Voice AI for HR Screening | AI Phone Interviews

Voice AI for HR Screening

A recruiter spending 4 hours a day on first-round phone screens is spending 4 hours listening to answers they already have rubrics for. The same 8 questions, the same scoring criteria, delivered manually to every candidate. That's what voice AI was built for.
RaftLabs builds AI phone screening systems that conduct structured first-round interviews at scale. 300+ screens per week. 60% reduction in recruiter screening time. Candidates screened within hours of applying, not days.

See our work
  • Structured phone screen conducted by AI, same questions, same scoring, every candidate, no scheduling required

  • Candidates screened within hours of applying, not days, reduces drop-off from slow response times

  • ATS integration, ranked summaries written directly to Lever, Greenhouse, or Workday Recruiting

  • Recruiter reviews a scored summary PDF, not a recording, 10 minutes of review instead of 30 minutes of listening

Recent outcomes

Voice AI · High-volume recruiting platform

Built AI phone screening system conducting 300+ structured first-round interviews per week with ATS integration into Greenhouse.

60% less recruiter screening time

Conversational AI · Enterprise HR team

Deployed AI chatbot handling routine HR queries, candidate screening questions, and scheduling - without human intervention.

70% queries handled autonomously

Voice AI · Group decision platform (PSi)

Anonymous voice platform for structured group decisions at scale, shipped in 14 weeks and handling 300+ concurrent users.

75% faster decisions
4.9 / 5 on ClutchSee our work

The problem

Sound familiar?

  • Recruiting team spending half their week on first-round screens that could be standardised into a rubric?

  • Candidates dropping out because the scheduling wait between application and first contact is too long?

The short answer

RaftLabs builds voice AI phone screening systems for HR teams in the US, UK, and Australia. Deployments conduct 300+ structured first-round interviews per week, cutting recruiter screening time by 60%. Scored summaries write directly to Lever, Greenhouse, or Workday - no recordings to review.

Updated June 2026

Trusted by

Vodafone
Nike
Microsoft
Cisco
T-Mobile
Aldi
Heineken
GE

Voice AI development, by the numbers

faster decisions with voice AI - PSi case study
75%
reduction in inbound call costs with Call Eva
80%
rated by clients on Clutch
4.9/5
years shipping conversational and voice AI products
9+

300+ screens per week, without adding headcount

First-round phone screening is the most automatable step in recruiting. The questions are standardised. The rubric is defined. The output is a pass/fail plus a few key quotes. What varies between candidates is their answers, not the structure of the conversation.

A recruiter running 20 screens a day is a human API for a process that doesn't need to be human. The time they spend on that is time not spent on closing candidates, managing the offer process, or building the hiring manager relationship.

We built a voice AI screening system running 300+ structured first-round interviews per week. Candidates screened within hours of applying. Recruiters reviewing a scored summary, not a recording.

Capabilities

What we build

Structured AI phone interviews

Configurable question sets per role type, asked in the same order with the same follow-up logic for every candidate. The AI adapts naturally, handles interruptions, asks for clarification when an answer is vague, and manages candidates who talk extensively on one question. Conversation flows are designed to feel like a real phone screen, not a phone menu. Disclosure that the interviewer is AI is built into the opening, it's mandatory and delivered naturally rather than as a disclaimer. Post-call pipeline: Deepgram transcription, GPT-4o response evaluation against your rubric, ranked summary written to the ATS.

Configurable scoring rubrics

Scoring criteria defined per role type in collaboration with your recruiting and hiring manager teams during the configuration phase. Each question mapped to a competency; each answer scored against defined indicators (what a strong answer looks like vs. a weak one). Scores aggregated into a candidate ranking with supporting quotes from the transcript. Rubric updates, new questions, revised scoring criteria, new role types, managed through an admin interface without engineering involvement. Scoring methodology documented for EEOC audit purposes in US deployments.

