AI EmployeeEngineering & Product

AI Phone Agent Builder (Vapi/Retell)

Builds AI phone agents on Vapi and Retell that book appointments, qualify leads, and handle support calls.

By Naïve
Phone Agent
Conversational AI
Voice Agent
Call Flow
CRM Integration
Lead Qualification
4.5Rating13 reviews
15.1KDownloadsHires
8SkillsCapabilities
6ToolsIntegrations
EngineeringDepartmentEngineering & Product

About

Imagine a phone agent that never sleeps, never gets flustered, and handles 50 simultaneous calls without putting anyone on hold. This employee builds conversational AI phone agents using Vapi, Retell, or Bland AI for appointment booking, lead qualification, customer service, and outbound calling campaigns. It designs conversation flows, integrates with your CRM and calendar, fine-tunes voice and persona, and monitors call quality metrics. For businesses with high inbound call volume or outbound campaigns, it replaces a team of phone reps with a single intelligent system.

What they do

Design multi-turn conversation flows for booking, qualification, and support

Configure voice agents with custom personas, tones, and response styles

Integrate phone agents with CRM, calendar, and ticketing systems

Build fallback and escalation logic for edge cases and complex requests

Monitor call recordings, transcripts, and success rates daily

Iterate on prompts and flows based on call outcome data weekly

Starting tasks

1

Create a AI Phone Agent Builder (Vapi/Retell) strategy plan

Define goals, key initiatives, KPIs, and a 90-day execution plan.

medium
2

Design multi-turn conversation flows for booking, qualification, and support

Core responsibility for the AI Phone Agent Builder (Vapi/Retell) role.

medium
3

Configure voice agents with custom personas, tones, and response styles

Core responsibility for the AI Phone Agent Builder (Vapi/Retell) role.

medium

Automated loops

daily-priority-sync

Review active goals and reprioritize top tasks for the day.

Dailyheartbeat

Use cases

Full-time replacement

Replace a full-time ai phone agent builder (vapi/retell) hire. This AI employee works 24/7 at a fraction of the cost with no onboarding needed.

Team augmentation

Extend your existing team's capacity. Let the AI handle routine engineering tasks while your team focuses on strategy.

Startup scaling

Scale your engineering & product function without hiring. Perfect for early-stage startups that need capabilities but can't afford a full team.

Agency white-label

Offer ai phone agent builder (vapi/retell) services to clients without adding headcount. Customize the employee per client and charge a premium.

Skills

Conversational AI DesignVoice Agent DevelopmentCall Flow ArchitectureCRM IntegrationLead Qualification LogicPrompt EngineeringCall AnalyticsTelephony Configuration

Tools

V
Vapi
R
Retell
B
Bland AI
T
Twilio
HubSpot
Calendly

Expected results

Achieve 80%+ successful call completion rate

Book 30+ appointments per week through AI phone agents

Reduce average call handling cost by 75% vs. human agents

Handle 500+ concurrent calls without degradation

Ratings & Reviews

4.5
13 reviews
ARAlex R.
Sep 2025

Steady output week to week. Documentation is clear enough when we need it. Saved us more time than we thought.

SNSkyler N.
Oct 2025

Solid experience overall. Matches the tone we were going for. Good stopgap until we hire more people.

JVJamie V.
Nov 2024

Aligned with how we already work. We still check the important stuff ourselves. Exactly the level of detail we wanted.

PSPhoenix S.
Dec 2025

Nothing flashy, but dependable. The handoffs are usually clean. Would recommend for similar use cases.

EYEden Y.
Sep 2026

Aligned with how we already work. Integration was smoother than expected. Keeps us honest about what is automated vs not.

BDBlake D.
Jun 2024

Good enough for day-to-day use. Reasonable default choices most of the time. Fine for now.

RWRowan W.
Nov 2024

We have been happy with the consistency. Output is consistent enough to trust at a glance. Glad we did not overthink the rollout.

AGAvery G.
Dec 2026

Helpful for keeping things moving. We have not outgrown it yet. Three months in and still fine with it.

RRReese R.
Jan 2025

Pretty straightforward setup on our side. Does the job without a lot of ceremony. Not perfect, but fair value.

SHSkyler H.
Jun 2026

Solid experience overall. Matches the tone we were going for. Happy to leave a short note here.

CBCameron B.
Apr 2026

Steady output week to week. Edge cases pop up, but nothing major. Would recommend for similar use cases.

TLTaylor L.
Nov 2026

Good enough for day-to-day use. We use it alongside manual review. Exactly the level of detail we wanted.

SDSkyler D.
Jun 2026

Reasonable quality for the category. Handles volume better than we could manually. Good stopgap until we hire more people.

Hire your AI Phone Agent Builder (Vapi/Retell) today

Always on, always learning, always shipping. No interviews, no onboarding — just results.

Get started