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Ask HN: What are you working on? (September 2025)

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Re: Ask HN: What are you working on? (September 2025)

#791

Post by conductr »

stevepotter wrote: post #663
mentos wrote: post #620

Earlier quoted context omitted.

Curious if you’ve heard of OssoVR and what your honest assessment of VR training in your field is?

VR training hasn't really stuck in ortho training. It's legit and people do it, but it's a distant second to doing it live. I haven't seen that much of it, but from what I have seen, the fidelity is quite low. It would be cool to see what a good game studio could produce. Doctors, like most people, don't like stuff on their head. Plus in ortho there is a lot of feel to it. It's often referred to as "carpentry". The d…

Used to work for a major implant company, we had a cadaver lab at company headquarters and flew in doctors for training. The rep in the OR is mostly just for support. They carry in a bunch of hardware in case the doctor needs to pivot midway through, they may need different sized screws or something. They can show doctors how the device is meant to connect together without bone/tissue but they often have little to no medical training, they are sales representatives.

Re: Ask HN: What are you working on? (September 2025)

#792

Post by ddahlen »

nhatcher wrote: post #603
ddahlen wrote: post #550

Working on orbital dynamics code for my PhD in astronomy, written in rust, it can accurately calculate the positions of all asteroids/comets to within a few meters. Today I am adding a new numerical integration method which should enable me to predict orbits from observations. https://github.com/dahlend/kete I'm working on modeling the motion of observed dust particles coming off of comet 67P, here is are some exampl…

Hi, this looks amazing! Can't wait to check it out properly tonight. What are you using for numerical integration? I did this last month: https://www.nhatcher.com/three-body-periodic/ https://github.com/nhatcher/three-body-periodic There are a couple of half baked integrators there :)

Its an implementation of a pretty standard integrator used by astronomers informally called "RADAU", but it is not exactly the same RADAU you would find elsewhere. Basically it is about as good as you can typically get for multi-step integrators, tuned for speed not precision though.

Note that how the code is laid out you cant really simulate non-solar system masses. Its really aimed at massless objects in the solar system, your 3-body simulations are actually quite difficult to do given the design.

Re: Ask HN: What are you working on? (September 2025)

#793

Post by gengstrand »

I am currently building a lot of AI models for predicting both individual athlete and team based performance for https://www.higherscoresdfs.com/dfs/spa/welcome/

Like the rest of online mass media, HN covers generative AI a lot but there is still plenty of value in predictive AI. Both forms provide plenty of technical challenges to the AI engineer. I miss the days when you could get a stack trace to when debugging an issue.

Re: Ask HN: What are you working on? (September 2025)

#796

Post by siim »

I'm working on https://X11.Social, a voice-first content creation tool for X.

The initial idea was "call to tweet", the ability to compose posts on the go by having a natural conversation with an AI assistant over a simple phone call. This is useful for turning thoughts from a walk or drive into a polished "brain dump" post, or for engaging with user lists without being at a computer.

It has since evolved into a broader system:

Chrome Extension: A context-aware assistant that lives in the browser. It has a Quake-style console (activated by opt+space) for quick chat and can analyze the content of any page you're on (e.g., YouTube transcripts, articles, other tweets) to help you create relevant content.

Engagement Predictor: A feature that scores tweet drafts in real-time to predict their potential for engagement. It's built on a model trained on my own dataset pulled from the X API and other public dataset from Kaggle[0].

Scheduled AI Calls: The system can call you on a predefined schedule to proactively brainstorm content ideas.

Here is the tech stack:

- Frontend: React, Tailwind, shadcn/ui

- Auth: X OAuth

- Payments: Stripe Subscriptions

- Voice AI: ElevenLabs Conversational AI, Twilio

- Engagement Predictor ML: Python, scikit-learn, XGBoost on a data pipeline from X API v2 and a base dataset from Kaggle.

- Chrome Extension: Same as Frontend and Chrome Extensions API

- Blog: Jekyll

- Infrastructure: Deployed on AWS Fargate using AWS Copilot for orchestration (ECS).

I'm building solo and just got the first trial user after 87 days of building in public. It's a long road but the feedback so far is encouraging.

[0] https://www.kaggle.com/code/shpatrickguo/tweet-virality-pred...

Re: Ask HN: What are you working on? (September 2025)

#797

Post by sgt »

vldszn wrote: post #207

I built a free & open-source invoice generator: https://easyinvoicepdf.com/?template=stripe - No sign-up, works entirely in-browser - Live PDF preview + instant download - VAT support (EU-friendly) - Shareable invoice links - Multi-language (10+) & multi-currency - Multiple templates (incl. Stripe-style) - Mobile-friendly GitHub: https://github.com/VladSez/easy-invoice-pdf Would love feedback, contributions, or ideas…

How are you planning to generate revenue? My concern will fully free services is that they often don't exist after 3-4 years. Then I have to find another invoice generator. Sticking to WaveApps for now, but this is looking great actually and I'd consider using it.

Re: Ask HN: What are you working on? (September 2025)

#798

Post by cosmicgadget »

kilroy123 wrote: post #84

I started a newsletter that tries to recreate the original magic of stumble upon. To feature cool random stuff from across the internet. I believe the old internet is still alive and well. It's just buried under a mountain of shit. https://randomdailyurls.com/

Nearbywiki is a really neat find. Thank you for doing this.

Re: Ask HN: What are you working on? (September 2025)

#799

Post by imedadel »

Linear-inspired wiki:

https://outcrop.app

I've been working on Outcrop full-time for a few months now, since I left my job at Stripe. I think knowledge base systems are some of the most important components for successful companies. Current tools are too slow and too messy. Many companies end up developing a custom internal wiki to supplement their Confluence one.

Outcrop is powered by custom search, collaboration, and authorisation engines. Everything is indexed, including comments. Search and navigation are instant. I have a long list of itches I want to scratch with this product. I'm doing a round of private previews to collect feedback, if you're interested, please sign up, I'd love to talk you!

Re: Ask HN: What are you working on? (September 2025)

#800

Post by cosmicgadget »

davidw wrote: post #295

Trying to re-legalize "neighborhood commercial" by right in the city I live in. Things like corner stores or small barber shops or coffee shops or converted restaurants. ACUs or Accessory Commercial Units, home conversions... different ways of doing it.

Any chance you've documented your experiences?
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