Haacked @haacked.com · 28/08/2026I hate when cars coming out of an alley or driveway don’t stop at the sidewalk for pedestrians. So this time I let the driver know it, “What the fuck!” However I forgot I was on a call with a very confused support person. 🤣 050
Haacked @haacked.com · 08/04/2026Great post by my colleague about the work we did to reduce latency spikes in our feature flags service built with rust, Tokyo, and rayon: posthog.com/blog/untangl...posthog.comUntangling Tokio and Rayon in production: From 2s latency spikes to 94ms flatLearn how we discovered a big performance bottleneck in the Feature Flags service and made Tokio and Rayon play nice with each other. 030
Haacked @haacked.com · 25/03/2026Resolving gnarly merge conflicts can be a real tedious chore, until now. Grab a structural semantic merge tool, sprinkle a little AI on it, and you're going to have a lot less headaches. haacked.com/archive/2026...haacked.comResolve Merge Conflicts the Easy WayMerge conflicts don’t have to ruin your day. I use mergiraf for structural merging and a Claude Code skill for everything else. Here’s how to set it up. 273
Haacked @haacked.com · 05/03/2026Credit where credit is due, the new Slack AI bot has been a game changer for finding old slack conversations. I was skeptical, but it actually works for me. 020
Haacked @haacked.com · 28/02/2026My colleague @dmarticus wrote a great piece challenging the “AI wipes out white-collar jobs in 18 months” narrative. Software development isn’t typing code. It’s ambiguity, constraints, and coordination. That makes it much harder to fully automate: dylanamartin.com/2026/02/21/c...dylanamartin.comContra Yang, et al 160
Haacked @haacked.com · 06/01/2026Blogged: One year at PostHog haacked.com/archive/2026...haacked.comOne Year at PostHogReflections on my first year at PostHog. 093
Haacked @haacked.com · 04/12/2025I know it's just a stochastic parrot, but sometimes Claude can be wryly dismissive: 030
Haacked @haacked.com · 21/11/2025Blogged: Don't sleep on git worktrees like I did. But using them can be a bit of a chore. But here's a script that makes using git worktrees a breeze: haacked.com/archive/2025...haacked.comtree-me: Because git worktrees shouldn’t be a choreWorking on multiple branches simultaneously? I built tree-me to manage git worktrees without the ceremony. Convention over configuration for the win. 080
Haacked @haacked.com · 12/11/2025One more reason I love working at PostHog. Our changelog videos are legit hilarious and entertaining! www.youtube.com/watch?v=xCrf...youtube.comThe SDK Doctor will see you now | Changelog S1E3YouTube video by PostHog 020
Haacked @haacked.com · 10/11/2025My team is hiring a backend focused engineer: posthog.com/careers/back...posthog.comBackend Engineer — Feature Flags - PostHogThe single platform for engineers to analyze, test, observe, and deploy new features. Product analytics, session replay, feature flags, experiments, CDP, and more. 041
Haacked @haacked.com · 30/09/2025Check out spelungit: An MCP server I wrote for semantic search of git history. Fully local using a local LLM and sqlite to store embeddings. haacked.com/archive/2025... Plans to use stronger online models in the future, but for now, this works pretty well!haacked.comSpelungit: When git log --grep isn’t enoughEver tried to remember why you made a change six months ago? I built Spelungit so you can search Git commit history with natural language instead of praying to the regex gods. 0151
Haacked @haacked.com · 22/09/2025Great post from a colleague: four things in four years at PostHog. Lessons useful at any company: pauldambra.dev/2025/09/four...pauldambra.devFour things in four years at PostHogFour things I've learned in four years at PostHog 030
Haacked @haacked.com · 19/09/2025At every point in the universe, if you look out into space, the universe is expanding in all directions from that point. Every point in the universe is the center of the universe. So ma’am, in answer to your question if I think the world revolves around me, the universe does. 251
Haacked @haacked.com · 04/09/2025I think GitHub's CodeQL scanning is broken. It looks like every successive warning includes all the previous warnings. 100
Haacked @haacked.com · 23/07/2025I was trying to find an old router in my order history on Amazon and how did I order this before I was born?! 290
Haacked @haacked.com · 11/07/2025I recently adapted GitHub's scripts to rule them all github.com/github/scrip... to PostHog's existing bin scripts. Now it's a part of our handbook: posthog.com/handbook/eng... And there's a repo: github.com/PostHog/scri.... I love the cross-pollination that happens when companies are transparent.github.comGitHub - github/scripts-to-rule-them-all: Set of boilerplate scripts describing the normalized script pattern that GitHub uses in its projects.Set of boilerplate scripts describing the normalized script pattern that GitHub uses in its projects. - github/scripts-to-rule-them-all 030
Haacked @haacked.com · 20/05/2025TIL a fact that’s obvious to any French speaking person but wasn’t to me. If it’s not a crescent shape then it’s not a croissant because croissant is literally crescent in French. It might be a viennoiserie instead. 020
