Case Studies

Focused notes on the problem, the engineering approach, and the measured result. Public work links to the underlying implementation whenever possible.

Related services: Rails performance consulting & Rails Consulting

01 Learn To Be

LTB Cards product architecture at a glance: an FSRS spaced-repetition scheduler adapts intervals from four recall ratings; one shared queue coordinates new, learning, review, and relearning cards; reusable note templates support math, reading, audio, and phonics content; and the Rails application provides multiple learner profiles, English and Spanish interfaces, and phone-based sign-in.

Building an Anki inspired math and reading practice app

A client product build for Learn To Be: a focused Rails application that turns adaptive spaced repetition, reusable card templates, and phonics-aware content into a simple daily study flow.

02 Forem

Forem role-query optimization results across four paths: role queries fell from 568 to 4 for the admin member list, 139 to 3 for its CSV export, 13 to 3 for the async user payload, and 4 to 1 for the reCAPTCHA service.

Reducing role queries across Forem’s role-heavy paths

An open source Rails performance optimization that made role checks association-aware across Forem’s admin member list, CSV export, async user payload, and reCAPTCHA service.

03 Forem

Forem analytics activity backfill results at a glance: 90% lower median backfill time, 93% fewer SQL queries, 86% less SQL time, and 85% fewer allocated objects, with ten article backfills completed in six queries.

Making Forem’s cold analytics backfill 10× faster

An open source Rails performance optimization that replaced per-article analytics recomputation with bulk SQL aggregation, cutting median backfill time by 90.1%.

04 Gumroad

Gumroad Products API results at a glance: 40% faster requests, 69% less SQL time, 78% fewer SQL events, 94% fewer duplicate query fingerprints, 23% fewer allocations, and all 70 per-product target queries eliminated.

Removing per-product queries from Gumroad’s Products API

A co-authored open source Rails performance fix that batch-loaded product serialization data, cutting mean response time by 40.4% and SQL events by 77.7%.

05 Confidential SaaS platform

Reducing a Rails dashboard load time from over 2 seconds to under 200 ms

An anonymous Rails SaaS case study covering a greater than 90% reduction in dashboard load time, lower Sidekiq memory use, faster sitemap processing, and safer external-input handling.

06 OpenProject

OpenProject Work Packages API results at a glance: 56% lower median server duration, 38% less SQL time, 84% fewer SQL events, 90% fewer duplicate query fingerprints, and both repeated type-variant query patterns reduced from 381 to zero.

Eliminating 762 repeated queries from OpenProject’s Work Packages API

An open source Rails performance fix that removed repeated type-variant lookups from OpenProject’s Work Packages API and cut median server duration by 55.7%.

07 Gumroad

Gumroad Sales API results at a glance: 51% faster requests, 83% less SQL time, 74% fewer SQL events, 94% fewer association point lookups, and 31% fewer allocations, with the same API output.

Cutting Gumroad Sales API response time in half

An open source Rails performance fix that removed N+1 queries from Gumroad’s sales endpoint while preserving its API response.

08 Gumroad

Gumroad upsells dashboard benchmark for 81 products: 50% lower mean request duration, 76% less SQL time, 78% fewer SQL events, 94% fewer duplicate query fingerprints, 62% fewer allocations, and variant queries reduced from 81 to 1.

Removing an N+1 query from Gumroad’s upsells dashboard

An open source Rails performance fix that halved mean request time for a large catalog by replacing per-product variant counts with one grouped query.

09 Discourse

Discourse admin active-users endpoint results at a glance: 67% lower mean server duration, 90% less SQL time, 94% fewer SQL events, 56% fewer allocated objects, and 150 per-user 2FA existence checks eliminated.

Making Discourse’s admin active-users endpoint 66.5% faster

An open source Rails performance fix that replaced per-user two-factor authentication checks in Discourse’s admin active-users endpoint with two batched queries.