ATS integration

Native integrations with Lever, Greenhouse, and Workday Recruiting. Screens triggered automatically on new application events via webhook. Scored summaries written to the candidate profile as evaluation notes at call completion. Stage progression updated automatically based on score threshold rules. Recruiters open the ATS, see a ranked candidate list, and review a one-page summary per candidate, they don't need to log into a separate system. For custom or less common ATS platforms, we build the integration.

Multi-timezone, high-volume concurrency

The system handles unlimited concurrent screens, there's no queue when 50 candidates are invited to screen simultaneously. Outbound call scheduling respects local time zones and TCPA/GDPR time-of-day restrictions. Answering machine detection routes to a callback or SMS follow-up if the candidate doesn't pick up. Candidates who didn't answer are retried once on a configurable schedule before the invitation expires. For high-volume roles (retail, warehouse, seasonal hiring), this means the entire applicant pool is screened within 48 hours of the role going live rather than over 2-3 weeks.

Recruiter review interface

Dashboard showing all completed screens with candidate name, role, score, recommendation (advance/hold/decline based on your thresholds), and the key quotes from the transcript that drove the score. One-page PDF summary per candidate exportable for sharing with hiring managers. Full transcript available for any candidate the recruiter wants to review in detail. Bulk stage progression, advance all candidates above the score threshold in one action. Time saved: 10 minutes of review per candidate instead of 30 minutes of listening.

Compliance and data governance

GDPR-compliant data handling: candidate consent captured, retention periods configurable, deletion on schedule. TCPA-compliant outbound (US): time-of-day restrictions, consent verification, Do Not Call registry checks. EEOC considerations (US): screening questions reviewed for protected class neutrality, scoring criteria documented for audit. AI disclosure built into the opening of every call as standard. Compliance documentation produced for your legal team's review before go-live. Data stored in your infrastructure, not ours, after project handover.

How we work

From scope to shipped

Every project follows the same four phases. Scope is locked and price is fixed before development starts.

  1. Week 1
    01

    Discovery and scope

    We map your screening process, role types, and scoring criteria. You leave week 1 with a written scope document, a configured question library outline, and a fixed-price quote. No development starts without your sign-off.

  2. Weeks 2-3
    02

    Configuration and design

    Question sets, scoring rubrics, and ATS integration logic designed in collaboration with your recruiting team. The call flow, disclosure language, and admin interface are specced and approved before any code is written.

  3. Weeks 4-10
    03

    Build, integrate, and QA

    Call infrastructure built on Twilio, transcription via Deepgram, evaluation via GPT-4o. ATS webhooks and summary-writing logic integrated and tested against your staging environment. Compliance documentation produced for legal review.

  4. Weeks 10+
    04

    Launch and post-launch support

    Production deployment with monitoring activated on launch day. First live screens supervised. 8 weeks of post-launch support included - question adjustments, rubric tuning, and new role type additions at no extra cost.

Why us

Why recruiting teams choose RaftLabs

  1. Senior engineers build what they scope

    The engineers who assess your screening process also build the system. No bait-and-switch, no offshore handoff after the contract is signed. The team you meet in week 1 ships in week 10.

  2. Fixed price before development starts

    We scope the work, calculate the cost, and lock it in writing before any development starts. A scope change is a change request: priced, agreed, or dropped. It never absorbs into the project and appears on the final invoice.

  3. 9 years and 100+ products shipped

    Clients include Vodafone, T-Mobile, Aldi, Nike, Cisco, and Lockheed Martin. Track record across AI, voice, automation, and enterprise platforms in healthcare, fintech, logistics, and HR tech.

  4. Compliance built in from the start

    GDPR, TCPA, and EEOC compliance requirements are scoped in week 1, not retrofitted before launch. We produce the compliance documentation your legal team needs to review the system before go-live.

How many first-round screens is your team running this month?

Tell us your role types, your current screening questions, and your ATS. We'll scope the build and give you a fixed cost.

