TrainLoop
LLM & Generative AI · Reinforcement Learning
3open roles
1backers · Y Combinator
10+team · employees, estimated range
2024founded
Overview
Headquartered in San Francisco, California, TrainLoop is an artificial intelligence research and product lab specializing in post-training reasoning models for long-horizon tasks. Founded in 2024, the enterprise develops advanced reinforcement learning and fine-tuning solutions to transform general foundation models into domain-specific experts for industries such as biotechnology, logistics, and financial services. By embedding human expert intuition and rigorous preference alignment into proprietary architectures, the company enables organizations to deploy highly reliable AI agents for complex, mission-critical workflows.
Funding and backers
Team
11-50
employees, estimated range
Hiring now
4
+4 posted in 30 days
Backers
1
Y Combinator
Momentum
40/100
hiring for its size
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
Tractionpublic signals, read monthly
Web presence
top 7%
of 133.2M domains by links, Common Crawl
Backed byfrom the funds' portfolios and accelerator catalogs
Investors in similar startupsfunds that back the companies most like this one
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Jobs
$150k – $250k per year · Equity 0.5–1.5% · In office · Full-Time · 3+ years exp · San Francisco
Apply
$150k – $250k per year · Equity 0.5–1.5% · In office · Full-Time · 3+ years exp · San Francisco
JAX
PyTorch
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$150k – $250k per year · Equity 0.5–1.5% · In office · Full-Time · 3+ years exp · PhD · San Francisco
Reinforcement Learning
Post-training
Interpretability
Apply
Salary insights
Compensation ranges based on this company's open jobs
Median
$250k
Typical range
$250k
Open positions
4
4
Jobs
Middle
75%
Architect
25%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Middle | 3 | $250k | $250k |
| Architect | 1 | $250k | $250k |
Highest paying role
Head of Enterprise
$250k
Normalized to USD per year
Growth
Hiring Momentum
28/100
Slowing
Open positions
4
0 opened / 0 closed in 30 days
ATS activity
Every ~5 hours
Today
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
50% ▲
Design
25% ▲
Sales
25% ▲
Tech stack
Technologies named in job postings at TrainLoop over the last 12 months, by layer, with the share of postings for each.
Technologies in use
5
Postings analysed
2
Stack modernity
68/100
Frameworks & libraries
JAX
PyTorch
Practices & domains
Interpretability
Post-training
Reinforcement Learning
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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
Y CombinatorVia a fund
6310 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
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
San Francisco
San Francisco
United States
HQ
4 open roles 4 posted in 90 days 50% engineering 10-50 est. staff $250k Avg Salary
hires for AI/ML, Design, Sales