Clockwork
clockwork.io
Actively hiring
AI Compute & Inference
DevOps & Platform Engineering
High-Performance Computing
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Overview
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Total raised
$20.6M
2 rounds on record
Latest round
$20.5M
Venture round · Sep 2025 · 13 mo ago
Team
13
US Form 5500 (plan participants) · Dec 2024
Hiring now
9
+4 posted in 30 days
Backers
2
Premji Invest, NEA
The money's age
Due for its next round
13 months since the last round · and hiring
Momentum
33/100
hiring for its size, in the news
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
Sep 10, 2025
Raised a round Venture round $20.5M · SiliconANGLE
Nov 20, 2023
Raised a round Convertible Note $130k · SEC Form D
Mar 17, 2022
Launched on Hacker News Show HN: Latency Sensei – uncover subpar VMs and network hiccups on major clouds
2021
Founded
Tractionpublic signals, read monthly
Web presence
top 2%
of 133.2M domains by links, Common Crawl
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Venture round | Sep 2025 | $20.5M | — | SiliconANGLE |
| Convertible Note | Nov 2023 | $130k | — | SEC Form D |
Registers and programsofficial lists and records that name the company
| Legal entity | Clockwork Systems, Inc. | its site |
Founders and leadersfrom filings, registers and the company's site
Jesse ClemmensExecutive Officer, DirectorSEC Form D
Backed byfrom the funds' portfolios and accelerator catalogs
Premji Invest 
NEA Investors in similar startupsfunds that back the companies most like this one
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How Clockwork hires
Truth index
A 95/100
Median time to fill
252 days
Ghost roles
0%
Stale roles
0%
Reposted roles
0%
Clockwork scores A on the Alion truth index (A is best, E worst), measured over 6 open roles re-checked against its own hiring board: 0% look like ghost listings, 0% have gone stale and 0% are the same role posted again. Its roles close in a median of 252 days. 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
Overview
Clockwork, operated by Clockwork Systems, Inc., builds software that optimizes GPU clusters for fault tolerance, deterministic performance and higher utilization. Its products target large distributed AI training and inference workloads that depend on GPUs staying tightly synchronised, including RDMA networking and failure recovery through its TorchPass product line. The company is headquartered in Palo Alto, California, United States.
News
The Clockwork Moss Tee: Cutting Through Greenwashing with GOTS-Verifie
If you're tired of vague claims and the constant whisper of greenwashing, I get it. We all do. The internet is a minefield of labels that promise everything but deliver little proof. Most 'sustainable' tees are indeed a scam, precisely because they lack t
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Report
Common Approaches to Fault Tolerant AI Training & Selection Framework
When a GPU falls off the bus in a large distributed training run, it is catastrophic. The failed GPU is not the expensive part. The expensive part is the blast radius: hundreds or thousands of healthy GPUs waiting, timing out, restarting, and rolling back
Read more
Report
Clockwork and Multipath Reliable Connection (MRC)
MRC: A Step Forward for GPU Networking - May 9, 2026 On May 5th, OpenAI announced MRC (Multipath Reliable Connection), a new open RDMA transport co-developed with AMD, Broadcom, Intel, Microsoft, and NVIDIA, and released through the Open Compute Project.
Read more
Report
The AI Infrastructure Inflection Point: How Tightly-Coupled Synchronized Clusters Are Redefining the Data Center
TL;DR The data center is undergoing a fundamental architectural discontinuity, moving from loosely coupled, independent request handling to Tightly-Coupled Synchronized Clusters for large-scale AI training and distributed inference. This new design requir
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Report
Report
TorchPass AI Fault Tolerance
At scale, distributed AI training is notoriously fragile. Just one link flap or GPU fault can crash an entire long-running job and leave hundreds or thousands of GPUs idle. With 1,024 GPUs, the cost of failures can add up to more than $300,000 per month,
Read more
Report
A Comparison Between TorchFT and TorchPass for Fault Tolerant Training
Download Blog TorchFT and TorchPass both address fault tolerance for distributed AI training, but in doing so, use fundamentally different mechanisms. TorchFT, developed by Meta, provides per-step fault tolerance, treating each training step as a distribu
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Report
Fault Tolerance Benchmark: Clockwork TorchPass, TorchFT and checkpoint restart
Download Blog Keeping Distributed Training Running Through Failures tl;dr: we randomly injected failures during TorchTitan Llama-4 MoE Scout (109B) training to evaluate the fault tolerance performance of standard checkpoint restarts, Clockwork TorchPass a
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Report
Show more news
Tech stack
Technologies named in job postings at Clockwork over the last 12 months, by layer, with the share of postings for each.
