Projects — Nguyễn Đăng Khoa

Component Library & Design Tokens

2025

B2B SaaSunder NDA

A themeable component library that let independent teams ship consistent UI without coordinating releases.

archFramework-agnostic web components · tokens compiled from one JSON source to CSS/iOS/Android

roleLead engineer · set the API conventions and the adoption path

impact48 components · adopted by 6 product teams

TypeScriptWeb ComponentsStorybook

CI Telemetry Pipeline

2025

Personal project

Real-time build telemetry that finds slow and unreliable steps before they block a release.

archEvent ingest → columnar store → rollup queries · flake detection over rolling windows

roleSole author, design through operation

impact2M events/day · surfaced flaky tests that cut build time 38%

GoClickHouseGrafana

Payments Reconciliation Engine

2024

Financial servicesunder NDA

Automated a month-end reconciliation process that previously occupied two analysts for three days.

archScheduled DAG · idempotent matching across multiple provider feeds · exception queue for human review

roleDesigned the matching model and owned the rollout

impact1.4M transactions/cycle · 3 days of manual work → 20 minutes

PythonPostgresAirflow

Headless Content Platform

2024

B2B SaaSunder NDA

Let one editorial team serve a dozen markets without a separate CMS per region.

archHeadless CMS · one editorial workspace fanning out to many regional front-ends · per-market publishing rules

rolePlatform lead · content model, publishing rules, front-end integration

impact12 regional sites · 4 languages from a single workspace

JavaMagnoliaReact

Local-First Analytics Notebook

2023

Personal project

Query CSV and Parquet files in the browser without uploading anything anywhere.

archIn-process OLAP engine compiled to WASM · query execution entirely client-side, no server round-trip

roleSole author

impact10GB local datasets · zero network calls by design

RustDuckDBSvelte

Offline-First Field Data Capture

2023

Non-profit

Data collection for volunteers working in places where a network connection is not a given.

archLocal SQLite as source of truth · opportunistic sync with conflict resolution on reconnect

roleSole mobile engineer

impact200+ field users · fully functional with no connectivity

React NativeExpoSQLite

Event Router

2022

Financial servicesunder NDA

Fans internal state changes out to downstream consumers with replay when a consumer falls behind.

archEvent-driven · 3 services · at-least-once delivery with replay from offset

roleSole backend engineer on the service

impact800 msg/s sustained · 99.97% uptime over 14 months

KotlinKafkaKubernetes

Contrast-Checking Palette Tool

2022

Open source

Builds a palette while continuously verifying every foreground/background pair stays accessible.

archPairwise WCAG contrast computed on every drag · no build step, runs entirely in the browser

roleSole author

impactChecks every colour pair against AA and AAA in real time

JavaScriptCanvasWASM

Risk Exposure Dashboard

2021

Financial servicesunder NDA

Replaced an overnight batch report with a live view that traders actually kept open all day.

archStreaming aggregation replacing a nightly batch · incremental recompute on position change

roleBackend and data modelling

impactNightly report → live view · used daily by 12 desks

PythonpandasFastAPI