RAKUS Co., Ltd.

【AI Engineer】Tokyo｜Hybrid work｜SaaS solutions adopted by 15,000+ companies

Backend Engineer 1 More

5M - ***M JPY

Tokyo

Full-time (permanent)

Online Interview: Yes

Remote Work from Overseas: No / From Japan: Yes

Top-Selling Points

Rate of Foreigners

Less Than

Frequency of English Usage

Less Than

Remote work Flex-time High utilization rate of paid leaves Plans for overseas expansion In-house product development No dispatch

Top-Selling Points

Rate of Foreigners
Less Than

Frequency of English Usage
Less Than

Remote work Flex-time High utilization rate of paid leaves Plans for overseas expansion In-house product development No dispatch

Related Skills

Programming Language

Java

Language Requirements

Required

Preferred

Language Requirements

Required

Japanese: Native

English: Greetings/None

Preferred

No Data

Job Description

【Hiring Background】
At Rakus, we have an AI/Machine Learning development team that has been working on projects such as our in-house AI-OCR system. To further enhance the AI-powered features in our services, we are strengthening the structure of this development team.
Note: This is not solely a research and development team but one dedicated to developing AI systems specifically for use in our services.
*The team is still relatively new and currently small, but we plan to expand it to a structure of 7-8 members.


【Job Description】
●Develop cutting-edge AI engines and models from scratch to add significant value to our services.
●Oversee the entire process of designing, developing, and releasing features that incorporate advanced AI technologies to enhance our services.

▼ Team Members' Backgrounds:
●One team member has served as a tech lead at several AI startups, working on diverse projects involving image, natural language, and numerical data. With experience ranging from model creation to system integration, they have a proven track record of implementing AI solutions.
Joined Rakus in 2021 as the first AI engineer and has been dedicated to enhancing customer value through AI implementation.

【Development Environment】
Programming Languages: Python, Go, Java, etc.
Frameworks and Libraries: TensorFlow, Keras, PyTorch, etc.
Development Environment: Mac, Linux, Windows, AWS, GCP
Code Review: Pull Request-based (using GitLab Merge Requests)
Version Control System: GitLab
Ticket Management System: GitLab

【Challenges to Tackle】
You will primarily work on developing features that assist with input and data creation for our services. This includes not only implementing machine learning models and algorithms but also integrating them into actual systems (e.g., API implementation) as part of AI system development.
The development will mainly focus on areas such as image recognition, natural language processing, and data analysis.

【Attractions】
⒈ As a relatively new development team, you will have the opportunity to play a pivotal role as a core member in shaping its future.
⒉ Collaborate with AI specialists with extensive experience to drive both projects and organizational growth.
⒊ Engage in end-to-end development of machine learning engines and models, including selecting development environments, libraries, and algorithms.
⒋ Enjoy a collaborative environment fostering a culture of "creating great solutions together."
⒌ With most executives (4 out of 6) having engineering backgrounds, it is an environment where engineers' opinions are well-understood and valued.

【Team Structure】
Manager (Male, 50s)
2 team members
*The company has approximately 250 engineers overall, organized into 7 departments and 25 development teams (sections), each comprising 10 to 20 members based on products and roles.

【Business Overview】
Rakus uses cloud and IT technologies to improve efficiency and address societal challenges like labor and time shortages. The Rakrak Series, one of its flagship products, focuses on supporting back-office operations (e.g., accounting, HR, and sales admin).

▼Key Features
Multiple SaaS offerings strengthen product utility for a broad range of users. One example of our products focuses on improving back-office operations for mid-sized companies. Rather than offering customizations for specific clients, we aim to create widely applicable products. We strive to address the pain points of many customers by expanding our efforts in this area and equipping each product with functionalities and usability that are highly effective, even when used independently.
Many of Rakus's executives have engineering backgrounds and regard product development as a key pillar of our business strategy.

▼ Service Examples
'楽楽精算 (Rakuraku Seisan)'
Japan's No. 1 cloud-based expense management system with over 15,000 companies using it. It streamlines expense processing for businesses of all sizes and industries.

'楽楽明細 (Rakuraku Meisai)'
An electronic invoice issuance system that allows invoices, delivery notes, payment statements, and other forms to be issued online. It eliminates the time-consuming tasks of printing, enclosing, and mailing invoices.

Other services include '楽楽販売 (Rakuraku Hanbai)', 'メールディーラー (Mail Dealer)', and '配配メール (Haihai Mail)'.

【Development Culture】
Rakus fosters a cross-functional technical organization that operates independently of business divisions, enabling engineers to thrive in a culture they build themselves.

