" look like? How does that get done?by 8bitsout
- My wife and I are working on a math/science/CS-inspired jewelry business.
We try to create pieces that stand on their own aesthetically but have a hidden meaning. We currently have two styles: lambda calculus based pieces (we depict the lambda/Tromp diagram) where we have Y-Combinator earrings (well, strictly speaking they are one beta reduction away from Y-combinator. Aesthetic oblige) and a pendant depicting a lambda expression computing Graham's number. The other style is quantum computing circuits, based on quantum computing research my brother (a physics professor) is doing: a pendant that is actually a non-local controlled-NOT gate.
I wrote a tiny DSL to describe the jewelry pieces, and an interpreter to produce CAD files. We then either 3D print them or have them produced by lost-wax.
We are 200% out of our comfort zone (and love it): I know nothing of front end dev, payments, or anything like that. The diamond district in New York is a neighborhood we normally actively avoid, but if you are forced to go there it is fascinating (people examining diamonds on the corner of the street, others in fur coats in summer straight out of a mafia movie...), and especial marketing. Jewelry is a completely saturated business (luckily we are not doing this to pay the rent); we think we have a unique angle, but we are still figuring out the target audience (if there is one).
Store: https://studio-galois.com/
- would love to see some Fibonacci ear ringsby robofanatic
- Cool! Reminds me of these: https://store.madewithmolecules.com/by kmoser
- Still plugging away at Breaka Club, where kids take photos of their hand drawn art and build games using it. Starts out as no-code, photograph an AprilTag and it imbues the image with functionality.
https://breaka.club/blog/why-were-building-clubs-for-kids
We also teach kids visual scripting in Overcooked 2!, allowing kids to code their way through the levels of an existing much beloved game:
I'm running an in school pilot this week (Lunch time school club).
The tech stack for the main product is honestly pretty intense at this point with full multiplayer support, offline play, transitioning from client authoritative to joining a remote server. Built atop GodotJS, TypeScript bindings for Godot, which I maintain. Huge monorepo with over a million lines (yes, I'm aware that's NOT a good thing), and GodotJS itself is not included in that.
- super nice!by m00dy
- This is super cool! Nice work!by paulhebert
- This is cool. Sent you a connection request on LinkedIn :)by ccvannorman
- I am making Cargo for C. I have 3/4 of a working demo; the tool can build itself, including some non-trivial dependencies which I've ported to build natively with the tool (instead of wrapping their Make or CMake or whatever).
The pitch: It's insane that we have to pull in Python or Lua to build C code. CMake is an abomination against god that has become usable in spite of itself. Zig cc is proof that this entire ecosystem is an embarrassment. My tool gives C projects a TOML manifest, and builds scripts written in C and JIT compiled by the tool. Now, you can write build scripts in the language itself, pull in dependencies you wanted to use anyway.
It also provides a stable ABI. There's an HTTP-backed index and a Git-backed index. And it generally does the same thing for C that, say, Bun did for JS/TS. You'll be able to run C files from source and have the entire ecosystem available. You'll be able to trivially generate single file static binaries, or dynamically link to an older glibc without arcane tricks. It will fix C.
I'm also still working on my "what if we wrote a real standard library for C"; I added some feedback I got from the release.
by dboon - Have you heard of Conan by chance?
- I'm working on Hiring Method (https://hiring-method.com).
After 1.5 years of development and two exhausting pivots, I’m incredibly happy to finally have our v1 live!
While most of the HR tech is rushing to use black-box AI, I built the exact opposite. It's a transparent, math-driven fitness engine. It extracts objective data from CVs and calculates how well applicants match requirements, letting you see the reasoning behind why someone scored an X%.
If anyone here builds in the HR space or regularly hires engineers, I would absolutely love your feedback or a roast of the landing page.
PS This is a project of immense importance for me, I've been working on for past ~2 years, I'd appreciate to know why this comment is flagged.
by genekrapivin - flags or downvotes probably come from people being skeptical about automated CV evaluation. in europe this is also legally questionable.
also matching requirements should be secondary to experience. someone who has done a few react websites will not be as qualified for your react job as someone that has done 10 years of angular and vue and can learn react in a short time.
by em-bee - Interesting, but given an easy access to AI, employers would get hundreds if not thousands of wonderfully written, properly suited CV. And everyone will have cool Github portfolio (with AI-generated projects). Good luck finding the right person in such environment.
So I am wondering what kind of tooling would be able to somehow spot the right people among flood of AI slops.
by piokoch - I sort of wish employers would use this and also the applicants could see the metric. How much time would be saved if neither side bothered with bad fits?by bee_rider
- As someone who worked on HR Tech in 2024-2025, I think you're really solving a problem here. Cat is out of the bag already it's not like HR can go back to the pre-AI world ... I'm also puzzled by the flags. Congrats on your project :)
I like the landing page.
by phaser - Everyone is building scoring with AI and everyone is providing clues like: These are the 5 things we will score each candidate on, and here is how the candidates scored against each item. And here is the total score because of it.
P.S I work in an hrtech company.
by agup792 - For a while a "cv2vec" lingered in my mind, but abandoned it due to the sheer volume of PII I'd need.
How do you deal with CVs like mine that refuse to list every <fancy keyword> I'm familiar with because it's pointless clutter? In that sense, and IME, the companies that only hire perfect fits are, more often than not, toxic.
by fer - I'm curious how you're addressing any legal aspects about this:
> No black-box AI. Every candidate gets a detailed match receipt explaining exactly why they scored an 85%, complete with contextual evidence from their CV.
HR teams like to play dead when they actually have a file with detailed feedback on a candidate. Yet, they choose to keep that to themselves out of baseless legal fear. I wonder how that works out when somebody proves a company's filter consistently proves a specific bias gets rejected systematically.
and
> Automated assignment validation
which is particularly troubling for devs: companies scaling assignments as first screen. How do you get around "AI evaluating AI" loops especially about assignments ?
by code51 - Been learning electronic PCB design the last few weeks while retrofitting some IKEA window shades for Zigbee enabled motorization.
I've really enjoyed the journey of 3D printing and being able to create all kinds of mechanically useful things over the last few years, but I had always wanted to go even further and incorporate some non-trivial custom electronics.
For this project I had a space constraint for the motor controller board, so while I could have probably hacked together a working perfboard, it just wasn't going to be satisfying. So I finally took the plunge and spent 40 or so hours in KiCad learning how read IC reference documents, picking components, and of course, doing the PCB trace layout.
It's really just a 12v→5v buck circuit, all the plumbing and ancillary components for connecting a ESP32 module to a couple motor driver ICs, and some headers, but it is completely mine!
Just got 5 of my boards in the mail from JLCPCB the other day (insane turnaround, less than a week) and was very happy to find that the entire circuit worked perfectly! I did spend a fair amount of time going over the design with Claude though, so I think that paid off (the kicad files are plaintext, so it made easy work of understanding what I was doing).
Still putting together the repo here, but I'm hoping to make a little blog post out of the project too :) https://github.com/evanpurkhiser/HOPPVALS-MRF-01
- Looks much better than a typical beginner, congrats. As someone with a bit of experience (and a degree) I'd just suggest that you avoid breaking up the ground plane so much. It's the single most important rule for PCB design. Traces on that side should only be short links to jump around a trace on the top side, where possible. It matters the most for SMPS, RF, etc.