Distributed systems · AI infrastructure · Security engineering

Bringing Hope to distributed systemsat enterprise scale.

I'm Madison Hope Steiner, a Principal AI Architect. I turn complex cloud, AI, and security infrastructure into dependable systems that teams can operate at enterprise scale.

Start with the outcome, then inspect the code, reviews, commits, and documentation across my GitHub profiles. Each story separates plain-language impact from technical depth.

Multi-project security orchestration
v3.7
Agent platforms from one contract
15
SVG capability layers merged
7
Public contributions merged
135

01 / Selected work

Systems that changed what teams can do.

Each project starts with the operating result. Direct sources and an optional source map reveal the repositories, changes, commits, and files behind it. The constellation represents contribution relationships, not literal Git ancestry.

Automated Security Helper

What this system does

ASH coordinates source, dependency, infrastructure, and agent-workflow security across developer environments.

Why it matters

Advanced ASH into workspace-scale security orchestration, then strengthened the execution beneath it with a pinned multi-language scanner environment, correctly scoped ignore rules, stable finding paths, and explicit failure semantics.

  • Shipped workspace planning and per-project execution, with aggregate results that retain project identity and workspace-level policy controls.
  • Confined MCP scan targets to configured roots through canonical, symlink-aware containment and per-session isolation.
  • Built a public execute-and-collect architecture with scanner sharding and deployable AgentCore, Fargate, Lambda, and CodePipeline targets.
  • Added a hash-pinned Nix mode that supplies ten scanners across Linux and macOS, x86-64 and ARM, without requiring adopters to build a container image.
  • Closed false-confidence paths by applying nested ignore rules to the correct subtree, reporting their effect, and making secret-finding paths stable across Windows drives.
  • Made all-target scanner failures observable as execution errors and migrated the cdk-nag integration to its real 3.x policy-validation API.
Additional sources · 14
Project 01

Contribution focus

Workspace orchestration, reproducible toolchains, and scan integrityContributor and public maintainer activity · 2024–2026awslabs / automated-security-helper repository (opens in a new tab)Workspace mode shipped in v3.7.0 · pinned Nix scanner execution merged
Model spectrumRelated commit metadata
  • Claude Opus 4.7321 related commits
  • Claude Opus 5303 related commits
  • Claude 3 Opus9 related commits
  • Claude Opus 41 related commit
Explore the technical source mapRepositories, changes, commits, and files713 public records
Public contribution lineageAutomated Security Helper
01/713
Repositoryawslabs/automated-security-helperawslabs/automated-security-helper

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
9
Commits
198
File records
505
Open source

CloudFormation Guard correctness

What this system does

CloudFormation Guard evaluates infrastructure policy before deployment, where precise outcomes and trustworthy rule packs support confident decisions.

Why it matters

Strengthened evaluator semantics and reporting, then extended the work into assembled-pack validation, executable rule tests, deterministic tooling, and publication gates tied to successful checks.

  • Made negation, empty references, scoping, mixed numeric comparisons, indexes, and reporter output preserve the intended policy result.
  • Designed a four-valued outcome model so unevaluatable and not-applicable states remain distinct instead of becoming false compliance.
  • Extended the public implementation into query capture isolation, parser limits, reporter integrity, and tests that prove the intended rule path executed.
  • Added assembled-pack validation across 50 distributions and paired orphaned tests with real per-resource rules while preserving published identifiers.
Additional sources · 4
Project 02

Contribution focus

Trustworthy evaluation, reporting, and published rule packsContributor · 2026aws-cloudformation / cloudformation-guard repository (opens in a new tab)Core correction shipped in Guard 3.2.1 · rule-pack assurance available
Model spectrumRelated commit metadata
  • Claude Opus 5564 related commits
Explore the technical source mapRepositories, changes, commits, and files972 public records
Public contribution lineageCloudFormation Guard correctness
01/972
Repositoryaws-cloudformation/aws-guard-rules-registryaws-cloudformation/aws-guard-rules-registry

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
3
Commits
9
File records
26
Open source

Nix on Windows

What this system does

Nix brings reproducible build and package semantics to a growing Windows implementation.

Why it matters

Advanced the Windows build chain from its portability foundation to an upstream derivation builder and whole-project cross-build coverage, then extended libstore testing, content-addressed outputs, evaluator startup, and recursive Nix operation.

