Senior Software Engineer ◆Remote /Super-Flex /Multicultural

Why LiNKX?

• Engineering-First Culture – Collaborate with top engineers using modern tech stacks
• Meaningful Work – Contribute to secure, high-impact financial systems
• Truly Global Team – Work in an international and inclusive environment
• Continuous Learning – Grow your skills and shape the future of FinTech 

About LiNKX

LiNKX Inc. is a unique, engineering-first tech company based in Tokyo, where over 80% of our team are software engineers—many of whom come from international backgrounds.

Our mission is to modernize mission-critical systems with global innovation and Japanese engineering precision. We have achieved rapid growth, driven by our three core pillars:

1. FinTech Solutions
2. PharmaTech In-House Product – "Lab Hub"
3. SocialTech In-House Product – "shikAI"

Why We’re Hiring

As our core FinTech solution business continues to expand, we are looking for Senior Software Engineers to help lead the development and modernization of our clients’ financial digital products.

In this growing division, we provide high-quality solutions in areas such as:

• Core Banking System Development
• FinTech Service Development (including mobile apps, APIs, etc.)
• In-house System Development & Consulting

■Learn more about our FinTech business:
https://www.linkx.dev/fintech

Key Responsibilities

As a Senior Software Engineer in the FinTech division, you will be responsible for the following:

• Collaborating with the development team to design software solutions
• Selecting technologies such as frameworks and programming languages
• Passing on knowledge of selected technologies and the architecture built
• Supporting product development and implementing in-house solutions
• Developing and managing high-performance systems, databases, and applications
• Creating high-level APIs and writing clean, maintainable code
• Testing, troubleshooting, debugging, and upgrading software
• Understanding and applying best practices for security and data protection
• Creating technical documentation

Project Examples

• Modernization of banking accounting systems (Technologies: Azure/GCP multi-cloud, Java/Kotlin, Spring)
• Building BaaS APIs: Enabling the expansion of embedded finance (Technologies: GCP, Java/Kotlin, Spring)
• E-money system: Building a large-scale transaction processing system from scratch for major retailers (Technologies: GCP, Go, Java/Spring)
• New online-based financial services for a major financial institution (Technologies: Azure, C#/.Net Core, ASP.NET, TypeScript/Vue.js)

Tech Stack

• Languages: Java, Kotlin, JavaScript, TypeScript, Go, C#, etc.
• Frameworks: Spring, Vue.js, Nuxt.js, .NET Framework, etc.
• Cloud: AWS, GCP, Azure

Team Structure
You’ll work in small project teams of 5–8 members, including client-side developers, using an agile development approach based on Scrum.

Requirements

Must-Have:

1. Experience with at least one of the following frameworks or languages:
   ・Spring (Java or Kotlin)
   ・Vue.js or Nuxt.js or Quasar
   ・Go
   ・C# .NET, ASP .NET

2. Over 10 years of experience as a software engineer or in a similar role.

3. Cloud infrastructure experience (AWS, GCP, or Azure)

Nice-to-Have:

• Leadership skills
• Experience with Agile development style
• Experience with projects using microservices or event-driven architecture
• Japanese proficiency at conversational level (N3 or above)

Interview Process

1st: Interview (Online)
2nd: Interview (Skill Test Online)
Final: Interview (Face-to-face at our office)