▼Mission
"Create overwhelmingly user-friendly SaaS to drive customer success."
▼Vision
"Become Japan's leading SaaS engineering team."
● Recognized as the leading experts in SaaS development by engineers across Japan.
● Working with confidence and pride as the No. 1 team of technical professionals.

▼ About Us
◯ Our Core Values
Striking a balance between growing existing services and taking on new business challenges.
Focusing on thorough PDCA cycles to drive business growth.
Tackling essential matters to achieve growth for both the company and ourselves.
◯ Our Challenges
Collaborating with business units (Sales, Planning, Customer Success, etc.) to determine how to meet market needs and seize opportunities.
Building a team that prioritizes people and work equally, as both products and employees are in the process of growth.
Integrating and coexisting with new functionalities and innovative technologies that have yet to exist in the market.
Continuously improving development and operations by collecting feedback from customers post-release.
◯ Who Thrives Here
People who enjoy growth and are eager to learn with a strong sense of initiative and hospitality to create services together.
Individuals who have moved away from passive development mindsets to actively engage in service development.
Team members who approach their work with both business and technical perspectives, taking ownership as if it were their own business.
Professionals who aim for continuous improvement by building knowledge and systems step by step, focusing on overall optimization rather than one-off solutions.

Required Skills and Experiences

[Requirements] (1) At least 2 years of experience in system development (AI or web-related fields, or otherwise). (2) Programming experience with Python. (3) Experience in at least one of the following: (3-1) Practical experience in machine learning projects. (3-2) Development experience using machine learning libraries such as TensorFlow, Keras, or Pytorch. [Preferred Qualifications] ・Academic research in the field of machine learning. ・Experience in developing and operating web services. ・Experience in end-to-end machine learning development, from requirements definition to release. ・Development experience in fields such as image recognition or natural language processing.

After sign up, you can browse all information.

If you already have a GitTap Account, please login.

Working Condition

【Salary】
■ Annual Salary: ¥5,493,636 – ¥9,661,116
Example: For an annual salary of ¥5,493,636
Monthly pay: ¥344,563 (Base salary: ¥268,000 + overtime allowance: ¥46,563 + other allowances: ¥30,000)
*Overtime allowance includes 20 hours per month, regardless of actual overtime hours.
*No changes in conditions during the 6-month probationary period.

■ Allowances:
－Family allowance (¥30,000/month for one dependent, ¥50,000/month for two, ¥60,000/month for three or more)
－Overtime allowance
－Night shift allowance
－Holiday work allowance
－Commuting allowance
－Assignment allowance
－Business trip allowance

【Work Location】
151-0053, 2-1-1 Yoyogi, Shibuya-ku, Tokyo, SHINJUKU MAYNDS TOWER

【Working Hours】
9:00 AM – 6:00 PM

【Salary Increase】
Once annually (May)

【Bonus】
Twice annually (June, December) *Excludes managerial positions (salary-based).

【Benefits】
● Full Social Insurance Coverage
Health insurance (Kanto IT Software Health Insurance Association), Employment Insurance, Pension, Workers' Compensation Insurance
● Transportation Allowance
Up to ¥100,000/month
● Family Allowance
¥30,000/month for one child, ¥50,000/month for two children, ¥60,000/month for three or more children (up to 18 years old). *Not available for assistant managers and managers.
● Casual Dress Code
● Flexible Shift System
Allows daily or monthly adjustments in 30-minute increments, within one hour before or after standard working hours.
Example: 8:00 AM – 5:00 PM, 8:30 AM – 5:30 PM, 9:30 AM – 6:30 PM, 10:00 AM – 7:00 PM
● "LaxSmile" Program
Allows flexibility in working hours and evaluation style during childcare periods. (Available after one year of employment)
● Shortened Work Hours for Childcare and Caregiving
● Additional Support for Employees
Babysitter subsidy program
In-house clubs (baseball, futsal, music, crafts, etc.)
In-house events
Office café (free coffee, tea, light snacks, and water dispensers)
Book lending system
Regular tier-based training (for managers, leaders, new employees, etc.)

【Holidays and Leave】
・Complete two-day weekends (Saturday, Sunday)
・Public holidays
・New Year’s holidays
・Summer vacation
・Paid leave
　Paid leave utilization rate: over 90% (FY2024)
・Maternity leave (pre- and post-birth)
　100% return rate after leave
・Childcare leave
　Five days per year per child
・Bereavement leave
　Seven days for marriage, condolence leave, paternity leave, etc.
・Sick leave
　Five days per year (separate from regular paid leave)
・Hourly leave
　Five days per year, available in increments of one hour (up to 40 hours)
・Special leave
・Menstrual leave
・Maternity health leave
・Backup leave
　Unused paid leave can be carried over for up to five days annually, accumulating to a maximum of 20 days (specific conditions apply).

