Top-Selling Points

Rate of Foreigners

Less Than

Frequency of English Usage

Less Than

Short overtime work (less than 20 hours) Japanese learning support Management In-house product development

Top-Selling Points

Rate of Foreigners
Less Than

Frequency of English Usage
Less Than

Short overtime work (less than 20 hours) Japanese learning support Management In-house product development

Related Skills

Management/System project Experience

Tech lead

Programming Language

JavaScript TypeScript Python Go

Design / Graphic / Creative tools

HTML CSS

Library/Framework

React Next.js Vue.js Nuxt.js Django

Cloud / Infrastructure / DevOps tools

AWS

Language Requirements

Required

Preferred

Language Requirements

Required

Japanese: Business

English: Greetings/None

JLPT: None

Preferred

No Data

Job Description

[Business Overview]
[Making the "Analog" of Real Estate Brokerage "Simple"]
・Products: Developing 13 solutions under the "Hayaimon Series," a Real Estate Brokerage DX SaaS.
・Problem Solving: Automating manual tasks such as property data entry, vacancy confirmation, and document preparation for real estate agents.
・Achievements: Implemented in over 3,500 stores nationwide. Driving industry transformation with a top-tier market share.

[Recruitment Background] 
Product expansion has created an urgent need for standardized technical foundations and enhanced quality. As business accelerates through major corporate partnerships, the company seeks an architect to lead technology selection and system design across multiple products. This role involves driving organizational growth from a technical perspective, including hiring and talent development, with a long-term view toward global expansion.

[Job Overview]
As a Senior Software Architect, lead both the organization and the product portfolio through technical selection, design, and quality improvement for the "Hayaimon" series. Working closely with the CTO, the successful candidate will drive technical strategy, organizational design, and development processes in alignment with business goals. This position focuses on technical leadership and hands-on practice rather than pure administration.

[Key Responsibilities]
・Lead technology selection and architectural design.
・Drive improvements in code quality and development productivity.
・Resolve technical product issues and optimize performance.
・Provide cross-functional leadership in implementation, design, and reviews.
・Identify technical risks in new and existing products and propose solutions.

Strengthen the engineering organization through recruitment and mentoring. (Work ratio: 60% Technical Design/Review, 30% Mentoring, 10% Recruitment)

[Organizational Structure]
・Engineering Manager: 1
・Frontend Engineers: 20 (including 2 also handling server-side)
・Server-side Engineers: 2
・Infrastructure Engineers: 2

[Development Environment]
・Languages: JavaScript, TypeScript, HTML, CSS, Python, Go
・Frameworks/Libraries: React, Next.js, Vue.js, Nuxt.js, Django, FastAPI
・Testing: Jest, pytest
・Infrastructure: AWS (EC2, ECS, AWS Batch, RDS, Aurora Serverless V2, Glue, Athena, API Gateway, Terraform)
・Tools: Notion, QuickSight, Git, Slack, Google Meet, GitHub, GitHub Copilot, Claude Code, CodeRabbit, Figma

[Learning Environment]
The company hosts internal study sessions twice a week and covers expenses for attending conferences outside the prefecture.

[Position Highlights]
・Direct collaboration with the CTO on technical strategy and core infrastructure.
・Cross-product leadership ranging from greenfield development to scaling existing services.
・High autonomy to lead improvements based directly on user feedback.
・Exposure to the full product lifecycle, from planning and design to operation.
・Opportunity to work across frontend, backend, infrastructure, and data analysis.
・Clear career progression toward Technical Fellow, VPoT, or CTO candidate roles.
・Significant authority as a management-layer lead contributing to organizational decision-making.

[Desired Candidate Profile]
・Business-Minded Perspective: Ability to make technical decisions (selection, quality, productivity) based on how they contribute to service growth and improvement.
・Team Contribution: Interest in elevating the entire engineering organization’s technical level through code reviews, design discussions, and mentoring.

Required Skills and Experiences

[Mandatory Requirements] ・At least 7 years of development experience in frontend or server-side engineering. ・Proven track record leading technology selection and architectural design. ・History of proactively improving code quality and development productivity. ・Comprehensive knowledge of web infrastructure and the ability to oversee entire system architectures. ・Strong interest and continuous passion for learning all aspects of engineering. [Preferred Requirements] ・Experience launching a 0-to-1 service, regardless of scale. ・Familiarity with building development foundations such as CI/CD and test automation. ・Hands-on experience with cloud-native architectures (AWS, serverless, containers, etc.). ・Demonstrated leadership in development process standardization or organizational improvements. ・Ambition to grow into a CTO, Technical Fellow, or VPoT role. ・Experience in management within an engineering organization. [Desired Candidate Profile] ・Resonates with our corporate vision and professional style. ・Maintains smooth and effective communication with internal team members.

