Demo

Full Stack Software Engineer

Alex AI
San Francisco, CA Full Time
POSTED ON 1/28/2026 CLOSED ON 2/26/2026

What are the responsibilities and job description for the Full Stack Software Engineer position at Alex AI?

Why Alex?

Alex is one of the fastest growing startups to come out of its YC batch with strong traction, . We’re generating revenue and well-funded by some of the best investors in the Valley with years of runway.

What are you up to?

Alex is building the future of hiring. Alex is an AI recruiter that conducts job interviews in real-time. Companies use Alex to get the best hiring signal on their applicant pool and hire in a fraction of the time. Our AI recruiter has a live conversation over a video/phone call with each of your candidates based on the interview questions you choose or that are recommended based on the job description. During the interview, our AI asks personalized follow-up questions in real-time based on the candidate's responses. Our AI recruiter can be customized to your roles in minutes and has already conducted thousands of interviews across engineering, IT, retail, hospitality, and more.

Who are you?

We’re people who:

  • genuinely enjoy solving complex engineering problems
  • learn quickly and do what it takes to deliver results
  • work really, really hard
  • move with urgency
  • enjoy and value working together in person in San Francisco 5 days a week

What technologies do you use?

Experience preferred in:

  • Javascript (Typescript, React, Node, Next)
  • Python
  • Cloud / DevOps (Azure, Kubernetes, Docker)
  • System Architecture

What can I work on?

Alex is similar to a marketplace, as we serve both candidates through the interview experience and employers through a data aggregation and analysis platform. As a hands-on engineer, you will build both consumer-facing and enterprise-grade software with a clear opportunity for growth. Problems that you could work on related to consumer software are:

  • How can we bring the average interviewer response latency down to 200ms?
  • How can we fine-tune our models to decrease hallucination and help Alex pass the Turing test?
  • How will our system architecture change as we scale to thousands more users, concurrently?

Problems that you could work on related to enterprise software are:

  • How do we integrate with our customer’s internal hiring systems?
  • What’s the best way to present interview results visually and as fast as possible?
  • How can Alex expand to coordinating the hiring process end to end?
  • And many, many feature requests that need to be built out!

What’s in it for me?

  • Take ownership of building the next billion dollar company
  • Collaborate with a tight-knit team of talented builders
  • Launch products that directly impact people’s careers
  • Work with the team daily in-person in SF
  • Competitive salary and equity
  • Health insurance, unlimited PTO, and great company events

If you’ve gotten this far and our culture/tech resonates with you, we want you to apply.

Salary.com Estimation for Full Stack Software Engineer in San Francisco, CA
$153,786 to $187,160
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