Case Study Deep Dive: Fintech SaaS MVP Ledger APIs
How we cut p95 database latency by 40% under concurrency with Node.js workers and Redis rate limiting — without a full rewrite.
August 21, 2026 · Xaironix Team
Context
A Series-A fintech needed the ledger MVP to survive real concurrency before a funding demo. Rewriting Postgres was off the table.
Architecture
We split hot paths into a Node.js worker behind a Redis token-bucket, kept the legacy store as system of record, and moved the React console onto the new API.
Outcome
p95 latency dropped 40% under the same profile. Read the full breakdown on our fintech case study or start a similar build via Start Project.
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