Zero-subscription Obsidian vault synchronization using personal GitHub repositories with automatic 3-way merge conflict safety.
Useful software starts with clear thinking.
Practical engineering studies, intelligent systems, and open software projects by Ray. Built with clarity, zero bloat, and verified evidence.
Technical writing
Recent Technical Articles
In-depth engineering notes, multi-agent review workflows, and developer infrastructure explained through working examples.
Article
breadcrumblist JSON-LD Synchronization and Maintenance
Learn how to keep visible breadcrumb trails and JSON-LD structured data synchronized by generating both from a single source of truth.
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Article
Fix Android WebView onShowFileChooser Overlapping Callback
Learn how to correctly manage Android WebView onShowFileChooser callbacks, handle overlapping chooser requests, complete cancellations, and process URI results safely.
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Article
Polling Cursor Checkpoint Crash Halfway Through Page
Learn how to handle mid-batch crashes during API polling by separating retrieval progress from side-effect completion and tracking per-item recovery evidence.
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Article
WorkManager Unique Periodic Work
Preventing duplicate work and race conditions with unique periodic work in Android WorkManager.
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Article
Cloudflare Worker Image Download Stream Error Recovery
Learn how to keep a Cloudflare Worker image selection pipeline running when an HTTP response stream fails after headers return successfully.
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Article
Fetch Error Response Bodies Bound Before Parsing JSON Safely
Learn how to bound untrusted HTTP error response bodies during streaming, prevent memory exhaustion, and handle malformed JSON payloads safely.
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Article
Monitor Serverless Publishing Without Triggering It
Learn how to build a read-only operator dashboard for serverless publishing workflows on Cloudflare Workers without risking duplicate runs.
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Article
SonarCloud LCOV Imports Fail When Paths Drift
Fix SonarCloud LCOV import failures when report paths drift in monorepos by aligning working directories, root resolution, and source file references.
Read article
Article
breadcrumblist JSON-LD Synchronization and Maintenance
Learn how to keep visible breadcrumb trails and JSON-LD structured data synchronized by generating both from a single source of truth.
Read article
Article
Fix Android WebView onShowFileChooser Overlapping Callback
Learn how to correctly manage Android WebView onShowFileChooser callbacks, handle overlapping chooser requests, complete cancellations, and process URI results safely.
Read article
Article
Polling Cursor Checkpoint Crash Halfway Through Page
Learn how to handle mid-batch crashes during API polling by separating retrieval progress from side-effect completion and tracking per-item recovery evidence.
Read article
Article
WorkManager Unique Periodic Work
Preventing duplicate work and race conditions with unique periodic work in Android WorkManager.
Read article
Article
Cloudflare Worker Image Download Stream Error Recovery
Learn how to keep a Cloudflare Worker image selection pipeline running when an HTTP response stream fails after headers return successfully.
Read article
Article
Fetch Error Response Bodies Bound Before Parsing JSON Safely
Learn how to bound untrusted HTTP error response bodies during streaming, prevent memory exhaustion, and handle malformed JSON payloads safely.
Read article
Article
Monitor Serverless Publishing Without Triggering It
Learn how to build a read-only operator dashboard for serverless publishing workflows on Cloudflare Workers without risking duplicate runs.
Read article
Article
SonarCloud LCOV Imports Fail When Paths Drift
Fix SonarCloud LCOV import failures when report paths drift in monorepos by aligning working directories, root resolution, and source file references.
Read article
Featured software
Independent Tools
Focused software and productivity tools designed and engineered by RayLabs.
Monumental presentation clock designed for speakers and conferences, featuring zero-jitter tabular numerals, ambient audio, and full-screen projection.
Send technical articles to a Medium draft in one click while preserving code blocks, images, topics, and canonical attribution locally in your browser.
Open-source projects
Recent GitHub Projects
Public repositories and active software tools created by Ray across Android, web, and automation.
Mathverse Mobile
AndroidInteractive mathematical simulation and computational learning tools built on modern Android.
JetMovie App
AndroidA modern Android movie catalog application built with Kotlin, Jetpack Compose, and offline Room caching.
Harmonia AI Health
AI PLATFORMAI-powered platform for comprehensive health analysis, skin cancer detection, and personal diagnostics.
Story App Android
AndroidStory submission and location-based media sharing app built with Kotlin Flow and Retrofit.
Ur Persona
AndroidPersonality insight and introspection utility application built for Android.
