What J.I developer does

J.I developer is a Japanese construction-technology company founded in 2015 and headquartered in Yokohama's Minato Mirai district. The company combines construction-industry domain expertise with proprietary AI and SaaS development to address structural pain points in the Japanese construction sector, in particular labor shortages, document-heavy workflows, and inefficient on-site communication. It sells four core products: J-smart 足場図面 (an AI-powered BPO service that automates scaffolding plan, elevation, detail drawings and 32-page strength calculations compliant with labor-standards-office submissions), jepro (a free-forever web application for organizing construction photos into ledger-format documentation with PDF/Excel export), J-force (a project, cost, schedule, document, and attendance management platform with real-time sharing between general contractors and subcontractors), and JEMOLINK (a digital signage system for construction sites with a proprietary algorithm for weather-, time-, and schedule-aware content delivery plus real-time WBGT heat-stroke risk alerts). Its primary customers are Japanese scaffolding contractors, general construction companies, and on-site project managers and foremen.

Technically, J.I developer applies AI in three distinct modalities: generative AI for PDF trace recognition and automated scaffolding drawing generation, an optimization algorithm for context-aware signage content selection, and predictive analytics for real-time WBGT-based heat-stroke risk. The technology is described as proprietary and tailored to Japanese construction regulations, including labor-standards-office submission formats.

Commercially, the company runs a heterogeneous go-to-market: product-led growth with a free-forever self-serve model for jepro, per-unit pricing (¥15,000/drawing; ¥3,000-12,000 for strength calculations; ¥8,000+ for road-occupation diagrams) for J-smart, and enterprise direct sales for J-force and JEMOLINK with pricing not publicly disclosed. The company also operates a parallel construction services business covering large-scale exterior wall repair and interior renovation. The company is private, founder-led by Representative Director CEO Daisuke Sasaki (嶋﨑 大輔), with no disclosed external funding rounds or institutional investors, and operates primarily within Japan's Kanto region.

Name

J.I developer

Legal name

株式会社J.I developer

Website

https://ji-d.co.jp

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

J.I developer is a Yokohama-based construction-technology company that builds AI and SaaS products for the Japanese construction industry. Its portfolio includes J-smart (AI scaffolding drawing BPO), jepro (free construction photo ledger), J-force (project management), and JEMOLINK (construction-site digital signage), serving scaffolding contractors and construction companies.

Ownership category

akta.pro rank

Product category

Construction Technology Software

NAICS

Drafting Services (541340), Engineering Services (54133), Architectural, Engineering, and Related Services (5413)

SIC

Services-Computer Programming Services (7371), Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Construction & Engineering ERP (Job Costing, Project Controls) (HDAEAEAE)

Keywords

• Construction SaaS software
• AI construction drawings
• Scaffolding drawing automation
• Construction project management
• Construction photo management

Headquarters

HQ city

Nishiku

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations

Revenue model

1. jepro - Freemium Construction Photo Ledger: Free-forever product ledger service for construction photos. All features are permanently free with unlimited users, unlimited storage, and Excel export. This product drives user acquisition and brand awareness in the construction market.
2. J-smart Scaffolding Drawing BPO Service: Per-drawing BPO service where customers pay per unit for AI-generated scaffolding drawings and strength calculations. Pricing is per drawing or calculation type. No monthly fixed fees.
3. J-force Project Management Platform: SaaS platform for construction project management, cost management, and document management. Likely subscription-based with per-project or per-seat pricing implied by enterprise sales motion.
4. JEMOLINK Digital Signage: Digital signage system for construction sites with subscription or per-deployment pricing. Provides remote management capabilities for multiple construction site displays.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels4 records

Core offering

J.I developer develops and sells AI-powered SaaS products and BPO services for the Japanese construction industry. Its core offerings include J-smart, an AI BPO service that auto-generates scaffolding plan drawings and strength calculations from PDF input; jepro, a free construction photo ledger web app; J-force, a construction project and cost management platform; and JEMOLINK, a digital signage system for construction sites. The company also operates a construction services business covering large-scale exterior wall repair and interior renovation.

