Private AI coding, and the engineering behind CodeTrain. Written by Ethan Ludwig.https://inferhaven.com/en-ushttps://inferhaven.com/blog/2026-08-07-the-bug-your-test-cannot-see/https://inferhaven.com/blog/2026-08-07-the-bug-your-test-cannot-see/A four-line function that returns the right answer, passes its test, and quietly corrupts the caller's data. Why no return-value assertion can catch it, and why I built a lesson about it that runs on the CodeTrain landing page, no login required.Fri, 07 Aug 2026 00:00:00 GMTCodeTrainJavaScripttestingside effectslodashengineeringhttps://inferhaven.com/blog/2026-08-04-review-you-cannot-reproduce/https://inferhaven.com/blog/2026-08-04-review-you-cannot-reproduce/Your team ships faster than it can explain. That gap does not show up in a dashboard, it shows up the night something breaks. What engineering leads can actually do about it.Tue, 04 Aug 2026 00:00:00 GMTengineering leadershipcode reviewAI codingonboardingteamhttps://inferhaven.com/blog/2026-07-29-tutor-that-refuses-to-write-code/https://inferhaven.com/blog/2026-07-29-tutor-that-refuses-to-write-code/The never-write rule sounds like a prompt. It turned into a grading contract, two execution paths, and a pile of things that broke in production. Here is the whole build.Wed, 29 Jul 2026 00:00:00 GMTCodeTrainAI codingPyodidesandboxingprompt designengineeringhttps://inferhaven.com/blog/2026-07-13-introducing-codetrain/https://inferhaven.com/blog/2026-07-13-introducing-codetrain/An AI trainer that teaches you on your own codebase and never writes the code for you. Free, no card, live today.Mon, 13 Jul 2026 00:00:00 GMTCodeTrainAI codingtrainingcoding bootcampsocraticlearninghttps://inferhaven.com/blog/2026-06-20-privacy-as-the-baseline/https://inferhaven.com/blog/2026-06-20-privacy-as-the-baseline/Local models on hardware you control are how you build AI workflows that don't break when a vendor does. Here's the case for local-first development, and the mission InferHaven ships against: make privacy and security the default, not a feature you pay extra to unlock.Sat, 20 Jun 2026 00:00:00 GMTlocal LLMsprivacymissionself-hostinghttps://inferhaven.com/blog/2026-06-18-building-haven-bench-in-the-open/https://inferhaven.com/blog/2026-06-18-building-haven-bench-in-the-open/I shipped a tokens/sec benchmark for local models. The unit tests were green, and then CI turned red in a way that looked like my fault. It wasn't. Here's the whole hunt: a chown that raced the tide, set -e, and a zsh lock file that vanished mid-sweep.Thu, 18 Jun 2026 00:00:00 GMTbuild in the opendebuggingcilocal LLMshttps://inferhaven.com/blog/2026-06-12-source-is-live/https://inferhaven.com/blog/2026-06-12-source-is-live/Today inferhaven-core goes public on GitHub under FSL-1.1-ALv2. Why we picked fair source instead of MIT or Apache, what that means for you in practice, and what comes next on the road to InferHaven Cloud.Fri, 12 Jun 2026 00:00:00 GMTreleaselicensingfair sourceroadmaphttps://inferhaven.com/blog/2026-06-08-the-private-ai-coding-box/https://inferhaven.com/blog/2026-06-08-the-private-ai-coding-box/A common question is why run InferHaven instead of Ollama, or Continue, or Tabby, or a cloud IDE? Most of those things run on InferHaven. Here's the honest map of what we are, what we aren't, and when you should pick something else.Mon, 08 Jun 2026 00:00:00 GMTlocal LLMscomparisonself-hostinghttps://inferhaven.com/blog/2026-05-13-why-offline-default/https://inferhaven.com/blog/2026-05-13-why-offline-default/Using a cloud API sends your repo to someone else. InferHaven flips that default: your code stays local, and the network is an opt-in, not an opt-out.Wed, 13 May 2026 00:00:00 GMTlocal LLMssecurityprivacy