Volodymyr Gaevoy 🇺🇦

c#/js dev, security engineer, azure cloud engineer.
Father, traveler, bicyclist, prog metal fun. Credo: make implicit explicit.

[Andrej Karpathy @karpathy]

LLM Knowledge Bases

Something I'm finding very useful recently: using LLMs to build personal knowledge bases for various topics of research interest. In this way, a large fraction of my recent token throughput is going less into manipulating code, and more into manipulating knowledge (stored as markdown and images). The latest LLMs are quite good at it. So:

Data ingest:
I index source documents (articles, papers, repos, datasets, images, etc.) into a raw/ directory, then I use an LLM to incrementally "compile" a wiki, which is just a collection of .md files in a directory structure. The wiki includes summaries of all the data in raw/, backlinks, and then it categorizes data into concepts, writes articles for them, and links them all. To convert web articles into .md files I like to use the Obsidian Web Clipper extension, and then I also use a hotkey to download all the related images to local so that my LLM can easily reference them.

IDE:
I use Obsidian as the IDE "frontend" where I can view the raw data, the the compiled wiki, and the derived visualizations. Important to note that the LLM writes and maintains all of the data of the wiki, I rarely touch it directly. I've played with a few Obsidian plugins to render and view data in other ways (e.g. Marp for slides).

Q&A:
Where things get interesting is that once your wiki is big enough (e.g. mine on some recent research is ~100 articles and ~400K words), you can ask your LLM agent all kinds of complex questions against the wiki, and it will go off, research the answers, etc. I thought I had to reach for fancy RAG, but the LLM has been pretty good about auto-maintaining index files and brief summaries of all the documents and it reads all the important related data fairly easily at this ~small scale.

Output:
Instead of getting answers in text/terminal, I like to have it render markdown files for me, or slide shows (Marp format), or matplotlib images, all of which I then view again in Obsidian. You can imagine many other visual output formats depending on the query. Often, I end up "filing" the outputs back into the wiki to enhance it for further queries. So my own explorations and queries always "add up" in the knowledge base.

Linting:
I've run some LLM "health checks" over the wiki to e.g. find inconsistent data, impute missing data (with web searchers), find interesting connections for new article candidates, etc., to incrementally clean up the wiki and enhance its overall data integrity. The LLMs are quite good at suggesting further questions to ask and look into.

Extra tools:
I find myself developing additional tools to process the data, e.g. I vibe coded a small and naive search engine over the wiki, which I both use directly (in a web ui), but more often I want to hand it off to an LLM via CLI as a tool for larger queries.

Further explorations:
As the repo grows, the natural desire is to also think about synthetic data generation + finetuning to have your LLM "know" the data in its weights instead of just context windows.

TLDR: raw data from a given number of sources is collected, then compiled by an LLM into a .md wiki, then operated on by various CLIs by the LLM to do Q&A and to incrementally enhance the wiki, and all of it viewable in Obsidian. You rarely ever write or edit the wiki manually, it's the domain of the LLM. I think there is room here for an incredible new product instead of a hacky collection of scripts.

[pashov @pashov]

🚨Claude Opus 4.6 wrote vulnerable code, leading to a smart contract exploit with $1.78M loss

cbETH asset's price was set to $1.12 instead of ~$2,200. The PRs of the project show commits were co-authored by Claude - Is this the first hack of vibe-coded Solidity code?

[James Montemagno @JamesMontemagno]

Announcing PDF Diff - Compare PDFs privately and securely locally in your browser!

https://t.co/c9xroMqgnV

[Wiesław Šoltés @wieslawsoltes]

Goodby bash and long live C#

[Volodymyr Gaevoy 🇺🇦 @vgman]

Just found out about #SimpleLogin - a super handy way to protect your real email.

* Open source
* Create email aliases for every site
* Disable if spammy
* Works with custom domains
* Reply from aliases too
* Owned by #ProtonMail

#EmailSecurity #SpamProtection

[Volodymyr Gaevoy 🇺🇦 @vgman]

Rancher Desktop = Docker Desktop, but free + open source
No licensing.
Built-in Kubernetes.
Runs on WSL2.

You really should try it.

#docker #k8s #opensource #rancherdesktop #developers

[Volodymyr Gaevoy 🇺🇦 @vgman]

New project? New stack? Feeling like an intern again? What I’ve learned:

1. Frameworks fade, fundamentals last
2. Fast learners -> know-it-alls
3. Be useful in many areas
4. Ask early, write often
5. Read the docs before breaking prod

Full post on LinkedIn

[Volodymyr Gaevoy 🇺🇦 @vgman]

Angular's signals feature gives me major KnockoutJS nostalgia!

In 2010: ko.computed(() => firstName() + " " + lastName());

In 2025: computed(() => firstName() + " " + lastName());

Same reactive magic, modern package. Everything old is new again!
#Angular #KnockoutJS #WebDev

[Volodymyr Gaevoy 🇺🇦 @vgman]

Just found #DeltaChat – a #chat app that uses your #email for #E2E encrypted messaging.

No central server

Keys never leave your device

Uses #Autocrypt (#OpenPGP)

No new account needed

Feels like #Signal, runs on email

https://t.co/9xr8BzpJtW

[Volodymyr Gaevoy 🇺🇦 @vgman]

Just found a nice dev tool: https://t.co/YeEgRebXzt

Take a curl command (from Chrome DevTools, right-click → Copy as cURL) and instantly convert it into Python, JS, C#, PowerShell, or even an .http file.

Super clutch for API work.

#devtools #curl #api #webdev

[Volodymyr Gaevoy 🇺🇦 @vgman]

🎙️ Using Google NotebookLM to create AI podcasts!

Upload research → Generate scripts → Convert to audio → Customize voices = the perfect learning companion for commuting. Turn research into audio content on-the-go!

#AIContent #NotebookLM

[Volodymyr Gaevoy 🇺🇦 @vgman]

#introvert + #ChatGPT = dream team

[Volodymyr Gaevoy 🇺🇦 @vgman]

Where does #techdebt come from? #quickfix #hack #workaround

[Volodymyr Gaevoy 🇺🇦 @vgman]

Still on .NET Framework? Got something cool for you!

Wrote a guide on using C# 12 features in old .NET Framework projects - no upgrade needed!

Use #PolySharp to write modern C# in legacy apps.

Check it out: https://t.co/DIjnEU3m8n

#dotnet #csharp #dotnetfx #csharp12

[Dmitrii Kovanikov @ChShersh]

OOP Design Patterns is a scam.

All you need is functions.

[Dave Callan | dotnet @Dave_DotNet]

There's a huge abstraction fetish in #dotnet I've found.

In a system I worked on in the not too distant past, I estimated I could remove 60-70% of the code AND the system would do the exact same thing. Full of abstractions, indirection, pass through layers, 'just in case' design approaches etc. It was similar to so many projects I've inherited (and sometimes wrote 🤦🏻‍♂️) in the past.

Devs literally use their organizations apps as their pattern playgrounds. Spending someone else's money is easy, but if devs were spending their own money, they might ask themselves is this abstraction really needed?

[Volodymyr Gaevoy 🇺🇦 @vgman]

@Aizkmusic If your answer is right, the captcha check considers you as a bot ;)

[Volodymyr Gaevoy 🇺🇦 @vgman]

@eliasnogueira Nostalgia washed over me 🤗

[Elias Nogueira 🇧🇷🇳🇱 @eliasnogueira]

Kids, this is how we deployed apps in monolith applications not too long ago...