Product overview

J.I developer is a construction technology company offering a portfolio of four core SaaS products targeting the construction industry. The product lineup includes: (1) J-smart 足場図面 - an AI-powered BPO service that automates scaffolding drawing generation; (2) jepro - a free construction photo ledger application for creating and managing photo documentation; (3) J-force - a project and cost management platform for construction projects; and (4) JEMOLINK - a digital signage system for construction site information delivery. The company combines AI technology development with construction industry expertise to address structural challenges in the sector through digital transformation.

Differentiator

Problem solved

Functional benefit

Brands

• jepro: 施工写真台帳サービス (Construction photo ledger service) - Free forever construction photo management and PDF/Excel output tool
• J-force
• JEMOLINK
• J-smart 足場図面

Products and services

• J-smart (J-smart Scaffolding Drawings) AI BPO service for scaffolding companies that automates creation of scaffolding plan drawings (plan view, elevation view, detail drawings) and 32-page strength calculation documents compliant with labor standards office requirements. Customers submit PDF trace input and receive completed drawings in as little as 1.5 weeks.
• jepro Free-forever web application for construction and architecture professionals that organizes construction photos into ledger format with PDF and Excel export. Supports batch upload of up to 20 photos, unlimited users, and unlimited storage.
• J-force Project management and cost management platform specialized for the construction industry. Offers real-time cost tracking, Gantt chart progress management, document management with deadline alerts, GPS-based mobile attendance recording, and real-time sharing with general contractors and subcontractors.
• JEMOLINK Digital signage system for construction sites that automatically delivers optimized content via a proprietary algorithm based on time of day, weather, and construction schedule. Displays safety information, work instructions, meeting schedules, and real-time heat stroke (WBGT) risk data. Supports remote multi-site management from PC or smartphone.

Quantifiable outcome

• 23% cost reduction in scaffolding drawing production vs market rates
• +3 more outcomes

Segments2 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability7 records

Feature6 records

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• ANDOR (Andor System Support): Japanese vendor of construction-specific 2D/3D CAD and steel/scaffolding design software with strong penetration among specialty trade contractors. Directly comparable to J-smart on scaffolding drawing and structural calculation workflows in the same Japanese market.
• MetaMoJi: Provides digital pen, form, and field-documentation solutions for Japanese construction and industrial sites. Comparable to jepro's photo-ledger use case and JEMOLINK's digital signage workflows, with overlapping customers in Japanese construction site digitization.
• Fukui Computer Architect: Japanese vendor of architecture and construction CAD/BIM software serving the same Japanese construction drafting and design workflow that J-smart targets with its AI scaffolding drawing service. Directly comparable in customer segment (Japanese architects, contractors) and product category (construction design software).
• SpiderPlus & Co. Japanese construction SaaS offering drawing management, photo documentation, and site inspection apps for general contractors and specialty trades. Direct overlap with jepro (photo ledger) and J-force (document and project management) on the same Japanese construction SMB customer base.
• B-EN-G (Business Engineering): Japanese vendor of construction ERP and product data management (mcframe, SUPERWORKS) for general contractors. Directly comparable to J-force as a construction-industry ERP for cost, schedule, and document management in the same Japanese market.
• NJC (Nihon Joho Create): Provides construction industry accounting, payroll, and document management software for specialty trade contractors in Japan. Closely comparable to J-force on cost management and to J-smart/JEMOLINK customers as another vendor digitizing Japanese construction back-office and site workflows.
• KENSETSU SYSTEM (Kensetsu System): Provides construction ERP, job-costing, and project-control software widely used by Japanese general contractors and specialty trade contractors. Closely comparable to J-force's construction project and cost management capabilities and to the customer segment J.I developer serves.

Broad incumbents

• Autodesk Construction Cloud: Global construction design, BIM, and project management suite spanning CAD, takeoff, and field management. Comparable to J-smart (AI scaffolding drafting) and J-force (project management) at a broader and more international scale, and a likely integrator or competitor for AI-driven construction drafting.
• Procore Technologies: Global construction project management and cost management SaaS platform. Broadly comparable to J-force as a category leader; Procore Japan represents the international benchmark J-force must compete against as the Japanese construction market digitizes.

Emerging players

• Infomart: Japanese B2B platform for order, invoice, and document exchange between construction general contractors and specialty trades via its BtoB platform. Adjacent to J-force (cost and document management) and JEMOLINK (site communication) with overlapping construction industry digitization themes.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about J.I developer