【社員インタビュー】10社を渡り歩いたベテランが、建設用3Dプリンタで「全部やる」——組み込みエンジニアの仕事
「自分の技術を役立てたい」。組み込みエンジニアとして製造業に長く携わった池袋宗正さんは、これ…
PRINTINGTHEFUTURE
Polyuse Recruiting
Breaking new ground together
Supporting Japan's future with construction 3D printers. Polyuse is looking for people to build that frontier with us.
Join us
For anyone who wants to remake the very foundations of industry with technology that does not yet exist.
This is a letter from Polyuse first, and a job posting second. Read it to the end, and if it moves you, please come and meet us.
About us
The world Polyuse is building
Building tomorrow's infrastructure
Starting with the real-world use of construction 3D printers, we are building a new foundation to support the next generation of construction.
It means building a new foundation for construction that can keep supporting people's lives, even in an era of sweeping change: labor shortages, aging infrastructure and ever more severe natural disasters.
With the construction 3D printer as our starting point, we connect design, construction, materials, quality control, data and more, and bring new systems and new ways of thinking about construction into society.
What we build is used on site and improved, know-how accumulates, and its value is handed on to the next site, the next region, and then the next generation.
“Building tomorrow's infrastructure” means carrying not only the technology but the know-how, the systems and the connections between people into the future, and continually creating a foundation for construction that society cannot do without.
That is our Vision.
Representative Director / Co-founder
Takuya Iwamoto
Who we are looking for
“We want people who build the system, not people who work on top of one.”
Honestly, if you want to step into a system that is already finished, this is not the company for you. We want people who want to be the ones deciding, in a field where the rules and standards are still being written. People who can make an unprecedented move while respecting the skill and wisdom that construction sites have built up. People who can enjoy the days when things go wrong. With people like that, we want to “break new ground together” and create the next normal.
Representative Director / Co-founder
Wataru Ooka
Who we are looking for
“We don't back down because it's hard. For people who want to feel their work move society.”
What we are taking on is construction itself, an industry where big change has long been slow to come. Our aim is not to improve it, but to redefine it. That means never looking away from the real problems on site, never backing down because something is hard, and wanting to feel your own work move society. It isn't an easy road. Even so, it is a challenge that truly matters. We'll be waiting for you at the very heart of that change.
Our Achievements
Where our challenge stands today
Solving the problems on construction sites close to home.
Severe labor shortages, aging infrastructure, and the need to respond quickly to increasingly destructive disasters. This isn't a story about someone far away. It's about the bridge you crossed today, the sidewalk you walked on, and the waterway beneath them. Construction sites are losing their people. Polyuse will keep taking on the challenge of changing that.
Share of formwork carpenters aged 50 or over
45%
Share of road bridges over 50 years old*MLIT estimate for 2040
75%
Frequent disasters × aging infrastructure. Repair has to keep pace with breakdown.
Worsening disasters
It’s already in your town.
1Catch basin
One-off pieces printed to fit the shape of each site. 3D printing pays off most on small structures that take a lot of formwork labor.
Delivering results.
Total funding raised
5.5B JPY
*As of July 2026
Share of 3D-printed construction in Japan
90%+
*JSCE survey, December 2024
“I was won over by the way they make it happen: development tied closely to the site, with speed and passion.”
An interest in construction 3D printing led me to the Polyuse team just before the company was founded, and before I knew it, we were running alongside them. Things that seemed impossible at the time became reality through development tied closely to the site, speed and passion, and that has kept winning me over. And it's not just us: I can feel the partner network, which started with a single company, rapidly expanding nationwide.
Yoshimura Kensetsu Kogyo Co., Ltd.Representative Director & Senior Managing Director
Seiichi Yoshimura
“They're now entering the exciting phase where it really starts to scale.”
Polyuse is developing construction 3D printers to transform the general contracting industry, a market worth tens of trillions of yen. By combining hardware, software, materials and on-site knowledge, they have established technology that is hard to imitate, and with mass production now in sight, they are entering the exciting phase where it really starts to scale!
Coral CapitalFounding Partner
Yohei Sawayama
FY2022–2025
MLIT Infrastructure DX Award 4 years running
FY2025
Urban Park Competition MLIT City Bureau Director-General's Award
FY2023
METI Top 100 startups working with government “J-Startup” selection
FY2022
Nikkei X-Trend 100 companies building tomorrow's markets
FY2022
Nikkei Architecture 100 ventures updating construction
FY2021
Shukan Toyo Keizai 100 remarkable ventures
Our Challenge
Polyuse's next challenge
There are problems we can solve with you on board.
Technology
HARDWARE
Printer body & mechanism control
- How to develop, design, prototype and evaluate the 3-axis drive and its peripheral equipment, all the way to launching mass production
- How to design and build everything from circuit boards to control panels for the next-generation platform, and optimize it as a whole
- How far the user experience can go by developing a 3D printer system that includes communications and optimizing its control
SOFTWARE
Management & design software, data platform
- How to design and build the web application at the core of the service, manage its quality and create a seamless end-to-end experience
- How to implement slicer algorithms and a system that generates print data easily
- How to raise print quality and accuracy by applying machine learning and image and video analysis
MATERIAL
Premixed mortar materials
- How to develop 3D-printing materials, starting from mix design and material properties
- How to build a system that guarantees quality, from evaluating premixed materials to methods for assessing printed parts
- How to build numerical analysis models that predict collapse during printing
Growth
SALES
Solution sales & business launch
- How to build a sales operation on the scale of hundreds of millions of yen in a fast-growing market
- How to establish a model for demanding solution sales that goes deep into clients' management challenges
- How to lead adopting partners' new businesses to success, from strategy design to launch
CUSTOMER SUCCESS
Solving site issues at their root
- Stand on site and dig into why the work behind the drawings and schedules takes so much effort, then find the one move that changes that experience.
