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.
knowledge-systems
AI Product Manager vs Traditional Product Manager
Compare the core responsibilities, decision rights, and model governance challenges of an AI product manager versus a traditional product manager.
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ai-agents
Alpha Beta UAT Differences in Software Testing
A practical guide for product teams distinguishing alpha testing, beta testing, and user acceptance testing through definitions, exit criteria, and trade-offs.
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knowledge-systems
Enterprise Software Usability Testing Prototype
Learn how to run practical prototype usability tests for enterprise software by focusing on task-level friction, realistic scenarios, observation logs, and severity-based issue triage.
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knowledge-systems
Enterprise vs Consumer Buyers: Product Research Strategies
An in-depth technical guide for product teams examining how multi-person buying dynamics alter product discovery, stakeholder mapping, and user interviews.
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ai-agents
Ai Agent Crash Recovery Idempotency Key Drift
Explore why hash-only idempotency fails during AI agent crashes and learn how intent locking and full payload replay prevent duplicate external mutations upon reboot.
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knowledge-systems
Product Roadmap vs Project Plan: When Do You Need Each?
A practical guide for distinguishing product roadmaps from project plans, helping teams align strategic vision with delivery schedules without confusing high-level intent with task execution.
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developer-tools
SaaS Product Maintenance KPIs
Practical guidance for product teams researching SaaS product maintenance KPIs, including activation, retention, adoption, incidents, latency, and denominators.
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knowledge-systems
Generative AI Product Discovery
Practical guidance for product teams utilizing generative AI for product discovery, focusing on source verification, evidence checkpoints, and workflow trade-offs.
Read article
knowledge-systems
AI Product Manager vs Traditional Product Manager
Compare the core responsibilities, decision rights, and model governance challenges of an AI product manager versus a traditional product manager.
Read article
ai-agents
Alpha Beta UAT Differences in Software Testing
A practical guide for product teams distinguishing alpha testing, beta testing, and user acceptance testing through definitions, exit criteria, and trade-offs.
Read article
knowledge-systems
Enterprise Software Usability Testing Prototype
Learn how to run practical prototype usability tests for enterprise software by focusing on task-level friction, realistic scenarios, observation logs, and severity-based issue triage.
Read article
knowledge-systems
Enterprise vs Consumer Buyers: Product Research Strategies
An in-depth technical guide for product teams examining how multi-person buying dynamics alter product discovery, stakeholder mapping, and user interviews.
Read article
ai-agents
Ai Agent Crash Recovery Idempotency Key Drift
Explore why hash-only idempotency fails during AI agent crashes and learn how intent locking and full payload replay prevent duplicate external mutations upon reboot.
Read article
knowledge-systems
Product Roadmap vs Project Plan: When Do You Need Each?
A practical guide for distinguishing product roadmaps from project plans, helping teams align strategic vision with delivery schedules without confusing high-level intent with task execution.
Read article
developer-tools
SaaS Product Maintenance KPIs
Practical guidance for product teams researching SaaS product maintenance KPIs, including activation, retention, adoption, incidents, latency, and denominators.
Read article
knowledge-systems
Generative AI Product Discovery
Practical guidance for product teams utilizing generative AI for product discovery, focusing on source verification, evidence checkpoints, and workflow trade-offs.
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
Android Notification Opens vs App Opens: Measure the Entry Point
A practical Android analytics pattern for separating notification-driven sessions from ordinary app launches without double-counting...
Read on Medium
Medium
Android Code Coverage in CI: JaCoCo Setup, Exclusions, and Thresholds
Build useful Android coverage gates with JaCoCo, variant-aware reports, CI artifacts, and thresholds that protect behavior instead of...
Read on Medium
Medium
Android ViewModel Unit Testing: StateFlow, Coroutines, and Deterministic Tests
A practical Android ViewModel testing guide for StateFlow and coroutines, with deterministic scheduling, state-transition assertions...
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
Android Notification Opens vs App Opens: Measure the Entry Point
A practical Android analytics pattern for separating notification-driven sessions from ordinary app launches without double-counting...
Read on Medium
Medium
Android Code Coverage in CI: JaCoCo Setup, Exclusions, and Thresholds
Build useful Android coverage gates with JaCoCo, variant-aware reports, CI artifacts, and thresholds that protect behavior instead of...
Read on Medium
Medium
Android ViewModel Unit Testing: StateFlow, Coroutines, and Deterministic Tests
A practical Android ViewModel testing guide for StateFlow and coroutines, with deterministic scheduling, state-transition assertions...
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
