cjjutba
(Blog)

Notes & build logs.

Writing in public about product engineering, AI-native workflows, and what I'm building.

A monochrome editorial diagram of a five-stage cycle - brainstorm, spec, plan, execute, verify - connected by arrows, with a small review-gate checkbox on each step.
Latest

From idea to shipped: my AI-native engineering workflow

Typing was never the bottleneck. I ship fast by compressing the loop between an idea and verified, reviewed code - with spec-driven planning, parallel agents, and verification gates - not by generating more code faster.

May 28, 2026 · 12 min read
A monochrome editorial diagram of a compliance-grade SaaS: three role-scoped tenant panels, a role-by-permission RBAC matrix, and an append-only audit trail above a compliance-assurance footer.

Engineering a compliance-grade SaaS: multi-tenancy, RBAC, and audit trails

How I replaced a Belgian accounting practice's email-and-spreadsheet workflow with one type-safe API serving three role-scoped portals - a full Belgian AML compliance module, 92+ RBAC permissions, and an append-only audit trail underneath.

May 22, 2026 · 14 min read
A monochrome editorial diagram of an explainable hiring score: a large score figure broken out into weighted factors - skills, experience, relevance, consistency, communication, portfolio - noting no protected attributes are used.

Designing AI you can defend: explainability and fairness in AuraHire

When an AI scores a person for a job, a number is not enough. Here is how I built AuraHire so every score shows its work, every resume is redacted before scoring, and every decision is replayable.

May 15, 2026 · 13 min read
A monochrome design-system specimen: warm-paper and ink colour swatches with a hairline rule, and the three typefaces - serif display, sans body, mono label - each shown as a large 'Aa'.

Build log: shipping this site with Next.js 16, Tailwind v4, and a monochrome design system

How cjjutba.com is put together - a no-radius monochrome design system, Next.js 16's sharp edges, two modals that share one pattern, and a content-as-data model with zero MDX. The post you're reading is the page it describes.

May 10, 2026 · 11 min read
Open to work

Have a project in mind? Let's build it.

I'm available for freelance projects, and open to the right full-time role.

I build web apps, SaaS, and MVPs for founders and startups. Tell me what you're working on.