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Practitioner notes · AI applied to finance & operations

Jewel Nguyen

An operator who builds — turning back-office problems into systems that run themselves.
Reading Desk · AI-curated

The AI writing worth your time.

More is written about AI every day than anyone can read. I put AI to work on its own field — it sifts what's being written about building with AI, keeps the few pieces that hold up, and I share them here, synthesized and de-hyped.

Deep read · July 18, 2026
source · July 17, 2026

Why are some AI companies hitting $10M ARR in six months?

Some AI-infrastructure startups reach $10M+ in annual revenue within six months, and the essay's answer for how isn't a better product. It's who they sell to: the handful of AI-native companies operat

Deep read · July 17, 2026
source · July 16, 2026

The Self-Driving Company

What changes when a company stops treating AI agents as a tool you open in the code editor and starts wiring them into every job — engineering, data, sales, support? One software company published six

Deep read · July 15, 2026
source · July 14, 2026

The first experimental evidence of recursive self-improvement (AIDE²)

Can an AI improve the very scaffolding that runs it — the search strategy, the memory, the self-checks — without a human tuning any of it? A research team claims the first measured 'yes': a system tha

Deep read · July 14, 2026
source · July 12, 2026

Own The Data Loop

The competitive edge in AI has moved twice. First it was the model, then the harness wrapped around the model, and now the argument is that it is neither — it is the data you compound on top of both.

Deep read · July 13, 2026
source · July 12, 2026

The Reverse Information Paradox

There is a classic problem in the market for information: a seller must reveal the idea to sell it, and once revealed it has been given away free. The argument here is that AI flips that risk onto the

Deep read · July 11, 2026
source · July 8, 2026

Building an AI from the ground up, one vector at a time

The piece builds a working AI from the ground up on one thesis: everything becomes a vector, and learning is nudging numbers until the machine stops being wrong. It walks the full chain in order — emb

Deep read · July 10, 2026
source · July 2, 2026

Why AI-built iOS apps look AI-built — and the design pass that fixes it

The argument: users judge an app in about a second, and most AI-built apps fail that gut-call because they look AI-built — default fonts, the same purple gradient, spacing slightly off. That is a desi

Deep read · July 8, 2026
source · July 6, 2026

Getting started with loops

The Claude Code team's own post pins down what an agent 'loop' is and sorts loops into four types by which piece of your judgment you hand off: the check (turn-based), the stop-condition (goal-based),

Deep read · July 6, 2026
source · July 3, 2026

Spec-Driven Development was always BS

One argument doing the rounds is that writing a full spec up front never really worked — waterfall lost to agile because teams discover what they actually need while building, not in a document writte

Deep read · July 5, 2026
source · July 2, 2026

A four-layer memory architecture for agents that stay useful for months

The thing that makes an AI agent genuinely useful over months isn't the model or the tools — it's how you file what it remembers. The argument here is that durable agent memory is an infrastructure pr

Deep read · July 4, 2026
source · July 1, 2026

20 Loop Design Patterns Every AI Engineer Should Know

The argument is that the current jump in AI quality is not coming from smarter models, it is coming from wrapping a model call in a loop: generate, evaluate, learn, improve, repeat. The piece sorts 20

Deep read · July 3, 2026
source · June 30, 2026

Reorganising folders by concern made one agent 10x faster

An agent kept burning nearly two minutes opening the wrong files to fetch a brief written three months earlier, and the fix wasn't a better model. The same wandering happened on Opus, GPT 5.5, Qwen an

Deep read · July 1, 2026
source · June 30, 2026

Company brains live or die on adoption, not architecture

A company brain — a shared, AI-readable memory of how an organisation actually works — lives or dies on adoption, not architecture. Drawn from 200-plus deployments, the piece argues the tech barely de

Deep read · June 29, 2026
source · June 27, 2026

Ten open-source add-ons for Claude Code, and how to vet the hype

The piece argues that out-of-the-box Claude Code uses a fraction of its capability, and the rest lives in open-source add-ons that bolt on memory, discipline and agent teams. Most of the hyped repos a

Deep read · June 28, 2026
source · June 26, 2026

Solving the AI Adoption Problem

Most enterprise AI pilots fail for one reason: they hand employees yet another tool to open, and adoption stalls at 25-30%. The fix the piece proposes is to stop selling an interface and start selling

