Senior Integration Engineer for COD Commerce System

FREELANCE ROLE: Automation & Integration Engineer

(Twin.so × Lovable × respond.io)

Project Overview

We are building Sh AI, a production-grade Cash-on-Delivery (COD commerce system).

The core application is already built in Lovable.
Automation workflows are designed in Twin.so.
Human agent messaging is handled via respond.io.

We are looking for a senior freelancer to integrate these three systems into a clean, reliable, event-driven architecture — without rewriting or duplicating existing business logic.

This is an integration and systems role, not UI/UX or basic automation.


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Your Role

You will connect Twin.so, Lovable, and respond.io so that:

Lovable remains the single source of truth

Twin.so handles automation, workflows, and routing

respond.io is used only as a human operator inbox

All communication happens via webhooks and APIs

The system is deterministic, logged, and production-ready



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Scope (High Level)

Implement inbound and outbound webhooks between systems

Execute predefined automation workflows in Twin.so

Ensure one-way authority (Lovable decides, others react)

Prevent duplicate events and race conditions

Harden integrations for reliability and failure handling

Deliver clean technical documentation at handoff



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Required Experience

Automation platforms (Twin.so, Zapier, Make, n8n, etc.)

Webhooks and REST APIs

Event-driven system integration

Debugging asynchronous workflows


Bonus:

respond.io or similar inbox platforms

WhatsApp / Meta messaging APIs

COD, logistics, or marketplace systems



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What This Role Is Not

Not UI or design work

Not chatbot prompt writing

Not basic “if-this-then-that” automation

Not greenfield development



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Timeline & Budget

Duration: ~2 weeks

Immediate start preferred

Fixed or weekly contract (based on experience)



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How to Apply

Please send:

1. Examples of similar integrations you’ve done


2. Platforms and tools you’ve worked with


3. Short confirmation that you understand:

Event-driven systems

Single-source-of-truth architecture

Automation vs business logic




Bonus: Briefly outline how you would approach this integration.


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Final Note

This is a real production system, not a demo.
We value clean architecture, discipline, and reliability.