Open Letter Connect
Serverless direct-mail engine enabling unlimited USPS-verified campaigns with 99.8 % delivery success.
The Story
As Technical Lead, I architected and implemented a horizontally auto-scaling mail-processing backend on AWS Lambda, enabling unlimited direct-mail campaigns. I designed a dedicated microservice for USPS-verified address validation to boost deliverability, built a personalization engine for dynamic variable-data injection, and created a pluggable CRM connector framework for HubSpot and Salesforce. On the front end, I led development of a React-based drag-and-drop template builder and integrated a real-time analytics dashboard via WebSockets to provide sub-second campaign metrics and insights. :contentReference[oaicite:0]{index=0}
The Problems We Tackled
Every great solution begins with understanding the core challenges that need to be addressed.
Challenge 1
Designing a fully autoscaling, multi-tenant mail backend to support unlimited concurrent campaigns
Challenge 2
Achieving 99.8% delivery through real-time USPS address validation and retry logic
Challenge 3
Integrating dynamic personalization and bi-directional CRM sync without adding friction to the user workflow
Challenge 4
Delivering real-time analytics for campaign performance with sub-second metrics under high load
How We Solved It
Strategic approaches and innovative solutions that transformed challenges into opportunities.
Solution 1
Engineered an AWS Lambda + SQS microservice architecture with auto-scaling policies to handle unlimited throughput
Solution 2
Built a dedicated USPS validation service with fallback retry and correction logic to ensure maximum address accuracy
Solution 3
Developed a variable-data personalization engine and a modular CRM connector layer for seamless HubSpot & Salesforce integration
Solution 4
Implemented WebSockets + DynamoDB streams for a real-time analytics dashboard, providing campaign tracking and engagement insights
The Outcome
Measurable impact and transformative results that exceeded expectations.
Impact & Results
Result 1
Enabled unlimited direct-mail campaign throughput with zero per-campaign caps
Result 2
Maintained a 99.8% delivery success rate through USPS-verified addresses and automated retries
Result 3
Reduced campaign setup and launch time by over 50% with the React drag-and-drop builder
Result 4
Streamlined contact management by automating sync with HubSpot & Salesforce, eliminating manual imports
Result 5
Delivered sub-second analytics and reporting, empowering data-driven campaign optimizations
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