If you’re evaluating the best interview-as-a-service platforms in 2025, you’ll notice the space has grown crowded. With hiring bottlenecks costing companies millions, platforms like Intervue, Karat, and HackerRank Interview are redefining how businesses scale structured technical interviews.

Enter Interview-as-a-Service (IaaS). These platforms provide on-demand, structured, and scalable interviewing support. They give companies the power to evaluate candidates effectively without burning out internal teams.

The market is crowded in 2025, with multiple players promising to fix the hiring crunch. We reviewed the top 10 Interview-as-a-Service platforms to uncover their strengths, their gaps, and why Intervue is emerging as the most complete solution.

Several trends are pushing companies to adopt IaaS at scale.

First, remote-first workforces have expanded talent pools across continents. Traditional interview setups struggle to manage scheduling, time zones, and consistency across borders.

Second, the engineering bandwidth crisis is real. Every hour an experienced developer spends interviewing is an hour lost from product delivery. In competitive markets, that lost time can mean delayed launches or slower growth.

Finally, the shift to skills-first hiring has taken hold. Employers are moving away from resumes and degrees as proxies, demanding proof of ability through structured, rubric-driven assessments. That makes Interview-as-a-Service a critical enabler of fair and effective hiring.

1. Intervue

Among all Interview-as-a-Service platforms in 2025, Intervue stands out as the most complete solution for fast-growing companies and enterprises. Unlike platforms that focus only on assessments or coding environments, Intervue was purpose-built to solve the bandwidth crunch faced by engineering and talent teams.

At its core, Intervue provides three critical advantages:

1. Live technical interviews that feel collaborative: Candidates work in a real-time coding environment designed to mimic how developers actually solve problems. This reduces the test-like feel common in many platforms, improving candidate experience and employer brand perception.
2. Structured rubrics for fairness: Every interview is scored against standardized rubrics, eliminating subjectivity and reducing bias. For hiring managers, this ensures apples-to-apples comparisons across candidates.
3. External interviewer panels: Perhaps the most unique differentiator, Intervue offers access to trained external interviewers. This frees up internal engineering bandwidth, so senior developers can stay focused on building products while still ensuring high-quality evaluations.

The platform also provides SLA-driven reporting and detailed analytics, giving CHROs and Heads of Talent visibility into time-to-hire, interviewer performance, and funnel efficiency.

It’s no surprise that Intervue is trusted by high-growth and enterprise leaders alike, including Razorpay, Rakuten, NPCI, Upstox, Nykaa, and British Petroleum. These companies span fintech, BFSI, consumer tech, and enterprise services — showing Intervue’s ability to scale across industries.

In 2025, when hiring speed, candidate experience, and fairness are equally important, Intervue has become the platform many CHROs and VPs of Engineering describe as the “must-have infrastructure for modern tech hiring.”

2. Karat

Karat is often considered the pioneer of Interview-as-a-Service. It built its brand around trained professional interviewers and enterprise-grade scalability. However, its model comes with high costs that limit accessibility for mid-market teams. The structured approach is effective at scale but can feel rigid for candidates.

3. HackerRank

Best known for coding assessments, HackerRank also offers interview capabilities. The platform provides a large library of problems and is widely recognized among developers. The limitation is that it feels more like a testing tool than a collaborative interview solution, making it less effective for senior or niche roles.

4. CoderPad

CoderPad is widely used as a coding environment and has grown into a lightweight interview tool. It is intuitive and developer-friendly but lacks features like external interviewer networks or deep analytics. It works best as a coding pad rather than a full Interview-as-a-Service platform.

5. Turing

Turing primarily operates as a global talent marketplace but bundles interview services within its offering. It gives companies access to vetted talent and supports evaluation. However, it leans more toward outsourcing than pure IaaS, which means less control for in-house hiring leaders.

6. BarRaiser

BarRaiser is an Interview-as-a-Service platform known for its structured interviews and calibrated interviewer network. It emphasizes reducing interviewer bias and improving hiring quality by offering real-time feedback and detailed analytics after each interview. BarRaiser standardizes interviews across roles and teams, making it useful for organizations that want predictability in evaluations. However, its approach can feel rigid for companies seeking more flexibility, and it is not as candidate-first as some newer platforms.

7. Adaface

Adaface is positioned as a conversational screening tool, using AI-driven assessments to filter candidates early in the process. It is affordable and easy to adopt, but it does not go deep enough for technical interviews or solve the bandwidth challenges faced by engineering teams.

8. CodeSignal

CodeSignal is a well-known coding assessment provider that has added interview features. Its strength lies in its extensive library and recognition within developer communities. However, its DNA remains assessment-first, and it lacks the structured interviewer support required for large-scale hiring.

9. InterviewVector

Interview Vector is an Indian-origin provider that offers external interviewer support. It is particularly useful for startups looking for affordable services in local markets. Its challenge lies in scaling globally and in product sophistication, which is behind some of the larger players.

10. Vervoe

This emerging platform combines assessments with interview functionality. They are simple to use and cost-effective for small and mid-sized businesses. However, their limited features and lighter analytics make them less suited for enterprise-level hiring needs.

Each of these platforms brings value in different areas, but Intervue has been built specifically for the realities of modern hiring. It stands out in four critical ways:

• Scalability without burnout: Intervue’s external panels ensure engineering leaders stay focused on product rather than endless interviews.
• Fairness through structure: Rubric-driven evaluations provide consistency and reduce bias, enabling apples-to-apples candidate comparisons.
• Candidate-first design: Live coding interview feels natural and engaging, leading to better candidate experience.
• Insights for leaders: Detailed reports and SLA-driven analytics help CHROs and Heads of Talent measure efficiency and make data-backed hiring decisions.

The proof lies in adoption. Companies across fintech, BFSI, consumer tech, and enterprise services have made Intervue an integral part of their hiring process, demonstrating its effectiveness in high-pressure, high-scale environments.

The next wave of hiring innovation will revolve around AI-driven insights, bias reduction, and global interviewing at scale. Interview-as-a-Service will no longer be a niche experiment but a mission-critical component of talent acquisition strategies.

Companies that want to stay ahead will need platforms that combine scalability, fairness, and candidate experience without compromising on quality. While Karat, HackerRank, and CoderPad each solve part of the problem, Intervue is emerging as the platform that brings all the essentials together in one place.

For hiring leaders, the real question in 2025 isn’t whether to adopt Interview-as-a-Service. It’s who to trust as a partner in scaling it. Increasingly, that answer is Intervue.