https://blog.simiyonvinscentsamuel.tech/ Engineering write-ups: system design, architecture and the code behind the projects I build. en Sun, 08 Nov 2026 00:00:00 GMT https://blog.simiyonvinscentsamuel.tech/unfuck-android-debloat/ https://blog.simiyonvinscentsamuel.tech/unfuck-android-debloat/ Sun, 08 Nov 2026 00:00:00 GMT How unfuck-android debloats ColorOS, Funtouch, HyperOS and One UI phones over ADB without root: why pm disable-user beats uninstall, brand detection, a dry run and baseline-driven rollback, and per-category package lists vetted against two upstream databases. Android ADB Privacy PowerShell Open source https://blog.simiyonvinscentsamuel.tech/cc-cms-github-actions/ https://blog.simiyonvinscentsamuel.tech/cc-cms-github-actions/ Tue, 03 Nov 2026 00:00:00 GMT A deep dive into the SSN Coding Club CMS: Git as the database, the draft-branch and pull-request publish flow, role and approval rules enforced server-side, and one GitHub Actions workflow that validates content and deploys only the apps that changed. GitHub Actions Next.js Vercel Git as a database CMS https://blog.simiyonvinscentsamuel.tech/claude-coding-mascot-bloub/ https://blog.simiyonvinscentsamuel.tech/claude-coding-mascot-bloub/ Mon, 02 Nov 2026 00:00:00 GMT How a VS Code extension, a Vercel function and Redis turn editor activity into a sleeping or coding cloud inside GitHub's image proxy, and how the Bloub engine by Jérémy Perret was extended with faces, animations and generators to bake the cards. VS Code SVG SMIL Redis Vercel System design https://blog.simiyonvinscentsamuel.tech/github-profile-platform/ https://blog.simiyonvinscentsamuel.tech/github-profile-platform/ Mon, 02 Nov 2026 00:00:00 GMT Five small Vercel services render the animated cards on my GitHub profile. A 30-palette colour clock keeps them in lockstep across separate servers, a stale-while-revalidate cache keeps them inside GitHub's four-second image-proxy window, Redis holds the state of a live coding mascot, and GitHub Actions bake the contribution Pac-Man. Vercel SVG Upstash Redis GitHub Actions Edge caching https://blog.simiyonvinscentsamuel.tech/clash-of-progs-postmortem/ https://blog.simiyonvinscentsamuel.tech/clash-of-progs-postmortem/ Sat, 10 Oct 2026 00:00:00 GMT A full diagnosis of the 9 October 2026 outage at the Clash of Progs live event: hidden writes on read paths, a pinned SQLite WAL, six commits per match, CPU work on the event loop and a single process doing everything, plus the Postgres-and-queue architecture it should have had. SQLite FastAPI Post-mortem Postgres System design https://blog.simiyonvinscentsamuel.tech/honeyledge-beehive-provenance/ https://blog.simiyonvinscentsamuel.tech/honeyledge-beehive-provenance/ Tue, 29 Sep 2026 00:00:00 GMT How HoneyLedge records honey batches in a Solidity contract, splits them into child batches that keep their lineage, settles Cashfree payments through a relayer, and raises hive alerts from a sensor simulator, plus the three-check QR gate and ESP32 sensors that are still only a proposal. Blockchain Arbitrum Next.js IoT Solidity System design https://blog.simiyonvinscentsamuel.tech/chainwatch-sih-2026/ https://blog.simiyonvinscentsamuel.tech/chainwatch-sih-2026/ Mon, 07 Sep 2026 00:00:00 GMT How team Hashcrofts built ChainWatch for the NTRO problem statement SIH26146, and what I built inside it: a causal feature pipeline, a calibrated XGBoost model with SHAP reasons, Safe-CIOH entity clustering, an alerts.jsonl pipeline, an offline wheelhouse installer and a Redis-backed telemetry map. Python XGBoost Bitcoin SIH 2026 