What clients say

What clients say about working with us

Three-year average engagement. Founders and operators describing the work in their own words. No marketing varnish.

Nuala C.
Nuala C.
Ireland flagIreland
Director, BrandFire

Incredibly simple and easy to use app. Exactly what we were looking for.

01 / 06

Voice AI for HR Screening, scoped in one call.

Tell us what's broken. Within one business day you get a straight take on cost, timeline, and the right first step. No deck, no pressure.

Stay on topic

More on HR & recruiting

Frequently asked questions

When a candidate applies, the system sends an SMS or email with a link to schedule the AI phone screen, or calls them directly if your process calls for immediate outreach. The AI conducts a structured interview: it asks your configured screening questions, follows up on answers that need clarification, handles interruptions and off-topic responses naturally, and adapts the conversation flow based on the role type. After the call, a transcription pipeline runs (Deepgram), responses are scored against your rubric (GPT-4o evaluation), and a ranked summary is written to the ATS. The recruiter sees a scored candidate profile with the key quotes from the call, not a raw recording. The process takes the same time as a human screen, 15-20 minutes per candidate, but runs at unlimited concurrency, any time of day.

Yes. Question sets and scoring rubrics are configured per role type. A retail associate screen asks different questions and weights different attributes than a software engineer screen or a warehouse operative screen. We build the question library and scoring logic in collaboration with your recruiting team, typically in a 2-week configuration phase before the system goes live. The configuration is managed through an admin interface, your recruiting team can adjust questions, add new role types, and update scoring criteria without engineering involvement.

Disclosure is mandatory and built in, the system identifies itself as an AI screening tool at the start of the call. In our deployments, drop-off rates from disclosure are lower than drop-off from scheduling delays (the average time-to-first-contact for manual screening is 3-5 business days; AI screening contacts within hours of application). Candidates who complete the screen and move forward report the experience positively because it's fast, structured, and available on their schedule, 11pm screens are common. Candidates who weren't going to progress typically don't object to the format.

We integrate natively with Lever, Greenhouse, and Workday Recruiting for candidate profile updates, stage progression, and summary note writing. For Workday: we use the Candidate REST API to write scored evaluation notes and progress candidates between stages. For Lever and Greenhouse: we use their webhook + API combination to trigger screens on new application events and write feedback at completion. For custom or less common ATS platforms, we build the integration. We also integrate with LinkedIn Talent Hub, SmartRecruiters, and iCIMS on request.

The system is built with compliance as a design constraint, not an afterthought. GDPR: candidates are informed that the call will be processed by AI, transcribed, and the summary stored. Data retention periods are configurable per your policy, transcriptions and summaries are deleted on schedule. TCPA (US): outbound call timing restrictions, consent verification, and Do Not Call registry checks applied automatically. EEOC (US): scoring rubrics are reviewed to avoid questions that would capture protected class information; the evaluation criteria are documented for audit purposes. We produce the compliance documentation your legal team needs to review the system before go-live.

A focused build for a single role type, question set, scoring rubric, one ATS integration, and the call infrastructure, typically runs $15,000--$35,000 and takes 6-10 weeks. A multi-role-type platform with a question library, recruiter admin dashboard, configurable rubrics, and multiple ATS integrations typically runs $30,000--$60,000. Per-call infrastructure costs (Twilio, Deepgram, GPT-4o) run approximately $0.30--$0.80 per completed screen depending on call length and the number of follow-up evaluations, substantially less than the all-in cost of a recruiter hour.

Work with us

Tell us what you need. We'll tell you what it would take.

We scope Voice AI for HR Screening in 30 minutes. You walk away with a clear cost, timeline, and approach. No commitment required.

  • Scope and cost agreed before work starts. No surprises. No obligation.
  • Working prototype within 3 weeks of kickoff.
  • Pay by milestone. You see progress before each invoice.
  • 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
  • All conversations are NDA-protected.