TL;DR: Wellfound built an AI video interview feature to help candidates stand out beyond paper credentials. Mux transcription enables the key workflows: summarizing answers, generating clips for recruiters, and providing feedback to candidates. The feature went from prototype to launch in a week.
Resumes aren't great at predicting job fit. Companies know this — that's why they interview. But when hundreds of applications come in, it's easy to subconsciously fall back on shortcuts: brand-name companies, recognizable schools. Some qualified candidates can get overlooked.
Companies miss out on candidates who could be an even better fit — like the industry changer who can bring a fresh perspective, the person whose eagerness can’t be taught, or whose leadership style is just what the team needs.
Wellfound thinks video can help. The startup job marketplace recently launched an AI video interview feature, built on Mux. Candidates who might have otherwise been passed over on paper get a chance to tell their story.
What is an AI interview?
Instead of doing an AI interview for every job (because who wants that?), Wellfound allows candidates to do one interview that’s broad enough for all the jobs they apply to on the platform.
Think of it like an HR screener, where you share things like what you’re looking for in your next role and recent projects you worked on. The AI interviewer will ask follow-up questions if it notices the prompt wasn’t quite answered or that there’s an opportunity to drill deeper into an answer.
“The hope was that we could help candidates tell their story better and companies could see this is a real person on the other side,” said Amit Matani, Wellfound’s CEO.
The interview is only seen by companies you share it with and reviewed by a real person on the hiring team, not AI. Plus, candidates get custom feedback to help them with future interviews. After each interview, the system generates notes on what they did well and where they could improve.
“We really wanted to make it feel like a candidate-first product,” Amit said.
While the interview can be one and done, you can re-record or update your interview as often as you’d like.
How transcripts changed the game for video interviews
A few years ago, Wellfound experimented with asynchronous video — candidates would record answers to questions on their own time. But nobody watched them — recruiters weren't sitting through 15-minute videos for every applicant.
Now, Wellfound has the features to make video interviews useful — especially transcripts.
The interview is conducted by an AI recruiter. Once it's done, the video goes through Mux, which handles:
Transcription: Wellfound runs auto-generated transcripts through an LLM to summarize each answer and generate feedback for candidates.
"There's so much you can do with a transcript now — summarize, extract, clip, gather insights," Amit said. "That's the biggest part of the use case."
Clipping: Recruiters can hop into specific pre-clipped sections of the interview instead of scrubbing through the whole thing. Using the context from the transcripts, Wellfound uses Mux’s frame-accurate clipping feature to provide relevant clips to the recruiters.
Auto-captions: Just like scrolling Instagram with the sound off, recruiters can skim interviews without needing audio.
Recruiters have told the Wellfound team that because of the AI interview, they were able to match with candidates they may not have otherwise considered, and on the flipside, skipped over someone who looked good on paper.
They’ve also heard great feedback from candidates who especially like the feedback feature. In a time where candidates are often applying for dozens or hundreds of roles, tangible, honest feedback is hard to come across.
A founder built with Mux in a weekend
“I just looked at the API, I was like, oh, this is actually a lot easier than I thought it would be,” Amit said.
After discussing the idea with his team, Amit — eager to test if the idea would even work — vibe coded the feature over the weekend.
Come that Monday, an engineer cleaned up the code over the course of the week, and the team launched shortly after.
“Had your API been harder, I don't know if we would have actually gotten the feature done, certainly not as easily,” Amit said. “We might not have done it at all, but Mux removed the barrier to entry. It was great to work with an API that was so straightforward, feature-rich, and well-documented.”
Plus, the pricing just made sense.
“It doesn't feel like you guys are trying to nickel and dime,” Amit said.
Not only is the pricing fair, Amit said, but he specifically appreciates the Cold Storage feature.
Realistically, after someone lands a job, no one is watching their interview on the platform anymore, at least not until it’s time to look for their next role and update their recording. During that time, Mux automatically moves the video into a cheaper storage tier.
“I just don't have to think about it, I don't have to worry about it, Mux just gets it done, which is really nice,” Amit said.
What’s next for Wellfound and video
After seeing how easy it was to integrate video, Amit and his team are exploring other ways video can bring more humanity into recruiting.
Wellfound is already using the same Mux pipeline for company pitch videos — where founders explain why their startup is worth joining. These get clipped and included in candidate outreach.
Currently, they’re exploring adding video to company pages so candidates can learn more about a company’s mission, if it would be a good cultural fit, and get a feel for their potential future colleagues.
“Mux has opened up a lot of different avenues and ideas that we wouldn't even have considered before,” Amit said.