  • Introduced a deliberately scoped builder that executes supported derivations, registers valid store outputs, and reports build results under Wine.
  • Enabled large COFF objects across Windows targets and expanded CI from a narrow utility suite to the complete MinGW cross-build graph.
  • Turned Windows libstore tests into a real merge gate while enabling content-addressed and fixed-output derivations and restoring evaluator startup under Wine.
  • Lifted the recursive-Nix daemon into the shared builder and supplied the narrow platform hooks needed to make it available on Windows.
Additional sources · 11
Project 03

Contribution focus

Windows build execution, libstore assurance, and recursive operationContributor · 2026NixOS / nix + awsmadi / nix repository (opens in a new tab)Derivation builder merged · broader Windows runtime capabilities available
Model spectrumRelated commit metadata
  • Claude Opus 569 related commits
  • Claude Opus 4.64 related commits
Explore the technical source mapRepositories, changes, commits, and files96 public records
Public contribution lineageNix on Windows
01/96
RepositoryNixOS/nixNixOS/nix

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
8
Commits
21
File records
62
Open source

Organizational agent systems

What this system does

BASE, CARL, PAUL, and SEED form an interoperable toolkit for organizing agent teams, retaining decisions, planning work, and improving the workflows that produce software.

Why it matters

Helped pioneer the practical application of subagents, agent teams, durable decision memory, and organizational recursive self-improvement, then made that operating model portable across native plugins, skills directories, package runners, and multiple coding CLIs.

  • Turned agent-team and improvement patterns into recoverable, TOML-backed state with explicit integration boundaries.
  • Made decision memory portable across plugin and multi-CLI runtimes, with session-start state and schema validation.
  • Packaged planning and workflow capabilities for native plugins, standalone skills directories, and project-root discovery.
  • Extended the operating model with an installable code-index-first skill for staged reading, tool routing, and subagent guidance.
Additional sources · 6
Project 04

Contribution focus

Subagents, agent teams, decision memory, and recursive improvementBuilder and maintainer · 2026mh0pe / base-v1 + carl + paul + seed repository (opens in a new tab)Four portable frameworks · native plugins and multi-CLI runtimes
Model spectrumRelated commit metadata
  • Claude Opus 4.835 related commits
  • Claude Fable 514 related commits
  • Claude Opus 52 related commits
Explore the technical source mapRepositories, changes, commits, and files226 public records
Public contribution lineageOrganizational agent systems
01/226
Repositoryjohnhuang316/code-index-mcpjohnhuang316/code-index-mcp

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
1
Commits
2
File records
3
Open source
Live lineageautomated-security-helperAutomated Security Helper

02 / Work in motion

Public work, traced from source

Watch systems take shape, branch by branch.

Two public identities meet at the origin. Colored clusters become system families; their orbiting marks become source-linked capabilities. Distinct model colors and shapes reveal the model attribution carried by the commits behind each system.

A curated field built from public code. Every named capability opens to the pull request, commit, or fork that carries it today.

In focusSecurity systems
2026
2026-08Live upstream
Workspace orchestration stack

Plans validated workspaces, runs isolated project scans, and preserves project identity and policy context through aggregation.

Model spectrumModels attributed across the selected work
Live upstreamLive in public forkWork connection
01

Security systems

2026

I advanced workspace security orchestration and trustworthy infrastructure policy evaluation.

awslabs / automated-security-helper · aws-cloudformation / cloudformation-guard · aws-guard-rules-registry

ASH now plans project-aware workspace scans, confines agent-selected targets, supplies a pinned scanner environment, and distinguishes an empty result from failed execution. CloudFormation Guard work follows policy decisions from evaluator semantics through diagnostics, tests, and published rule packs.

  1. Plans validated workspaces, runs isolated project scans, and preserves project identity and policy context through aggregation.

02

Cloud delivery

2026

I made cloud changes easier to see, documentation executable, and the runtime beneath them leaner.

aws / aws-cdk-cli · aws / aws-cdk · aws / jsii

CDK surfaces Fn::ForEach changes, hotswaps QuickSight through CCAPI, and checks documented package paths against shipped exports. jsii clears completed promises, caches lookups, and ships a smaller embedded runtime.

03

Agent infrastructure

2026

I helped turn emerging agent frameworks into portable, learning operating systems.

awslabs / mcp · mh0pe / base-v1 · carl · paul · seed · johnhuang316 / code-index-mcp

The work combines richer agent inputs and isolated browser sessions with portable agent teams, decision memory, verified delivery, and a human-reviewed loop that turns experience into policy for later sessions.

04

Browser systems

2026

I shipped a seven-layer SVG DOM into an agent-native browser.

lightpanda-io / browser

The merged stack spans prototype inheritance, live scalar values, transactional collections, analytic geometry, structural and resource DOMs, and deterministic text metrics.

