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Careers

Careers

Build sustainability systems that hold up under review

DEISO works with enterprises, suppliers, and public sustainability organizations across LCA, GHG accounting, PCF, EPD, S-LCA, critical review, and ESG evidence. The work is technical, defensible, and built to be verified — and so is how we hire.

DEISO is a small, focused team in Tokyo working with clients in 29+ countries. The work suits people who like deep, methodical problems — clean system boundaries, traceable data, ISO-aligned methodology, defensible documentation — and who want their output to land on the desk of a decision-maker, not in a slide deck.

If you are a sustainability practitioner, technical specialist, or consultant, there are two ways to work with DEISO: full-time and project-based roles, and the DEISO Global Expert Network for independent consultants who collaborate with DEISO on specialized engagements.

LCA and S-LCA GHG accounting PCF and EPD ISO critical review ESG evidence Sustainability OS engineering Capacity building
Open Role Hiring Tokyo · Full-time

Senior sustainability technical reviewer and verification-readiness specialist

DEISO Tokyo · Technical Execution and Independent Review

Execution-focused role supporting technical review, verification readiness, and pre-submission strengthening of sustainability outputs under real project conditions — LCA, GHG accounting, PCF, EPD, and S-LCA work for enterprise and public-sector clients.

Job ID DSJ04162649
Vacancies 1 position
Contract Full-time
Probation 3 months
Apply by June 20, 2026
Applications close June 20, 2026
View role and apply →
Open Role Hiring Tokyo · Full-time

Senior sustainability systems and digital workspace architect

DEISO Tokyo · Sustainability OS Engineering

Execution-focused role designing structured sustainability systems, digital workspace environments, and decision-ready delivery architecture under real project conditions — turning client data, indicators, and documentation into repeatable, verification-ready workflows.

Job ID DSJ04162624
Vacancies 1 position
Contract Full-time
Probation 3 months
Apply by June 20, 2026
Applications close June 20, 2026
View role and apply →
Previously Open Positions

Archived job openings at DEISO

Earlier DEISO openings, kept on file for reference. These roles are no longer accepting applications, but the titles show the kind of work DEISO hires for across technical execution, structured sustainability delivery, digital workspace systems, and expert-led professional roles.

View archived roles →
Digital Twin Engineer Job Opening in Tokyo – Apply Now | DEISO Careers

Job ID: JOBDS0529202589

Number of Vacancies: 2 employees

Workplace: Tokyo.

Contract: Full time

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed

Are you an experienced Digital Twin Engineer with AI skills and a passion for no-code development? DEISO LLC is looking for a forward-thinking engineer to join our Tokyo office and contribute to innovative projects across AI, cloud engineering, and smart infrastructure.

Join DEISO as an AI Engineer (Full-Time | Tokyo or Remote)

Job ID: DSJOB-05282902523

Number of Vacancies: 2 employees

Workplace: Tokyo.

Contract: Full time

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed

DEISO LLC is a Japanese sustainability and technology company at the forefront of AI innovation for environmental and life cycle intelligence. We develop AI-driven platforms such as EcoIN Data AI, CFs Finder AI, Sansu AI, and Kensa AI, which automate and optimize Life Cycle Assessment (LCA), EPD verification, PCF, GHG accounting, and environmental decision-making.

We are seeking a highly skilled and mission-driven AI Engineer to join our expert team and contribute to the development of advanced AI applications for sustainability.

Open Positions: Lead GHG Verifiers (Job ID: DSJOB250120)

Number of Vacancies: 2 employees

Workplace: Tokyo.

Contract: Full time

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed
DEISO LLC is seeking highly qualified and experienced Lead GHG Verifiers to join our expert team. This is an excellent opportunity to work with a leading organization in greenhouse gas (GHG) verification and sustainability.
Life Cycle Assessment (LCA) Specialist (Job ID: DSJOB240907)

Number of Vacancies: 1 employ.

Workplace: Tokyo.

Contract: Full time

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed
DEISO LLC is seeking a highly motivated and experienced Life Cycle Assessment (LCA) Specialist to join our growing team.  In this role, you will play a key role in supporting our sustainability initiatives by conducting LCA studies and promoting the integration of LCA principles throughout our projects.
Personal Assistant to CEO

Number of Vacancies: 1 employ.

Workplace: Hybrid, Remote, Saitama City.

Contract: Part-time.

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed
Hiring a Personal Assistant: DEISO is urgently seeking and employing a personal assistant for DEISO CEO (dei.so):
(1) Native Japanese speaker, (2) business-level English speaker, and (3) resides in Saitama, Japan.
Please contact us (https://dei.so/contact) if you are interested or know someone who is.
Senior Administrative and Technical Assistant

Number of Vacancies: 1 employ.

Workplace: Hybrid, Saitama City.

Contract: Part-time.

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed

We urgently seek a Senior Administrative and Technical Assistant. They can respond to clients’ inquiries from companies in Japan (in Japanese) and international companies (in English) and perform office management daily tasks. Japanese language ability is a must. We welcome candidates with positive, friendly, modest, and positive attitudes who can work in an international business environment.

Technical Assistant

Number of Vacancies: 1 employ.

Workplace: Remote

Contract: Part-time.

Employment Probation Period: 1 month.

Application Deadline: Until the position is filled.

Closed

We are looking for a technical assistant who can respond to client inquiries of Japanese companies. As a member of the DEISO R&D team, this job requires the applicant to grasp the technical aspects of the services we provide and work with experts within an English communication work environment. The applicant will respond to inquiries by Japanese companies, both technically and administratively. Responding to our clients’ inquiries and requests by email, remote meetings, and in-person communication (when needed). You will have to prepare, fill out, and submit documents and applications.

