Amazon Automation
Amazon SP-API Integration & Automation Engine
End-to-End Amazon Selling Partner API Automation for High-Volume Catalog, Inventory, and FBA/FBM Fulfillment
We engineered a high-throughput, serverless Amazon SP-API integration system that automates catalog sync, inventory reconciliation, FBA/FBM order processing, and settlement reporting.
E-Commerce & Retail4 monthsTeam: 8 Engineers$65,000Completed & Deployed
Technology
Amazon SP-API (Selling Partner)AWS Lambda & SQSNode.js / TypeScriptRabbitMQ & RedisDocker / ECSPostgreSQL (RDS)LWA OAuth 2.0 Auth
Platform
Web ConsoleAWS CloudERP Bridge
50,000+/day
Orders
99.98%
Accuracy
<500ms
syncSpeed
-98.4%
errorDrop
1.2M SKUs
skusHandled
120k Peak
primeDayVolume
Overview
Project Overview
For a leading global multi-marketplace Amazon seller managing over 1,200 active SKUs across North America and European channels, manual order intake and fragmented stock updates were causing operational bottlenecks, mis-shipments, and stockout penalties. Ctas Info Services architected and deployed a resilient Amazon SP-API automation platform built on serverless AWS microservices. The engine respects Amazon's complex Leaky Bucket rate limits using an automated token bucket queue, absorbs peak Prime Day traffic surges without packet loss, and delivers real-time visibility into fulfillment health—cutting order errors by 98.4% and freeing operational teams for strategic growth.
Client Context
A premier multi-brand retailer managing over 1,200 active SKUs across Amazon US, Canada, Europe, and UK marketplaces.
98.4% reduction in order processing errors and zero mis-shipments across all Amazon marketplaces
Sub-500ms real-time multi-channel inventory synchronization across FBA, FBM, and internal warehouses
Fully automated processing of 50,000+ daily orders without requiring manual CSV uploads or human intervention
Challenges
Key Challenges
Obstacles we identified and addressed during the project.
- 1Strict Amazon SP-API rate limits & burst throttling across Sellers & Vendors (Restricted Data Tokens & Leaky Bucket limits)
- 2Multi-Region Order Synchronization (US, CA, UK, EU, JP) with real-time FBA & FBM tracking status updates
- 3Automating complex feeds & reports parsing (XML, Flat File TSV, JSON) for high-volume catalog listing updates
- 4High peak concurrency handling during Prime Day & Q4 Holiday sales surges without packet loss or duplicate orders
- 5Strict compliance requirements for Amazon Data Protection Policy (DPP) & Developer Security Standards
Solutions
Our Solutions
Technical and strategic approaches that resolved each challenge.
- Engineered an intelligent token bucket queue manager with automated exponential backoff & rate limit handling for SP-API endpoints
- Built asynchronous event-driven serverless ingestion using AWS SQS, EventBridge, and Lambda microservices for real-time order hooks
- Implemented auto-reconciling FBA inventory pipelines with automated Purchase Order (PO) triggers for low-stock SKUs
- Integrated LWA (Login with Amazon) restricted data token (RDT) security pipelines compliant with Amazon Data Protection Policy (DPP)
- Created automated TSV/XML feed processors with validation pipelines for zero-error catalog updates and pricing feeds
Highlights
Project Highlights
Key features and achievements delivered.
1
98.4% reduction in order processing errors and zero mis-shipments across all Amazon marketplaces
2
Sub-500ms real-time multi-channel inventory synchronization across FBA, FBM, and internal warehouses
3
Fully automated processing of 50,000+ daily orders without requiring manual CSV uploads or human intervention
4
Zero downtime scaling through Prime Day traffic bursts with 120,000+ peak daily order processing capacity
5
100% compliance with Amazon Developer Security Policy & Restricted Data Access token specifications
Goals
Strategic Objectives
Strategic objectives that guided the project.
Automate complete order fulfillment workflow from Amazon SP-API directly into internal ERP and WMS databases
Eliminate stockouts, overselling, and account suspension risks across multi-marketplace seller accounts
Ensure 100% compliance with Amazon Data Protection Policy (DPP) & SP-API developer security requirements
Provide operations managers with a real-time dashboard monitoring catalog health, order feeds, and shipment statuses
Strategy
Implementation Approach
Implementation approach and technical decisions.
Outcomes
Achieved Results
Measurable results and business impact.
Revenue Scale — Enabled 40% year
over - year order volume growth without hiring additional ops staff
Fulfillment Accuracy — Achieved 99.98% inventory tracking accuracy across all Amazon channels
Prime Day Performance — Successfully processed 120,000+ peak orders in 24 hours with zero API throttles
Client
Our Client
Who we built this for.
Apex Global Commerce (Top 100 Amazon Seller)
E-Commerce & Retail · Enterprise ($50M+ GMV) · Seattle, USA & London, UK
A premier multi-brand retailer managing over 1,200 active SKUs across Amazon US, Canada, Europe, and UK marketplaces.
Client Requirements
- 1
100% automated Amazon order & inventory sync with zero manual CSV uploads
- 2
Handling 50,000+ daily orders with peak capacity for 100k+ Prime Day orders
- 3
Strict Amazon Data Protection Policy (DPP) compliance & AWS serverless infrastructure
- 4
Seamless ERP/WMS integration for multi-warehouse FBM & FBA fulfillment
Solution
Proposed Solution
Our approach and rationale.
Our Approach
A cloud-native serverless integration platform built on AWS Lambda, Amazon EventBridge, and SQS messaging queues. The system authenticates using Login with Amazon (LWA) to obtain Restricted Data Tokens (RDTs), processes SP-API Notifications via SQS webhook feeds, and synchronizes inventory and orders bidirectionally with internal WMS/ERP databases in real time.
Why We Choose This Solution?
- Serverless AWS Lambda architecture ensures zero maintenance costs during low periods and infinite scale during peak sales
- Custom rate-limiting queue algorithm prevents SP-API 429 throttling errors while maximizing request throughput
- Strict adherence to Amazon Developer Security Standards and Data Protection Policy (DPP)
- Proven track record with 60+ successful Amazon marketplace implementations
Benefit of This Solution
Enterprise-grade automated Amazon SP-API integration that scales effortlessly through Q4 peaks, protects seller health ratings, and eliminates manual data entry completely.
Features
Key Features
Core platform capabilities delivered.
Live SP-API Inventory Sync
Sub-second bidirectional stock sync across FBA, FBM, and multi-channel fulfillment warehouses.
Resilient Throttling Queue
Intelligent queue management respecting SP-API rate limits with exponential backoff & RDT authorization.
FBA & FBM Automated Routing
Automated order intake, shipping label generation, tracking number push, and carrier updates.
Automated Catalog & Feed Manager
High-throughput product feed generation, price updates, and listing error resolution.
Returns & Refunds Processing
Automated return request authorization, RMA generation, and restock reconciliation.
Financials & Fee Reporting
Real-time settlement report parsing, Amazon fee auditing, and profit margin analytics.
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