05

Durable platform semantics

2026

I carried reproducible build semantics across Windows and zero-install JavaScript projects.

NixOS / nix · nix-windows / nix-windows-demo · aspect-build / rules_js

Nix now has an upstream Windows derivation builder and whole-project cross-build coverage. The current implementation adds enforceable libstore tests, content-addressed outputs, evaluator startup, and recursive Nix operation, while the Yarn PnP importer brings the same integrity focus to Bazel.

What the lines mean. This is a curated map of public work, not a literal Git graph. Every named point opens to the PR, commit, or fork that carries the capability. Model colors and shapes distinguish exact model records from platform-only signals.

Public snapshot ·

03 / The public record

Models behind the work.

Commit-level evidence and date-aware author rules become a model spectrum across projects, repositories, and source paths. Open the record to filter the work and follow each result back to its public commit.

Explore the public record

Measurement

GitHub-reported added lines in model-attributed commits.

  • Explicit model metadata takes precedence. Otherwise, awsmadi commits use the newest public Claude Opus model available on the authored date.
  • Shared fork and upstream SHAs count once.
  • Merge commits are excluded.
  • Multi-model commits preserve every recorded model and share visual weight so each commit still counts once.
  • The Code view excludes documentation, lockfiles, generated output, and binaries; executable agent instructions count as code.
Model attribution mapping
Claude 3 Opus
Anthropic model represented by commit evidence or the dated author rule
Claude Fable 5
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 4
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 4.5
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 4.6
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 4.7
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 4.8
Anthropic model represented by commit evidence or the dated author rule
Claude Opus 5
Anthropic model represented by commit evidence or the dated author rule
Claude Sonnet 4.6
Anthropic model represented by commit evidence or the dated author rule

Current view

1,440 commits across 46 repositories; all public delivery surfaces; code additions; model focus: all models.

Public GitHub snapshot ·

Delivery surface
Content scope
Metric

Model spectrum

Added lines in associated commits

Select a model to focus the linked evidence. The distribution remains visible for comparison.

Linked evidence

Representative public commits

Ranked by the current metric, with commit and pull-request links for verification.

View 1,437 more linked commits
View exact distribution values
Exact model-attribution values for the current repository, delivery surface, and content scope.
ModelCode additionsCommitsShare of added lines
Claude Opus 5219,25794458.7%
Claude Opus 4.792,26932224.7%
Claude Fable 521,031165.6%
Claude Opus 4.617,236964.6%
Claude Opus 4.815,418364.1%
Claude Sonnet 4.65,88451.6%
Claude Opus 4.52,392110.6%
Claude 3 Opus21390.1%
Claude Opus 4010%
Current total373,7001,440100%

04 / Active extensions

Capabilities available beyond current upstream releases.

Explore the project constellation or open the linked work to trace each capability from decision through code, tests, and review.

AAvailable public implementation · upstream review activeContributor · 2026

Integrity-bound Yarn PnP for Bazel

aspect-build / rules_js + mh0pe / rules_js

After maintainer feedback, I replaced an exporter design with a zero-install importer that never runs Yarn or constructs node_modules. It cross-validates Yarn 3 and 4 lock/PnP graphs, then integrity-binds the resolver, caches, unplugged files, file types, and executable modes before Bazel loads the project.

Model spectrumRelated commit metadata
  • Claude Fable 52 related commits
Explore the technical source mapRepositories, changes, commits, and files60 public records
Public contribution lineageIntegrity-bound Yarn PnP for Bazel
01/60
Repositoryaspect-build/rules_jsaspect-build/rules_js

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
1
Commits
4
File records
54
Open source
BSeven capability layers merged upstreamContributor · 2026

A typed SVG DOM for an agent-native browser

lightpanda-io / browser + mh0pe / browser

Lightpanda merged the complete dependency-ordered SVG stack: compile-time prototype chains, live scalar values, transactional collections, analytic path geometry and bounding boxes, stack-safe structural elements, typed resources, and deterministic UTF-8 text metrics.

Additional sources · 6
Model spectrumRelated commit metadata
  • Claude Sonnet 4.65 related commits
  • Claude Opus 4.81 related commit
Explore the technical source mapRepositories, changes, commits, and files124 public records
Public contribution lineageA typed SVG DOM for an agent-native browser
01/124
Repositorylightpanda-io/browserlightpanda-io/browser

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
7
Commits
15
File records
101
Open source

05 / Architecture choices

Architecture choices, with the trade-offs visible in code.

02

One contract · 15 agent platforms · 2026

Generate integrations instead of maintaining fifteen copies

The ASH transpiler makes one validated model the source of truth for packaging, capabilities, metadata, and installation across agent ecosystems. Backend smoke tests and external validators keep generated plugins honest.

