Product · New
What Do You Actually Sell? — eight kinds of value
AI means a solo founder can build what once took a whole startup. So the hard part isn't building anymore — it's knowing what value you'd actually sell. That question became Almanack.
“Founders rarely quit from failure — they quit from success that isn't meaningful enough.”
Tản văn · Mới nhất
Tập viết — viết để hiểu, để vui, để cho đi
Đọc Paul Graham xong tôi rất muốn viết. Ba lý do để viết, ghi lại vào một buổi trưa thứ Bảy giữa đại dự án thay lõi giao dịch ngân hàng.
“Không viết ra được, đơn giản là chưa hiểu.”
Field notes · Data Engineering
Less I/O — a mental model for data pipeline optimization
A field-notes essay: nearly every pipeline optimization you reach for — partition pruning, columnar formats, SIMD, data locality, the page cache, the CPU hierarchy — is one idea wearing different hats. Move and store less data. With Hadoop, SIMD, Parquet (encoding, compression, page index, Z-order), ClickHouse types, a banking data model, and a Spark driver-OOM that turned on this exact principle.
"The cheapest byte to process is the one you never had to move. Tools change every year; principles like this barely move in a decade."
Study notes · Data Modeling
Banking Data Models — 12 Approaches, 4 Eras
A learning-in-public post: I worked through every major approach to modeling banking data — from Inmon's CIF and Kimball's dimensional model through BIAN, ISO 20022, FIBO, Data Vault, Lakehouse Medallion, Data Mesh, Activity Schema, and the AI-native hybrids of 2024+. With diagrams, trade-offs, and a decision tree.
"My takeaway from the reading: no holy grail. Each approach does one thing well — the question is composing them right."
Side project · Audio engineering
DQ-DSP
Couldn't get a $200 miniDSP shipped to Vietnam, so I built one for $20. An ESP32-S3 plus two cheap I²S DACs that drive my DIY 2-way active speakers and tune live from any Chrome tab. Open-source firmware + UI, GPLv3.
"miniDSP wants $200. Mine costs $5 and a few weekends. Sounds great, runs forever, fits in a tin."
Data Solution Architect · VIB
I build data systems
that ship.
Data platforms by day. Focused side projects by night.
Engineering software since 2015.
> Currently: modernizing legacy warehouses into cloud lakehouses at VIB.
What I do
Data Architecture
data platform
AWS Lakehouse, Databricks, cloud migrations. Designing data platforms for retail banking since 2021.
Full-stack Dev
full-stack
Next.js, Go, Python. Shipping complete products and maintaining them properly.
Side Projects
product
Tools for real users. Offline-first, mobile-first, built to last.
> Thanks for reading this far.