Deep read · June 27, 2026
source · June 25, 2026

Migrating from Claude to DeepSeek

Lindy, a general-purpose AI assistant, moved most of its traffic off Claude and Gemini onto DeepSeek v4 Flash and cut the per-use model cost on those routes by about 90%. The real argument is that the

Deep read · June 26, 2026
source · June 24, 2026

The twenty things a production AI engineer is expected to know

The post is a 20-item list of what a production AI engineer should actually know, and its argument is that the job moved off 'writing good prompts' onto engineering the reliable system around the mode

Deep read · June 25, 2026
source · June 24, 2026

The Feynman Method: Why You Forget 90% of What You Read (And the 4 Prompts That Fix It)

The piece argues you forget most of what you read because reading feels like understanding when it's only recognition, and the fix is to retrieve the idea rather than re-read it. It packages Richard F

Deep read · June 24, 2026
source · June 20, 2026

Claude Code vs Codex — a verdict: plan with one, build with the other

Stop asking which coding AI is best and ask which one fits which job. One argument doing the rounds, after weeks of daily use, is that Claude Code (with Opus) and Codex (with GPT-5.5) have opposite st

Deep read · June 24, 2026
source · June 22, 2026

The NASA ABORT Method: How to Make Claude Kill Your Bad Ideas Before You Launch Them

The piece repackages two old, well-evidenced decision tools — Gary Klein's premortem (HBR 2007) and NASA's pre-launch Failure Review Board and Go/No-Go poll — into four copy-paste Claude prompts you r

Deep read · June 23, 2026
source · June 21, 2026

Evals: the strategic IP that will define the next era of AI

Most corporate AI stalls at the pilot stage for one blunt reason: nobody can say how good the AI actually is. The argument doing the rounds is an 'eval-first' mentality — treat your scored test suite

Deep read · June 21, 2026
source · May 8, 2026

Most retrieval failures start with the chunk, not the retriever

Almost every retrieval system inherits one unexamined assumption: that a chunk of text is the right thing to embed. The argument here is that this single choice causes most retrieval failures — the on

Deep read · June 18, 2026
source · June 17, 2026

What Anthropic actually open-sourced for finance — and what the viral post got wrong

A viral post claims a whole suite of finance tools — DCF and LBO models, equity research, KYC, NAV tie-outs — was just open-sourced as a free plugin, and that bank analysts are about to be replaced. T

Deep read · June 15, 2026
source · June 13, 2026

Autonomous Long-Running Coding Agents

Autonomous coding has shifted from 'better prompting' to 'better control systems' — the argument doing the rounds is that you wrap a model in a goal, an evaluator, a verifier, and a loop so it keeps w

skill supply chain · Post · July 6, 2026
source · June 27, 2026

A thread doing the rounds lists ten open-source add-ons you can bolt onto your AI to make it far more capable — thousands of stars between them…

outcomes-as-a-service · Post · July 6, 2026
source · June 26, 2026

An essay making the rounds argues enterprise AI is selling the wrong thing: nobody wants a tool to help them work, they want the work done — so stop…

AEO / getting cited · Post · July 6, 2026
source · June 29, 2026

A thread from someone who's spent 18 months doing AI SEO for B2B companies makes an unfashionable claim: most of the current gold rush — buy an 'AEO'…

AI adoption · Thread · July 6, 2026
source · June 30, 2026

A thread going round reports on 200 'company brain' AI rollouts — one builder set them up and wrote down what made them stick. The headline finding…

skill supply chain · Post · July 6, 2026 · source June 27, 2026

Popularity isn't safety

A thread doing the rounds lists ten open-source add-ons you can bolt onto your AI to make it far more capable — thousands of stars between them, one-line installs, a slick pitch. The message: grab these and go.

Here's what the pitch skips. A team of researchers scanned about 31,000 of these skills across the two biggest marketplaces. Roughly one in four carried a security vulnerability — data exfiltration and privilege escalation at the top of the list.

Read the number the way the researchers ask you to. They're explicit that 26% means 'patterns that warrant review,' not '26% are malicious' — it lumps genuine malice in with sloppy code and grey areas. A separate scan of one brand-new marketplace put actual malicious payloads nearer 17% in its first weeks. Either way the direction holds.

