BQL Engine replays market workloads and proves the behaviour was identical.
Deterministic replay, canonical state digests, latency contracts enforced in CI, and sealed evidence bundles. Built for engineering teams maintaining market-data handlers, limit-order-book engines, and the systems that depend on them.
Blanc Quant Systems is the company · BQL Engine is the product
Single-node ITCH benchmark · environment metadata and reproduction command published on /benchmarks
Four modules, one sealed artifact.
Deterministic replay
Replay recorded market workloads through the engine and compare canonical state digests run over run. Identical input must produce identical book state, or the run fails.
- ITCH workload supported end-to-end
- Canonical order-book state hashing (SHA3-256)
- Digest comparison across tested environments
- Byte-level divergence reporting on mismatch
Ideal buyer · Teams maintaining market-data handlers and LOB engines.
Latency contracts
Express p50 / p95 / p99 / p99.9 budgets as contracts enforced in CI. A merge that widens the tail fails the gate instead of reaching production.
- Percentile gates enforced at merge
- Per-stage timing across ingest, decode, book build
- Regression deltas against a pinned baseline
- Prometheus-compatible metric export
Ideal buyer · Platform and infra teams with latency SLOs.
Runtime protection
Guardrails that detect drift between what a system did in test and what it does under load: state divergence, ordering violations, and budget breaches.
- State-log divergence detection
- Sequence and ordering invariants
- Budget-breach classification by stage
- Structured failure output for triage
Ideal buyer · Teams operating systems where silent divergence is unacceptable.
Evidence packaging
Every run seals an artifact bundle a reviewer can re-run: benchmark records, metrics, environment metadata, compiler flags, golden digest, and gate results.
- bench.jsonl · metrics.prom · manifest.yaml · summary.txt
- Compiler, kernel, and CPU metadata captured per run
- Golden digest recorded alongside gate outcomes
- Forwardable to risk, audit, and diligence reviewers
Ideal buyer · Teams answering to audit, risk, or an acquirer's diligence.
From feed to forwardable brief.
Recorded market workload, byte-identical on every run.
Input pinned so a run is provably the same run.
Engine reprocesses the workload under fixed conditions.
Book state emitted as a comparable, ordered record.
p50 / p95 / p99 / p99.9 contracts evaluated per stage.
SHA3-256 over canonical state; mismatch fails the run.
Metrics, manifest, environment metadata sealed together.
A summary a risk or diligence reader can act on.
Controlled benchmark environment · not a live-exchange claim
Who runs BQL Engine, and what they walk away with.
A decoder change subtly alters book state and nobody notices until production.
Artifact · Replay run with matching golden digest and a per-stage latency report.
Behaviour must be demonstrably identical across releases and environments.
Artifact · Cross-environment digest comparison sealed in one bundle.
Backtest and live paths drift, and the divergence is invisible in aggregate stats.
Artifact · Deterministic replay of the same workload through both paths.
Prospects want proof of latency claims, not a datasheet.
Artifact · Reproducible benchmark bundle with environment metadata and a re-run command.
Reviewers ask how system behaviour was verified and get a narrative answer.
Artifact · Signed evidence bundle with gate results and reproduction steps.
An acquirer or investor needs to validate performance claims independently.
Artifact · Public harness plus a bundle the reviewer can execute themselves.
A 4–6 week engagement that ends in artifacts, not slides.
Target system, workload selection, success criteria, environment access.
Replay harness stood up, golden digest recorded, baseline percentiles pinned.
Latency contracts wired into your pipeline; failing merges blocked.
Written findings, sealed evidence bundle, and a maintenance handover.
Company, financing, and co-founder detail lives on the company page so this page stays focused on engineering buyers.