CLOSE-OUT PACKAGE
MANAGEMENT SYSTEM
Telecom construction platform automating Verizon-format PDF deliverables, multi-stage photo workflows, GPS verification, and manager approval gates.
Operational Friction
Telecom cell-site construction teams manually assembled hundreds of site photos and compliance checklists into client-specific PDFs. Disconnected field capture led to unverified photo locations, inconsistent document revisions, and prolonged approval delays before client submission.
Engineered Solution
Architected a 13-domain modular monolith combining a 3-stage sequential field capture engine (Pre-Construction → Construction → Post-Completion) with GPS/EXIF verification, an automated approval readiness gate, and an isolated Browsershot queue supervisor that renders format-exact Close-Out Package PDFs with revision ledgers.
Architecture & Backend Implementation
Full-Stack Architect & Lead Backend Engineer: Designed the 13-domain modular monolith, built the Browsershot PDF layout engine, and implemented 455 automated test cases.
Engineered algorithmic pagination calculating total page counts up front across checklists, category tables, and 2×2 photo grids rendered via Browsershot.
Built a 3-stage state machine with draft autosave, rejection rework loops, and multi-table transactional package seeding.
Implemented GPS capture with EXIF rational parsing fallback, server-side HEIC-to-JPEG conversion, and immutable slot replacement chains.
Created a multi-rule programmatic report validating required site info, photo counts, and checklist responses before allowing final sign-off.
Key System Modules
Format-Exact PDF Engine
Automated Browsershot rendering matching Verizon deliverable standards with 2×2 photo grids and Page X (Y) numbering.
Sequential 3-Stage Workflow
Strict field capture pipeline (Pre-Construction → Construction → Post-Completion) with resumable drafts and rejection rework.
Verifiable Photo Capture
Location-verified photos with EXIF rational fallback parsing, server-side HEIC conversion, and immutable slot history.
Programmatic Readiness Gate
Rule-based engine blocking final approval until site info, checklist responses, and required photo counts are 100% complete.
SSO & Bidirectional Sync
AuthCenter token exchange with HMAC-SHA256-signed inbound sync webhooks and queued outbound account synchronization.
4-Tier Horizon Queue Topology
Resource-isolated supervisors prioritizing high-priority notifications, CPU-heavy PDF generation, and transactional email.
Operational Interfaces
System Topology & Data Flow
React 18 SPA (Inertia.js v2)
Tailwind CSS · Zustand State · In-App Camera
Laravel 12 Modular Monolith
13 Domain Modules · Action & DTO Architecture · Policy Gates
PDF Layout Engine
Algorithmic pagination & Browsershot Chromium rendering
Workflow State Machine
Sequential stage gating & approval readiness validation
Media & GPS Service
EXIF rational extraction & HEIC-to-JPEG conversion
Persistence & Storage
- •MySQL 8 Relational Database (38 Migrations)
- •Redis 6+ Queue, Cache & Session Store
- •Private Storage Disk for Versioned Deliverable PDFs
Third-Party & Integrations
- •AuthCenter SSO (HMAC-SHA256 Token Sync)
- •Brevo Transactional Email API (Idempotent Sends)
- •Headless Chromium / Puppeteer Bridge
Technical Deep-Dive & Decisions
Format-Exact PDF Rendering with Algorithmic Pagination Under Heavy Media Load
Telecom deliverables require an uncompromising physical document layout with dynamic page numbering (Page X of Y), 2×2 photo grids grouped by construction stage, and strict table boundaries without memory exhaustion.
Systematic Resolution
Engineered an upfront pagination calculator that computes total page count before invoking Browsershot, chunking checklists into 18 items/page, categories into 30/page, and photos into 4/page while preserving stage headers across page breaks.
Intentional Design Choice
Isolated PDF generation into a dedicated 512MB Horizon queue supervisor ('pdf') with configurable timeouts and automatic temp-file cleanup hooks in finally blocks.
Prioritization Rationale
Accepted asynchronous background rendering with client-side polling over synchronous HTTP generation, guaranteeing rock-solid web server responsiveness during 100+ photo compilations.
Expanded Application Views
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Business & Operational Value
Eliminated 100% of manual PDF formatting and photo collation effort, shrinking close-out package turnaround time from days to automated minutes.
Achieved zero document rejections from Verizon engineers due to built-in programmatic approval readiness gates and format-exact rendering.
Delivered an industrial-grade engineering foundation verified by 455 automated test cases and PHPStan level-max static analysis.
Categorized Stack
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