Whitecircle
AI Safety & Alignment
9open roles
Growinghiring pace, 60 of 100
Atruth index, 93 of 100
107 daysmedian time a role stays open
Overview
White Circle is an AI safety company developing best-in-class AI stress-testing and AI moderation tools.
How Whitecircle hires
Truth index
A 93/100
Median time to fill
107 days
Ghost roles
0%
Stale roles
8%
Reposted roles
0%
Whitecircle scores A on the Alion truth index (A is best, E worst), measured over 13 open roles re-checked against its own hiring board: 0% look like ghost listings, 8% have gone stale and 0% are the same role posted again. Its roles close in a median of 107 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
Jobs
≈ $133k – $268k per year (Estimated) · In office · Full-Time · 6+ years exp · New York
JavaScript
TypeScript
Cursor
Claude Code
OpenAI
Anthropic
Hugging Face
Frontend
Tailwind CSS
Next.js
D3.js
React.js
Vite
Radix UI
Storybook
shadcn/ui
Framer Motion
Recharts
visx
DevOps
Datadog
Git
Design
Figma
Apply
≈ $102k – $195k per year (Estimated) · Equity · Remote (United States) · Full-Time · 5+ years exp
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Apply
≈ $128k – $270k per year (Estimated) · Remote (United States, US time zones hours) · Full-Time
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
GitHub
Apply
≈ $102k – $195k per year (Estimated) · Equity · Remote (United States) · Full-Time · 5+ years exp
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Apply
≈ $58k – $124k per year (Estimated) · Hybrid · Full-Time · Paris · London
Qwen
DeepSpeed
RLHF
Quantization
Multimodal AI
Knowledge Distillation
AI Agents
PyTorch
Whisper
Mixture of Experts
Synthetic Data
LLaVA
OpenAI
Anthropic
Hugging Face
DPO
SFT
GRPO
FSDP
Model Distillation
Reward Modeling
DevOps
Datadog
QA
Sentry
Apply
≈ $55k – $118k per year (Estimated) · Hybrid · Full-Time · Paris · London
Python
SQL
Embeddings
RLHF
NLP
OpenAI
Anthropic
Hugging Face
DPO
SFT
GRPO
Human-in-the-Loop
Semantic Search
Reward Modeling
DevOps
Datadog
GitHub
QA
Sentry
Apply
≈ $55k – $94k per year (Estimated) · Hybrid · Full-Time · Master's Degree · Paris · London
AI Agents
Mistral
LLM
OpenAI
Anthropic
Hugging Face
Post-training
LLM Guardrails
Machine Learning
DevOps
Datadog
QA
Sentry
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≈ $57k – $123k per year (Estimated) · Hybrid · Full-Time · Paris · London
Python
Multimodal AI
Mistral
LLM
Synthetic Data
OpenAI
Anthropic
Hugging Face
Post-training
LLM Guardrails
DevOps
Datadog
QA
Sentry
Apply
≈ $109k – $209k per year (Estimated) · Remote (United States) · Full-Time · 5+ years exp
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Design
Figma
Apply
Growth
Hiring Momentum
60/100
Growing
Open positions
14
1 opened / 5 closed in 30 days
Median time-to-fill
97 days
faster than 12% of the market
ATS activity
Every ~4 hours
Today
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.
Design
22% ▲
HR
22% ▼
Frontend
11% ▲
Product
11% ▲
Finance
11% ▼
Sales
11% ▼
Activity Timeline
Added OWASP to stack
Sep 2026
Added Unix to stack
Sep 2026
Added TCP/IP to stack
Sep 2026
Added Linux to stack
Sep 2026
Added Machine Learning to stack
Sep 2026
New location: Los Angeles
Sep 2026
Tech stack
Technologies named in job postings at Whitecircle over the last 12 months, by layer, with the share of postings for each.
Technologies in use
102
Postings analysed
24
Stack modernity
83/100AI adopter
Languages
Python33%
Rust8%
SQL8%
C++4%
Frameworks & libraries
Playwright8%
PyTorch8%
Pytest8%
Axum4%
Databases
ClickHouse4%
PostgreSQL4%
Redis4%
Cloud & platforms
Anthropic100%
Datadog100%
Hugging Face100%
OpenAI100%
AI & ML
LLM29%
Mistral29%
Qwen8%
Grok4%
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Full Whitecircle tech stack
102 technologies · by team · pay by technology · changes · similar stacks
Connections
List
Graph
Found in company registers, site code, DNS and hiring. Each connection shows how sure we are and the evidence, with its source and date.
Shared investors
Hummingbird VenturesVia a fund
Octopus VenturesVia a fund
Abstract VenturesVia a fund
Y CombinatorVia a fund
6311 portfolio companies
Click a company to open it. Dashed lines are likely connections. The second step of the network is part of the Pro plan.
Owner
Same company
Same group
Likely
News
White Circle (@whitecircle) on X
Introducing Halo, the best framework for post-training of open-source models.Halo delivers up to 2.8x the throughput of stock TRL with less peak memory, while models stay in their native HuggingFace format.Star us on GitHub: https://t.co/3mAiUljdrN
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Report
KillBench: Discovering Hidden Biases of LLMs
1.3M+ experiments exposing bias in critical AI decision-making
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Report
White Circle (@whitecircle) on X
Introducing KillBench - a benchmark of hidden LLM biases in critical decisions. We ran millions of life-and-death scenarios across every major LLM, varying nationality, religion, gender, and more. Every AI model is biased.Here's what we found
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Report
White Circle (@whitecircle) on X
We built an MCP so your model can call an AI psychotherapist when it's feeling downlink in comments
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Report
CircleGuardBench - a Hugging Face Space by whitecircle
Explore the GuardBench leaderboard to see how different AI models perform on safety tests. Use the search box, model-type filters, and column selector to customize the displayed table, and view rad...
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Report
Offices
Where the company hires and what each office is for
Cities
4
Hiring now
3
Countries
3
Busiest office
London
Loading the map
Headquarters
Builds here
Office with open vacancies
No open vacancies right now Tap a pin for the office
San Francisco
United States
HQ
London
United Kingdom
Sales office
6 open roles 2 posted in 90 days 67% engineering 17% remote 50-200 est. staff
hires for AI/ML, Data Science, HR
Paris
France
Engineering / R&D
4 open roles 100% engineering 50-200 est. staff
hires for AI/ML, Data Science
New York
United States
1 open roles 1 posted in 90 days 100% engineering 10-50 est. staff
hires for Frontend