Distributed systems that have to stay up. Most recently four years on a platform team building the data infrastructure behind cloud-native SaaS for telecom operators.

Before that: Spring Boot microservices handling 100M+ patient records for a top-3 US healthcare provider, and the core algorithms for a cross-border energy exchange connecting grid operators across six countries.

Scala (Cats, cats-effect, FS2, Akka, http4s, Monix) · Java 17 · Kafka · Kubernetes · Cassandra · Redis · AWS / Azure / GCP

None of what follows is commercial. It is unpaid engineering on problems I actually have — which is why most of it carries a real README, a CI pipeline and release binaries rather than a weekend of commits.

Control surfaces for OBS Studio, the open-source live-streaming program. Everything below drives it over obs-websocket 5.x, its built-in remote control protocol. The map at obs.worxbend.com shows how the pieces fit together.

AirGradient makes open-source indoor air-quality monitors that expose their readings on the local network. I wanted those readings everywhere I look, and none of it going through a cloud account — so the same local endpoint now drives five different clients.

They share one config file, so the CLI, the desktop app and the GNOME extension all point at the same device.

A camera pipeline built from the wire protocol up, because HTTP and WebSocket framing are more overhead than a microcontroller pushing JPEG frames needs.

• spycam — ESP32-CAM firmware. A camera task fills a single latest-frame slot; a sender task owns all network I/O and reconnects forever with exponential backoff. When the network falls behind, stale frames are dropped rather than queued.
• spycam-s3 — the same client for ESP32-S3 boards.
• instachron — the server side. A Go workspace of eight deployable services: the raw TCP receiver that republishes frames on a Unix socket, an HTTP API and web UI, restream proxies with image enhancement, upscaling and YOLOv8 object detection, an H.264 timelapse recorder, and an ffmpeg RTMP streamer.

The protocol is a long-lived raw TCP connection carrying repeated frames — a 16-byte big-endian header (magic, sequence number, payload length, camera timestamp) followed by exactly that many JPEG bytes. No HTTP, no delimiters, no text framing. It is documented precisely enough to write a receiver from scratch.

Also: led-matrix-controller (ESP8266 Wi-Fi TCP firmware driving a WS2812B 8×8 matrix), echo (a Go proxy turning webhooks into light shows on it), echoctl (Scala 3 CLI for that proxy), and deskctl (GTK4 controller for an ESP32-driven standing desk).

One YAML profile describing the machine you want, a plan you read before anything happens, then the parts that still need doing.

• fluxion — Java 25, GraalVM-native. Packages, Flatpaks, scripts, dotfiles, shell tooling, fonts and prebuilt binaries from one profile, with state recorded so reruns skip finished work.
• fluxion.cr — the Crystal implementation. CLI or TUI.
• binstaller — binary distributions from a declarative profile, with dry-run plans, SHA-256 verification and a lock file.
• nerd-fonts-installer — Go, checksum-verified downloads, interactive picker. On the Snap Store.
• dotbot-scala · dotbot-go — two implementations of the Dotbot dotfiles workflow, both shipping as single native binaries.
• system-bootstrap — multi-distro dotfiles and workstation setup for Fedora, Arch and openSUSE.

• scalacv — a Scala 3 API over OpenCV 4.13. Typed constants instead of magic integers (ColorConversion.BgrToGray, not 6); a Managed[A] that releases native handles exactly once and throws on use-after-release in Scala, before JNI turns the same mistake into a SIGSEGV with no stack trace; genuinely headless, so continuous integration needs no GUI toolkit.
• glyphora — a terminal UI toolkit written the way Scala wants to be written. Reactive signals, 50+ widgets, composable motion, headless tests, GraalVM native-image builds.
• gitea-scala-client — Scala 3 client for the Gitea API. ZIO 2, sttp client4, zio-json, with the endpoint surface audited against the Gitea 1.26.2 OpenAPI contract.
• codeberg4s — Codeberg/Forgejo client with a Future-based API that leaks no effect system onto your classpath, two error rails (exceptions or typed Either), and validated types that make an illegal request path unrepresentable.
• worxbend — the Mill monorepo the smaller libraries get cut from. Applications, shared libraries, deployment recipes and notes.
• data-engineering — Kafka, Kafka Connect and Apache Flink experiments, including a custom S3 sink partitioner.

All 80 projects, searchable, in one place → w0rxbend.github.io/personal-page

📧 oleksandr.balyshyn@gmail.com · 💬 @oleksandr_balyshyn