03

Seven upstream merges · 2026

Rebuild a broad browser change as a dependency-ordered stack

Reauthored a broad SVG proof against Lightpanda’s current hierarchy as seven independently reviewable layers. Each merge established the dependency surface for the next, from prototype inheritance through text metrics.

04

Maintainer feedback incorporated · open review · 2026

Redesign around zero-install invariants, not an exporter

The rules_js proposal changed direction after review. The resulting importer never executes Yarn or constructs node_modules; it reads the project’s own PnP state and rejects mismatched resolver, lock, cache, unplugged, type, or mode evidence before loading code.

05

Subagents · decision memory · reviewed learning · 2026

Turn experience into policy for the next delivery cycle

The agent operating model captures session insights, stages them as proposed rules, routes them through human review, and recalls only the decisions relevant to later work. The system does not merely remember what agents did; it turns reviewed experience into operating policy.

Organizational impact

Contexted impact

Systems shaped where scale, trust, and product reach matter.

Work spanning cloud platforms, security, financial infrastructure, mobility data, media, and consumer products.

Organization marks identify places where this work took shape. They do not imply endorsement.

Professional context on LinkedIn

Cloud and developer systems

Cloud infrastructure, application security, developer tooling, agent systems, and infrastructure-as-code reliability.
Amazon Web Services

Product and platform contexts

Organizations connected by the systems, audiences, and operating constraints that shaped the work.
  • ChainalysisBlockchain data and compliance infrastructure for high-trust financial systems.
  • CameoConsumer marketplace systems connecting creators and audiences at scale.
  • TrōvDigital insurance platforms shaped around configurable, data-driven coverage.
  • Rakuten AirMap, Inc.Airspace and mobility platforms for unmanned aircraft ecosystems.
  • F.T. IndustriesBusiness systems engineering across operational workflows.
  • cielo24Media accessibility systems, including durable audit trails for non-standard data models.
  • Quiver MediaDigital media distribution and platform operations.
  • TinderHigh-scale consumer product systems and web experiences.
  • Joint Business SolutionsBusiness software and systems integration.

Systems in context

Impact shaped by the environment around it.

Selected work across payments, banking, mobility data, and governed cloud foundations.

  • 01
    Global payments network

    Tokenized-asset platform architecture designed for enterprise trust, security, and governance.

  • 02
    Major U.S. financial institution

    Acquisition-related platform integration, regulatory remediation, and security engineering across a complex banking environment.

  • 03
    Global automotive and mobility manufacturer

    Data-lake foundations for enterprise mobility and manufacturing analytics.

  • 04
    International vehicle manufacturer

    Data-lake capabilities for large-scale operational and analytical workloads.

  • 05
    Global investment manager

    Governed AWS account provisioning streamlined for secure, repeatable cloud adoption at enterprise scale.

06 / Established systems

More systems across cloud and agent infrastructure.

AWS Labs MCP

Document intelligence · transport · browser sessions

Added richer document ingestion, document-asset extraction, Streamable HTTP/SSE transport, and an MCP server for isolated AgentCore browser sessions.

Additional sources · 1
Model spectrumRelated commit metadata
  • Claude Opus 4.647 related commits
Explore the technical source mapRepositories, changes, commits, and files384 public records
Public contribution lineageAWS Labs MCP
01/384
Repositoryawslabs/mcpawslabs/mcp

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
4
Commits
40
File records
339
Open source

AWS CDK and jsii

Infrastructure semantics · executable documentation · runtime efficiency

Made Fn::ForEach changes visible in cdk diff, added Cloud Control hotswap for QuickSight, kept 803 documented package paths aligned with shipped CDK exports, and improved jsii runtime efficiency.

Additional sources · 4
Model spectrumRelated commit metadata
  • Claude Opus 4.622 related commits
  • Claude Opus 4.511 related commits
  • Claude Opus 54 related commits
  • Claude Opus 4.71 related commit
Explore the technical source mapRepositories, changes, commits, and files41 public records
Public contribution lineageAWS CDK and jsii
01/41
Repositoryaws/aws-cdkaws/aws-cdk

Public source · Public repositoryThe public source root that anchors this contribution lineage.

Changes
1
Commits
1
File records
3
Open source

Source trail

Follow the work across mh0pe and awsmadi.

Each capability opens to the pull request, commit, release, or branch where the work lives. Explore the systems from initial proposal through review, integration, and continued evolution in public source.

Public GitHub record since 2014. Contribution snapshot Sep 3, 2026. Career timeline on LinkedIn.