The “We Rewrote It in X” pattern is a technical blog post about replacing an existing implementation with another language, library, or framework. It works best when the rewrite solves a specific project problem rather than merely celebrating a fashionable technology. section 9.0 section 9.5.2
Start with the project, its requirements, and the reason the old choice stopped fitting. Then compare alternatives, introduce the new technology, describe migration mechanics, and report measurable results. section 9.4.3 section 9.5.1
Make the post useful to readers considering a similar rewrite:
- Explain why the original language was chosen, why it was abandoned, and which alternatives were rejected. section 9.5.1
- Describe the project’s scale, history, users, and priorities so readers can judge whether the decision transfers to their situation. section 9.5.2
- Show migration tools, verification tools, corrective scripts, and idiomatic old-to-new code examples. section 9.4.2
- Name failures, tooling gaps, dependency problems, documentation weaknesses, and subtle errors, along with the responses to them. section 9.5.3
- Support the verdict with before-and-after metrics and annotate the resources that helped or failed during the work. section 9.3.3 section 9.5.4
A credible rewrite report
A service moved from Go to Rust after latency spikes became unacceptable. The report explains the scaling problem, describes an iterative migration, notes a surprising HashMap-to-BTreeMap choice, and compares performance before and after. A different report contrasts difficult Rust firmware with cleaner Zig equivalents while acknowledging Zig’s immature ecosystem, compiler bugs, and sparse documentation. section 9.3.3 section 9.3.1
Use the pattern honestly: readers are wary of promotional rewrites. A balanced account can encourage adoption, improve community knowledge, validate the migration, or make a failed rewrite useful. section 9.1 section 9.5
