Mason
Hiring
What they do:
Mason is the fastest way to take smart devices from idea to end user
Quick facts:
HQ: Seattle, WA, United States
Top B2B Software Startups in Seattle
This list has 61 startups and was last updated on Oct 15, 2026. 11 of them are hiring right now. Largest teams: Heap, Mason, and Aurelian. Latest round: LevelTen Energy raised $2M (Oct 8, 2026).
61 startupsPage 1 of 2
Aurelian
Hiring
What they do:
Automating non-emergency calls for 911 centers
Quick facts:
HQ: Seattle, WA, United States
What they do:
AI Scribe for veterinarians. Saving time and improving patient care.
Quick facts:
HQ: Seattle, WA, United States
What they do:
We empower the world’s hiring teams to grow engaged, high-performing…
Quick facts:
HQ: Seattle, WA, United States
Clearly AI
Hiring
What they do:
Automate security and privacy reviews
Quick facts:
HQ: Seattle, WA, United States
What they do:
Investment management platform for real estate
Quick facts:
HQ: Seattle, WA, United States
Starcloud
Hiring
What they do:
Data centers in space
Quick facts:
HQ: Seattle, WA, United States
What they do:
Take Back Control of your Time
Quick facts:
HQ: Seattle, WA, United States
What they do:
Code-first scrapers and RPAs — built and maintained by AI
Quick facts:
HQ: Seattle, WA, United States
Boundary
Hiring
What they do:
The programming language for AI
Quick facts:
HQ: Seattle, WA, United States
aSim
Hiring
What they do:
Build and share apps with friends
Quick facts:
HQ: Seattle, WA, United States
Strac
Hiring
What they do:
Data Discovery, DLP, DSPM for SaaS, Cloud, Gen AI & Endpoints
Quick facts:
HQ: Seattle, WA, United States
Feather
Hiring
What they do:
Voice AI
Quick facts:
HQ: Seattle, WA, United States
What they do:
Changing divorce for good by making it a way less horrible experience…
Quick facts:
HQ: Seattle, WA, United States
What they do:
We make beautiful connected light switches that allow you to control…
Quick facts:
HQ: Seattle, WA, United States
What they do:
Dollar Shave Club as a platform.
Quick facts:
HQ: Seattle, WA, United States
Moonset Health
Hiring
What they do:
AI for Post-Acute Senior Care (Hospice, Home Health, Skilled Nursing…
Quick facts:
HQ: Seattle, WA, United States
Terrakotta
Hiring
What they do:
AI platform for phone-first sellers
Quick facts:
HQ: Seattle, WA, United States
Hubble
Hiring
What they do:
AI-native retrieval engine for medical records
Quick facts:
HQ: Seattle, WA, United States
What they do:
Aggregating Spot Freight Opportunities for Carriers
Quick facts:
HQ: Seattle, WA, United States
What they do:
Help business find and discover AI solutions
Quick facts:
HQ: Seattle, WA, United States
What they do:
The AIOps Agent for ML Teams
Quick facts:
HQ: Seattle, WA, United States
What they do:
AI operating system for mega-scale satellite networks.
Quick facts:
HQ: Seattle, WA, United States
What they do:
Event extraction for Medical Researchers
Quick facts:
HQ: Seattle, WA, United States
What they do:
Cloud Native SIEM (alternative to Splunk/Elastic)
Quick facts:
HQ: Seattle, WA, United States
What they do:
Building your AI coworkers for any team, workflow, or industry.
Quick facts:
HQ: Seattle, WA, United States
What they do:
Helping software developers find teams that share their values.
Quick facts:
HQ: Seattle, WA, United States
What they do:
AI for public records request fulfillment
Quick facts:
HQ: Seattle, WA, United States
What they do:
Analytics to improve how teams work and collaborate
Quick facts:
HQ: Seattle, WA, United States
YC W18Early stage
What they do:
24/7 emergency maintenance department for property managers and…
Quick facts:
HQ: Seattle, WA, United States
Heap
Acquired
What they do:
Captures user interactions with no code to generate analytics.
Quick facts:
HQ: Seattle, WA, United States
Quick facts:
HQ: Seattle, WA, United States
Incorporated: 2022
Funding:
$80M · Equity · Feb 2026
Quick facts:
HQ: Seattle, WA, United States
Incorporated: 2023
Funding:
$65M · Equity · Jun 2026
Quick facts:
HQ: Seattle, WA, United States
Incorporated: 2024
Funding:
$46.7M · Equity · Mar 2026
Quick facts:
HQ: Seattle, WA, United States
Incorporated: 2025
Funding:
$36.3M · Equity · Jun 2026
Quick facts:
HQ: Seattle, WA, United States
Incorporated: 2025
Funding:
$24.8M · Equity · Jun 2026
Questions and answers
How many startups are on this list?
There are 61 startups on this list, last updated on Oct 15, 2026.
Which of them are hiring?
11 of them are hiring right now, including Mason, Aurelian, and Clearly AI.
Which of them have the largest teams?
By team size: Heap (388 employees), Mason (65 employees), and Aurelian (45 employees).
Which of them raised money recently?
Latest rounds: LevelTen Energy — $2M Equity (Oct 2026), CytoTerra — $300K Options (Oct 2026), and Reclaim — $3.15M Equity (Jun 2026).