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Working Condition

[Expected Annual Salary]
8,000,000 JPY - 12,000,000 JPY

[Monthly Salary]
667,000 JPY - 1,000,000 JPY (Base salary: 508,190 JPY+ / Fixed overtime allowance: 158,810 JPY+ for 40 hours per month. Excess overtime paid separately.)

[Work Location]
Kayabacho Tower 12F, 1-21-2 Shinkawa, Chuo-ku, Tokyo
‐7-minute walk from Kayabacho Station (Tokyo Metro Hibiya Line)
‐8-minute walk from Hatchobori Station (JR Keiyo Line)
‐9-minute walk from Suitengumae Station (Tokyo Metro Hanzomon Line)

[Working Hours]
・Flextime System
‐Core time: 11:00 AM – 3:00 PM
‐Flexible time: Start 7:00 AM – 11:00 AM / End 3:00 PM – 10:00 PM
‐Standard working hours: 8 hours per day (approx. 160 hours per month)
*Average monthly overtime: 14 hours (previous year's result)
・Remote work: 2 days per week for engineers / 1 day per week for business staff

[Holidays and Leave]
・125 annual holidays: Full weekends off (Sat/Sun), public holidays, New Year, and summer leave.
・Paid leave: 5 days granted upon joining, additional 5 days after 6 months.
・Paid leave utilization rate: 81% (previous year's result)
・Others: Based on company calendar.

[Benefits and Welfare]
・Full social insurance coverage
・Commuting allowance
・High-spec office chairs and choice of MacBook Pro or Windows laptop
・Office lounge/kitchen, free drinks, free rice, and subsidized bento lunches
・Monthly recreation events, weekly shuffle lunches, and company trips
・Book purchase allowance (approx. 20,000 JPY/year), support for study groups/conferences, and certification support
・Influenza vaccinations

RECRUITMENT PROCESS

・Casual Interview (Online) ↓
・Document Screening & Online Aptitude Test ↓
・Interview (Online) ↓
・Final Interview (In-person)
*Please note that the selection process is subject to change depending on the position.

Business (description what they do)

・Planning and development of systems and applications (SaaS) for the real estate industry ・Development and operation of the "Hayaimon Series," a real estate brokerage business support system

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Top-Selling Points

Rate of Foreigners

Less Than

Frequency of English Usage

Less Than

Short overtime work (less than 20 hours) Japanese learning support Management In-house product development

Top-Selling Points

Rate of Foreigners
Less Than

Frequency of English Usage
Less Than

Short overtime work (less than 20 hours) Japanese learning support Management In-house product development

Related Skills

Management/System project Experience

Tech lead

Programming Language

JavaScript TypeScript Python Go

Design / Graphic / Creative tools

HTML CSS

Library/Framework

React Next.js Vue.js Nuxt.js Django

Cloud / Infrastructure / DevOps tools

AWS

Language Requirements

Required

Preferred

Language Requirements

Required

Japanese: Business

English: Greetings/None

JLPT: None

Preferred

No Data

Job Description

[Business Overview]
[Making the "Analog" of Real Estate Brokerage "Simple"]
・Products: Developing 13 solutions under the "Hayaimon Series," a Real Estate Brokerage DX SaaS.
・Problem Solving: Automating manual tasks such as property data entry, vacancy confirmation, and document preparation for real estate agents.
・Achievements: Implemented in over 3,500 stores nationwide. Driving industry transformation with a top-tier market share.

[Recruitment Background] 
Product expansion has created an urgent need for standardized technical foundations and enhanced quality. As business accelerates through major corporate partnerships, the company seeks an architect to lead technology selection and system design across multiple products. This role involves driving organizational growth from a technical perspective, including hiring and talent development, with a long-term view toward global expansion.

[Job Overview]
As a Senior Software Architect, lead both the organization and the product portfolio through technical selection, design, and quality improvement for the "Hayaimon" series. Working closely with the CTO, the successful candidate will drive technical strategy, organizational design, and development processes in alignment with business goals. This position focuses on technical leadership and hands-on practice rather than pure administration.

