High-Frequency Transaction Ledger
Engineered a distributed ledger capable of 10,000 transactions per second with ACID guarantees, audit trails, and zero downtime during a live migration.
01 — Challenge
The problem we inherited
A fast-growing fintech needed to replace a brittle ledger that couldn't pass due diligence for enterprise clients. Peak loads caused reconciliation delays, audit exports took hours, and the team feared a big-bang migration would freeze customer funds.
02 — Approach
How we partnered
We ran a technical due-diligence sprint, modeled transaction volumes, and designed a dual-write migration path. Compliance and security requirements were treated as product features—not late-stage checkboxes.
03 — Solution
What we built
ScaleDesk built a Rust-based ledger service with PostgreSQL as the system of record, Redis for hot-path caching, and event sourcing for immutable audit logs. Shadow traffic validated correctness for six weeks before cutover. Infrastructure ran on AWS with automated failover and encryption at every layer.
04 — Outcome
Measurable business impact
The new ledger sustains 10,000 TPS with sub-2ms P99 writes and passed SOC 2 scrutiny within the same quarter. Enterprise deals that were blocked on architecture finally closed.
Client voice
“They delivered a ledger our compliance team actually trusts—and our engineers enjoy maintaining.”
