Whitecircle
whitecircle.com
Actively hiring
Artificial Intelligence
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Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
How Whitecircle hires
Truth index
B 75/100
Ghost roles
0%
Stale roles
100%
Reposted roles
0%
Whitecircle scores B on the Alion truth index (A is best, E worst), measured over 3 open roles re-checked against its own hiring board: 0% look like ghost listings, 100% have gone stale and 0% are the same role posted again. 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
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
Technologies
Tech DNA
Python
Rust
SQL
PyTorch
Playwright
Pytest
ClickHouse
PostgreSQL
Redis
Amazon EKS
Amazon S3
AWS
LLM
Mistral
Qwen
AI/ML
Python
SQL
C++
Anthropic
Hugging Face
OpenAI
Datadog
AI Agents
LLM
Mistral
Multimodal AI
Post-training
Fine-tuning
RAG
Claude Code
PyTorch
Qwen
DPO
GRPO
Reward Modeling
RLHF
SFT
Synthetic Data
LLM Guardrails
Machine Learning
GitHub
ElevenLabs
Browser Agents
Function Calling
LangChain
LangGraph
LlamaIndex
Red Teaming
Tool Use
CUDA
CUDA Toolkit
Grok
InfiniBand
JAX
Multi-Agent Systems
NCCL
OpenAI Codex
Ray
SGLang
TensorRT-LLM
vLLM
TensorRT
DeepSpeed
FSDP
Knowledge Distillation
LLaVA
Mixture of Experts
Model Distillation
Quantization
Whisper
Embeddings
Human-in-the-Loop
NLP
Semantic Search
Semantic Search
CI/CD
Kubernetes
SLURM
GitHub Actions
GitLab CI
PyTorch C++
ClickHouse
PostgreSQL
Redis
Amazon EKS
Amazon S3
AWS
Docker
IAM
Terraform
Linux
TCP/IP
Unix
QA
Go
Sentry
Playwright
Postman
Pytest
Insomnia
k6
Locust
Other
Rust
Burp Suite
SOC 2
OWASP
Axum
Apache Kafka
Figma
n8n
Stack modernity
82/100
How modern this stack is, based on technology relevance, AI adoption and the share of legacy tools.
In-demand technologies
Datadog
19 jobs
Required
OpenAI
19 jobs
Required
Anthropic
19 jobs
Required
Hugging Face
19 jobs
Required
AI Agents
12 jobs
Required
Mistral
7 jobs
Optional
LLM
7 jobs
Required
Python
7 jobs
Required
Salary medians are calculated from this company's open jobs and compared with the market.
Industry adoption
Python
20%
AWS
16%
SQL
15%
CI/CD
15%
AI Agents
14%
Kubernetes
12%
Share of companies in the same industry that use each technology.
Stack changes
OWASP
Sep 2026
Unix
Sep 2026
TCP/IP
Sep 2026
Linux
Sep 2026
Machine Learning
Sep 2026
Figma
Sep 2026
SOC 2
Sep 2026
Locust
Sep 2026
Technologies recently added to or removed from this company's stack - a signal of tech migrations and new initiatives.
Jobgether
NVIDIA
Weekday
Adobe
Cisco Systems
JPMorganChase
Growth
Hiring Momentum
41/100
Stable
Open positions
19
1 opened / 1 closed in 30 days
Median time-to-fill
74 days
faster than 22% of the market
ATS activity
Every ~3 hours
Today
Hiring Dynamics
0%
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.
AI/ML
31% ▼
HR
13% ▲
Sales
13% ▲
Data Science
6% ▼
Backend
6% ▼
DevOps
6% ▼
Activity Timeline
New location: Los Angeles
Sep 2026
Offices
Where the company hires and what each office is for
Cities
3
Hiring now
3
Countries
3
Busiest office
London
Loading the map
Headquarters
Builds here
Office with open vacancies
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London
United Kingdom
Engineering / R&D
8 open roles 7 posted in 90 days 88% engineering 25% remote 50-200 est. staff
hires for AI/ML, Data Science, Backend
Paris
France
Engineering / R&D
7 open roles 6 posted in 90 days 86% engineering 50-200 est. staff
hires for AI/ML, Data Science, QA
New York
United States
Sales office
1 open roles 1 posted in 90 days 10-50 est. staff
hires for Marketing
Jobs
≈ $107k – $247k per year (Estimated) • Equity • Remote • Full-Time
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Apply
≈ $131k – $282k per year (Estimated) • Remote • Full-Time
Python
LangGraph
LangChain
LlamaIndex
Function Calling
AI Agents
Mistral
LLM
RAG
OpenAI
Anthropic
Hugging Face
Red Teaming
Browser Agents
Tool Use
DevOps
Datadog
Cybersecurity
Burp Suite
OWASP
QA
Playwright
Postman
Pytest
Sentry
Apply
≈ $68k – $156k per year (Estimated) • Remote/Hybrid • Full-Time • Paris • London
Python
Rust
C++
PyTorch C++
AI/ML
Grok
Qwen
Claude Code
vLLM
CUDA Toolkit
Fine-tuning
JAX
AI Agents
SGLang
TensorRT
TensorRT-LLM
Mistral
PyTorch
LLM
Ray
CUDA
OpenAI
Anthropic
Hugging Face
OpenAI Codex
Post-training
NCCL
InfiniBand
Multi-Agent Systems
DevOps
Datadog
SLURM
Kubernetes
Apply
≈ $71k – $164k per year (Estimated) • Remote/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
≈ $67k – $155k per year (Estimated) • Remote/Hybrid • Full-Time • Paris • London
Python
SQL
Embeddings
RLHF
NLP
Semantic Search
OpenAI
Anthropic
Hugging Face
DPO
SFT
GRPO
Human-in-the-Loop
Semantic Search
Reward Modeling
DevOps
Datadog
GitHub
QA
Sentry
Apply
≈ $56k – $128k per year (Estimated) • Equity • Remote • Full-Time • 2+ years exp • London
Python
SQL
Claude Code
AI Agents
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Management
n8n
Apply
≈ $58k – $113k per year (Estimated) • Remote/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
Apply
≈ $71k – $163k per year (Estimated) • Remote/Hybrid • Full-Time • Paris • London
Python
Multimodal AI
AI Agents
Mistral
LLM
Synthetic Data
OpenAI
Anthropic
Hugging Face
Post-training
LLM Guardrails
DevOps
Datadog
QA
Sentry
Apply
≈ $62k – $149k per year (Estimated) • Remote/Hybrid • Full-Time • Paris
Python
Go
Rust
Axum
Databases
PostgreSQL
Redis
ClickHouse
Apache Kafka
AI/ML
AI Agents
Mistral
LLM
RAG
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
QA
Sentry
Apply
Remote/Hybrid • Full-Time • 2+ years exp • Paris • London
Python
AI Agents
Mistral
LLM
OpenAI
Anthropic
Hugging Face
DevOps
GitHub Actions
Datadog
GitLab CI
CI/CD
Cybersecurity
SOC 2
QA
Playwright
Postman
Insomnia
Pytest
Sentry
k6
Locust
Apply
≈ $85k – $162k per year (Estimated) • Equity • Remote • Full-Time • 3+ years exp
OpenAI
Anthropic
Hugging Face
DevOps
Datadog
Design
Figma
Apply