Smoking Policy: Indoor smoking prohibited.

RECRUITMENT PROCESS

document screening
　▼
First Interview
　▼
Final Screening / Aptitude Test 
　▼
Offer of employment

*In principle, applicants are required to take an aptitude test before the final interview, but the selection process may change depending on the position.

Business (description what they do)

We offer several cloud services to support back-office operations such as expense reimbursement and sales management, as well as front-office operations such as responding to customer inquiries and marketing.

Available Jobs in (RAKUS Co., Ltd.)

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Top-Selling Points

Rate of Foreigners

Less Than

Frequency of English Usage

Less Than

Remote work Flex-time High utilization rate of paid leaves Plans for overseas expansion In-house product development No dispatch

Top-Selling Points

Rate of Foreigners
Less Than

Frequency of English Usage
Less Than

Remote work Flex-time High utilization rate of paid leaves Plans for overseas expansion In-house product development No dispatch

Related Skills

Programming Language

Java

Language Requirements

Required

Preferred

Language Requirements

Required

Japanese: Native

English: Greetings/None

Preferred

No Data

Job Description

【Hiring Background】
At Rakus, we have an AI/Machine Learning development team that has been working on projects such as our in-house AI-OCR system. To further enhance the AI-powered features in our services, we are strengthening the structure of this development team.
Note: This is not solely a research and development team but one dedicated to developing AI systems specifically for use in our services.
*The team is still relatively new and currently small, but we plan to expand it to a structure of 7-8 members.


【Job Description】
●Develop cutting-edge AI engines and models from scratch to add significant value to our services.
●Oversee the entire process of designing, developing, and releasing features that incorporate advanced AI technologies to enhance our services.

▼ Team Members' Backgrounds:
●One team member has served as a tech lead at several AI startups, working on diverse projects involving image, natural language, and numerical data. With experience ranging from model creation to system integration, they have a proven track record of implementing AI solutions.
Joined Rakus in 2021 as the first AI engineer and has been dedicated to enhancing customer value through AI implementation.

【Development Environment】
Programming Languages: Python, Go, Java, etc.
Frameworks and Libraries: TensorFlow, Keras, PyTorch, etc.
Development Environment: Mac, Linux, Windows, AWS, GCP
Code Review: Pull Request-based (using GitLab Merge Requests)
Version Control System: GitLab
Ticket Management System: GitLab

【Challenges to Tackle】
You will primarily work on developing features that assist with input and data creation for our services. This includes not only implementing machine learning models and algorithms but also integrating them into actual systems (e.g., API implementation) as part of AI system development.
The development will mainly focus on areas such as image recognition, natural language processing, and data analysis.

【Attractions】
⒈ As a relatively new development team, you will have the opportunity to play a pivotal role as a core member in shaping its future.
⒉ Collaborate with AI specialists with extensive experience to drive both projects and organizational growth.
⒊ Engage in end-to-end development of machine learning engines and models, including selecting development environments, libraries, and algorithms.
⒋ Enjoy a collaborative environment fostering a culture of "creating great solutions together."
⒌ With most executives (4 out of 6) having engineering backgrounds, it is an environment where engineers' opinions are well-understood and valued.

【Team Structure】
Manager (Male, 50s)
2 team members
*The company has approximately 250 engineers overall, organized into 7 departments and 25 development teams (sections), each comprising 10 to 20 members based on products and roles.

【Business Overview】
Rakus uses cloud and IT technologies to improve efficiency and address societal challenges like labor and time shortages. The Rakrak Series, one of its flagship products, focuses on supporting back-office operations (e.g., accounting, HR, and sales admin).

▼Key Features
Multiple SaaS offerings strengthen product utility for a broad range of users. One example of our products focuses on improving back-office operations for mid-sized companies. Rather than offering customizations for specific clients, we aim to create widely applicable products. We strive to address the pain points of many customers by expanding our efforts in this area and equipping each product with functionalities and usability that are highly effective, even when used independently.
Many of Rakus's executives have engineering backgrounds and regard product development as a key pillar of our business strategy.

▼ Service Examples
'楽楽精算 (Rakuraku Seisan)'
Japan's No. 1 cloud-based expense management system with over 15,000 companies using it. It streamlines expense processing for businesses of all sizes and industries.

'楽楽明細 (Rakuraku Meisai)'
An electronic invoice issuance system that allows invoices, delivery notes, payment statements, and other forms to be issued online. It eliminates the time-consuming tasks of printing, enclosing, and mailing invoices.

Other services include '楽楽販売 (Rakuraku Hanbai)', 'メールディーラー (Mail Dealer)', and '配配メール (Haihai Mail)'.

【Development Culture】
Rakus fosters a cross-functional technical organization that operates independently of business divisions, enabling engineers to thrive in a culture they build themselves.

