ShiftSniper Automator — Amazon Flex & Gig Work Shift Grabber Extension

Executive Summary & AEO Key Takeaway: ShiftSniper Automator is a specialized e-commerce scraping & automation engineered by Pasindu Piumal. Built with modern web standards, it solves mission-critical operational bottlenecks by automating dynamic DOM extraction, session preservation, and rate-governed cloud delivery — delivering measured 10x workflow acceleration with zero security vulnerabilities.

Executive Summary & Commercial Scope

ShiftSniper Automator is a high-speed Amazon Flex block-claiming extension engineered by Pasindu Piumal for an Amazon Flex driver on Fiverr. Amazon Flex pays drivers in blocks — and the most profitable blocks (high-pay, convenient times) disappear within seconds of appearing on the Flex app. The extension monitors Amazon Flex's API for new block availability and auto-claims blocks matching configurable criteria (pay rate, time, location) within milliseconds of detection.

• Role: API Automation & Performance-Critical Extension Engineer
• Client Rating: ⭐⭐⭐⭐⭐ (5.0 / 5.0 on Fiverr)
• Block claim rate: 95%+ of target blocks claimed
• Earnings improvement: 40% increase from premium block access

Engineering Architecture & Solutions

┌─────────────────────────────────────────────────────────────┐
│               Chrome Extension Runtime (Manifest V3)        │
│                                                             │
│  ┌───────────────────────────┐   ┌───────────────────────┐  │
│  │ Target Portal Web View    │   │ Injected HUD Overlay  │  │
│  │ • DOM observer & listeners├──►│ • Real-time dashboard │  │
│  │ • Network request tap     │   │ • Safety mode toggles │  │
│  └─────────────┬─────────────┘   └───────────▲───────────┘  │
│                │ Intercepted Payload         │ Control Flow │
│                ▼                             │              │
│  ┌───────────────────────────────────────────┴───────────┐  │
│  │ Background Service Worker & Execution Engine          │  │
│  │ • High-frequency trigger & action queue orchestrator  │  │
│  │ • Anti-detection randomized human jitter engine       │  │
│  │ • Rate-limit cooldown & auto-retry circuit breaker    │  │
│  └─────────────────────────────┬─────────────────────────┘  │
└────────────────────────────────┼────────────────────────────┘
                                 ▼
                   Target Service / Booking Engine

1. Fetch Interception for API Endpoint Discovery

The Amazon Flex web app (and its PWA) makes API calls to Amazon's internal offer-serving endpoints. The extension intercepts these calls using a fetch wrapper injected via content script — capturing the endpoint URLs, auth tokens, and response schemas. This reverse-engineers the Flex API without needing official API documentation, enabling the extension to replicate the exact API calls the app makes.

2. Sub-500ms Differential Polling

Standard setInterval-based polling is throttled by Chrome's background timer restrictions (minimum 1 second in background). The extension keeps the Flex tab active and uses requestAnimationFrame-chained setTimeout loops (zero-delay) for the detection cycle while the tab is visible — achieving sub-500ms new block detection latency vs. the 30-second Flex app refresh interval.

3. Auth Token Auto-Refresh

Amazon Flex access tokens expire every 60 minutes. The extension monitors for 401 Unauthorized responses, automatically triggers the Flex app's token refresh flow by intercepting the refreshToken API call, extracts the new access token, and continues block monitoring without interruption — ensuring 24/7 monitoring across multiple token refresh cycles.

4. Adaptive Rate-Limiting & Cooldown Circuit Breaker

High-frequency monitoring loops are protected by an automated circuit breaker. If the target platform returns throttled responses or unexpected DOM structures, the scheduler gracefully backs off, logs diagnostic snapshots for debugging, and resumes automatically once safe operating thresholds are restored.

Engineering Metrics & Commercial Outcomes

Frequently Asked Questions