Reposted by HaackedMicah Lee @micahflee.com · 04/05/2025New bug report opened in the TM SGNL github repo github.com/micahflee/TM... 619645
Haacked @haacked.com · 30/04/2025I heard a scenario: Would you rather receive $1M dollars, or a penny on the 1st such that every penny doubles every calendar day. Of course I pick $1M dollars. What'm I to do with 1 billion pennies? That wouldn't fit in my apt. It'd weigh over 2750 tons! I don't want that headache. 230
Haacked @haacked.com · 18/04/2025Do you work on a repo that squash and merges PRs? Notice that `git branch --merged` doesn't work in that scenario? Want a git alias that can clean up merged branches even if they've been squashed? Well I got you! An update to my GitHub Flow aliases: haacked.com/archive/2025...haacked.comCleaning up gone branchesA git alias to clean up gone branches. Even ones that have been squashed and merged. 091
Haacked @haacked.com · 08/04/2025I now have an answer to the interview question, "What is the biggest technical challenge you've faced?". Answer: Getting a React Native project to build and run locally. I now feel like I can handle any technical challenge! 1110
Haacked @haacked.com · 04/04/2025Wrote some C# today as a palate cleanser. It’s like visiting family after living abroad in exotic places. 1100
Haacked @haacked.com · 04/04/2025TLDR; PostHog is hiring for a bunch of positions: posthog.com/careers I mentioned I started here in Jan: haacked.com/archive/2025... It's a great place to be a software engineer. Lots of interesting work and a great distributed and remote culture.posthog.comCareers - PostHogWe're working to increase the number of successful products in the world. Adventurers needed. 150
Haacked @haacked.com · 02/04/2025Finished up some client sdk work in Ruby, and I don't like it as much as I used to. I really miss my types. I may have to look at introducing Sorbet into the library in the future. Next stop is ... oh no ... PHP. God help me. 140
Haacked @haacked.com · 02/04/2025I’ve been having fun turning my Ghibli images back to photorealistic. 170
Haacked @haacked.com · 01/04/2025Wrote some Go finally. First impressions, I understand the appeal. It was quick to pick up, simple, and fast. Though I prefer rust for its richer type system. 350
Haacked @haacked.com · 01/04/2025My son has a group chat with his gamer friends and they made my photo as the group chat image. Don’t know whether to feel flattered or concerned. 😂 040
Haacked @haacked.com · 25/03/2025Null, the billion dollar mistake. Python: don’t worry, we just call it “None” 1112
Haacked @haacked.com · 17/03/2025In honor of St. Paddy’s day WeWork is now WeeWork because it’s where the wee folk work. (Please read in your best Irish accent) 020
Haacked @haacked.com · 15/03/2025I mentioned that I’m not hating Rust (the language, not the oxidation of iron). There are aspects of its type system I really like. For example, its enum is powerful in that it supports full types. This great for versioning APIs.github.comfeat(flags): Implement `/decide?v=4` with version info by haacked · Pull Request #29751 · PostHog/posthogThis implements /decide?v=4 and /flag?v=2. Changes Decide v=3 looks something like this: { "featureFlags": { "multivariate-feature": "first-variant-key", ... 130
Haacked @haacked.com · 11/03/2025Is this what WINNING feels like? Trumponomics in action. Glad I unretired when I did. 0160
Haacked @haacked.com · 06/03/2025Mobile apps that don’t let you select important text such as a long ass transaction number infuriate me. Yeah, I’m talking about you American Express! 1120
Haacked @haacked.com · 25/02/2025Blogged: Using PostHog in your .NET apps. haacked.com/archive/2025... I just released the 1.0 of the `PostHog.AspNetCore` for adding analytics, feature flags, etc in your web apps.haacked.comUsing PostHog in your .NET applicationsPostHog is a product analytics platform that helps you build better products faster. It contains a set of tools to help you capture analytics and leverage feature flags. 2111
Haacked @haacked.com · 14/02/2025Looking for folks to give github.com/PostHog/post... a try. I think it’s ready, but could use feedback!github.comGitHub - PostHog/posthog-dotnet: A dotnet client sdk to the PostHog APIA dotnet client sdk to the PostHog API. Contribute to PostHog/posthog-dotnet development by creating an account on GitHub. 1112
Haacked @haacked.com · 14/02/2025When building a library, I highly recommend building out the simplest code samples and writing documentation before you stamp the release as 1.0.0. I'm finding so many dumb usability issues. 1150
Haacked @haacked.com · 14/02/2025"Any time I see 2 strings being compared with lower() it tickles my spidey senses." - things I've said in Slack today. 240
Haacked @haacked.com · 14/02/2025I’ve been in such a flow state at work that’s it’s actually hard to stop. It’s been a while since I’ve enjoyed work so much! 0130
Haacked @haacked.com · 13/02/2025Code that generates code is some of the most difficult code to write. 4162
Haacked @haacked.com · 06/02/2025Ok, what is your favorite cocktail bar in Shibuya? Someplace I can get a really good old fashioned? 121