- Rather than building the shape you are handed, start from the role the structure should really play, and create the method and quality standards themselves.
- How to support success, from onboarding to satisfaction surveys and feeding customers' voices back into the company
PRODUCTION MANAGEMENT
Production management
- How to support construction 3D printers, from regular maintenance and troubleshooting to training in print operations
- How to oversee delivery and quality control for printed structures made across the country
- How to turn drawings and 3D models into G-code the printer can run, balancing quality and speed for the data delivered to print sites nationwide
Corporate
CORPORATE
HR, accounting, legal, IP & PR
- How to keep hiring running accurately as Polyuse grows fast
- How to lay the foundations of the organization as it grows toward 200 employees
- How to run management meetings and improve business performance alongside the leadership team
BizOps
BIZOPS
Structuring management issues, building systems
- How to make project bottlenecks visible and put improvements in place
- How to structure abstract management challenges and drive projects forward
- How to design and improve systems that hold up as the business scales
Team Voices
Why Polyuse?
Team Voices
Leaving a society the next generation can be proud of.
We can all live with peace of mind because the infrastructure is there. Now that it's quietly starting to crumble, this felt like work that could protect what this country takes for granted.
— Sales
When I learned about the social problems Polyuse is trying to solve, I felt that if I didn't act here, I'd leave my children a society they couldn't be proud of.
— Customer Success
Making things, contributing to society, and passing something on to the next generation. A business where those three overlap felt worth staking my life on.
— Hardware Engineer
Team Voices
Building technology that doesn't exist yet, with my own hands.
Civil structures we'd rather build with curves had to be right-angled because of the labor involved. With a 3D printer, I can design smooth, rational shapes with my own hands.
— Structural Design Engineer
I'd never seen a 3D printer like Polyuse One. Rather than work on top of polished SaaS, I wanted to build something that doesn't exist yet with my own hands.
— Software Engineer
I didn't want my research to stop at papers. I want to bridge research and the site, and grow construction 3D printing into a practical technology.
— Materials Engineer
Team Voices
Taking on the problems of a vast industry.
I was drawn to how Polyuse takes on new change from within, while keeping its respect for an industry that has long supported society.
— IP & Legal
Whether a vast industry like construction can change comes down to people. Bringing those people together and building the organization felt like the most socially meaningful work.
— HR
More than making something new from scratch, I felt the impact of adoption: our structures being used on site, and construction 3D printing spreading across the country.
— Production Management
Creating an overwhelming “wow”
What matters to us
VALUE 01
Real‑Real‑Real
Sound judgment comes only from what is real. On a construction site there are problems and tacit knowledge that data and documents never show. So we face the real site, the real thing and the real situation, and sharpen our resolution with firsthand information that carries its background and context. The point is not “going to the site.” It is going to get the facts ourselves, so that decisions and execution are never armchair theory.
VALUE 02
Try Fast, Build Faster
Try at the best possible speed, and see it through into something of value. Speed is a competitive edge. Big results come neither from thinking alone nor from trying alone. Once we have done the thinking that is needed, we move right away, learn from the site and our customers, and carry that into the next challenge. But Try exists for the sake of Build. Trying is never the goal in itself: what we decide to do, what we agree on and the value we owe others, we see through until it takes a form they can truly feel.
VALUE 03
Win as one team
Go beyond your own role and take responsibility for the team's win. No big challenge can be met alone. Polyuse's value is created only when customers, sites and partners, along with technology, business and organization, all mesh together. So we take responsibility not only for our own role but for the results of the whole team. We bring diverse expertise together, support each other across roles, and, when it counts, step forward ourselves.
Members
The people you'll work with
Special Interviews
- Read on note
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Open positions
Software
Hardware
Material
Sales
Customer Success
Want to talk first?
It's fine if none of the roles above fit. If you're even a little interested, let's start with a relaxed chat. Together, we'll work out which of our unsolved problems your experience could make a difference on.
Request a casual chatPolyuse still has plenty of layers left to build. Come build the next layer with us.
If you already know you want to apply
Apply directly
About 3–4 weeks from application to offer
Application review
We usually reply within a week
Online interviews
We may meet more than once, depending on your situation
Final selection
An offer within about 3–4 weeks
If you would like to talk first
Casual chat
Weekday evenings too. This is not a screening.
Request a chat
We usually reply within three days
Online interviews
We may meet more than once, depending on your situation
Final selection
An offer within about 3–4 weeks
FAQ
You will be based at our development site in Fujisawa City, Kanagawa Prefecture. We will share the exact address during the selection process.
How often you come into the office varies by position. Depending on the nature of your work, we encourage a sensible balance between working in the office and working remotely.
We use a flextime system with no core time; flexible working hours run from 7:00 to 22:00.
How often you come into the office varies by position.
In addition to Sundays and public holidays, you can take one day of your choice off between Monday and Saturday.