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  • Gumbii Digital LLC
  • North Carolina, United States
  • 03:00 (UTC -04:00)
  • X @GumbiiDigital

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GumbiiDigital/README.md

Gumbii Digital

I build local AI infrastructure, evidence-gated automation, and operator tooling for systems that need to be understandable, testable, and recoverable.

My work connects physical infrastructure, distributed compute, networking, model operations, validation, and technical documentation. I focus on the part that is often skipped: proving what a system did, defining when automation must refuse to act, and leaving behind artifacts another engineer can inspect.

What I build

  • Local multi-system AI infrastructure and operating methods
  • Evidence-gated network diagnostics and change planning
  • Guarded recovery systems with refusal, cooldown, verification, and rollback
  • Reproducible model-serving, quantization, and benchmark workflows
  • Privacy-safe engineering documentation, case studies, and publication checks

Selected public work

Each project below is a privacy-reviewed public engineering record. The case studies, architecture documents, measured results, operating records, and automated safety checks are available in the repository.

Project What it demonstrates Inspect the work
DGX Cluster Eight-system fabric repair, NCCL tuning, rack recabling, printed PSU supports, and bounded thermal validation Case study / Thermal build / Photographic record
Gumbii Digital DGX Spark Lab Notes (Unofficial) Independently maintained workflow notes with prerequisites, gates, evidence, rollback, and acceptance criteria Case study / Architecture / Lab-note inventory
Evidence-Gated Network Agent JSON-first discovery, fixed evidence gates, confirm-to-apply controls, rollback, and reporting Case study / Architecture / Evaluation record
Network-Agent Research Flywheel Sanitized corpus design, holdout evaluation, quarantine, and privacy/action-safety promotion gates Case study / Architecture / Evaluation record
Guarded Power Recovery Multi-signal recovery decisions, refusal logic, cooldown, state verification, and rollback principles Case study / Architecture / Recovery evidence
GLM 5.2 on DGX Spark Version-pinned operations, dry-run validation, distributed serving plans, and reproducible checks Case study / Architecture / Operations record
Spark NVFP4 Lab Provenance, repeatable quantization and benchmarking, quality gates, and candid limitation tracking Case study / Architecture / Experiment record

How I engineer systems

  1. Prove identity and current state before acting.
  2. Separate observations, measurements, plans, actions, results, and unknowns.
  3. Define acceptance criteria and rollback before risky work.
  4. Require evidence gates for changes; refuse when evidence is incomplete.
  5. Treat a green test as evidence for a specific claim, not proof of everything.
  6. Publish the method and artifacts without publishing the live environment.

Synthetic public architecture

The diagram below is fictional and uses reserved documentation addresses. It demonstrates the engineering pattern only; it does not reproduce or approximate a live topology.

flowchart LR
    operator["Operator workspace<br/>control.example<br/>192.0.2.10"]
    evidence["Evidence and planning<br/>evidence.example<br/>198.51.100.20"]
    gate{"Policy and safety gates"}
    target["Synthetic compute target<br/>compute.example<br/>203.0.113.30"]
    receipt["Validation and receipts"]

    operator --> evidence
    evidence --> gate
    gate -->|approved plan| target
    gate -->|insufficient evidence| operator
    target --> receipt
    receipt --> evidence
Loading

Defensible by design

The public repositories are built so a reader can inspect more than prose:

  • Case studies explain the problem, engineering choices, evidence, and limitations.
  • Architecture documents show the public-safe system model.
  • JSON examples make contracts and decision records concrete.
  • Standard-library safety checkers scan every repository for prohibited private data.
  • GitHub Actions rerun the publication-safety check on every change.

The examples are intentionally synthetic. They support review of the method without creating live deployment claims.

Publication boundary

I do not publish live IP addresses, credentials, access tokens, private keys, account or pairing secrets, or direct remote-access endpoints. Public engineering records may include hardware layout, service roles, outlet maps, BLE behavior, and operational topology when those details are part of the evidence and do not expose live network addressing or control credentials. Public examples use reserved documentation addresses and fictional names. Future technical material is added only after privacy review.

For project-specific questions, open an issue in the relevant public repository.

Copyright

Copyright (c) 2026 Gumbii Digital. All rights reserved. See COPYRIGHT.md for the publication and reuse terms.

Pinned Loading

  1. dgx-cluster-public dgx-cluster-public Public

    Eight-system DGX Spark engineering: fabric repair, NCCL tuning, rack recabling, custom 3D-printed PSU supports, and thermal validation.

    Python 8 1

  2. dgx-spark-guarded-power-recovery-public dgx-spark-guarded-power-recovery-public Public

    Fail-closed power recovery design for local AI infrastructure with identity and environmental safeguards.

    Python

  3. spark-nvfp4-lab-public spark-nvfp4-lab-public Public

    Provenance-first NVFP4 quantization and benchmark workflow for DGX Spark.

    Python

  4. gumbii-dgx-spark-lab-notes gumbii-dgx-spark-lab-notes Public

    Unofficial Gumbii Digital lab notes and evidence-led workflows for DGX Spark.

    Python