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Character.AI is an American company founded in 2021 by former Google researchers that operates a platform for creating and talking to personality-driven AI characters. Users build characters with a description, greeting and example dialogue, then share them publicly, and the service has grown into one of the most used consumer AI products by session time. Headquartered in Redwood City, California, the company runs its own dialogue-tuned models and has added voice calls, animated avatars and multi-character scenes, alongside age assurance and safety controls for younger users.
character.ai • Menlo Park • Redwood City • New York • 51-200 employees • Founded 2021 • Series A $150M
Internet Services
Media & Entertainment
Conversational AI
LLM & Generative AI
SQL
Gemini
Docker
Fine-tuning
Kubernetes
LLM
Prompt Engineering
Python
+45 More
Latest jobs Technical Program Manager, Product Experience Principal Research Engineer, Post-Training
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12 open jobs
$260k – $400k Salary
51-200 Team size
2021 Founded
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Meta Platforms is an American technology company founded in 2004 as Facebook and renamed in 2021 to signal its investment in immersive computing. It operates the largest family of social and messaging applications in the world, comprising Facebook, Instagram, WhatsApp, Messenger and Threads, and earns almost all of its revenue from advertising sold against that audience. Headquartered in Menlo Park, California, the company also develops the open Llama language models and the Reality Labs division behind Quest headsets and Ray-Ban smart glasses.
meta.com • Menlo Park • Redmond • Bengaluru • 5000+ employees • Founded 2004 • IPO $16B
LLM & Generative AI
Artificial Intelligence
Online Communication
Advertising
C++
Sensor Fusion
CUDA Toolkit
LLM
PyTorch
TensorFlow
Django
Go
+11 More
Latest jobs SDE - III Research Scientist, AI Networking (PhD)
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2 open jobs
$181k Salary
5000+ Team size
2004 Founded
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Reddit is an American social platform founded in 2005 and organised into hundreds of thousands of user-created communities known as subreddits. Members post links, text, images and video, and the community ranks each submission through upvotes and downvotes, which decides what surfaces on the front page and inside each community. Headquartered in San Francisco and listed on the New York Stock Exchange since 2024, the company earns most of its revenue from advertising and has added data licensing deals that let AI developers train on its public conversation archive.
reddit.com • San Francisco • New York • Chicago • Los Angeles • Toronto • 1001-5000 employees • Founded 2005 • IPO $748M
Online Communication
Advertising
Media & Entertainment
Online Forums & Communities
Go
Python
Ruby
Rust
Apache Kafka
Google BigQuery
Kubernetes
pySpark
+148 More
Latest jobs Staff Product Manager, Ads Formats Staff Site Reliability Engineer, Ads
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117 open jobs
$267k – $355k Salary
1001-5000 Team size
2005 Founded
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Perplexity AI is an American company that builds an answer engine combining live web search with large language models to return sourced, conversational responses instead of a list of links. Its products span a consumer assistant on web and mobile, the Comet browser, enterprise search over internal documents and the Sonar developer API that exposes the same grounded retrieval stack. Founded in 2022 in San Francisco by former researchers and engineers from OpenAI, Meta and Databricks, the company is backed by NVIDIA, IVP, New Enterprise Associates and SoftBank.
perplexity.ai • San Francisco • Los Angeles • Belgrade • London • New York • 1001-5000 employees • Founded 2022 • Series D $500M
AI Agents
Internet Services
Artificial Intelligence
Search Engines
Python
Rust
TypeScript
AI Agents
Go
Playwright
AWS
C++
+132 More
Latest jobs Director, Litigation Engineering Manager (API Platform)
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53 open jobs
$210k – $485k Salary
1001-5000 Team size
2022 Founded
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Alion is a developer discovery platform that connects technology employers with software, data and AI professionals across global and remote markets. The service indexes publicly available engineering artifacts to build talent profiles, structured company pages and a continuously refreshed job board that normalises vacancies from company career sites and applicant tracking systems. Alongside search it provides recruiter tooling such as candidate screening, tailored CV generation and market analytics on salaries, skills and hiring activity, delivered from a single privacy-conscious workspace.
alion.io • Dubai • 1-10 employees • Founded 2025
Internet Services
Artificial Intelligence
Human Resources
Anthropic
OpenAI
Semantic Search
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