Actively matching engineers 📍 San Francisco & Bay Area

Senior React Engineer
Jobs in San Francisco.
Companies find you.

Skip the job hunt. Underdog.io is a closed, invite-only network connecting senior React engineers directly with SF's best startups. One profile. No applications. Hiring managers reach out to you.

Let SF companies find me → See how it works →
✓ Free for engineers, always ✓ Takes 5 minutes to join ✓ Your employer won't see this ✓ Salary info included upfront
Top 5%
of applicants accepted into the network
50%+
of companies turned away — quality only
85%
of engineers hear from a company in week one
300K+
candidates successfully matched

How it works

A job search that doesn't
feel like one.

You're not scrolling listings. You're not writing cover letters. Here's what actually happens when you join Underdog.

Step 01
Build your profile

Tell us who you are, what you've built, and what you're looking for next. Takes five minutes. No resume, no cover letter.

Step 02
Get hand-selected

We review every profile ourselves. Only the top 5% get accepted — which is exactly why SF hiring managers trust the candidates we send them.

Step 03
Interviews come to you

Every Monday we introduce you to matching companies. Hiring managers reach out directly — with salary ranges included — and you decide who gets your time.

Why engineers choose Underdog

Not another job board.

The difference isn't just how it feels — it's what actually happens to your profile after you submit it.

Typical job board or recruiter
✗Apply to a posting and compete with hundreds of other applicants
✗Your resume sits in an ATS no one's actively checking
✗Recruiters from agencies you've never heard of start calling
✗Comp expectations surface late — after you've invested time
✗Your current employer might see your profile
Underdog.io
✓One profile gets you introduced to multiple companies at once
✓Hiring managers read your profile directly — no ATS in the way
✓Only vetted startups — we reject 50%+ of companies that apply
✓Salary ranges are included with every interview request
✓Your profile is hidden from your current employer by default

Companies in the network

The startups that hire
through Underdog.

Every company has been reviewed and approved. No staffing firms. No agencies. Just real teams building real products.

Bland
Capital RX
Hippocratic AI
True Link Financial
Second Sight
Bizzy Car
Anatomy
Prismatic
Gemini
Cove
Onboard AI
J2 Health
Zest
GC AI
Pepr AI
Octogen Systems
Yogi
Teamshares
Eight Sleep
Roo
Keru.ai
MoneyLion
Kinetic Trials
Mira
Parachute Health

Not all companies hire for React roles at all times. We match you based on what's active when you join the network.

"

Every time I use Underdog.io I remember that job searching doesn't have to be terrible. Thanks for the product.

Zach B. — Senior Software Engineer

85%
Interview requests in week oneMost accepted engineers hear from companies within their first 7 days.
60s
To get startedNo resume upload. No cover letter. Just the basics — then we take it from there.
$0
Cost to engineersAlways free. Companies pay us. You just show up.

Good questions

Things engineers ask us
before joining.

Will my current employer see this? +
Is this a job board? Do I apply to roles? +
What does "top 5%" actually mean? +
How fast will I hear from companies? +
I'm not actively looking. Is this worth it? +
What kinds of companies are in the network? +

Ready when you are

Stop applying.
Start being chosen.

Join the network where San Francisco's best startups come to find senior React engineers. One profile. Five minutes. Your call on who gets your time.

Get in the network — it's free →
✓ Free for engineers ✓ 5 minutes to join ✓ Employer-safe by default ✓ No spam, ever