Anyone who's run supplier onboarding already has the reflex. You don't wire a new vendor into your payments run because the website looks good and the logo wall is long. You check who they are, what they can touch, and what happens if they misbehave.

A skill is a vendor. Except this one you're handing read-and-write access to your files.

So the keeper isn't 'avoid the marketplace.' It's: test it on something throwaway before it touches real work, read what it actually does, and treat a high star count as marketing, not a clean bill of health. Would you approve this supplier if it were a person?

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outcomes-as-a-service · Post · July 6, 2026 · source June 26, 2026

Sell the brakes, not the autonomy

An essay making the rounds argues enterprise AI is selling the wrong thing: nobody wants a tool to help them work, they want the work done — so stop selling an interface, sell the finished outcome, and let the agent run in the background.

It's a vendor essay, so the numbers arrive pre-loaded. A tidy '25–30% adoption ceiling' that I couldn't source anywhere outside the pitch itself. The figure that does hold up is uglier: MIT found 95% of enterprise AI pilots delivered no measurable return, largely because the tool sat in a window nobody opened.

Strip the sales gloss and one idea earns its place. The bit they call a 'control plane' — where the owner can pause the agent, pull it back, approve what it changes — is the actual product. Not the automation. The brakes.

Finance has a name for this, and it's a century old. You don't let the person who books the entry also sign it off. An agent working unwatched inside your system of record is an unsegregated process with better branding.

Build the pause button before you build the autonomy. What would you most want to be able to stop?

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AEO / getting cited · Post · July 6, 2026 · source June 29, 2026

A formatting fix for a positioning problem

A thread from someone who's spent 18 months doing AI SEO for B2B companies makes an unfashionable claim: most of the current gold rush — buy an 'AEO' tool, write an llms.txt file, chunk your paragraphs just so — is fixing the wrong thing.

You don't have a formatting problem, he says. You have a positioning one. An AI won't recommend you into a category the market doesn't agree you belong in — and no amount of clean markup fixes a brand that's filed under the wrong league.

His mechanism is one every finance team already runs under a different name. You get picked when your site, your customers, and independent third parties all tell the same story about where you belong. That's four-eyes: the same claim confirmed by sources that don't depend on each other. When they agree, the model's confidence rises and it names you. When they drift, you're a coin toss.

The keeper reorders the whole to-do list. Structure earns you eligibility — the AI can lift a well-built page. Positioning earns you the pick. One is a template you apply in an afternoon. The other is a year of being consistent about who you are.

Which one have you actually done?

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AI adoption · Thread · July 6, 2026 · source June 30, 2026

Adoption beats architecture

A thread going round reports on 200 'company brain' AI rollouts — one builder set them up and wrote down what made them stick. The headline finding: almost none of it was the architecture. What predicted success was temperament. The people who won could 'tolerate ambiguity and keep moving.'

That's exactly the instinct I've spent years in finance training myself out of, so I read the rest closely. The engineers did worst. They asked all the right questions — where does the context live, what if two files disagree, how are permissions enforced — and then questioned themselves into paralysis. They wanted guarantees from a system that doesn't hand them out.

The less-technical users just started. Draft the email, fix the tone, upload the thread that was missing, judge whether it helped, repeat. Closer to onboarding a new hire than configuring a database. You correct it into usefulness. You don't design it into usefulness first.

This isn't only vibes. MIT's 2025 study of enterprise AI found 95% of pilots delivered no measurable P&L — and the reason the authors give is that the tools couldn't retain feedback or adapt. Not model choice. Adoption and correction were the gap.

The catch, and it's a real one: 'move fast, mistakes are reversible' has a hard edge. With client or regulated data, some mistakes don't reverse. The speed has to stop at that wall, every time.

So I've split the rule by layer. Using the system: keep moving, correct later. Changing its structure: prove the scope first. Where's your own line between the two?

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Dossier · July 16, 2026

Local & Alternative Models

A real shift is underway: the tier just below the best AI models — mostly open-weight releases like GLM-5.2, Kimi, DeepSeek and MiniMax — has caught up to within a few points on the tasks that matter,

Dossier · July 9, 2026

Local & Alternative Models

The frontier is no longer a single model you subscribe to — it's a swappable backend you route to, and most routine work now runs on a tier that costs 5–12× less, provided you treat the swap as an eva