Directory

Companies tracked by Rails Radar

Hiring signals with observed stack evidence. Showing 673–720 of 1439 · page 15 of 30.

• Kairo 0 open listings

  discussion=https://news.ycombinator.com/item?id=49691112, title=Show HN: Kairo – Fail-closed LLM inference routing from RTX 5090 measurements

• KaozKit 0 open listings

  discussion=https://news.ycombinator.com/item?id=49712640, title=Show HN: KaozKit – JavaScript LLM agents on an engine built for microcontrollers

• Karen 0 open listings

  discussion=https://news.ycombinator.com/item?id=49708800, title=Show HN: Karen – app feedback as easy as complaining

• Kario 0 open listings

  discussion=https://news.ycombinator.com/item?id=49702066, title=Show HN: Kario – AI Native Motion Graphics Editor, Hey HN, I built https://karioai.com , a web editor for creating motion graphics videos, whilst letting you perfect tiny details like easing. My thesis is that since design is an art, collaborating with the AI on the same canvas instead of outsourcing the entire design to it provides a great balance between creativity and speed. I created this sample video (inspired by Linear) in Kario to explain how it works: https://www.karioai.com/share/6uHru-GZmA?export=JO0aFTKeDT Happy to chat about the AI or dev stack behind the product. Let me know if you have any questions/comments/feature requests!

• Karmit 0 open listings

  discussion=https://news.ycombinator.com/item?id=49707433, title=Show HN: Karmit – Watch Reddit, grow your karma

• KeepUp 0 open listings

  discussion=https://news.ycombinator.com/item?id=49642756, title=Show HN: KeepUp – Verified net worth rankings for everyone, Solo founder here. I built this because of a question I couldn't answer anywhere: Forbes tells me exactly what the ~3000 richest people are worth, but there's no ranking for the rest of us. Not way to compare myself with normal people. Everyone privately wonders if they're ahead or behind; the only available answers are self-reported Reddit threads, national statistics and lifestyle comparisons (which reflect income more than wealth). What it does: you connect your accounts via Plaid (or add assets manually), your net worth is computed from verified balances, and you land on a global leaderboard under a pseudonym with your rank and percentile. Ranks are visible as well as net worth amounts, and the leaderboard is only visible to other KeepUp users — nobody outside can see you. Users where >80% of their assets come from connected sources are considered “verified” and get a public blue checkmark. There’s also what I consider a very well-functioning personal dashboard to track all your wealth, but the leaderboard feature is the novel idea here. Security and privacy is my #1 priority. The architecture is built to ensure no personally identifiable information (PII) is ever stored on our servers (date of birth, email, full name, address, etc.). Only your username is stored, which during sign-up is asked to not be identifying. We also make sure no one on the leaderboard can be identified using K-Anonymity on all quasi-attributes (country, asset classes, age bracket). This is important since the combination of a small number of quasi-attributes can quickly identify someone (famous example: combination of ZIP code, birth year and gender can uniquely identify 87% of US population). The obvious question is "why would I connect my bank to a solo founder's app": access is read-only through Plaid's OAuth flow, your bank credentials never touch the servers, I can see balances but can't move anything, and you can delete everything anytime. Business model, stated plainly: while the leaderboard is free forever, there’s a Pro tier for power users. But, more interestingly, I am working on a financial services marketplace where institutions compete for users who opt in. You stay anonymous, but your wealth is verified, so institutions can bid for your business without knowing who you are. I don't sell data: the thesis is that verified wealth data is valuable enough that you should be the one monetizing it. The thing I'd genuinely like this crowd's help with: how would you game the leaderboard? Manual entries are allowed and shown on the leaderboard, but only connected accounts qualify your account to be “verified”. But even so, margin loans, business accounts, etc. can be used to “cheat” your way up the leaderboard (liabilities can also be connected but is not enforced obviously).

• Kepil 0 open listings

  discussion=https://news.ycombinator.com/item?id=49692366, title=Show HN: Kepil – passport, mandate and tamper-evident journal for AI agents

• Kern Agent 0 open listings

  discussion=https://news.ycombinator.com/item?id=49652648, title=Show HN: Kern Agent – See inside your agent's brain

• Keychron macOS Battery Life and Controls 0 open listings

  discussion=https://news.ycombinator.com/item?id=49663019, title=Show HN: Keychron macOS Battery Life and Controls, I was struggling with getting this working as there's no official support for reporting battery life via bluetooth and via cable. It took a bit of trial and error - but there's a working menu bar item, a control center command, works with the desktop widget (where you'd see airpods, mouse etc), and you can control lighting with it! Hopefully it helps someone :) A lot of credit goes to claude code and Keychron for having open source firmware. This was tested with K10 Pro.

