Hi, I'm Bart Hazen and I'm behind NimbleFlux

Freelance Data Platform & MLOps Engineer

I write about things I learn while building software - engineering, infrastructure, DevOps, AI, and the products I create along the way.

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GlucoseSync: An Open-Source CGM Companion for Android and Wear OS

When sensor vendors don't build watch apps, diabetics are stuck pulling out their phone. That's why I built GlucoseSync, a free and open-source CGM companion for Android and Wear OS with complications, configurable history charts, alerts, and pump data. Because this kind of technology should be available to everyone.

AndroidWear OSOpen Source+2

June 15, 20265 min readRead →

ClickLens query fingerprints view showing grouped queries with aggregated performance statistics and trend analysis

ClickLens: Debugging ClickHouse Queries Without the Pain

A single-binary web app for analyzing ClickHouse query performance. Flame graphs, thread breakdowns, query fingerprints, cluster ops monitoring, and table optimization. Built because the built-in tools weren't enough.

ClickHouseOpen SourceSelf-Hosting+1

May 29, 20266 min readRead →

Multi-tenant architecture diagram showing Main Database with FDW connections to isolated tenant databases, protected by Row Level Security

Multi-Tenancy with postgres_fdw: How Fluxbase Isolates Tenant Data

How I added multi-tenant isolation to Fluxbase using PostgreSQL's Foreign Data Wrapper, Row Level Security, and a hybrid database architecture, without breaking backward compatibility.

FluxbasePostgreSQLArchitecture+1

May 25, 20268 min readRead →