AI Voice Agent Full Stack Engineer — Twilio + Webhooks + LLM — Contract/Part-time (Lovable.dev) - Contract to Hire

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Ulio is an AI receptionist builder. Users and agencies build and deploy phone based receptionists for real businesses. This is a builder platform, not a single bot.

I’m looking for a versatile full stack engineer who can take tasks end to end and ship independently across backend, frontend, integrations, and reliability.

Work style and engagement

On demand, not a retainer. I will message you when there is a task

You reply with a quick plan plus an estimate in hours and an ETA before starting

After I approve, you complete it and send a PR plus short how to test notes

Clear communication and ownership matter more than meetings

Billing options

Option 1 Hourly on demand

You only bill time when I request a task

Use Upwork time tracker for all billable time

Manual time is not allowed unless I explicitly approve it for something like a call

Weekly hour limit will be set per week based on the task, typically small

Option 2 Fixed price per task

We agree on a deliverable and price for each task

Payment is tied to the completed deliverable

What you will build and maintain

Twilio voice integration and call handling

Webhooks and third party API integrations

Reliability foundations: idempotency, retries, event logging, replay, failure visibility

Builder features: templates, settings, routing rules, admin tools, usage views

Debugging production issues and hardening edge cases

First task examples

Webhook reliability foundation: store webhook events, idempotency guard, basic replay for failures

Call visibility: track Twilio call status events and make it easy to trace one call end to end

Required skills

Shipped production SaaS features

Strong with webhooks, async flows, retries, and debugging real incidents

Can work across backend and frontend as needed

Clean communication, can operate with minimal handholding

Nice to have

Twilio Voice, IVR, call routing, status callbacks

Experience with LLM integrations, timeouts, fallbacks

Observability and logging mindset

Experience building multi tenant builder products

How to apply

Please send

1 one to two relevant projects you shipped

2 one gnarly bug story what broke and how you fixed it

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