Offline Redis https://blog.simiyonvinscentsamuel.tech/trivarna-ctf-writeup/ https://blog.simiyonvinscentsamuel.tech/trivarna-ctf-writeup/ Sun, 16 Aug 2026 00:00:00 GMT A write-up of TRIVARNA 2.0, a CSEMA capture-the-flag event: how I triaged across categories, then deep dives into an ECDSA nonce-reuse key recovery, an ARM64 native library emulated with Unicorn, a JWT jku header-injection bug, and an MQTT forensics chain. CTF Cryptography Reverse Engineering Android Security https://blog.simiyonvinscentsamuel.tech/crime-intelligence-assistant/ https://blog.simiyonvinscentsamuel.tech/crime-intelligence-assistant/ Sat, 25 Jul 2026 00:00:00 GMT How a shortlisted Zoho hackathon assistant for state police works: a LangGraph retrieval pipeline over graph, RAG and SQL, Zia voice in three languages, and the hardening I did: a CORS wildcard guard, locks around the indexes that lost writes, and a security pass on rank-based RBAC and expiring tokens. Zoho Catalyst FastAPI LangGraph Security RBAC https://blog.simiyonvinscentsamuel.tech/leetcode-stats-card-svg/ https://blog.simiyonvinscentsamuel.tech/leetcode-stats-card-svg/ Mon, 13 Jul 2026 00:00:00 GMT How a single serverless function turns LeetCode data into a composable SVG card with six sections and 167 themes: a layout engine without a solver, streaks from the full history, CSS-only animation that survives an img tag, a shared-clock colour cycle behind camo, and cache headers that never leave a broken image. SVG Vercel TypeScript GitHub README System design https://blog.simiyonvinscentsamuel.tech/voxa-voice-to-text/ https://blog.simiyonvinscentsamuel.tech/voxa-voice-to-text/ Thu, 21 May 2026 00:00:00 GMT The full design of Voxa, the dictation tool I use daily: an Electron desktop app and a Kotlin Android keyboard that record speech, sign in to chatgpt.com like a browser, call its web transcription endpoint with my own session, and put the text into whatever field has focus. Covers the sign-in flow, the exact request, a focus-safe recording strip, two insertion mechanisms, durable audio and history, and the trade-offs stated plainly. Electron Kotlin Android IME Reverse Engineering System Design https://blog.simiyonvinscentsamuel.tech/flashbook-serverless-ai/ https://blog.simiyonvinscentsamuel.tech/flashbook-serverless-ai/ Sun, 08 Mar 2026 00:00:00 GMT How I built the AWS backend behind FlashBook, a Flutter app that turns PDFs into swipeable cards with Gemini: a default Cognito authorizer, presigned uploads, a hash-keyed summary cache, defensive output parsing and a client-side rate budget, plus what is still wrong with it. Flutter AWS Lambda DynamoDB Serverless Gemini System design https://blog.simiyonvinscentsamuel.tech/chillz-iptv-flutter/ https://blog.simiyonvinscentsamuel.tech/chillz-iptv-flutter/ Sun, 18 Jan 2026 00:00:00 GMT How a public IPTV catalogue of 10,320 channels becomes a player on three platforms: a six-file merge with a one-hour cache, a virtualised list, HLS.js playback with its own failure vocabulary, and a Flutter desktop app that embeds libVLC behind a worker thread. Flutter HLS React libVLC System design https://blog.simiyonvinscentsamuel.tech/farmledge-sih-2025/ https://blog.simiyonvinscentsamuel.tech/farmledge-sih-2025/ Tue, 23 Sep 2025 00:00:00 GMT FarmLedge, a Smart India Hackathon 2025 national finalist: batches on an Arbitrum Sepolia contract, provenance on IPFS, a relayer that moves ownership after a Stripe payment, and an honest look at the webhook idempotency and access-control gaps. Solidity Blockchain TypeScript Stripe IPFS Smart India Hackathon