Posts on programming, trading and analytics. Zola 2025-06-03T00:00:00+00:00 https://jozefrudy.com/atom.xml 2025-06-03T00:00:00+00:00 2025-06-03T00:00:00+00:00 Unknown https://jozefrudy.com/intellisense-search-codemirror/

<p>If you are reading this then most probably you are a developer and most probably you have experience with IDEs. IDEs have become indispensible for developers, where smart intellisense suggestions simplify your life. I wanted that same magic for my web app’s search functionality. Here’s how I built an intelligent search system using CodeMirror on the frontend and F# doing the heavy lifting on the backend.</p> <h2 id="the-problem">The Problem</h2> <p>I wanted users to filter cryptocurrencies using natural language like <code>name:Bitcoin marketCap&gt;1B OR ticker:ETH</code>. I wanted search to be smart enough to suggest completions, highlight syntax errors, and handle complex queries without breaking.</p> <p>After few iterations I arrived at the reasonable model. Keep minimal logic with syntax highlighting based on codemirror on frontend, and use F# where it shines, for both intellisense and expression translation into AST.</p> <p><code>Codemirror</code> is my favourite go-to editor, which is heavily customizable and browser-based. You could compare it to <code>vscode</code>, which is very heavy and you would have a hard time customizing it into a single line text-like field.</p>

2025-04-29T00:00:00+00:00 2025-04-29T00:00:00+00:00 Unknown https://jozefrudy.com/helix/

<p>I had been using <code>helix</code> for around a year before I finally switched from <code>rider</code> to <code>helix</code> for F# programming. Initially, I used <code>helix</code> only for editing custom text files without any Language Server Protocols (LSPs).</p> <p>Then I discovered how easy it is to set up LSP for virtually any text format you can think of, such as <code>docker compose</code>, <code>json</code>, <code>yaml</code>, <code>markdown</code>, or even <code>english grammar</code>.</p> <p>And that’s not even mentioning LSPs for programming languages—I now wonder how I could have lived without them before.</p> <p><img src="https://jozefrudy.com/helix/helix.webp" alt="helix" /></p>

2025-04-02T00:00:00+00:00 2025-04-02T00:00:00+00:00 Unknown https://jozefrudy.com/return-aggregation/

<p>Log returns are a very useful concept when working with timeseries. It turns out given statement is even more true when working with time-series database and materialized views in <strong>clickhouse</strong>.</p> <p><img src="https://jozefrudy.com/return-aggregation/log_returns.webp" alt="log_returns" /></p>

2025-03-12T00:00:00+00:00 2025-03-12T00:00:00+00:00 Unknown https://jozefrudy.com/parsing/

<p>I will describe here how in <strong>CryptoQuant</strong> I architected parsing user-input trading rules into a machine runnable AST. Parser source is available at <a rel="external" href="https://github.com/jozefRudy/trading-rule-parser">github.com/jozefRudy/trading-rule-parser</a>.</p> <p>This parsing system forms the critical bridge between human-readable trading strategies and executable code that can efficiently process market data - ultimately allowing our users to automate sophisticated trading strategies without requiring deep programming expertise.</p> <p><img src="https://jozefrudy.com/parsing/parsing.webp" alt="parsing" /></p>

2025-02-22T00:00:00+00:00 2025-02-22T00:00:00+00:00 Unknown https://jozefrudy.com/architecture/

<p><strong>CryptoQuant</strong> is basically one person startup, hence, the architectural choices made need to be pragmatic.</p> <p><img src="https://jozefrudy.com/architecture/builder.webp" alt="builder" /></p>