BuildIQ

Executive Summary

BuildIQ is the flagship product-engineering case study: a construction management platform in active development, built with Python, FastAPI, React, TypeScript, and PostgreSQL around deterministic business workflows, explicit authorization, subscription enforcement, production gates, testing, and documentation.

Problem

Complex workflows require explicit permissions, subscription states, deterministic calculations, production configuration, and dependable release gates.

Role

Independent Backend & Product Engineer

Responsibilities

• Product planning and architecture documentation
• Python and FastAPI backend delivery
• React and TypeScript product interface
• Role, permission, and subscription-state enforcement
• Production configuration gates, CI, dependency auditing, and security testing

Technical Stack

Python · FastAPI · Starlette · PostgreSQL · React · TypeScript · Vite · Vitest

Architecture

A Python and FastAPI application core owns business rules, authorization, subscription state, calculations, API boundaries, and protected PDF generation.

PostgreSQL persists company-scoped product data behind explicit application services.

A React and TypeScript interface consumes documented API contracts; Vite provides production builds and route-level lazy loading while Vitest covers product behavior.

AI assistance is a bounded product direction, not a replacement for deterministic workflows or an unsupported implementation claim.

flowchart LR
    U[Authenticated user] --> F[React and TypeScript interface]
    F --> A[FastAPI boundary]
    A --> P[Authorization and subscription policies]
    P --> S[Python domain services]
    S --> D[(PostgreSQL company data)]
    S --> C[Deterministic calculations and documents]
    T[Pytest, Vitest, audits, and Gitleaks] --> A
    G[Production configuration gates] --> A

Engineering Challenges

Maintaining clear authorization, tenant boundaries, deterministic business behavior, and production readiness across a broad active product surface.

Security Considerations

Authorization, role enforcement, subscription state, tenant isolation, production configuration, dependency auditing, Gitleaks, and security tests are release requirements. Private implementation details remain excluded.

Production Considerations

• Environment-specific configuration is validated before release.
• Tenant isolation, role and permission enforcement, subscription state, 127 backend tests, 45 frontend tests, dependency auditing, Gitleaks, and build output form the reviewed release gate.
• CI, release documentation, architecture evidence, reviewed commits, controlled migrations, health checks, and rollback-ready verification support production safety.

Lessons Learned

Product planning, domain language, enforcement boundaries, testing, and operational gates must evolve together. Any future assistance must remain bounded by authorization, human review, and deterministic product rules.

Current Status

Active development. An active, testable product foundation with 127 backend tests, 45 frontend tests, CI, architecture documentation, and release evidence; no customer, revenue, adoption, or commercial-traction claim is made.

Future Roadmap

• Continue hardening domain boundaries and tenant-scoped workflows.
• Expand evidence-led product modules only after their rules and acceptance criteria are explicit.
• Keep AI-assisted capabilities bounded by authorization, review, and observable failure states.