Fixstars
fixstars.com
Actively hiring
Quantum Science & Computing
Custom Software Development
High-Performance Computing
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How Fixstars hires
Truth index
D 48/100
Ghost roles
88%
Stale roles
0%
Reposted roles
0%
Fixstars scores D on the Alion truth index (A is best, E worst), measured over 32 open roles re-checked against its own hiring board: 88% look like ghost listings, 0% 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
Overview
Fixstars is a Tokyo company founded in 2002 that specialises in accelerating software on parallel and heterogeneous processors. It optimises code for graphics processors and custom accelerators in genomics, autonomous driving and financial computing, and develops its own high speed storage products. The company also works on quantum inspired optimisation services.
News
Deploying Kimi-K3 on Day 0: Can a 2.8T Model Run on a Single Node of NVIDIA B300 x8?
Introduction On July 27, 2026, Moonshot AI released the model weights for Kimi-K3. Ever since the model was announced on July 16, it had generated significant buzz as "the largest open-weight model in history." At Fixstars, we deployed the model to a sing
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Report
Fixstars AIBooster - Observe and Optimize AI Performance
Install on your GPU server to observe AI workloads, identify bottlenecks, and automatically accelerate training and inference. Cut GPU costs by up to 80% with data-driven optimization.
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Riken, NTT, and Fixstars Amplify launch 'world's first' general-purpose optical quantum computer
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Renesas and Fixstars to Jointly Develop Tools Suite that Optimizes AD and ADAS AI Software for R-Car SoCs
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Fixstars Boasts Performance And Capacity With Drool-Worthy 6TB SSD In 2.5-Inch Form-Factor
When we reviewed the latest 6 terabyte hard drives at the beginning of the year, we acknowledged that, for all the benefits of solid-state drives, capacity and price-per-terabyte remained in the hard drive's
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This 6TB Fixstars SSD could be the last hard drive you'll need for a good long while
Japanese drive maker Fixstars says it will release a 6TB drive by this summer, pushing SSD capacity points to dizzying heights.
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Tech stack
Technologies named in job postings at Fixstars over the last 12 months, by layer, with the share of postings for each.
Technologies in use
45
Postings analysed
14
Stack modernity
78/100AI adopter
Languages
C++64%
Python50%
Rust7%
Frameworks & libraries
PyTorch64%
PyTorch C++50%
CUDA14%
MLIR7%
Cloud & platforms
Windows50%
GitLab43%
GitHub29%
AWS29%
AI & ML
LLM29%
VLM14%
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Full Fixstars tech stack
45 technologies · by team · pay by technology · changes · similar stacks
Growth
Hiring Momentum
70/100
Growing
Open positions
36
2 opened / 0 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.
DevOps
50%
Backend
33% ▲
AI/ML
17% ▼
Activity Timeline
New location: Nagano
Oct 2026
New location: Yokohama
Oct 2026
New location: Fukuoka
Oct 2026
Added Windows Server to stack
Oct 2026
Added VMWare to stack
Oct 2026
Added Nginx to stack
Oct 2026
Offices
Where the company hires and what each office is for
Cities
5
Hiring now
4
Countries
1
Busiest office
Tokyo
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Headquarters
Builds here
Office with open vacancies
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Tokyo
Japan
HQ
31 open roles 5 posted in 90 days 90% engineering $51k Avg Salary
hires for AI/ML, Backend, DevOps
Fukuoka
Japan
Engineering / R&D
3 open roles 1 posted in 90 days 100% engineering $45k Avg Salary
hires for Backend
Yokohama
Japan
1 open roles 100% engineering
hires for Hardware
Nagano
Japan
1 open roles 100% engineering
hires for Backend
Minato
Japan
Regional office
31F BLUE FRONT SHIBAURA TOWER S, 1-1-1 Shibaura, Minato-ku, Tokyo 105-0023, Japan
Jobs
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$38k – $55k per year • In office • Full-Time • Tokyo
GCP
VMWare
Azure
Windows Server
Git
AWS
Docker
Nginx
Windows
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$32k – $49k per year • In office • Full-Time • Tokyo
GCP
VMWare
Azure
Windows Server
Git
AWS
Docker
Nginx
Windows
Apply
In office • Tokyo
C++
LLVM
AI/ML
MLIR
DevOps
GitLab
Linux
Apply
In office • Full-Time • Tokyo
C++
Git
Docker
Ubuntu
GitLab
Management
Slack
Apply
In office • Full-Time • Tokyo
C++
PyTorch C++
AI/ML
PyTorch
DevOps
Git
Docker
Ubuntu
GitLab
Management
Slack
Apply
Apply
Apply
In office • Full-Time • Tokyo
Python
Weights & Biases
RLHF
PyTorch
LLM
SFT
Megatron-LM
NVIDIA NeMo
DevOps
SLURM
AWS
Docker
Kubernetes
Amazon EKS
Amazon EC2
GitHub
Linux
Apply
In office • Full-Time • Tokyo
Python
C++
PyTorch C++
AI/ML
VLM
PyTorch
DevOps
Windows
Game Dev
Unreal Engine
Robotics
ROS2
Isaac Sim
Sim-to-Real
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In office • Full-Time • Tokyo
Python
C++
PyTorch C++
AI/ML
PyTorch
DevOps
Git
GitHub
GitLab
Windows
Apply
In office • Full-Time • Tokyo
Python
C++
PyTorch C++
AI/ML
vLLM
CUDA Toolkit
SGLang
PyTorch
LLM
CUDA
DevOps
SLURM
Git
AWS
Kubernetes
GitHub
GitLab
Windows
Apply