Show HN: Jynx, a matchmaking app to find gaming teammates https://ift.tt/7iJf6nu

Show HN: Jynx, a matchmaking app to find gaming teammates TL;DR: Jynx is a gaming social platform that matches you with compatible teammates based on skill level, play style and schedule. Swipe to find players (Tinder-style), create or join game sessions (LFG), chat, and build your squad. 214k lines of Dart, 23 feature modules, built entirely with Claude Code as my entry into agentic engineering. Live on App Store and Play Store: https://ift.tt/9oizL30 https://ift.tt/cJECKjw... --- Hi HN, long time lurker, first time poster, be gentle. Developer by day, vibe coder by night: Jynx is the project I used to ease into agentic engineering. AI talks are mitigated, at best. But I'll talk about my experience here. Forgive my erratic style, it is what it is. Working with Claude from the very beginning, it's been a blast. I had the "chance" to have the time necessary to learn and use AI a lot. Lots of different techniques that quickly became completely obsolete today. Without LLMs, it would have been extremely hard to have the same app than I have today. I used Flutter (Dart) to avoid having to dev and maintain two codebases. It is not a language I knew. Learning the language first would have severely hindered the process. For me, from copy/paste to using MCP then Roo Code, then Claude Code was an ecstatic process. I always loved having ideas but the time it would take me to build the thing and test it always felt too long. Not anymore. So we carefully designed, iterated and implemented the two codebases for Jynx. One for the flutter app, one for the firebase backend. I chose Firebase to avoid having to maintain a server and be able to focus on the UI/UX of the app. We started thinking about it in December 2024 and started devs early 2025; not working on it full time at all. We really poured our heart into it and we truly tried to make it as secure as possible. Even though we mean business, it is a passion project. By using the excuse of learning agentic flows, I took the time to inspect each aspects of the app's systems thoroughly. Tech stack: - Flutter 3.41 / Dart 3.11 (single codebase, iOS + Android) - Firebase (Firestore, Cloud Functions in TypeScript, Auth, Storage, FCM) - Riverpod 3.1 + Freezed + json_serializable for state management & immutable models - Drift for encrypted local SQLite caching (offline-first architecture to optimize Firebase costs) - Clean Architecture with feature modules and mixin-based repositories - Sentry + Firebase Crashlytics for production error reporting - Freerasp for runtime app self-protection (tamper detection, root/jailbreak) Agentic engineering artifacts: - Claude Code (Claude + GLM) as primary coding agent - 22 hooks, 18 skills, 13 instincts, 8 rule files, custom subagents, slash commands, MCP servers and plugins (instincts system from Affaan's https://ift.tt/UqckWv1 ) - GitNexus - MemPalace for persistent context across sessions Stats: 1,239 Dart files, 214k lines of code (excluding generated boilerplate), 30k lines of comments across the Flutter codebase. I made a detailed cheatsheet document about my whole setup if you want it. I could post it or you DM me. If you have questions, ask away, I'll gladly answer. Test it and tell me what you think of it honestly, I won't get offended! Take care, Antoine https://jynx.app/ May 30, 2026 at 03:45AM

Show HN: Helios – what plug-in solar could generate for any address in Britain https://ift.tt/3UCy2YQ

Show HN: Helios – what plug-in solar could generate for any address in Britain Plug-in solar panels (no electrician needed) have just become legal in the UK and will go on sale soon. Helios estimates how much electricity a typical installation could generate at a given address and what that's worth against your tariff. It uses UK government LIDAR data to reflect the actual skyline, so it knows whether there's a building or a hill blocking the sun. Caveats: - Outside LIDAR coverage (most of Scotland and Wales) it falls back to a synthetic horizon (less accurate). - Trees and recent developments (post-2022 or so) may not be in the data, and some address placements could be off (geocoding via OSM). Feedback on the shading model especially welcome. https://ift.tt/kIWLPDM May 30, 2026 at 01:08AM

Show HN: Local-first semantic knowledge graph with magnetic-pull retrieval https://ift.tt/QR72jCt

Show HN: Local-first semantic knowledge graph with magnetic-pull retrieval https://ift.tt/nbBF1Rx May 29, 2026 at 03:31AM

Show HN: Context-aware Japanese furigana using Sudachi and ModernBERT https://ift.tt/d0A6iw4

Show HN: Context-aware Japanese furigana using Sudachi and ModernBERT https://ift.tt/bR5HkeJ May 29, 2026 at 02:24AM

Show HN: Compile-time model-id validation with declared capability https://ift.tt/qRjnKLG

Show HN: Compile-time model-id validation with declared capability https://ift.tt/W7xp26N May 26, 2026 at 04:20AM

Show HN: LiteParse v2, now in Rust 100x faster https://ift.tt/F9m5tQS

Show HN: LiteParse v2, now in Rust 100x faster https://ift.tt/Rf39ioY May 28, 2026 at 02:15AM

Show HN: AT4K Launcher - Apple TV inspired Launcher for Android TVs https://ift.tt/1OIwG7Z

Show HN: AT4K Launcher - Apple TV inspired Launcher for Android TVs Hi HN! I'm the developer of OffChess a Hackernews favorite Chess puzzles app. About 6 months ago I saw someone reviewing an Apple TV 4k on their youtube channel and it looked vastly superior in terms of UI and UX to what Android based Google TVs provide. I asked the people over at r/AndroidTV if someone has ported Apple TV experience to Android TV and they said no. So I built a makeshift video and posted on Reddit. People there loved it and started sending me Reddit chat messages every day to build and launch it. So it took me 3 months to solve all edge cases and I built and launched AT4K Launcher in January and people absolutely loved it. Since then BGR, Android Authority, Makeuseof and multiple tech websites have featured it as one of the best Android Launchers. Clean, fast, minimal, pretty, no accounts, no tracking, no monthly subscriptions, no internet required. Just you and your apps. With Live wallpaper, custom app icons, icon packs support and multiple ways to modify your home screen AT4K Launcher packs everything you need in a neat ui. Here is the play store link- https://ift.tt/uPpKJYo... Would love feedback, bug reports, or suggestions. Thanks! https://ift.tt/y2k74fi May 27, 2026 at 11:43PM