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ryux1/README.md
Ryu — systems engineer. Software should keep its promises.

SELECTED WORK   ·   ALL PULL REQUESTS   ·   REPOSITORIES

Engineering past the happy path.

I work on systems where correctness depends on the behavior people usually skip: compatibility boundaries, concurrency, resource accounting, authorization, failure recovery, and the exact promise an interface makes.

My public work is primarily upstream engineering. I reproduce the condition, locate the violated invariant, make the narrowest defensible change, and leave behind evidence that explains why it is correct.

OPERATING RANGE

runtime semantics

distributed systems

reliability + recovery

security boundaries

performance evidence

Built work

MCP Trace

A security-first observability gateway for Model Context Protocol traffic. It traces, measures, records, inspects, and safely replays Streamable HTTP without taking over authentication or server routing. The public preview includes a runnable container, deterministic demo, Prometheus metrics, OpenTelemetry export, and explicit compatibility and security boundaries.

SOURCE · DOCUMENTATION · PUBLIC PREVIEW

Selected casework

01 / APACHE DATAFUSION · RUST + ARROW

Account for memory once.

Removed repeated record-batch accounting while preserving correctness for view arrays, shared buffers, and zero-copy slices.

MERGED 		02 / SUPABASE REALTIME · ELIXIR

Authorize only what will be written.

Preserved explicit Broadcast and Presence policy checks without performing unrelated extension reads.

MERGED
03 / NASA F´ · C++

Make four states one invariant.

Centralized parameter-validity semantics across a flight-software framework API and its regression coverage.

MERGED 		04 / APACHE HUDI · JAVA + SPARK

Reject what cannot be represented.

Turned unsupported procedure filter functions into explicit validation failures with focused tests.

MERGED

More merged work in pyasn1 · Apache Sedona · typeshed · aiohttp · Sentry CLI

The work

RUNTIME

Linux behavior, filesystems, memory, native interfaces, and compatibility. 		DISTRIBUTED

Networks, services, authorization, coordination, and partial failure.
ASSURANCE

Explicit policy, provenance, diagnostics, and deterministic verification. 		PERFORMANCE

Measurement, hot paths, resource models, and optimization without semantic drift.

Rust   C++   Go   Elixir   Python   Java   TypeScript

Observe the behavior. Find the boundary. Change the minimum. Prove the result.

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