Senior Software Engineer (Full Remote)

Senior Software Engineer (ML Services & Platform)

Location: Tokyo

Salary: ¥6,000,000 to ¥12,000,000

Employment Type: Full-time

Remote: Fully Remote

Japanese Level: Not required

Job ID: 06521

About the Company

A fast-growing AI SaaS company transforming sales and customer communication through AI, voice technology, and cloud infrastructure. Founded in 2017 and headquartered in Shibuya, Tokyo, the company has grown to approximately 210 members and operates with a fully remote and flexible work environment.

The company provides AI-powered IP phone systems and real-time online meeting analysis tools

that quantify and improve sales communication. With over 10,000 client companies and more than 250 million accumulated voice recordings, the platform achieved No.1 domestic market share in cloud-based conversational AI solutions in 2021 and ranked No.1 in the 2022 Deloitte Technology Fast 50 Japan with 486.7% three-year growth.

Compared to global competitors such as Dialpad and Aircall, the company holds a strong

competitive edge in Japanese language processing and localized workflow optimization. All core technologies, including speech recognition with over 90% accuracy, are developed in-house, enabling rapid iteration and continuous innovation.

Job Overview

This role focuses on designing and scaling multimodal AI systems centered on voice technologies. You will work on large-scale distributed systems, real-time processing infrastructure, and advanced MLOps pipelines to support continuous model improvement and global expansion.

Responsibilities

• Lead architecture design and implementation for large-scale distributed systems, ensuring reliability and scalability

• Build cost-efficient, cloud-native infrastructure

• Design and implement advanced MLOps pipelines for continuous model deployment

• Develop real-time data processing and analytics platforms

• Collaborate with AI research teams to prototype and productize next-generation features

• Design high-availability, low-latency architectures for global expansion

Tech Environment

• Backend: Python, Django, Elasticsearch

• Frontend: React.js, Vue.js

• Data & ML: Python, TensorFlow, Keras, PyTorch

• Communication: SIP, VoIP, WebRTC, WebSocket

• Infrastructure: AWS, Google Cloud, Terraform

• Mobile: Kotlin, Swift, Flutter

• Tools: Slack, GitHub, Confluence

• Real-time processing: Amazon Kinesis

Requirements

Must Have

• 3+ years of experience developing distributed systems on AWS

• Strong hands-on experience with Kubernetes and container orchestration

• Experience designing and implementing CI/CD pipelines

• Advanced programming skills in Python or similar languagesPython or similar lan

• Experience in performance tuning and cost optimization for large-scale systems

Nice to Have

• Experience designing ML systems

• Speech processing or NLP experience

• Multimodal AI application development

• Microservices architecture design

• Serverless architecture experience

• Experience with Apache Spark or Kafka

• Cloud-native application development

• Open-source contributions

• Conversational-level English or higher

Benefits & Conditions

• Annual Salary: ¥6M to ¥12M

• Fully remote work environment

• Flexible working style

• Transportation covered according to company policy

• Holidays: Saturdays, Sundays, national holidays, summer holidays, year-end and New Year holidays, special leave

• Full social insurance coverage