Database Engineer

Number of Vacancies: 1 employ.

Work Place: Remote/Hybrid

Contract: Full time.

Employment Probation Period: 3 months.

Application Deadline: Until the position is filled.

Closed

DEISO is hiring a Database Engineer to join our team for software development. The database engineer will extensively involve a team of researchers, programmers, and designers to develop environmental desktop software and cloud-based applications that serve a wide range of industries as a product. The database engineer is expected to contribute to the product’s development fully.

Software Engineer

Number of Vacancies: 1 employ.

Work Place: Sendai, Japan.

Contract: Full time.

Employment Probation Period: 3 months.

Application Deadline: Until the position is filled.

Closed

DEISO is hiring a Software Engineer to join our team for software development. The successful candidate will develop environmental sustainability software in collaboration with a Database Engineer and Senior Researchers.

Administrative Assistant

Number of Vacancies: 1 employ.

Work Place: Sendai, Japan.

Contract: Part-time.

Employment Probation Period: 3 months.

Application Deadline: Until the position is filled.

Closed

A position an Administrative Assistant position is open at DEISO to support the administration work and management of the company. This position requires full Japanese proficiency and a business level of English communication, demonstrating a professional office administration and management.

Close
Close

Contact Info.

English Address:
Level 21 Shiodome Shibarikyu Building
1-2-3 Kaigan, Minato-ku
105-0022 Tokyo, Japan.

Japanese Address:
〒105-0022 東京都港区海岸1-2-3
汐留芝離宮ビルディング21階, 合同会社DEISO.

Phone (JP): /
Phone (EN):
Fax: /
Email:

Latest News

Get Started with DEISO the Easy Way!

Go go.dei.so
Seven ways to start

Choose the entry point that fits where you are

Not every visitor knows what they need on day one. These seven onboarding paths cover the full range — from knowing exactly which service you want to starting from a question and letting AI guide you. Pick whichever fits.

1If you know what you needRecommended Find the right DEISO service Match your requirement to the right DEISO service in a few clicks. Filter by LCA, GHG, PCF, EPD, ESG, critical review, S-LCA, waste, circular economy, EIA, and more. Fastest path if you already know the scope. Good for “We need Scope 3 review and pre-submission checks before verification” or “We need an EPD prepared for EN 15804.” Open service finder → 2If you’re building internal capabilityRecommended Explore capacity building programs Match your team to the right DEISO training program — LCA, GHG accounting, PCF, EPD development, ESG reporting, environmental review, ISO 14001, and sector programs. Filter by role, level and format. Good for Teams building in-house LCA, GHG or EPD capability, and organisations aligned with workforce development priorities such as Saudi Arabia Vision 2030. Open training finder → 3If you need technical direction before engagementRecommended Free Technical Evaluation Request an initial technical evaluation for your sustainability requirement before committing to a full engagement. DEISO reviews your project need, technical context, enterprise requirement, reporting objective, and service direction to help identify the right path. Good for Enterprises, suppliers, and public sustainability teams that need technical direction before starting LCA, GHG, PCF, EPD, ESG, or sustainability operating system work. Start free evaluation → 4If you want an answer fast Use quick search Click the search icon in the page sidebar, or press Ctrl Shift Del to open the finder from anywhere on the site. Built for quick keyword lookups when you want results in seconds. Good for Anyone who already knows the term they are looking for — a standard, a service name, a training program — and wants to land on it without navigating. Open quick search → 5If you want to explore in depth Use advanced search Search across the full DEISO knowledge base — services, solutions, methodology, case studies, articles and technical resources. Best for when you want to research first, decide later. Good for Researchers, procurement teams and technical leads comparing methodology depth before opening a conversation. Open advanced search → 6If you’d rather see everything at once Browse the full site map A single index of every page and every article on the site — services, training programs, solutions, methodology, case studies and news. Filter it as you type, or read the structure top to bottom. Good for Returning visitors looking for a page they have seen before, and anyone who would rather scan the whole structure than answer filter questions. Open the site map → 7If you’d rather ask a questionAdvanced Ask Mirai AI DEISO Mirai™ AI Pro is DEISO’s AI guidance assistant. Ask a question about your sustainability need — it maps you to the right service, explains the approach, and hands off to the DEISO team when you’re ready. Try asking “What do we need to prepare for CSRD Scope 3 disclosure?” · “How do we start a product carbon footprint?” · “Which DEISO service fits an EPD project?” Ask Mirai →
Everything else you may need

Explore DEISO further

Not ready to start on a specific path? These pages give you the fuller picture — the core identity, the platform layer, past work, and how to reach the team.

Sustainability Operating Systems DEISO’s core identity — how the operating system model works and why it changes what sustainability execution looks like. Explore → All services The full catalogue of DEISO services across LCA, GHG, PCF, EPD, ESG, and adjacent sustainability execution. See services → Solutions DEISO solutions organised by industry challenge and business outcome — from decarbonisation to circular economy. See solutions → Platforms DEISO Visly, DEISO Spark, and the platform layer that supports every DEISO client engagement. See platforms → Case studies Real DEISO engagements across LCA, GHG, EPD and adjacent programs — with the outcomes clients actually cared about. Read cases → Our clients Enterprises, suppliers and public sustainability bodies DEISO has supported across regions and sectors. See clients → Company profile (PDF) DEISO’s structured company profile — for procurement, tenders and executive review. Open PDF → Contact DEISO Direct contact page with regional and departmental routing — for scoping calls, tenders and partnership discussions. Contact us →
Ready to engage

Request a quotation or send a direct enquiry

When you know the scope and are ready to move, submit a structured request — DEISO will scope the engagement to your context. Direct enquiries can also be sent to

Request a quotation → Email →