GRAI
Recommendation Systems · AI Agents
3open roles
1backers · u.ventures
Btruth index, 75 of 100
27technologies in use
Overview
GRAI is an AI music research company that builds an interactive music platform with personalised recommendations. Its vacancies include machine learning engineers for recommendation systems, research engineers, backend and infrastructure engineers and community and content roles. The company is headquartered in Warsaw, Poland.
How GRAI hires
Truth index
B 75/100
Ghost roles
0%
Stale roles
100%
Reposted roles
0%
GRAI 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
Funding and backers
Hiring now
5
open roles
Backers
1
u.ventures
Momentum
15/100
in the news
Last sign of life
1 mo ago
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Jun 2025
Website went live first capture in the Wayback Machine
Tractionpublic signals, read monthly
Web presence
top 10%
of 133.2M domains by links, Common Crawl
Backed byfrom the funds' portfolios and accelerator catalogs
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Jobs
≈ $68k – $134k per year (Estimated) · Equity · Hybrid · Full-Time · Warsaw
Reinforcement Learning
TensorFlow
PyTorch
Feature Store
Recommender Systems
Machine Learning
Analytics
A/B Testing
Apply
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≈ $68k – $112k per year (Estimated) · Hybrid · Full-Time · Warsaw
Python
SQL
Spark
TensorFlow
PyTorch
Feature Store
Recommender Systems
Machine Learning
Analytics
A/B Testing
Apply
Growth
Hiring Momentum
24/100
Hiring freeze
Open positions
5
0 opened / 1 closed in 30 days
Median time-to-fill
53 days
faster than 25% of the market
ATS activity
Every ~5 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.
Backend
33% ▼
Communications
33% ▼
Marketing
33% ▼
Tech stack
Technologies named in job postings at GRAI over the last 12 months, by layer, with the share of postings for each.
Technologies in use
27
Postings analysed
4
Stack modernity
78/100
Languages
Python
C++
Go
Java
Frameworks & libraries
PyTorch
TensorFlow
FFmpeg
Polars
Databases
DuckDB
Cloud & platforms
Spark
AWS
Amazon S3
Azure
Sign in to see how your skills match this stack
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Full GRAI tech stack
27 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
u.venturesVia a fund
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
The Deals: GRAI Acquires Social Music Platform Hangout; DICE Owner Fever Raises $250M
Also this week: Dan Loeb
Read more
Report
AI-music startup Grai acquires social-music service Hangout
In August we wrote about a startup called Grai becoming one of the first two companies -the other was Udio - to license a group of AI patents registered by UMG-backed Music IP Holdings.
Read more
Report
Khosla Ventures-backed AI music company GRAI acquires social music platform Hangout
Hangout launched in November 2024 with a catalog of over 100 million tracks, licensed from Sony Music Entertainment, Universal Music Group, Warner Music Group…
Read more
Report
AI music company GRAI acquires social listening platform Hangout
With the acquisition now closed, GRAI says it is committed to continuing and expanding the partnerships Hangout built with labels, publishers and collecting societies…
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Report
AI Music Companies Udio and GRAI License Swath of Patents From UMG-Backed Music IP Holdings (EXCLUSIVE)
Music IP Holdings has licensed a portfolio of more than 24 patents to the AI music platforms Udio and GRAI.
Read more
Report
Jeremy's Only Rule of Testing
Test with the finest grained scenario that tells you something important Years ago I wrote a series of blog posts describing "Jeremy's Laws of Test Driven Development" (1, 2, 3, a…
Read more
Report
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
Warsaw
Warsaw
Poland
HQ
3 open roles 1 posted in 90 days 100% engineering
hires for AI/ML