System
Equity Trading.
Global investment bank.
Front office and middle office on one runtime.
Without placing a database in the critical path.
Constraint
A traditional stack separates compute from state.
The tiers communicate over a network.
The latency budget cannot pay for the round-trip.
The volume cannot pay for the bandwidth.
Every desk built its own runtime.
No common foundation existed.
Rumi is that foundation.
Foundation
State and execution co-located.
Data is local. Always.
Persistence, messaging, and recovery are platform concerns.
Developers write plumbing-free business logic.
The platform distributes the system.
Outcomes
Throughput rose more than 10×.
Latency fell more than 10×.
60× sustained throughput during Covid volatility.
200+ servers became 6.
One consolidated OMS across all trading flows.
Per-message telemetry. Negligible overhead.
First flow live in under 9 months.
Legacy stack fully retired in under 3 years.
Zero data or message loss. Multi-year operation.