▼Mission
"Create overwhelmingly user-friendly SaaS to drive customer success."
▼Vision
"Become Japan's leading SaaS engineering team."
● Recognized as the leading experts in SaaS development by engineers across Japan.
● Working with confidence and pride as the No. 1 team of technical professionals.

▼ About Us
◯ Our Core Values
Striking a balance between growing existing services and taking on new business challenges.
Focusing on thorough PDCA cycles to drive business growth.
Tackling essential matters to achieve growth for both the company and ourselves.
◯ Our Challenges
Collaborating with business units (Sales, Planning, Customer Success, etc.) to determine how to meet market needs and seize opportunities.
Building a team that prioritizes people and work equally, as both products and employees are in the process of growth.
Integrating and coexisting with new functionalities and innovative technologies that have yet to exist in the market.
Continuously improving development and operations by collecting feedback from customers post-release.
◯ Who Thrives Here
People who enjoy growth and are eager to learn with a strong sense of initiative and hospitality to create services together.
Individuals who have moved away from passive development mindsets to actively engage in service development.
Team members who approach their work with both business and technical perspectives, taking ownership as if it were their own business.
Professionals who aim for continuous improvement by building knowledge and systems step by step, focusing on overall optimization rather than one-off solutions.

Required Skills and Experiences

After sign up, you can browse all information.

If you already have a GitTap Account, please login.

Working Condition

【Salary】
■ Annual Salary: ¥5,493,636 – ¥9,661,116
Example: For an annual salary of ¥5,493,636
Monthly pay: ¥344,563 (Base salary: ¥268,000 + overtime allowance: ¥46,563 + other allowances: ¥30,000)
*Overtime allowance includes 20 hours per month, regardless of actual overtime hours.
*No changes in conditions during the 6-month probationary period.

■ Allowances:
－Family allowance (¥30,000/month for one dependent, ¥50,000/month for two, ¥60,000/month for three or more)
－Overtime allowance
－Night shift allowance
－Holiday work allowance
－Commuting allowance
－Assignment allowance
－Business trip allowance

【Work Location】
151-0053, 2-1-1 Yoyogi, Shibuya-ku, Tokyo, SHINJUKU MAYNDS TOWER

【Working Hours】
9:00 AM – 6:00 PM

【Salary Increase】
Once annually (May)

【Bonus】
Twice annually (June, December) *Excludes managerial positions (salary-based).

【Benefits】
● Full Social Insurance Coverage
Health insurance (Kanto IT Software Health Insurance Association), Employment Insurance, Pension, Workers' Compensation Insurance
● Transportation Allowance
Up to ¥100,000/month
● Family Allowance
¥30,000/month for one child, ¥50,000/month for two children, ¥60,000/month for three or more children (up to 18 years old). *Not available for assistant managers and managers.
● Casual Dress Code
● Flexible Shift System
Allows daily or monthly adjustments in 30-minute increments, within one hour before or after standard working hours.
Example: 8:00 AM – 5:00 PM, 8:30 AM – 5:30 PM, 9:30 AM – 6:30 PM, 10:00 AM – 7:00 PM
● "LaxSmile" Program
Allows flexibility in working hours and evaluation style during childcare periods. (Available after one year of employment)
● Shortened Work Hours for Childcare and Caregiving
● Additional Support for Employees
Babysitter subsidy program
In-house clubs (baseball, futsal, music, crafts, etc.)
In-house events
Office café (free coffee, tea, light snacks, and water dispensers)
Book lending system
Regular tier-based training (for managers, leaders, new employees, etc.)

【Holidays and Leave】
・Complete two-day weekends (Saturday, Sunday)
・Public holidays
・New Year’s holidays
・Summer vacation
・Paid leave
　Paid leave utilization rate: over 90% (FY2024)
・Maternity leave (pre- and post-birth)
　100% return rate after leave
・Childcare leave
　Five days per year per child
・Bereavement leave
　Seven days for marriage, condolence leave, paternity leave, etc.
・Sick leave
　Five days per year (separate from regular paid leave)
・Hourly leave
　Five days per year, available in increments of one hour (up to 40 hours)
・Special leave
・Menstrual leave
・Maternity health leave
・Backup leave
　Unused paid leave can be carried over for up to five days annually, accumulating to a maximum of 20 days (specific conditions apply).

Smoking Policy: Indoor smoking prohibited.

RECRUITMENT PROCESS

document screening
　▼
First Interview
　▼
Final Screening / Aptitude Test 
　▼
Offer of employment

*In principle, applicants are required to take an aptitude test before the final interview, but the selection process may change depending on the position.

Business (description what they do)

Available Jobs in (RAKUS Co., Ltd.)

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