fluentui — Engineering Performance
22 engineers all time · Jan 2025 – Aug 2026 · built 2026-08-23 · GitHub
Performance snapshot
Today's rolling 90-day reading for fluentui, compared with the start of the series. Pick a window to move that comparison point.
Eff. capacity added
+11.5engineers
13 devs deliver like 24 (1.9x pre-AI)
Avg. perf / dev / mo (ETV)
+207.7%
0.53 → 1.62
Active engineers
−38.1%
21.0 → 13.0
Features
+3.5pp
39.3% → 42.8%
fluentui vs. Microsoft
Per-engineer ETV for fluentui against Microsoft as a whole. Both lines are 90-day rolling averages scaled to a 30-day month, so they share one axis and can be read against each other at any point. Pick a window to zoom the chart to it.
Performance over time
ETV stacked by Features / Maintenance / Tests / Docs / Fixes — 90-day moving average, normalized to ETV / month.
Engineering capacity
Effective engineers behind fluentui, in pre-AI terms. Per-engineer ETV divided by the Q1 2025 baseline of 0.86 ETV / dev / mo gives a capacity multiple, and that multiple applied to the engineers active in the trailing 90 days turns it into engineer-equivalents. The line is the real headcount, so the gap between line and area is what the leverage is worth.
Knowledge concentration
How dependent is this repo on a small number of engineers? Higher top-1 share = higher key-person risk.
Dmytro Kirpa owns 15.7 % of commits.
Reports
Written summary of the work completed each month.
No monthly reports available yet.
Top engineers
Most impactful commits
Top 10 by ETV in the all-time window.
- 11.9ETVfeat(web-components): generate SSR templates and stylesheets into src/ (#36259) ## Previous Behavior SSR template HTML and stylesheet CSS were generated at build time and written only to `dist/`. The output had no presence in `src/`, was never committed, and contributors had no way to inspect the DSD output without running a build. ## New Behavior SSR templates and stylesheets are now generated next to their `*.template.ts` / `*.styles.ts` siblings in `src/` and committed to the repo. This makes the DSD output visible during the WC v3 alpha. `yarn compile` no longer regenerates them; it copies `src/**/*.template.html` and `src/**/*.styles.css` into `dist/esm/`. `yarn generate:ssr` runs the harness's `generateFTemplates` and `generateStylesheets` with `outDir: 'src'` and formats the result with Prettier. `yarn check:ssr` runs the generators against a staging directory and compares the result to `src/` and the working tree. It reports `unchanged`, `created`, `updated`, `stale`, `handEdited`, and `conflicts`, and exits non-zero when stale, hand-edited, or conflicting files appear. `yarn compile` is extended to copy `src/**/*.template.html` and `src/**/*.styles.css` into `dist/esm/` after `tsc`, preserving subdirectory structure. The old `build:ssr`, `build:ssr:styles`, and `build:ssr:templates` scripts were removed.John Kreitlow · 3fc293f0 · 2026-06-11
- 4.5ETVtest(react-menu): add hook-level regression tests for react-menu components (#36080)Victor Genaev · cb0574cc · 2026-05-15
- 3.8ETVfix(web-components): harden component lifecycle for SSR/DSD hydration scenarios (#35838)John Kreitlow · da4bf9e4 · 2026-04-06
- 2.7ETVfeat(web-components): add Dropdown, Listbox, and Option components (#32116)John Kreitlow · f706fe1a · 2025-02-03
- 2.4ETVchore: migrate v9 packages to use eslint flat configs (#35418)Victor Genaev · e3c76a57 · 2025-11-12
- 2.4ETVfeat(react-toast): headless toast implementation (#36059) Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>Dmytro Kirpa · da3b7a4f · 2026-05-28
- 2.3ETVfix(react-components,react-charts): migrate to R19 compatible JSX.* namespace types (#34923)Martin Hochel · bbaeb73e · 2025-07-31
- 2.2ETVfeat(motion): Add Stagger choreography component (#34705)Robert Penner · ead2f273 · 2025-11-06
- 2.1ETVfeat(react-headless-components-preview): add Popover & positioning (#36006)Victor Genaev · d44cd64b · 2026-05-01
- 2.1ETVfeat(react-headless-components-preview): add Tag family (#36230)Victor Genaev · ecb629c1 · 2026-05-27