[Key Responsibilities]
・Lead technology selection and architectural design.
・Drive improvements in code quality and development productivity.
・Resolve technical product issues and optimize performance.
・Provide cross-functional leadership in implementation, design, and reviews.
・Identify technical risks in new and existing products and propose solutions.

Strengthen the engineering organization through recruitment and mentoring. (Work ratio: 60% Technical Design/Review, 30% Mentoring, 10% Recruitment)

[Organizational Structure]
・Engineering Manager: 1
・Frontend Engineers: 20 (including 2 also handling server-side)
・Server-side Engineers: 2
・Infrastructure Engineers: 2

[Development Environment]
・Languages: JavaScript, TypeScript, HTML, CSS, Python, Go
・Frameworks/Libraries: React, Next.js, Vue.js, Nuxt.js, Django, FastAPI
・Testing: Jest, pytest
・Infrastructure: AWS (EC2, ECS, AWS Batch, RDS, Aurora Serverless V2, Glue, Athena, API Gateway, Terraform)
・Tools: Notion, QuickSight, Git, Slack, Google Meet, GitHub, GitHub Copilot, Claude Code, CodeRabbit, Figma

[Learning Environment]
The company hosts internal study sessions twice a week and covers expenses for attending conferences outside the prefecture.

[Position Highlights]
・Direct collaboration with the CTO on technical strategy and core infrastructure.
・Cross-product leadership ranging from greenfield development to scaling existing services.
・High autonomy to lead improvements based directly on user feedback.
・Exposure to the full product lifecycle, from planning and design to operation.
・Opportunity to work across frontend, backend, infrastructure, and data analysis.
・Clear career progression toward Technical Fellow, VPoT, or CTO candidate roles.
・Significant authority as a management-layer lead contributing to organizational decision-making.

[Desired Candidate Profile]
・Business-Minded Perspective: Ability to make technical decisions (selection, quality, productivity) based on how they contribute to service growth and improvement.
・Team Contribution: Interest in elevating the entire engineering organization’s technical level through code reviews, design discussions, and mentoring.

Required Skills and Experiences

After sign up, you can browse all information.

If you already have a GitTap Account, please login.

Working Condition

[Expected Annual Salary]
8,000,000 JPY - 12,000,000 JPY

[Monthly Salary]
667,000 JPY - 1,000,000 JPY (Base salary: 508,190 JPY+ / Fixed overtime allowance: 158,810 JPY+ for 40 hours per month. Excess overtime paid separately.)

[Work Location]
Kayabacho Tower 12F, 1-21-2 Shinkawa, Chuo-ku, Tokyo
‐7-minute walk from Kayabacho Station (Tokyo Metro Hibiya Line)
‐8-minute walk from Hatchobori Station (JR Keiyo Line)
‐9-minute walk from Suitengumae Station (Tokyo Metro Hanzomon Line)

[Working Hours]
・Flextime System
‐Core time: 11:00 AM – 3:00 PM
‐Flexible time: Start 7:00 AM – 11:00 AM / End 3:00 PM – 10:00 PM
‐Standard working hours: 8 hours per day (approx. 160 hours per month)
*Average monthly overtime: 14 hours (previous year's result)
・Remote work: 2 days per week for engineers / 1 day per week for business staff

[Holidays and Leave]
・125 annual holidays: Full weekends off (Sat/Sun), public holidays, New Year, and summer leave.
・Paid leave: 5 days granted upon joining, additional 5 days after 6 months.
・Paid leave utilization rate: 81% (previous year's result)
・Others: Based on company calendar.

[Benefits and Welfare]
・Full social insurance coverage
・Commuting allowance
・High-spec office chairs and choice of MacBook Pro or Windows laptop
・Office lounge/kitchen, free drinks, free rice, and subsidized bento lunches
・Monthly recreation events, weekly shuffle lunches, and company trips
・Book purchase allowance (approx. 20,000 JPY/year), support for study groups/conferences, and certification support
・Influenza vaccinations

RECRUITMENT PROCESS

・Casual Interview (Online) ↓
・Document Screening & Online Aptitude Test ↓
・Interview (Online) ↓
・Final Interview (In-person)
*Please note that the selection process is subject to change depending on the position.

Business (description what they do)

・Planning and development of systems and applications (SaaS) for the real estate industry ・Development and operation of the "Hayaimon Series," a real estate brokerage business support system

Available Jobs in (iimon Inc.)

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[Senior Software Architect]Reporting to CTO | Cross-Product SaaS Lead

[Senior Software Architect]Reporting to CTO | Cross-Product SaaS Lead