Senior Flutter Engineer (SaaS)

Senior Flutter Engineer

Conditions

Posted Date Jul 09, 2026 Employment Type Full-time Experience Level Associate Location Japan Category ** Mobile ** Company **g talent

Senior Flutter Engineer

★Flutter Engineer | OEM-type SaaS business for employee benefits

• Business Level Japanese Required

◆Flextime & Fully Remote Work◆Start-up Company◆In-house Products◆Annual Salary： 6 million ～ 10 million yen.

-------------【About the company】-------------

The world the company aims for: Products that provide even a little support in a world where each individual's burden is increasing. ──OEM-type Welfare SaaS

Rising prices, tax increases, low wages──in current Japan, the number of people who feel life is "hard" is increasing. The company is challenging itself to lower the cost of living fundamentally by evolving the form of "support from companies to employees" called welfare.

The company provides a welfare app, equipped with discount functions that can be used at over 100,000 stores nationwide, via OEM to HR SaaS companies and financial institutions. This product, which can be deployed under an original brand, supports the creation of new businesses and the expansion of sales to existing customers, while simultaneously creating a virtuous cycle of service improvement through extensive and rapid data collection and its utilization.

The company implements products that shine a light on the "hard work" of working people, reward daily efforts, and provide emotional support.

-------------【 Job Description】-------------

【Business Mission】 In mobile app development centered on Flutter, you will be responsible for the dual roles of improving user experience and strengthening the app foundation. The company expects you to proactively involve yourself not only in the implementation of new functions but also in development looking toward future growth, such as performance improvement, refactoring, and test creation.

Specifically, you will be responsible for consistently engaging in everything from specification consideration to implementation, verification, and operation in collaboration with PdMs, designers, and backend engineers. In function development, the company expects not only meeting requirements but also proposals to realize a better experience for users.

In addition, the company highly evaluates actions that go beyond just completing tasks to autonomously finding issues and leading them to improvements. As a member of the mobile team, the company would like you to challenge yourself with roles such as initiatives to foster the health of the entire repository and raising the development capabilities of the overall team.

【Responsibilities】 ・Flutter application development Interested in remote work opportunities in Mobile? Discover Mobile Remote Jobs featuring exclusive positions from top companies that offer flexible work arrangements. ・Design to implementation of new functions and improvement measures ・Continuous improvements for UI/UX enhancement ・Refactoring for a sustainable system ・Execution of code reviews and tests ・Specification adjustments and requirements definition support with PdMs and designers ・Improvement of development processes, system design looking toward the future, and team building *Range of change: All operations in the company's development field.

Development Tools ・Frontend: Node.js, TypeScript, React ・Package Management: pnpm ・Development Environment: Docker, DevContainer ・Design: Figma, STUDIO ・Code Management: GitHub・Git ・CI/CD: GitHub Actions ・Communication Tools: Slack・Google Meet ・Documentation: OpenAPI ・AI: Devin, Claude Code, ChatGPT, GitHub Copilot

【Members of the team】 The engineer team is composed of members who are proactive about adopting modern development environments, and you will be able to challenge yourself with new things. In particular, as a company policy, development utilizing AI is encouraged, and a system is in place to proactively utilize AI. In addition, as it is a product that has just been launched and is in a phase of creating mechanisms by the team members themselves, it is an environment where many challenges can be taken.

【Attractiveness of the position】 There are many areas still in the process of growth as a mobile app, and you will be able to deeply involve yourself in key technical areas that support the future product, such as performance improvement, architecture review, and enhancement of observability. Also, as you can participate in the process of shaping the overall user experience as a main developer, you can gain a sense that your output directly leads to product value. As a team, the culture of autonomously finding and improving issues is valued. Since it is an environment where new proposals are welcomed and opinions on technology selection and development processes are proactively incorporated, you will be able to directly influence the future of the product. Furthermore, the company is also moving forward with new challenges for future expansion, such as making the app into an SDK, providing an environment where you can take on a wide range of technical challenges while centered on Flutter.

-------------【 Requirements】-------------

Required ・5+ years of practical experience as a mobile app engineer ・Development experience using Flutter Browse our curated collection of remote jobs across all categories and industries, featuring positions from top companies worldwide. ・Business Japanese proficiency

Preferred ・Development experience with Swift or Kotlin ・Experience developing location-based features or map functionality ・Experience building CI/CD pipelines

Ideal Applicants ・Thinking about UX and proactively proposing and creating solutions that are easier for users to use ・Developing with autonomy and responsibility as a professional ・Thinking holistically to optimize the whole rather than just parts ・Strong drive for improvement ・Empathetic to HRT communication

【Working Time 】 Flextime System

【Welfare】 ・Welfare services (subsidies for affiliated restaurants, business supplies, movies, gyms, etc.) ・Provision of Mac Book with desired specifications ・Exchange events with other companies / study sessions ・Provision of various AI tools ・Provision of various software necessary for development

【Holiday】 ・Saturday/Sunday/National Holiday ・Annual Paid Leave ・New Year Holiday

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