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
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 convergence.
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Article
Bounded LLM Fallback Chains
Learn how to build bounded LLM fallback chains that prevent cost overruns, respect rate limits, and stop on billing errors.
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Article
Publishing Threads Carousels from Worker-Hosted Images
Learn how to host multi-image Threads carousels directly inside a Cloudflare Worker using KV storage, bypass external object storage, and manage the publishing pipeline.
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Article
Fixing SonarCloud Quality Gate Rating E to A in Production
A practical guide to diagnosing, remediating, and maintaining a zero-defect SonarCloud Quality Gate Rating A across static web applications and frontend architectures without sacrificing developer velocity.
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Article
Fixing Zero-Click Technical Articles
Learn how to diagnose and resolve high-impression, zero-click search leaks on technical documentation by aligning metadata titles with developer error-intent queries.
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Article
Keeping Locked Characters Fresh with Rotating Scene Sets
Learn how to maintain character consistency in automated AI series while avoiding visual monotony by using deterministic rotating scene sets.
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Article
Fixing KV Propagation Delay in Media Publishing
Learn how to diagnose and fix media publishing failures caused by edge key-value storage propagation delays when third-party platforms fetch newly uploaded files.
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Article
Halving Codebase Duplication in Static Site Generators
Learn how to systematically detect, isolate, and collapse massive frontend template and CSS code duplication in static site generator projects while maintaining strict code quality quotas and zero regression test suites.
Read article
Article
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 convergence.
Read article
Article
Bounded LLM Fallback Chains
Learn how to build bounded LLM fallback chains that prevent cost overruns, respect rate limits, and stop on billing errors.
Read article
Article
Publishing Threads Carousels from Worker-Hosted Images
Learn how to host multi-image Threads carousels directly inside a Cloudflare Worker using KV storage, bypass external object storage, and manage the publishing pipeline.
Read article
Article
Fixing SonarCloud Quality Gate Rating E to A in Production
A practical guide to diagnosing, remediating, and maintaining a zero-defect SonarCloud Quality Gate Rating A across static web applications and frontend architectures without sacrificing developer velocity.
Read article
Article
Fixing Zero-Click Technical Articles
Learn how to diagnose and resolve high-impression, zero-click search leaks on technical documentation by aligning metadata titles with developer error-intent queries.
Read article
Article
Keeping Locked Characters Fresh with Rotating Scene Sets
Learn how to maintain character consistency in automated AI series while avoiding visual monotony by using deterministic rotating scene sets.
Read article
Article
Fixing KV Propagation Delay in Media Publishing
Learn how to diagnose and fix media publishing failures caused by edge key-value storage propagation delays when third-party platforms fetch newly uploaded files.
Read article
Article
Halving Codebase Duplication in Static Site Generators
Learn how to systematically detect, isolate, and collapse massive frontend template and CSS code duplication in static site generator projects while maintaining strict code quality quotas and zero regression test suites.
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
AndroidA Collection Of Final Project App
JetMovie
AndroidA Cool Movie App Build with Kotlin & Android Jetpack
Harmonia
AndroidAn AI-powered platform for comprehensive health analysis, from skin cancer detection to broader wellness features. Smart, intuitive, and user-friendly.
Story App
AndroidStory App Submission from Dicoding - Android Intermediate
ur persona
AndroidThe only app gonna tell u who u are (hopefully)
filmophilia
FlutterNetflix Clone using Flutter
WeeabooHub
AndroidCollection Anime HD Images App for Wallpaper
Gitray
AndroidAn Android Application to looking someone GitHub Profile.
Mathverse
AndroidA Collection Of Final Project App
JetMovie
AndroidA Cool Movie App Build with Kotlin & Android Jetpack
Harmonia
AndroidAn AI-powered platform for comprehensive health analysis, from skin cancer detection to broader wellness features. Smart, intuitive, and user-friendly.
Story App
AndroidStory App Submission from Dicoding - Android Intermediate
ur persona
AndroidThe only app gonna tell u who u are (hopefully)
filmophilia
FlutterNetflix Clone using Flutter
WeeabooHub
AndroidCollection Anime HD Images App for Wallpaper
Gitray
AndroidAn Android Application to looking someone GitHub Profile.
External publications
Also Published on Medium
RayLabs publishes canonical technical notes here first, then syndicates select articles to the wider Medium community.
Medium
The Numbers Said Go. The Product Still Had Gaps.
What a simple product case taught me about Go/No-Go decisions and moving forward with incomplete information.
Read on Medium
Medium
Android Paging 3 Failure Matrix
A comprehensive failure-first test matrix for Android Paging 3 screens, detailing refresh, append, offline recovery, empty results, and...
Read on Medium
Medium
Setting Up a Modern Android Development Environment
Learn how to establish a robust and reproducible Android development environment, covering IDE installation, SDK management, and device...
Read on Medium
Medium
WorkManager vs AlarmManager: How to Choose for Android Background Work
A practical decision guide for choosing WorkManager or AlarmManager based on timing precision, persistence, constraints, retries, and...
Read on Medium
Medium
Jetpack Compose Previews: Make Every UI State Reviewable
Build deterministic Jetpack Compose previews for loading, content, empty, error, themes, and screen sizes without depending on live app...
Read on Medium
Medium
Parallelize Independent Android Refreshes with Coroutines
Learn when Android repository calls can run concurrently, how structured concurrency changes failure behavior, and how to test parallel...
Read on Medium
Medium
Agent Authentication and Machine Commerce Protocols
A practical guide to building zero-dependency edge architectures for autonomous AI agent discovery, cryptographic verification, and...
Read on Medium
Medium
Jetpack Compose UI Testing Assertions
Learn how to choose and apply Jetpack Compose testing APIs for semantic assertions, handle UI test failure diagnostics, and structure...
Read on Medium
Medium
The Numbers Said Go. The Product Still Had Gaps.
What a simple product case taught me about Go/No-Go decisions and moving forward with incomplete information.
Read on Medium
Medium
Android Paging 3 Failure Matrix
A comprehensive failure-first test matrix for Android Paging 3 screens, detailing refresh, append, offline recovery, empty results, and...
Read on Medium
Medium
Setting Up a Modern Android Development Environment
Learn how to establish a robust and reproducible Android development environment, covering IDE installation, SDK management, and device...
Read on Medium
Medium
WorkManager vs AlarmManager: How to Choose for Android Background Work
A practical decision guide for choosing WorkManager or AlarmManager based on timing precision, persistence, constraints, retries, and...
Read on Medium
Medium
Jetpack Compose Previews: Make Every UI State Reviewable
Build deterministic Jetpack Compose previews for loading, content, empty, error, themes, and screen sizes without depending on live app...
Read on Medium
Medium
Parallelize Independent Android Refreshes with Coroutines
Learn when Android repository calls can run concurrently, how structured concurrency changes failure behavior, and how to test parallel...
Read on Medium
Medium
Agent Authentication and Machine Commerce Protocols
A practical guide to building zero-dependency edge architectures for autonomous AI agent discovery, cryptographic verification, and...
Read on Medium
Medium
Jetpack Compose UI Testing Assertions
Learn how to choose and apply Jetpack Compose testing APIs for semantic assertions, handle UI test failure diagnostics, and structure...
Read on Medium