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21st
Infrastructure and UI building blocks for the agentic internet
Last verified August 17, 2026 · Updated daily
Open roles at 21st
Nothing live right now. We re-check 21st daily and this page updates the moment they post.
Want their roles the day they go up, before the job boards index them?
Get started →Know when 21st is hiring before anyone else
A role stays uncontested for about four days. Here's the window — and where we put you in it.
From $9/month, cancel any time.
Watching 21st
0 applicantsRole spotted & verified
1You get the alert
1You've applied
~8Hits the job boards
250+Working at 21st
Since , 21st has built Infrastructure and UI building blocks for the agentic internet. The team is now <50 people. Working at a B2B, Engineering, Product and Design company at this stage means broad remit, direct access to founders, and equity that still means something if the company works out.
Most openings are based out of San Francisco, CA, USA.
How to actually get hired at 21st
Why applying the normal way doesn't work
21st is <50 people. No recruiter, no HR. Your application goes to a founder juggling everything. Cold outreach is how you actually get seen.
Who to contact at 21st
Contact route not yet verified for 21st. For a <50-person B2B, Engineering, Product and Design company, expect a founder or department head to make the call — but this is a model, not confirmed data.
What 21st screens for
relevant experience and ability to operate autonomously
Customize your CV for the 21st role. Matching the job description language helps clear ATS filters.
Mistakes that kill 21st applications
Generic CVs stand out at a <50-person company — and not in a good way. Fastest path to rejection.
Don't open with what you want. Open with what 21st is dealing with right now — is growing, and what you'd do about it.
The wait-and-hope strategy fails. Follow up on day five — response rates roughly double.
Applying to 21st? Get the contact, not the form.
The 21st interview process
3 stages · 7 days typical · take-home: no · modelled from similar companies
We don't yet have verified candidate reports for 21st. What follows is the typical process for a <50-person B2B, Engineering, Product and Design company — treat it as a model, not confirmed detail.
Interview stages
Intro Call
Video call · 30 min
Culture fit and role expectations
Founder or hiring manager
Technical Deep Dive
Video call or in-person · 60 min
Past projects and problem-solving approach
Technical founder or lead
Final Round
In-person or video · 45 min
Team fit and offer discussion
Founding team
21st interview timeline
Timeline: ~ days. That's faster than the B2B, Engineering, Product and Design median (10 days at <50 people).
Interviewed at 21st?
Tell us how it went — stages, questions, timeline. Takes 90 seconds and it's how this page stays accurate for the next person.
Submit your 21st interview experience →21st jobs, frequently asked questions
Is 21st hiring right now?
We aren't tracking any live 21st vacancies today. We re-check daily and this page updates as soon as a role appears.
How do I apply for a job at 21st?
Apply via the links above. For tips, read our guide on how to get hired at 21st.
Does 21st respond to cold emails?
Response rate data for 21st not yet confirmed.
Who is the hiring manager at 21st?
At this size, hiring is usually run by a founder or department head.
How competitive is it to get hired at 21st?
Typical applicant count for B2B, Engineering, Product and Design roles (<50 people): 50-100 in two weeks. Apply fast.
How many rounds is the 21st interview?
3 stages: Intro Call, Technical Deep Dive, Final Round.
Is the 21st interview hard?
Focus on relevant experience and culture fit, not puzzles. Final Round is reportedly the most challenging round.
Does 21st give a take-home task?
No, 21st does not include a take-home stage.
How long does 21st take to get back to you?
Around 7 days across the full process.
What should I prepare for the 21st interview?
Focus on relevant experience and culture fit. At <50 people, they're testing whether you can operate without process, not whether you memorised algorithms.
Where is 21st based?
21st is headquartered in San Francisco, CA, USA.
Get 21st roles before they're posted
A role stays uncontested for about four days. Here's the window — and where we put you in it.
From $9/month, cancel any time.
Watching 21st
0 applicantsRole spotted & verified
1You get the alert
1You've applied
~8Hits the job boards
250+