Filmophilia Flutter
FlutterStreaming catalog mobile application exploring cross-platform Flutter and Dart state management.
WeeabooHub
AndroidCurated high-resolution anime digital artwork and wallpaper curation application.
Gitray GitHub Viewer
AndroidAn Android application to explore and inspect GitHub profiles and developer activity.
Mathverse Mobile
AndroidInteractive mathematical simulation and computational learning tools built on modern Android.
JetMovie App
AndroidA modern Android movie catalog application built with Kotlin, Jetpack Compose, and offline Room caching.
Harmonia AI Health
AI PLATFORMAI-powered platform for comprehensive health analysis, skin cancer detection, and personal diagnostics.
Story App Android
AndroidStory submission and location-based media sharing app built with Kotlin Flow and Retrofit.
Ur Persona
AndroidPersonality insight and introspection utility application built for Android.
Filmophilia Flutter
FlutterStreaming catalog mobile application exploring cross-platform Flutter and Dart state management.
WeeabooHub
AndroidCurated high-resolution anime digital artwork and wallpaper curation application.
Gitray GitHub Viewer
AndroidAn Android application to explore and inspect GitHub profiles and developer activity.
External publications
Also Published on Medium
RayLabs publishes canonical technical notes here first, then syndicates select articles to the wider Medium community.
Medium
How to Check Android Connectivity Without Lying to Your UI
Use ConnectivityManager and NetworkCapabilities as signals, not promises, and design Android networking around validated state, retries...
Read on Medium
Medium
Reliable Calendar Date Calculations in Android
Learn how to build robust calendar date calculations and predictive modeling structures in modern Android applications using Kotlin...
Read on Medium
Medium
Android App Updates: Play Store vs Enterprise Managed Device Strategy
Choose the right Android update path for Play-distributed apps, enterprise-managed fleets, and true OS OTA updates without mixing three...
Read on Medium
Medium
Android ABI Filters: How to Choose Architectures Without Breaking Devices
A practical guide to Android ABI filters, native library packaging, 32-bit and 64-bit support, and testing architecture choices across...
Read on Medium
Medium
Agent Orchestrator vs Model Router: Architecture for Multi-Agent AI Systems
Separate workflow orchestration from model routing so multi-agent systems can choose the right worker and the right model without...
Read on Medium
Medium
Always-On AI Agent Architecture
Explore the structural patterns, tool permissions, and human approval gates required to build reliable, always-on AI agent architectures...
Read on Medium
Medium
Preview Cross-System Data Changes Before Sync
Learn how to preview data differences between Google Sheets and a backend database before syncing, block ambiguous changes, and verify...
Read on Medium
Medium
Nightly Analyst Digest from Slot Activity Logs
Learn how to build a reliable scheduled digest email for high-frequency serverless cron systems, featuring local-timezone logging...
Read on Medium
Medium
How to Check Android Connectivity Without Lying to Your UI
Use ConnectivityManager and NetworkCapabilities as signals, not promises, and design Android networking around validated state, retries...
Read on Medium
Medium
Reliable Calendar Date Calculations in Android
Learn how to build robust calendar date calculations and predictive modeling structures in modern Android applications using Kotlin...
Read on Medium
Medium
Android App Updates: Play Store vs Enterprise Managed Device Strategy
Choose the right Android update path for Play-distributed apps, enterprise-managed fleets, and true OS OTA updates without mixing three...
Read on Medium
Medium
Android ABI Filters: How to Choose Architectures Without Breaking Devices
A practical guide to Android ABI filters, native library packaging, 32-bit and 64-bit support, and testing architecture choices across...
Read on Medium
Medium
Agent Orchestrator vs Model Router: Architecture for Multi-Agent AI Systems
Separate workflow orchestration from model routing so multi-agent systems can choose the right worker and the right model without...
Read on Medium
Medium
Always-On AI Agent Architecture
Explore the structural patterns, tool permissions, and human approval gates required to build reliable, always-on AI agent architectures...
Read on Medium
Medium
Preview Cross-System Data Changes Before Sync
Learn how to preview data differences between Google Sheets and a backend database before syncing, block ambiguous changes, and verify...
Read on Medium
Medium
Nightly Analyst Digest from Slot Activity Logs
Learn how to build a reliable scheduled digest email for high-frequency serverless cron systems, featuring local-timezone logging...
Read on Medium