Inbox Pull
Gmail API SaaS Platform for Mailbox Ingestion, Campaign Sequencing & Funnel Analytics
Email Marketing / SaaS
Inbox Pull
Web Application (Next.js & Bun)
Next.js, React, TypeScript, Tailwind CSS
Managing High-Throughput Gmail Ingestion with Clean Campaign Workflows
Building email marketing software requires balancing third-party API rate limits, secure OAuth token management, and low-latency analytics aggregation across thousands of sent and received messages.
- Integrating Google Gmail API OAuth 2.0 with secure token refresh and granular scope management.
- Ingesting inbox activity data without exceeding Google API rate limits or triggering quota throttling.
- Building a dynamic email template editor supporting live merge variables (e.g. `{{company}}`, `{{first_name}}`) and rich text styling.
- Aggregating real-time campaign performance metrics including open rates, click rates, reply rates, bounce rates, and spam rates.
- Constructing a high-speed backend using modern TypeScript runtimes (Elysia.js & Bun) for rapid webhook and API execution.
A High-Speed Marketing SaaS Dashboard with Gmail API Ingestion & Funnel Analytics
Frontail designed and implemented the full Inbox Pull application, uniting a modern Next.js user interface with an ultra-fast Bun and Elysia.js API layer.
Gmail API OAuth Integration
Implemented secure OAuth 2.0 authorization allowing users to connect Google Workspace mailboxes with automated token rotation and inbox synchronization.
Multi-Status Campaign Manager
Engineered campaign lifecycle controls categorizing outreach series into Active, Drafts, and Archived states with individual status pills (`Active`, `Paused`, `Draft`).
Dynamic Template Builder
Developed an email editor with variable injection (`{{company}}`, `{{first_name}}`), rich text formatting, preview mode, and direct template library management.
Conversion Funnel & Time-Series Analytics
Built real-time metric cards (Emails sent: 8,432, Open rate: 62.8%, Click rate: 24.6%, Reply rate: 11.3%) paired with time-series activity charts and recipient conversion funnels.
Features & Capabilities
Key Product Features Built
Gmail API Mailbox Ingestion
Direct connection to Google Workspace mailboxes for synchronized activity monitoring and event capture.
Campaign Sequence Management
Multi-stage outreach campaigns with live status controls, target recipient lists, and warmup tracking.
Dynamic Variable Template Editor
Rich text template designer supporting customizable merge variables and instant preview capabilities.
Funnel Performance Analytics
Comprehensive KPIs tracking Open, Click, Reply, Bounce, and Spam rates with comparative benchmarks.
Time-Series Activity Visualization
Synchronized line graphs charting Sent, Opens, and Replies over 30-day rolling windows.
Inbox Warmup & Activity Logs
Dedicated monitoring for mailbox warmup health, sender configurations, and deliverability events.
High-Performance Bun & Elysia.js Backend with Next.js Frontend
The system leverages Bun's native execution speed and Elysia.js for low-overhead HTTP routing alongside Next.js for dashboard rendering.
Frontend Application Layer
Renders the campaign dashboard, template authoring suite, and interactive analytics visualization panels.
High-Speed API Service
Handles Google OAuth callbacks, incoming webhook events, and fast JSON payload delivery with minimal overhead.
Google Integration Layer
Manages mailbox connections, thread history ingestion, and secure sender credential storage.
Key Engineering Challenges & Solutions
Managing Gmail API Rate Limits During Bulk Ingestion
Implemented batch request handling and intelligent backoff algorithms to synchronize mailbox records without exceeding API quotas.
Real-Time Funnel Calculation Across Large Recipient Lists
Aggregated email event counts asynchronously to serve pre-calculated analytics metrics instantly to the dashboard.
Technology Breakdown
Technology Stack & Tools
Frontend UI
- Next.js
- React
- TypeScript
- Tailwind CSS
Backend & Runtime
- Elysia.js
- Bun Runtime
- REST APIs
Third-Party Integrations
- Google Gmail API
- OAuth 2.0
Visualization & State
- Time-Series Charting
- Lucide React
Delivered Capabilities & Final Product
SaaS Outreach Dashboard
Full-featured web application for managing email campaigns, templates, and sender accounts.
Gmail API Integration Pipeline
OAuth 2.0 authentication and mailbox ingestion engine connecting to Google Workspace.
Dynamic Email Template Builder
Rich text editing component with variable insertion and template library persistence.
Funnel & Time-Series Analytics Suite
Real-time engagement tracking with visual conversion funnels and rolling activity charts.
Frontail Capabilities
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