• Keyfence is a local proxy that stops secrets from reaching LLM APIs 0 open listings

  discussion=https://news.ycombinator.com/item?id=49615382, title=Show HN: Keyfence is a local proxy that stops secrets from reaching LLM APIs

• Kibble 0 open listings

  discussion=https://news.ycombinator.com/item?id=49687860, title=Show HN: Kibble – a reader for AI news, tutorials, code and models

• Kickstarter 0 open listings

  article=https://thoughtbot.com/blog/48-companies-you-didn-t-know-were-using-rails-in-2026, website=https://www.kickstarter.com, ruby_jobs=0

• Kin 0 open listings

  discussion=https://news.ycombinator.com/item?id=49636442, title=Show HN: Kin – A code repository built for AI and the people working with it

• Kinesis 0 open listings

  discussion=https://news.ycombinator.com/item?id=49695408, title=Show HN: Kinesis – Control your Mac with the Meta Neural Band, a couple hours ago i had astra take on a 10 month old repo of mine https://github.com/callbacked/neural-band-poc/ that involved finding a way to use the meta neural band independently from the glasses to read the sEMG data off of it. i really think it is a cool piece of technology that largely gets overlooked by the glasses, and always thought it was a shame it couldn't be used outside of its main application. after making quick work of that, i wanted to use it to control my mac using gesture controls and that's how kinesis was born. it has been very cool being able to swipe from desktops using my fingers, swiping up to open up mission control or controlling a virtual knob to adjust my volume. i definitely havent scratched the surface with the neural band but it has been a really fun endeavor thus far! i really hope others can find creative uses for their neural bands too :) note: i really hope this works on other bands because the sample size has just been me so far.

• Kival 0 open listings

  discussion=https://news.ycombinator.com/item?id=49724109, title=Show HN: Kival – A self-hosted knowledge system for organizations, Hi HN, I’ve been building Kival, an open-source, self-hosted knowledge system for organizations. The idea is a collaborative knowledge space for teams and agents, where each contribution to the shared knowledge can meaningfully improve the output of their next tasks. It’s written in Rust, backed by PostgreSQL, and ships with a web app, CLI, and SDKs. Still early, so I’d really appreciate any feedback :)

• KiwiDesk 0 open listings

  discussion=https://news.ycombinator.com/item?id=49729211, title=Show HN: KiwiDesk – Tiling that feels like it shipped with macOS, Hi HN, I'm Maikel, a solo dev from Germany. I've been building KiwiDesk, a tiling window manager which feels like it shipped with macOS. I love tiling window managers, but I couldn't recommend any of them to friends who don't use a terminal. They always felt like a nerd's toy. So I built the one I wanted. Native Swift with a real settings GUI; it needs the Accessibility permission and nothing else, no SIP off.

• Knecht, a tool for building software factories for agencies 0 open listings

  discussion=https://news.ycombinator.com/item?id=49709714, title=Show HN: Knecht, a tool for building software factories for agencies, An agent that only reads and writes code is guessing whether its changes work. To maintain many projects I need one that can boot the app, run migrations, hit the page and read the actual error. So I built Knecht. A Self-hostable tool. You connect your GitHub repos and it starts each project in an isolated Docker sandbox, generated with DDEV. Inside, an agent can do what a developer does locally. Reproduce a bug, run migrations, open the page in the browser etc. Workflows can be started by triggers (Jira tickets, GitHub issues, PRs..) and can run across all projects at once, mixing AI agent steps with deterministic steps, similar to n8n. Knecht is in beta and I am looking for people who maintain many projects. Works best with DDEV projects. https://github.com/knecht-works/knecht-cloud https://knecht.works/updates/beta-tester

• Know Which Pull Request to Review Next 0 open listings

  discussion=https://news.ycombinator.com/item?id=49716838, title=Show HN: Know Which Pull Request to Review Next

• KnowMeNot 0 open listings

  discussion=https://news.ycombinator.com/item?id=49661188, title=Show HN: KnowMeNot – your ChatGPT vs. a ChatGPT that has never met you

• Knowhere-Rebuilds the document structure that chunking throws away 0 open listings

  discussion=https://news.ycombinator.com/item?id=49738595, title=Show HN: Knowhere-Rebuilds the document structure that chunking throws away

• Knowtex Hiring 1 open listing

  employer=Knowtex, profile=https://www.ycombinator.com/companies/knowtex, article=https://thoughtbot.com/blog/48-companies-you-didn-t-know-were-using-rails-in-2026, source=https://www.ycombinator.com/, ruby_jobs=1, titles=ML Engineer: Speech & LLMs

• Kobra 0 open listings

  discussion=https://news.ycombinator.com/item?id=49715737, title=Show HN: Kobra – a Shadcn alternative focused on design quality, I feel like especially post-AI, most agents default to the same Next.js / Tailwind / shadcn stack. It’s great for getting something working fast, but the end result often looks and feels the same and has almost become synonymous with AI slop atp. And when your landing page looks like it was one-shotted at 2am, ppl will assume that quality translates over to your product too. Kobra is my attempt at fixing that, it's a 1:1 replacement for shadcn/ui and also uses the new shadcn/lint library to help your agents maintain consistency. Heavy emphasis on stronger visual defaults and delightful interactions w/ motion.

