contributing to production systems + learning how large codebases think about performance, correctness, and hardware.

nvidia · nccl c++ · cuda · gpu systems

worked on blackwell collective performance + p2p diagnostics, including a geometry-aware reducescatter optimization that cut 4 mib bfloat16 latency ~54% on 2×b200.

aws · s2n-bignum ocaml · hol light · x86-64 · cryptography

extended formally verified x86 semantics for timing-sensitive bit-scan instructions + added constant-time policy checks around intel doit behavior. pr #444 · issue #361

microsoft · stl c++ · standard library · abi

optimized five std::exception_ptr operations by removing unnecessary crt call boundaries while preserving abi + ownership semantics.

meta · folly c++ · concurrency · atomics

audited meteredexecutor synchronization + removed an unnecessary sequentially consistent atomic operation.

hudson river trading · slang-server c++ · systemverilog · lsp

added context-aware parameter/port autocomplete + fixed call-hierarchy navigation. 212/212 tests passing.

jane street · magic-trace ocaml · linux perf · intel pt

added hardware-triggered intel pt range tracing + fixed multi-thread trigger and timestamp correctness issues.

c++20 · boost.asio · sqlite · prometheus · grafana

a small exchange stack i built to understand the full path from receiving an order to executing it — matching, smart routing, oms/ems, execution algorithms, deterministic replay, and observability.

1m+ orders · ~35% lower p99 matching latency

c++23 · python · kafka · clickhouse · postgresql · redis

a fixed-income pricing platform for 9,500+ instruments with dependency-aware repricing and deterministic market replay. a lot of the work went into making distributed market state behave correctly through crashes, retries, and redelivery.

500 crash/restart tests · 100 concurrent writers

rust · mvcc · wal · storage engines

a transactional database built from scratch to understand what pages, buffer management, mvcc, checkpoints, and recovery look like beyond textbook diagrams.

~92% lower recovery latency · ~13× speedup

rust · ssa · cfg · sccp

an optimizing compiler with ssa construction, dominance analysis, sparse conditional constant propagation, branch folding, unreachable-block pruning, and dead-code elimination.

1,288/1,288 differential tests · 76.1% fewer ir instructions

rust · ebpf · linux · cgroup v2

a linux runtime for tracing scheduler behavior inside isolated workloads + measuring wake-to-run latency across processes and threads.

p50–p99.9 telemetry · ~0.5% runtime overhead

go · grpc · postgresql · redis · prometheus

a bounded-concurrency monitoring + reconciliation system with mtls, rbac, auditing, retries, circuit breakers, and provider inventory synchronization.

10,000 simulated servers

typescript · aws lambda · eventbridge · sqs · dynamodb · s3

an observability system for robotic fleets that reconstructs what happened even when telemetry arrives late, twice, concurrently, or out of order.

10k-event aws deployment · 32% lower p50 · 23% lower p95 investigation latency

python · polars · parquet · pytorch

a temporal reconstruction engine built around a deceptively simple question: what exactly did the dataset look like at this point in time?

handles late events, atomic checkpoints, stale-state invalidation, and crashes while preserving point-in-time correctness.

~7.06m events/sec · 7.45× throughput

go · postgresql · opentelemetry · prometheus · docker

an ai security gateway for prompt injection, pii leakage, rag provenance, cross-team isolation, and approval-gated agent actions, with durable asynchronous auditing.

~2.1k req/s · 100% audit persistence in validated fault-injection runs

python · clickhouse · fastapi · fred/alfred · bls qcew · scikit-learn

a labor-market research engine built around making sure an analysis only knows what was actually known at that point in history.

it reconstructs historical data vintages without look-ahead bias, detects multivariate labor-market regimes, and grounds generated analysis against the underlying economic data.

98% intent accuracy · 100% routing accuracy · 100% causal-safety recall