Interviewing as a service: outsourced technical interviews and freelance interviewers, explained

Interviewing as a service (IaaS) means paying an outside company to run some of your interviews, most often the first-round technical interview, with its own trained interviewers, a structured question set and a written report or scorecard for each candidate; your team still decides who moves on. Vendors offering it as of October 2026 include Karat, BarRaiser, Intervue and FloCareer. The interviewers are usually experienced engineers or other specialists who work for the platform part-time or freelance and are paid per interview.

This page explains how it works, compares those four vendors from their own sites, covers the freelance interviewer side, and sets out how to keep scores consistent when some interviews are run by outsiders.

How does interviewing as a service work?

1. You define the role and the bar: skills, level, and what a pass looks like.
2. The vendor builds or adapts an interview plan from its question library and your requirements.
3. Candidates book a slot with one of the vendor's interviewers, often outside your team's working hours.
4. The interviewer runs the session, usually a live video interview with coding or problem solving, and some vendors record it.
5. You receive a report: scores by skill, notes, a recommendation, and sometimes a recording and transcript.
6. Your team decides who goes to the next round, which you usually run yourselves.

The model suits interviews that are repeatable and skills-based. It is a poor fit for the final rounds where team fit, the hiring manager's judgment and selling the role matter most.

Which companies offer outsourced technical interviews?

From each vendor's own site, checked October 2026. Features change; confirm on a demo before you buy.

Some of these vendors also sell AI-led interviews alongside human ones. Those are a different product, with a different evidence and consent picture; see what is an AI interviewer.

When does outsourcing interviews make sense?

• Engineer time is the bottleneck. Each first-round interview costs an engineer an hour plus write-up time; at volume, that is real roadmap time.
• Volume spikes. A hiring push, a new office or campus season can need more interview slots than your team can staff.
• Consistency across locations or partners. One outside bar can be easier to hold steady than many internal interviewers who were trained differently.
• Specialist skills you lack in house. A first hire in a new discipline needs someone who can assess it.

It makes less sense when:

• you hire a handful of engineers a year and the interview is part of selling the team;
• the role depends on deep context about your product that an outsider cannot assess;
• your own rubric is not written down yet, because the vendor will then apply its bar, not yours.

What is a freelance interviewer, and how does the work look?

The people behind these services are typically working engineers and specialists who interview on the side. What the vendors' own recruitment pages say, as of October 2026:

• Intervue describes the work as freelance, lets interviewers choose their hours, pays per interview, and estimates earnings of "$1000 - $8000 per month, depending on the time they allocate" (Intervue). That is the vendor's estimate, not a market figure.
• Karat recruits "Interview Engineers" who interview "all on your schedule" after a four-step onboarding: learning Karat's standards with a mentor, practice, an apprentice stage with early-career candidates, then advanced interviews from a question library (Karat). Pay is not published.
• BarRaiser says its experts are compensated "for every interview" and go through expert interview training (BarRaiser). Pay is not published.
• FloCareer has a "Join as Interviewer" sign-up for its expert network (FloCareer).

If you are an engineer considering it, check your employment contract for outside-work and conflict-of-interest rules, and whether you could end up interviewing candidates for a competitor of your employer.

How do you keep scoring consistent with an outside vendor?

The risk with outsourced interviews is two bars: the vendor's and yours. Candidates who pass the vendor round then fail your onsite at a high rate, or the reverse. Five practices keep the two aligned:

1. One rubric, written by you. Give the vendor the same competencies, levels and anchored score descriptions your own interviewers use; see the software engineer interview scorecard and what is a structured interview.
2. Calibrate on the same interviews. Have your interviewers and the vendor's score the same recorded or sample interviews independently, then compare and agree the differences; the agenda is in interview calibration session.
3. Evidence for every score. A score without the candidate's words or work behind it cannot be checked. Ask for notes that quote what the candidate said or did.
4. Track the hand-off. Each quarter, compare the vendor's pass rate and your later-round pass rate for the candidates it advanced. A widening gap means the bars have drifted.
5. Keep the decision yours. Treat the vendor's recommendation as one input, and record the reason for every advance or reject. How to score interviews consistently covers the scoring habits that make this work.

The same discipline helps when you bring interviews back in house. Interview Signal, which we make, builds the question guide from the job description, fills a scorecard during the call and ties each score to the candidate's own quotes, so in-house interviewers produce the same kind of evidence a vendor report would.

Risks and compliance to check

• Recording and consent. BarRaiser says it records every interview, and FloCareer offers recordings with transcripts. Candidates in all-party consent states must be told and agree; see is it legal to record a job interview.
• AI features. Some vendors add AI analysis, proctoring or AI-led rounds. Ask exactly what is automated, what the candidate is told, and whether any automated output affects the decision, because AI hiring rules in some states and cities attach to those uses.
• Candidate data. Ask where recordings, code and reports are stored, for how long, and who can see them.
• Candidate experience. Candidates meet a stranger from another company first. Tell them in advance who will interview them and why.
• Accommodations. Confirm the vendor can provide reasonable accommodations, such as extra time or a different format, when a candidate asks.

How do you run a fair pilot?

1. Pick one role and level with steady volume, so results are comparable.
2. Hand over your rubric first, and hold one calibration session before any live candidate.
3. Split the flow: for a set period, send some candidates to the vendor round and some to your own first round, assigned by a rule fixed in advance (for example, alternate candidates), not by recruiter choice.
4. Measure the same things for both groups: pass rate, time from application to first interview, later-round pass rate, offer acceptance and candidate feedback.
5. Read a sample of reports blind, without knowing which came from the vendor, and ask whether each score is supported by the evidence written down.
6. Decide on the numbers you agreed at the start, not on how the pilot felt.

Questions to ask a vendor before a pilot

1. Can you use our rubric and score anchors, or only yours?
2. Who are the interviewers for our roles, how are they trained, and how is their scoring audited?
3. Is every interview recorded? How is consent obtained, and where is the recording kept?
4. What is in the report, and how quickly do we get it?
5. What does a pilot of 20 to 30 interviews cost, and how will we compare results with our own interviewers?
6. Which parts, if any, are automated or AI-assisted?