• Koinly 1 open listing

  url=https://careers.koinly.io/jobs, title=Backend Staff Engineer, research=Wymagania: staff-level backend z własnością data platformy (ingest, normalizacja i rekoncyliacja danych on-chain w skali); mocne SQL; budowa i skalowanie systemów rozproszonych. Koinly to historycznie sklep Ruby/Rails (agregatory pokazują tam też rolę 'Tech Lead | Ruby + Rails'); dokładnych must-have nie widać bez wejścia na stronę.

• Korean filings with minute-level receipt times, and what happened next 0 open listings

  discussion=https://news.ycombinator.com/item?id=49621155, title=Show HN: Korean filings with minute-level receipt times, and what happened next

• Korva turns podcasts into insight cards you can revisit and share 0 open listings

  discussion=https://news.ycombinator.com/item?id=49659996, title=Show HN: Korva turns podcasts into insight cards you can revisit and share, Hi HN, I'm Michael. I built Korva because I listen to a lot of podcasts but forget the things I want to remember. While I'm listening, I think to myself, "I should remember this," but then I can't tell you what it was five minutes after the episode ends. Korva pulls out the ideas and insights from podcasts and puts them in a feed you can explore. You can come back to ideas from your own podcasts, share them, discover what other people are learning, and go deeper on something that interests you. I'm just starting distribution and would love to get Korva in the hands of more podcast listeners. Give it a try and tell me what you think! I'm especially interested in whether it finds the things you wanted to remember and whether you find yourself coming back. Feedback would help me more than anything right now.

• Kosmic Kart 0 open listings

  discussion=https://news.ycombinator.com/item?id=49733578, title=Show HN: Kosmic Kart – Mario Kart-style racing with friends in the browser

• Kreditz 0 open listings

  url=https://careers.kreditz.com/, title=33 (their site, 3 days ago), matching_tags=Rails,Ruby, description=...itHub Actions|gRPC|MySQL|NumPy|OpenAPI|OpenTelemetry|Pandas|PostgreSQL|Power BI|Rails|Redis|Redshift|Ruby|scikit-learn|Serverless|Snowflake

• LLM Attention Visualization 0 open listings

  discussion=https://news.ycombinator.com/item?id=49613068, title=Show HN: LLM Attention Visualization

• LM-Kit One 0 open listings

  discussion=https://news.ycombinator.com/item?id=49710060, title=Show HN: LM-Kit One – private AI on your infrastructure

• LOL Bench 0 open listings

  discussion=https://news.ycombinator.com/item?id=49649243, title=Show HN: LOL Bench – a benchmark for whether LLMs get jokes

• Lab 0 open listings

  discussion=https://news.ycombinator.com/item?id=49675987, title=Show HN: Lab – Local-first, serverless browser client for LLMs

• LaunchPad 0 open listings

  discussion=https://news.ycombinator.com/item?id=49723123, title=Show HN: LaunchPad – I built a Launchpad to replace macOS Apps, Download URL: https://api.ihave.website/launchpad/download/macos I built a Mac app "LaunchPad", I has familiar Apple's Launchpad experience. Smooth trackpad gestures, and my LaunchPad is much more good to look. macOS's "Apps" can't organized App manually, it shipped with A-Z sort. in LaunchPad you can rearrange the apps as usual. And all features are free to try with no time limit. An optional one-time purchase license will be available later.

• LaunchPad-Lite 0 open listings

  discussion=https://news.ycombinator.com/item?id=49729694, title=Show HN: LaunchPad-Lite – Open-Source Next.js 15 with Better Auth and Drizzle

• LazyReader 0 open listings

  discussion=https://news.ycombinator.com/item?id=49620251, title=Show HN: LazyReader – Read ebooks and stream audiobooks directly from your cloud, I built LazyReader because I was tired of re-importing the same ebook library whenever I switched devices or reading apps. Most reading apps copy your books into their own storage. LazyReader connects directly to your existing cloud storage, so your books stay where they already are. It supports Dropbox, OneDrive, and Nextcloud. You can browse your library and read EPUBs directly from the cloud, and it now also supports streaming audiobooks directly from cloud storage. So if you have a 1GB M4B audiobook, you don't need to download the entire file to your phone before listening. Since the original version, LazyReader has grown into a much more complete reading app: - EPUB and audiobook support