Technologies in use
49
Postings analysed
14
Stack modernity
66/100
Languages
C++57%
Python57%
Go36%
Java21%
Frameworks & libraries
NCCL36%
PyTorch29%
CUDA14%
PyTorch C++14%
Cloud & platforms
Kubernetes50%
Azure36%
Linux29%
AWS21%
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Full Clockwork tech stack
49 technologies · by team · pay by technology · changes · similar stacks
Salary insights
Compensation ranges based on this company's open jobs
Median
$210k
Typical range
$175k – $230k
Open positions
8
7
Jobs
Middle
14.3%
Senior
85.7%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Middle | 1 | $175k | $175k |
| Senior | 6 | $220k | $180k – $230k |
Highest paying role
Senior Software Engineer – Time Synchronization
$230k
Normalized to USD per year
All salaries at Clockwork
By role, level and city, against the market · 8 jobs with pay
People
Jesse Clemmens
Executive Officer, Director
Names and roles come from public filings, company registers and the company's own site. Is this you? Correct or remove · How we handle this data
Growth
Hiring Momentum
73/100
Growing
Open positions
9
3 opened / 4 closed in 30 days
Median time-to-fill
255 days
faster than 7% of the market
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.
Backend
38% ▲
AI/ML
13% ▲
DevOps
13% ▲
QA
13% ▼
HR
13% ▲
Sales
13% ▼
Activity Timeline
Added Machine Learning to stack
Oct 2026
Added TCP/IP to stack
Sep 2026
Added DNS to stack
Sep 2026
Added Linux to stack
Sep 2026
Added Django to stack
Sep 2026
New location: London
Sep 2026
Added Time Series Forecasting to stack
Aug 2026
Added HPC to stack
Aug 2026
Added GitLab to stack
Aug 2026
Added GitHub to stack
Aug 2026
Added NCCL to stack
Aug 2026
Added InfiniBand to stack
Aug 2026
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
Palo Alto
Palo Alto
United States
HQ
9 open roles 8 posted in 90 days 89% engineering 50-200 est. staff $208k Avg Salary
hires for Backend, AI/ML, DevOps
Earlier presence
London, United Kingdom
Jobs
$150k – $210k per year • Equity • In office • Palo Alto
C++
PyTorch C++
AI/ML
CUDA Toolkit
PyTorch
CUDA
NCCL
InfiniBand
Apply
$150k – $230k per year • Equity • In office • Bachelor's Degree • Palo Alto
Python
PyTorch
NCCL
Machine Learning
DevOps
SLURM
Kubernetes
Apply
$150k – $230k per year • Equity • In office • 5+ years exp • Palo Alto
C++
HPC
Linux
Apply
$140k – $200k per year • Equity • In office • Bachelor's Degree • Palo Alto
Python
Go
Java
C++
Apply
Apply
$140k – $210k per year • Equity • In office • Bachelor's Degree • Palo Alto
Python
Go
Rust
C++
Anomaly Detection
Time Series Forecasting
NCCL
InfiniBand
DevOps
Splunk
GCP
OpenTelemetry
Datadog
Prometheus
Azure
AWS
Kubernetes
Grafana
eBPF
SLI/SLO/SLA
HPC
Linux
TCP/IP
DNS
Cybersecurity
Wireshark
Tcpdump
Apply
$150k – $230k per year • Equity • In office • 6+ years exp • Palo Alto
C++
eBPF
Linux
Apply
$130k – $175k per year • Equity • In office • 3+ years exp • Palo Alto
Python
Kubeflow
PyTorch
NCCL
InfiniBand
DevOps
Terraform
GCP
Helm
GitHub Actions
GitLab CI
SLURM
Azure
CI/CD
Jenkins
AWS
Docker
Kubernetes
Bazel
Linux
QA
Playwright
Pytest
Apply