Technical Insights & Articles
Engineering insights from modernizing established software, building reliable systems, and developing tools for scientific computing.
November 1, 2026 • Viliam Simko
One Rust Core, Multiple Platforms: What WebAssembly Makes Possible
How one Rust codebase can power native software and the browser, what WebAssembly costs, and what real-world size measurements can teach us.
November 1, 2026 • Viliam Simko
WASM It Worth It? Calling Rust from R
V8, Wasmtime, and native Rust take three different routes from R to the same Rust core. We benchmark the trade-offs in speed and runtime footprint.
October 30, 2026 • Viliam Simko
Beyond corrplot: Rethinking Correlation Visualization for the Next Decade
How can corrplot keep serving its R users while opening the door to new ways of exploring correlation matrices?
October 30, 2026 • Viliam Simko
What corrplot-ng Needs to Solve
The practical challenges of making corrplot usable from R, Python, web projects, and a standalone command-line tool.
October 30, 2026 • Viliam Simko
Can Rust Make corrplot Faster? A Cross-Language Benchmark
An experimental comparison of Python, pure R, C++/Rcpp, and Rust/rextendr for building the same corrplot-ng scene and encoding it as JSON.
October 1, 2026 • Viliam Simko
How to Build an MCP Server in JavaScript: A Practical Step-by-Step Guide
A practical, beginner-friendly guide to building an MCP server in JavaScript and Node.js with the MCP TypeScript SDK v2, Zod, stdio, MCP Inspector, and modern MCP architecture.
October 1, 2026 • Viliam Simko
From GitLab Duo to Junie: Building an OpenAI-Compatible LLM Adapter
Building an OpenAI-compatible adapter for GitLab Duo's GraphQL API to enable JetBrains Junie CLI in enterprise-restricted environments.
December 18, 2022 • Viliam Simko
Working with Nested JSON Data in Apache Spark
A practical guide to working with nested data in Apache Spark, using to_json and from_json, JDBC, and Spark-native transformations.
December 10, 2022 • Viliam Simko
How to Make Joins in Spark Dataset API More Type-Safe
How to make outer joins in Apache Spark's Dataset API more type-safe using Scala extension methods and Option-aware join results.
December 10, 2022 • Viliam Simko
Best Way to Enforce Type-Safety at Runtime in TypeScript
A practical guide to enforcing TypeScript type safety at runtime using type guards, the parse-don't-validate approach, and Zod.
June 1, 2022 • Viliam Simko
Using Enumerations with Apache Spark
A practical comparison of Scala Enumeration, sealed traits, Enumeratum and Java enums when working with Apache Spark Dataset API.
October 15, 2020 • Viliam Simko
GraphQL quick-and-dirty
A personal retrospective on GraphQL's flexibility, REST's simplicity, and the API design trade-offs I first explored in 2020—and reconsider today.
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