Trajectory
AI Development Tools
6open roles
$15Mlatest round · Venture round · May 2026 · 5 mo ago
5backers · Bessemer Venture Partners, BoxGroup
Growinghiring pace, 64 of 100
Overview
Headquartered in San Francisco, California, Trajectory is an artificial intelligence technology company that provides a continual learning platform for AI models. Its platform captures real-world product usage signals - such as user edits, retries, and corrections - to automatically fine-tune and improve models directly from live interaction data. Founded by former research scientists, the firm offers post-training infrastructure that enables software teams to replace static datasets with continuously adapting AI systems.
How Trajectory hires
Truth index
B 81/100
Ghost roles
0%
Stale roles
75%
Reposted roles
0%
Trajectory scores B on the Alion truth index (A is best, E worst), measured over 4 open roles re-checked against its own hiring board: 0% look like ghost listings, 75% 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
Total raised
$15M
1 round on record
Latest round
$15M
Venture round · May 2026 · 5 mo ago
Team
51-200
employees, estimated range
Hiring now
8
+1 posted in 30 days
Backers
5
Bessemer Venture Partners, BoxGroup
The money's age
Fresh money
5 months since the last round · and hiring
Momentum
40/100
hiring for its size, in the news, fresh money
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
May 31
Raised a round Venture round $15M · Pulse 2.0
Tractionpublic signals, read monthly
Web presence
top 2%
of 133.2M domains by links, Common Crawl
Hacker News stories
2
best: 3 points
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Venture round | May 2026 | $15M | — | Pulse 2.0 |
Backed byfrom the funds' portfolios and accelerator catalogs
BoxGroup Investors in similar startupsfunds that back the companies most like this one
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Easily create and manage datasets to fine-tune LLMs for cheaper, faster, and better performance.
Jobs
In office · Internship · San Francisco
Windsurf
Claude Code
AI Agents
OpenAI
Design
Figma
Apply
In office · Internship · Master's Degree · San Francisco
Windsurf
Claude Code
JAX
AI Agents
PyTorch
Braintrust
OpenAI
Hugging Face
Post-training
Management
Notion
Apply
≈ $196k – $391k per year (Estimated) · In office · Full-Time · San Francisco
Python
C++
Windsurf
Claude Code
vLLM
JAX
AI Agents
SGLang
PyTorch
CUDA
Triton
OpenAI
KV Cache
Design
Figma
Apply
≈ $191k – $381k per year (Estimated) · In office · Full-Time · San Francisco
JavaScript
TypeScript
Windsurf
Claude Code
AI Agents
Braintrust
OpenAI
Hugging Face
Frontend
React.js
Apply
≈ $198k – $393k per year (Estimated) · In office · Full-Time · Master's Degree · San Francisco
Windsurf
Claude Code
JAX
AI Agents
PyTorch
Braintrust
OpenAI
Hugging Face
Post-training
Management
Notion
Apply
≈ $193k – $383k per year (Estimated) · In office · Full-Time · San Francisco
Windsurf
Claude Code
AI Agents
Braintrust
OpenAI
Hugging Face
Apply
Growth
Hiring Momentum
64/100
Growing
Open positions
8
1 opened / 1 closed in 30 days
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.
AI/ML
60% ▲
HR
20% ▲
Sales
20% ▼
Activity Timeline
Added vLLM to stack
Oct 2026
Added Triton to stack
Oct 2026
Added SGLang to stack
Oct 2026
Added PyTorch C++ to stack
Oct 2026
Added Python to stack
Oct 2026
Added KV Cache to stack
Oct 2026
Added CUDA to stack
Oct 2026
Added C++ to stack
Oct 2026
Added GitHub to stack
Oct 2026
Added Stripe to stack
Sep 2026
Added Figma to stack
Sep 2026
Financials
Total raised
$15M
Latest round
Venture - Series Unknown
Funding rounds
1
Funding rounds
| Round | Announced | Amount | |
|---|---|---|---|
| Venture - Series Unknown | 2026 | $15M | Details |
Tech stack
Technologies named in job postings at Trajectory over the last 12 months, by layer, with the share of postings for each.
Technologies in use
21
Postings analysed
8
Stack modernity
72/100
Languages
C++
Python
TypeScript
JavaScript
Frameworks & libraries
JAX
PyTorch
CUDA
React.js
Cloud & platforms
OpenAI
Hugging Face
Figma
GitHub
Sign in to see how your skills match this stack
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Full Trajectory tech stack
21 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
ConvictionVia a fund
Standard CryptoVia a fund
Sequoia CapitalVia a fund
412 portfolio companies
Bessemer Venture PartnersVia a fund
502 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
Probability of an LLM Trajectory: Starting from the Chain Rule
Deriving the probability of a trajectory from the chain rule, then applying it to token generation.
Read more
Report
Trajectory: A Standard Format for Agent Experience Data
Introducing trajectory, an open-source package that normalizes coding-agent sessions from Claude Code, Codex, Letta Code, and other harnesses into one token-efficient format designed for agents learning from past experience.
Read more
Report
Visr - Task Evals for Coding Agent Teams
Visr is focused on helping coding-agent teams turn real agent runs into reusable eval evidence.
Read more
Report
Trajectory Raises $15 Million To Build A Platform For Continual Learning
Trajectory, a research lab and product company focused on continual learning, announced that it has raised $15 million in funding to develop a platform that enables companies to continuously train large-scale agentic models using signals generated from pr
Read more
Report
Normalizing Trajectory Models
Abstract page for arXiv paper 2605.08078: Normalizing Trajectory Models
Read more
Report
Trajectory shapes
Benchmark scores tell you whether a coding agent solved the task. Trajectory shapes tell you how it worked, and those workflow signatures persist b...
Read more
Report
Polynomial Trajectory Optimization for Quadrotors
Why quadrotors minimize snap from first principles, and why obstacle-free waypoints don
Read more
Report
Report
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
8 open roles 5 posted in 90 days 75% engineering 50-200 est. staff
hires for AI/ML, HR, Sales