Matthew Brian Tahir/ DSE

Execution Capability · Systems Register

Systems

Execution capability is not theoretical. These are the systems built to operationalise the VFS Method. Each is designed to a specific function, built to production standard, and maintained with versioned documentation.

§ 1System Types

Decision Tools

Systems that accept structured inputs, apply validation logic, and produce defensible outputs. The operational layer of VFS.

Analytical Frameworks

Quantitative engines for scenario modelling, stress testing, and constraint verification. Designed for structured, reproducible analysis.

Infrastructure

Foundational systems that ensure audit integrity, access control, and chain-of-custody compliance. Built for regulated environments.

§ 2System Register
SYS-01Decision ToolLive

VFS Decision Console

Next.jsTypeScriptPostgreSQLTailwind

The primary intake and validation interface for the VFS Method. Accepts 5-field decision submissions, runs automated evidence grading, generates constraint matrices, and produces signed decision packets. Full audit trail with timestamped state history.

Capabilities

  • 5-field intake processing
  • Evidence grade assignment
  • Constraint matrix builder
  • Veto logic engine
  • PDF decision packet generation
  • Full audit log
SYS-02Analytical FrameworkInternal

Scenario Stress-Test Engine

PythonFastAPIReactRedis

A quantitative scenario modelling tool that runs three-case adversarial analysis against submitted decision parameters. Accepts structured input, applies configurable stress variables, and returns scenario divergence reports with flagged thresholds.

Capabilities

  • Three-scenario modelling
  • Configurable stress parameters
  • NPV and payback divergence
  • Threshold breach detection
  • Exportable scenario reports
SYS-03InfrastructureClient Deployment

Governance Audit Trail

Node.jsPostgreSQLNext.js

An append-only decision ledger for enterprise clients. Every decision event — submission, review, modification, approval, or veto — is recorded with timestamp, actor ID, and state snapshot. Designed for regulatory environments requiring full chain-of-custody documentation.

Capabilities

  • Append-only event log
  • Actor identity verification
  • State snapshot at each event
  • Exportable audit reports
  • Role-based access control
SYS-04Reference SystemInternal

Constraint Verification Database

PostgreSQLREST APINext.js

A structured repository of verified regulatory, legal, and operational constraints across four jurisdictions. Used to populate constraint matrices during intake. Each entry is sourced, dated, and graded. Constraints expire and require re-verification on a defined cycle.

Capabilities

  • Multi-jurisdiction constraint library
  • Source-linked entries
  • Expiry and re-verification cycle
  • API access for intake systems
  • Constraint conflict detection