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Author

Jim Calabro ♟️

@calabro.io

Engineer @ Bluesky I love computers!

Posts

10

Publications

4

Readers

28

Jim's PcktApr 10, 2026

April 2026 Outage Post-Mortem

Hey all! I'm Jim, and I do system-y things at Bluesky. I'm here to give you some details about what happened on Monday of this week that caused Bluesky to go down intermittently for ~1/2 our users for about 8 hours. First, I'd like to apologize to our users for the interruption in service. This is easily the worst outage we've seen in my time here. It's just not acceptable. Second, if you find this work interesting, we're hiring!

Jim on SoftwareMar 28, 2025

Building Statically Linked Go Executables with CGO and Zig

A quick demo of how straight-forward it is to build a statically-linked Go executable that calls in to CGO dependencies with Zig

Jim on SoftwareMar 20, 2025

uscope Update #2

Quick progress update, resetting project direction

Jim on SoftwareFeb 18, 2025

uscope Update #1

Nested variable rendering, multi-threaded subordinates, Odin, and bugfixes.

Jim on SoftwareJan 26, 2025

uscope: A New Debugger and Introspection Toolchain

The why, what, and how of building a new debugger

Jim on SoftwareSep 28, 2024

How DWARF Works: Debug Information Entries

What are DIEs? How do we write code to load them from a binary?

Jim on SoftwareSep 26, 2024

How DWARF Works: Parsing Just Enough ELF

What is an ELF file? Why do we need it? How do we parse just enough of one to get the information we care about?

Jim on SoftwareSep 25, 2024

How DWARF Works: Go Code Reference

Reference Go helper code used throughout the How DWARF Works series

Jim on SoftwareSep 25, 2024

How DWARF Works: Table of Contents and Introduction

This series answers questions such as "what is DWARF/ELF?" and "How do debuggers work?"

Jim on SoftwareJul 11, 2024

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