Antithesis
antithesis.com
Actively hiring
Software Testing & QA
As featured in
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Overview
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Total raised
$152M
4 rounds on record
Latest round
$105M
Series A · Dec 2025 · 10 mo ago
Team
201-500
employees, estimated range
Hiring now
20
+3 posted in 30 days
Grants
$1.2M
2 grants · CORDIS
Backers
2
Amplifypartners, Frontline
The money's age
Fresh money
10 months since the last round · and hiring
Momentum
66/100
hiring for its size, a new city, in the news, fresh money, rising traction
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Apr 17
On the Hacker News front page What are skiplists good for? · 290 points
Dec 3, 2025
Raised a round Series A $105M · led by Jane Street · TechNews180
Sep 10, 2024
On the Hacker News front page Debugging in the Multiverse · 201 points
Mar 20, 2024
On the Hacker News front page So you think you want to write a deterministic hypervisor? · 200 points
Feb 13, 2024
Raised a round Seed $47M
Mar 1, 2022
Won a grant $999k · CORDIS
Oct 15, 2019
Won a grant $225k · CORDIS
2018
Founded
Tractionpublic signals, read monthly
Web presence
top 0.33%
of 133.2M domains by links, Common Crawl
Hacker News stories
77
best: 1179 points
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Series A | Dec 2025 | $105M | Jane Street lead | TechNews180 |
| Seed | Feb 2024 | $47M | — | reuters.com |
| Grant | Mar 2022 | $999k | — | CORDIS |
| Grant | Oct 2019 | $225k | — | CORDIS |
Backed byfrom the funds' portfolios and accelerator catalogs
Amplifypartners 
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Deterministic simulation and formal verification for distributed systems.
How Antithesis hires
Truth index
A 95/100
Median time to fill
98 days
Ghost roles
0%
Stale roles
0%
Reposted roles
0%
Antithesis scores A on the Alion truth index (A is best, E worst), measured over 8 open roles re-checked against its own hiring board: 0% look like ghost listings, 0% have gone stale and 0% are the same role posted again. Its roles close in a median of 98 days. It measures how much of what this employer publishes turns into a real, finite search - not the employer as a workplace. How the index is computed
Visa sponsorship
- United States · H-1B filings in 12 months: 2
- United Kingdom · Licensed UK visa sponsor (Skilled Worker, Senior or Specialist Worker)
Overview
Antithesis is an autonomous software testing company headquartered in Tysons, Virginia, and founded in 2018 by the team behind FoundationDB. The company runs software inside a deterministic hypervisor that explores program states, finds rare bugs, and replays any failure exactly as it occurred. It sells to teams building databases, distributed systems, and other infrastructure where nondeterministic bugs are hard to reproduce with conventional test suites.
News
Bleach: 5 Strongest Abilities That Can Rival The Antithesis, Ranked
When it comes to the Bleach, Uryu's Antithesis is one of the most broken hax abilities. But here are a few more that rivals his Schrift perfectly.
Read more
Report
Introduction to Property-Based Testing
Led by Alperen Keles and designed in collaboration with Carnegie Mellon University
Read more
Report
Report
Report
Report
Finding bugs in Raft implementations
Why formal verification is not enough to maintain consensus in real systems
Read more
Report
Quality non-fiction books are the antithesis of AI slop
...so I vibe-coded a tool for finding more of them
Read more
Report
How Antithesis Turned exe into a Sandbox for Agentic Software Tests - exe.dev blog
"There's this tension between giving agents enough power and then also not letting them destroy the world."
Read more
Report
Report
A distributed systems reliability glossary Antithesis Docs
A list of key concepts for building and testing reliable distributed systems, with basic definitions and deep references.
Read more
Report
Show more news
Tech stack
Technologies named in job postings at Antithesis over the last 12 months, by layer, with the share of postings for each.
