RAKUS Co., Ltd.

【Server Side Engineer / Java】Tokyo｜Hybrid work｜SaaS solutions adopted by 15,000+ companies

Backend Engineer

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

【Job Description】
Developing web applications for SaaS products in the "Rakrak Series" (e.g., Rakrak Seisan and Rakrak Meisai), including adding new features, improving performance, and making technical enhancements or overhauls.

▼Examples of Tasks
⒈　Feature Development
Managing the entire process: requirements definition, design, development, testing, and release.
Deliverable Creation and Review

⒉　Creating and reviewing documents like specifications and design documentation.
Conducting code reviews.
Support Team Inquiries

⒊　Handling inquiries and work requests from support teams.
Troubleshooting and investigating issues.
Team Member Support

⒋　Supporting team members in both technical and behavioral aspects.

【Development Environment】
Combination of:
Programming Languages: Java, JavaScript
Middleware: Apache, Tomcat
Frameworks/Libraries: Spring Boot, SAStruts, jQuery, React/Redux, Vue.js
Databases: PostgreSQL
IDE: Eclipse, IntelliJ
Code Review: Pull Request-based code reviews using GitLab Merge Requests
Methodologies: Agile, Waterfall
Version Control: GitLab
Ticketing Tools: Redmine, Trello
CI/Testing: GitLab CI, Jenkins, Gradle, Selenium/Selenide
Other Tools: Flyway, Docker, GitHub Copilot
Hardware: Laptop (choice of Windows or Mac), dual wide monitors provided

【Development Structure】
Team size: 5–10 members per service
Team roles include: management positions, technical specialists, and developers.

▼Example Roles
Project Manager
Product Manager
Tech Lead (Technical Specialist)
Backend Engineer
Frontend Engineer
Teams collaborate with other departments, such as designers, infrastructure engineers, product marketing managers, and customer support. Roles are divided into:
Management roles: PM/PdM tasks (progress management, resource allocation, team development, improvement activities).
Specialist roles: Technical leadership, training, and innovation.

【Hiring Background】
Both new and existing services in the 楽楽(Rakuraku) Series are rapidly scaling, with a growing user base and societal impact. For example, Rakus has seen annual revenue growth of 30% in recent years, reflecting high market expectations.

The development team, currently 200 members, is expected to double, requiring engineers for various roles like development, tech leadership, and management. Rakus provides an environment where employees can grow and excel across multiple positions.

【Feedback from New Hires】
● "I can nurture the product and feel a sense of attachment to features I’ve built."
● "Involvement in every stage, from feature selection to deployment, has broadened my perspective."
● "I can work on tasks I enjoy, spanning upstream to downstream processes."
● "My Java development experience from an SIer background has proven valuable in SaaS development here."
● "I am surrounded by supportive colleagues eager to tackle challenges together."
● "We maintain a balance between quality and efficiency, avoiding unnecessary efforts."
● "I can voice my ideas and challenge roles I haven’t taken on before."
● "The 'Rakus Leadership Principles' emphasize growth and valuing people."


【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

●Experience in developing web applications using Java and RDB ●Experience in reviewing requirements/specifications, designs, and code

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.)

Recommended Jobs

Ingate Co., Ltd.

【システムエンジニア】フルリモート案件多数／Java,C#,Python,Ruby／平均残業15h◎

3.5M - ***M JPY | Tokyo

Java

DPT Inc.

[Embedded software development SE/PG]Foreign members are actively involved

4M - ***M JPY | Aichi(+25)

C C# C++

AUCNET INC.

[Potential Leader/Partially Remote Work] Back-end engineer/Auction platform

5.5M - ***M JPY | Tokyo

Java Python PHP

FUSIONIA Inc.

【Tokyo】System Engineer｜Flexible Project Selection｜80% Remote｜Java,PHP,C#｜90% Join with Higher Salary

4M - ***M JPY | Tokyo

C# PHP Java

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

【Job Description】
Developing web applications for SaaS products in the "Rakrak Series" (e.g., Rakrak Seisan and Rakrak Meisai), including adding new features, improving performance, and making technical enhancements or overhauls.

▼Examples of Tasks
⒈　Feature Development
Managing the entire process: requirements definition, design, development, testing, and release.
Deliverable Creation and Review

⒉　Creating and reviewing documents like specifications and design documentation.
Conducting code reviews.
Support Team Inquiries

⒊　Handling inquiries and work requests from support teams.
Troubleshooting and investigating issues.
Team Member Support

⒋　Supporting team members in both technical and behavioral aspects.

【Development Environment】
Combination of:
Programming Languages: Java, JavaScript
Middleware: Apache, Tomcat
Frameworks/Libraries: Spring Boot, SAStruts, jQuery, React/Redux, Vue.js
Databases: PostgreSQL
IDE: Eclipse, IntelliJ
Code Review: Pull Request-based code reviews using GitLab Merge Requests
Methodologies: Agile, Waterfall
Version Control: GitLab
Ticketing Tools: Redmine, Trello
CI/Testing: GitLab CI, Jenkins, Gradle, Selenium/Selenide
Other Tools: Flyway, Docker, GitHub Copilot
Hardware: Laptop (choice of Windows or Mac), dual wide monitors provided

【Development Structure】
Team size: 5–10 members per service
Team roles include: management positions, technical specialists, and developers.

▼Example Roles
Project Manager
Product Manager
Tech Lead (Technical Specialist)
Backend Engineer
Frontend Engineer
Teams collaborate with other departments, such as designers, infrastructure engineers, product marketing managers, and customer support. Roles are divided into:
Management roles: PM/PdM tasks (progress management, resource allocation, team development, improvement activities).
Specialist roles: Technical leadership, training, and innovation.

【Hiring Background】
Both new and existing services in the 楽楽(Rakuraku) Series are rapidly scaling, with a growing user base and societal impact. For example, Rakus has seen annual revenue growth of 30% in recent years, reflecting high market expectations.

The development team, currently 200 members, is expected to double, requiring engineers for various roles like development, tech leadership, and management. Rakus provides an environment where employees can grow and excel across multiple positions.

【Feedback from New Hires】
● "I can nurture the product and feel a sense of attachment to features I’ve built."
● "Involvement in every stage, from feature selection to deployment, has broadened my perspective."
● "I can work on tasks I enjoy, spanning upstream to downstream processes."
● "My Java development experience from an SIer background has proven valuable in SaaS development here."
● "I am surrounded by supportive colleagues eager to tackle challenges together."
● "We maintain a balance between quality and efficiency, avoiding unnecessary efforts."
● "I can voice my ideas and challenge roles I haven’t taken on before."
● "The 'Rakus Leadership Principles' emphasize growth and valuing people."


【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

●Experience in developing web applications using Java and RDB ●Experience in reviewing requirements/specifications, designs, and code

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.)

Recommended Jobs

la-haina Co., Ltd.

[Full Stack Engineer] JavaScript, Java, Python, etc. / Work from Home / Multinational environment

3M - ***M JPY | Tokyo

JavaScript Java Python

iDEA Consulting Inc.

BI Application Engineer【Full-Flextime & Full-Remote Work/Enriched Training/Prime Vendor】

4M - ***M JPY | Tokyo

System design (detail) System Design (Fundamental) Python

G Talent

Project Manager (Next-Generation Financial Systems Business)

8M - ***M JPY | Tokyo

C C++ Go

SOFT HYPERION Co.,Ltd.

【System Engineer】No-Experience Needed／Skill Growth Support／Diverse Projects in Finance, Retail & etc

3M - ***M JPY | Tokyo

C# PHP Java