Writing | Tehan WijeratneBanking operations professional at HSBC (First Direct UK) with RPA, KYC and ServiceNow experience. BSc Data Science student at SLIIT, Colombo.https://tehan-wijeratne.web.app/5 Things I Learned From a Year and a Half in Banking Operationshttps://tehan-wijeratne.web.app/writing/banking-ops/https://tehan-wijeratne.web.app/writing/banking-ops/Lessons on detail, process, escalation, and changing my mind.Sat, 31 Oct 2026 00:00:00 GMTBuilding a Reconciliation Tool in One HTML Filehttps://tehan-wijeratne.web.app/writing/reconciliation-tool/https://tehan-wijeratne.web.app/writing/reconciliation-tool/A prototype that compares two reports in your browser, with nothing to install and nothing uploaded.Sat, 31 Oct 2026 00:00:00 GMTI broke a model on purposehttps://tehan-wijeratne.web.app/writing/leakage/https://tehan-wijeratne.web.app/writing/leakage/An experiment on data leakage, honest evaluation and a split-first pipeline.Sat, 31 Oct 2026 00:00:00 GMTWhat Leading About 1,200 Leo Members Taught Mehttps://tehan-wijeratne.web.app/writing/leo/https://tehan-wijeratne.web.app/writing/leo/Reflections on community, feedback, and leading without a fancy title.Sat, 31 Oct 2026 00:00:00 GMTHome-Cooked Toolshttps://tehan-wijeratne.web.app/writing/personal-software/https://tehan-wijeratne.web.app/writing/personal-software/Why everyone should build one small tool for their own work.How to Escalatehttps://tehan-wijeratne.web.app/writing/escalation/https://tehan-wijeratne.web.app/writing/escalation/Notes on raising issues early, clearly, and kindly.Process Documentationhttps://tehan-wijeratne.web.app/writing/process-docs/https://tehan-wijeratne.web.app/writing/process-docs/How to write process docs people actually use.Student Leadershiphttps://tehan-wijeratne.web.app/writing/leadership/https://tehan-wijeratne.web.app/writing/leadership/What I learned running a club, and how it maps to everything else.Things I Believehttps://tehan-wijeratne.web.app/writing/beliefs/https://tehan-wijeratne.web.app/writing/beliefs/The principles I try to work by.Understanding Machine Learninghttps://tehan-wijeratne.web.app/writing/ml/https://tehan-wijeratne.web.app/writing/ml/A beginner's overview, using a shellfish dataset.