• LeagueOfLegends Voice Assistant and Context 0 open listings

  discussion=https://news.ycombinator.com/item?id=49664619, title=Show HN: LeagueOfLegends Voice Assistant and Context, Hi everyone I scraped LoL tutorials from web as context; the rest is LangChain and Anthropic! Context: https://github.com/sorena-ai/LeagueAiCoach/tree/main/data I would really appreciate your feedback, or an upvote if it's still free :)

• Learn CRISPR in 3D in any language 0 open listings

  discussion=https://news.ycombinator.com/item?id=49704763, title=Show HN: Learn CRISPR in 3D in any language, Well, just 12 languages for now. Let me know if you want me to localize it for your language! Hi I'm the creator of 10k Science, an immersive science learning platform where you can zoom into things down to the molecular level, guided via a socratic-style AI on the web, iOS, or VR. iOS: https://apps.apple.com/us/app/10k-science/id6793177913 Meta Quest: https://vr.meta.me/s/287GU4fsKGD3Cl3 Built using real science data, funded by the NSF and NIH.

• Learn Claude Code 0 open listings

  discussion=https://news.ycombinator.com/item?id=49733761, title=Show HN: Learn Claude Code – Interactive Mindmap

• Learn programming by building something you want 0 open listings

  discussion=https://news.ycombinator.com/item?id=49651917, title=Show HN: Learn programming by building something you want

• Legion Hiring 1 open listing

  url=https://weworkremotely.com/remote-jobs/legion-chief-architect, title=Chief Architect

• Lemon.io Hiring 10 open listings

  url=https://remotive.com/remote-jobs/software-development/senior-react-full-stack-developer-2091101, title=Senior React Full-stack Developer, matching_tags=ruby/rails, description=..., React & Python, React & Golang, Golang, React & Java, React & Ruby, Ruby, PHP & Vue, Vue & Node.js, React & .NET, Android & iOS, iOS & Swift, Flutter & Firebase, Solutions Engineer, Blockchain (Ethe...

• Leo 0 open listings

  discussion=https://news.ycombinator.com/item?id=49714211, title=Show HN: Leo – a Markdown engineering process for AI coding agents

• LeoTabs 0 open listings

  discussion=https://news.ycombinator.com/item?id=49659543, title=Show HN: LeoTabs – A high-performance, all-in-one tab manager and switcher

• Let agent read files with secrets while redacting values for LLM contex 0 open listings

  discussion=https://news.ycombinator.com/item?id=49713034, title=Show HN: Let agent read files with secrets while redacting values for LLM contex

• Let coding agents work across your laptop, remote machines, and S3 0 open listings

  discussion=https://news.ycombinator.com/item?id=49647368, title=Show HN: Let coding agents work across your laptop, remote machines, and S3, I wanted to use Codex on my laptop to run kernel optimization experiments on my GPU box, with models stored in S3. That meant having Codex figure out file transfers and remote execution just to get an experiment running. Lots of opportunities to get something wrong before touching the actual kernel. Then what happens in the next session? Either Codex figures it out again, or the previous session leaves behind scripts and instructions. That works, but now there's a small infrastructure project to maintain along with the actual experiments. I decided to try out a more streamlined approach and started building Ridge. It gives agents common operations for accessing data and running commands across different environments, through MCP, a CLI, or Python. Local, SSH, Docker, and S3 are the initial providers. Copying a model from the bucket to the GPU box is one operation. There's also support for giving subagents narrower access and coordinating operations on shared resources with locks. I'm curious who else has run into this. What were you trying to do, and what did you end up building to make it work? Would appreciate feedback on the approach.

• Lifetrajectory with calculation, action plans 0 open listings

  discussion=https://news.ycombinator.com/item?id=49682127, title=Show HN: Lifetrajectory with calculation, action plans

• Light Converter 0 open listings

  discussion=https://news.ycombinator.com/item?id=49656814, title=Show HN: Light Converter – background removal that runs in the browser

• Lightning strike VFX in Three.js, a step-by-step breakdown 0 open listings

  discussion=https://news.ycombinator.com/item?id=49743030, title=Show HN: Lightning strike VFX in Three.js, a step-by-step breakdown

• Like LeetCode, but multi-file and multi-step 0 open listings

  discussion=https://news.ycombinator.com/item?id=49692593, title=Show HN: Like LeetCode, but multi-file and multi-step, On LeetCode you write one function, it passes, and you're done. Most AI labs such as Anthropic and OpenAI, as well as some big tech companies such as Meta, Snowflake and Databricks, don't stop in one function and instead ask multi-step questions that are closer to real-world problems. Say you're building a key-value store. Step 1 is get, set, delete, count. Once your tests pass, Step 2 unlocks: expiring keys. Then nested transactions. Then atomic batches. I built this because I couldn't find a good place to practice for multi-step, multi-file questions. The questions are based on ones people have reported from those loops. Check it out at https://loopprep.dev . There are 24 questions, 3 free, and no signup to try them. Happy to answer questions.

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