Ehsanul Hoque — ArticlesWorking notes from a Kotlin engineer in Dhaka. Android, Kotlin Multiplatform, real-time systems, in-app billing, and the unglamorous infra that ships products.https://ehsanfahad.dev/enWhy LLMs Couldn't Count the R's in "Strawberry" — and How Spelling It Out Fixed Ithttps://ehsanfahad.dev/articles/why-llms-could-not-count-letters/https://ehsanfahad.dev/articles/why-llms-could-not-count-letters/An AI that writes essays and debugs code couldn't count the r's in "strawberry." The reason reveals how LLMs really see text — and the fix is simply spelling it out.Thu, 11 Jun 2026 00:00:00 GMTllmtokenizationaimachine learningprompt engineeringchain-of-thoughtnlpchatgptstrawberry problemai limitationsThe Java Chronicles: From Oak to Android: One Language, Many Flavors — Java SE, EE, ME, and the Rest of the Familyhttps://ehsanfahad.dev/series/the-java-chronicles/java-editions-se-ee-me-javafx-explained/https://ehsanfahad.dev/series/the-java-chronicles/java-editions-se-ee-me-javafx-explained/Java isn't one thing — it's a family of platforms built for different worlds. Here's how to tell them apart and why they exist.Sat, 06 Jun 2026 00:00:00 GMTjavajakarta-eejvmThe Java Chronicles: From Oak to Android: The Island, the Oak Tree, and the Internet — The Birth of Javahttps://ehsanfahad.dev/series/the-java-chronicles/java-history-write-once-run-anywhere/https://ehsanfahad.dev/series/the-java-chronicles/java-history-write-once-run-anywhere/How a team at Sun Microsystems set out to build software for cable TV boxes — and accidentally created one of the most influential programming languages in history.Thu, 07 May 2026 00:00:00 GMTjavahistoryjvmNotes on WebRTC echo cancellation, after twelve device familieshttps://ehsanfahad.dev/articles/webrtc-aec-matrix/https://ehsanfahad.dev/articles/webrtc-aec-matrix/AEC defaults look fine in the office and embarrassing on a Pixel 4a in a café. Here's what actually worked across the matrix.Tue, 28 Apr 2026 00:00:00 GMTandroidwebrtc