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fbthrift — Engineering Performance

72 engineers all time · Jan 2025 – Aug 2026 · built 2026-08-23 · GitHub

Performance snapshot

Today's rolling 90-day reading for fbthrift, compared with the start of the series. Pick a window to move that comparison point.

Eff. capacity added

+16.7engineers

46 devs deliver like 63 (1.4x pre-AI)

Avg. perf / dev / mo (ETV)

+83.8%

0.64 → 1.17

Active engineers

+24.3%

37.0 → 46.0

Features

+1.4pp

32.2% → 33.6%

fbthrift vs. Meta

Per-engineer ETV for fbthrift against Meta 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.

fbthrift
1.17ETV / dev / mo
0.39 (25.0%) past 90d
Meta
1.36ETV / dev / mo
+0.17 (+14.3%) past 90d

Performance over time

ETV stacked by Features / Maintenance / Tests / Docs / Fixes — 90-day moving average, normalized to ETV / month.

Engineering capacity

Effective engineers behind fbthrift, 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.

Effective engineers
63engineer-equivalents
+17 engineers above real headcount
Real engineers
46engineers
active in the trailing 90 days
Capacity vs pre-AI
1.4x
per engineer, vs 0.86 ETV / dev / mo

Knowledge concentration

How dependent is this repo on a small number of engineers? Higher top-1 share = higher key-person risk.

Top 1
13.5 %
Top 3
32.2 %
Top 5
46.8 %

Jack Chistyakov owns 13.5 % of commits.

Reports

Written summary of the work completed each month.

No monthly reports available yet.

Most impactful commits

Top 10 by ETV in the all-time window.