Technologies in use
31
Postings analysed
18
Stack modernity
81/100AI adopter
Languages
Rust44%
JavaScript33%
C++33%
Python28%
Frameworks & libraries
Cypress6%
LangChain6%
Playwright6%
Selenium6%
Cloud & platforms
Kubernetes28%
Linux17%
AWS11%
GitHub11%
AI & ML
LLM6%
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Full Antithesis tech stack
31 technologies · by team · pay by technology · changes · similar stacks
Salary insights
Compensation ranges based on this company's open jobs
Median
$200k
Typical range
$85k – $325k
Open positions
17
14
Jobs
Junior
14.3%
Middle
7.1%
Senior
64.3%
Staff
14.3%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Junior | 2 | $95k | $85k – $106k |
| Middle | 1 | $185k | $185k |
| Senior | 9 | $220k | $115k – $325k |
| Staff | 2 | $237k | $225k – $250k |
Highest paying role
Senior Account Executive - Chicago
$325k
Normalized to USD per year
All salaries at Antithesis
By role, level and city, against the market · 17 jobs with pay
Growth
Hiring Momentum
67/100
Growing
Open positions
20
2 opened / 8 closed in 30 days
Median time-to-fill
98 days
faster than 14% of the market
ATS activity
Every ~4 hours
10/16/2026
Hiring Dynamics
+100%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Sales
21% ▼
Solutions
21% ▼
Finance
16% ▲
Backend
11%
Legal
11%
Marketing
11%
Activity Timeline
New location: Seattle
Oct 2026
Added Microsoft Office to stack
Sep 2026
Added Linux to stack
Sep 2026
Added Scrum to stack
Sep 2026
Added Agile to stack
Sep 2026
New location: Vienna
Sep 2026
New location: Atlanta
Sep 2026
New location: Chicago
Sep 2026
New location: New York
Sep 2026
Added Selenium to stack
Sep 2026
Added Playwright to stack
Sep 2026
Added Cypress to stack
Sep 2026
Offices
Where the company hires and what each office is for
Cities
5
Hiring now
4
Countries
2
Busiest office
Vienna
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Headquarters
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Tysons
United States
HQ
Vienna
United States
Antithesis HQ
11 open roles 10 posted in 90 days 36% engineering 50-200 est. staff $176k Avg Salary
hires for Backend, Finance, AI/ML
8607 Westwood Center Dr Suite 550, Vienna, VA 22182
London
United Kingdom
Sales office
London office
5 open roles 3 posted in 90 days 50-200 est. staff $156k Avg Salary
hires for Sales, Marketing, Industrial Engineering
60 Gainsford Street London SE1 2NY, UK
San Francisco
United States
Support & operations
San Francisco office
2 open roles 1 posted in 90 days 10-50 est. staff $270k Avg Salary
hires for Sales, Solutions
71 Stevenson St Suite 1050, San Francisco, CA 94105
Seattle
United States
1 open roles 1 posted in 90 days 10-50 est. staff $320k Avg Salary
hires for Sales
Earlier presence
Singapore, Singapore
Jobs
$160k – $220k per year • In office • Full-Time • Vienna
JavaScript
Rust
TypeScript
Apply
$155k – $185k per year • In office • Full-Time • 4+ years exp • Vienna
TypeScript
LangChain
LLM
DevOps
AWS
Management
Slack
Apply
≈ $102k – $233k per year (Estimated) • In office • Full-Time • London
Python
JavaScript
SQL
Docker
Kubernetes
Apply
≈ $167k – $305k per year (Estimated) • In office • Full-Time • 5+ years exp • Vienna
Rust
C++
Apply
$175k – $220k per year • In office • Full-Time • 7+ years exp • San Francisco
Python
JavaScript
SQL
Docker
Kubernetes
Linux
Apply
$120k – $200k per year • In office • Full-Time • Vienna
Rust
TypeScript
C++
Apply
$185k – $250k per year • In office • Full-Time • Vienna
Python
Go
Java
Rust
TypeScript
C++
Terraform
NixOS
Apply