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Writing on GPUs, LLMs, MLOps, Kubernetes — and mindset · 3517 posts
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Designing a Deposit Interest Calculation Engine — From Day-Count Math to Preferential Rates
A practitioner-oriented design of a deposit interest calculation engine. We cover day-count conventions and their traps, simple and compound interest implementations, a preferential rate rule engine, withholding tax, rat
2026-06-13 · 18 min read #interest#core-banking#deposit#bigdecimal#bankingBank Deposit System Architecture — Dissecting the Heart of Core Banking
A deep dive into the deposit system at the heart of core banking. We cover account ledger design, deposit and withdrawal transaction processing, concurrency control, and how end-of-day closing coexists with 24x7 operatio
2026-06-13 · 19 min read #core-banking#deposit#ledger#architecture#bankingTrading Back Office and Settlement Systems — The Data Journey Across Front, Middle, and Back
Follow a single trade through its full data journey from order to execution, clearing, and settlement. We map FO/MO/BO systems, position and PnL management, confirmation and reconciliation, DVP settlement, Korean market
2026-06-13 · 17 min read #back-office#settlement#trading#capital-markets#reconciliationLending Systems and the LOS — Architecture from Loan Application to Disbursement
A deep dive into the overall architecture of lending systems at banks, card issuers, and capital companies, centered on the LOS (Loan Origination System). We walk through the pipeline from application to underwriting, ap
2026-06-13 · 19 min read #lending#los#loan-origination#core-banking#fintechBatch and End-of-Day Processing in Banking — The Architecture That Rules the Night
Why batch processing remains central in banking and the full picture of end-of-day (EOD) processing. We cover job schedulers and dependency DAGs, checkpoint restarts, partitioning and chunk processing, center-cut and dat
2026-06-13 · 18 min read #finance#batch#eod#spring-batch#schedulerCore Banking Modernization Strategy — From Mainframe to Cloud Native
A comparative analysis of strategies for modernizing legacy core banking. We cover big-bang rebuilds versus incremental strangler patterns, core decomposition, the cloud-native core banking wave, the Korean regulatory en
2026-06-13 · 23 min read #core-banking#modernization#cloud#mainframe#migrationLoan Servicing Systems — The Data Flow of Delinquency, Provisions, and NPL
A tour of the world after loan disbursement. We cover repayment schedule generation (equal installment, equal principal, bullet), payment and prepayment processing, delinquency bucket transitions and overdue interest cal
2026-06-13 · 26 min read #lending#loan-servicing#delinquency#npl#ifrs9Investment Banking Systems Architecture — From Deal Pipeline to Syndication
A systems-eye dissection of the investment banking domain. We cover deal pipelines, conflict checks, the technical implementation of Chinese walls, bookbuilding and allocation logic, syndicated loan administration, and M
2026-06-13 · 20 min read #investment-banking#capital-markets#system-design#compliance#workflowDesigning a Credit Scoring System (CSS) — From Scorecards to ML Underwriting
A deep dive into the CSS (Credit Scoring System), the brain of loan underwriting. We cover application vs behavior scores, WoE/IV-based scorecard development, the regulatory comparison between logistic regression and ML
2026-06-13 · 16 min read #credit-scoring#css#risk-management#machine-learning#scorecardBanking Ledger Design — Double-Entry Bookkeeping, Event Sourcing, and Consistency Down to the Last Cent
How to design the ledger at the heart of a banking system. We cover double-entry principles, the journal and posting data model, balance computation strategies, event sourcing, hot-account concurrency control, idempotenc
2026-06-13 · 17 min read #finance#ledger#double-entry#event-sourcing#core-bankingBackstage Scaffolder — Turning Golden Paths into Code
How to codify golden paths with the Backstage Scaffolder. Covers a full template.yaml dissection, built-in actions and Nunjucks templating, custom action development, injecting organizational standards into skeletons, te
2026-06-13 · 14 min read #backstage#scaffolder#golden-path#platform-engineering#devopsBackstage in Production — TechDocs, Plugin Development, and the Production Checklist
Part 3 of the Backstage IDP series. Covers the docs-as-code pipeline with TechDocs and S3 publishing, frontend/backend plugin architecture and custom plugin development, the permission framework, upgrade strategy, and pe
2026-06-13 · 14 min read #backstage#techdocs#plugins#platform-engineering#devopsPlatform Engineering in Banking — The Marriage of Backstage and Governance
What platform engineering offers in a banking environment where approvals and security procedures stretch lead times to weeks. Covers Backstage golden paths with regulatory requirements built in, Scaffolder actions wired
2026-06-13 · 16 min read #devops#platform-engineering#backstage#finance#governanceBuilding an IDP with Backstage Part 1 — The Software Catalog Is Everything
A deep dive into the software catalog, the foundation of any Backstage-based Internal Developer Portal. Covers the entity data model, practical catalog-info.yaml authoring, GitHub auto-discovery, the ownership model, met
2026-06-13 · 15 min read #backstage#idp#platform-engineering#devops#software-catalogHubble and ClusterMesh — Cilium Observability and Multi-Cluster Operations
Covers the architecture of Hubble, the observability layer of Cilium, with practical CLI queries, Prometheus metrics, and long-term flow log retention, then walks through configuring ClusterMesh for multi-cluster service
2026-06-13 · 13 min read #cilium#hubble#clustermesh#observability#multi-clusterCilium Datapath Architecture — Inside a Cluster Without kube-proxy
A deep dive into the eBPF datapath of Cilium, the CNCF graduated CNI, following a packet on its journey. We cover how kube-proxy replacement works, the identity-based security model, tunneling versus native routing, and
2026-06-13 · 16 min read #cilium#ebpf#kubernetes#cni#networkingCilium Network Policy in Practice — Zero Trust from L3 to L7 and DNS
A hands-on guide to going beyond the limits of Kubernetes NetworkPolicy with CiliumNetworkPolicy, controlling L3/L4/L7 and DNS-based egress. Covers a four-stage default-deny rollout roadmap, a Hubble-driven policy author
2026-06-13 · 14 min read #cilium#network-policy#zero-trust#kubernetes#securityHow Git Actually Stores Your Data
Most of us use Git every day without knowing what its insides look like. A ground-up tour of the object model (blob, tree, commit, tag), content addressing by SHA hash, the commit DAG, the fact that branches are just poi
2026-06-13 · 14 min read #git#version-control#fundamentalsA Deep Dive into apple/container — The Lightweight VM Approach to macOS Containers
We examine the limits of Docker Desktop and its single shared Linux VM on macOS, then analyze the one-VM-per-container model adopted by apple/container. The post covers the Container Machine feature unveiled at WWDC26, a
2026-06-12 · 19 min read #apple-container#virtualization#macos#docker#containerLocal LLM Inference Optimization — From Quantization to Breaking the VRAM Ceiling
Privacy concerns, cost pressure, and big-tech fatigue are driving a local LLM revival. We map the entire landscape of local inference optimization: VRAM-first hardware thinking, GGUF and AWQ quantization, llama.cpp vs vL
2026-06-12 · 16 min read #llm#inference#quantization#llama-cpp#vllm