Seirai Technologies is your partner that leverages the power of IT to help you solve business problems and grow.
❇️ In short ✌️ Full-time 💻 Server-side Engineer 💴 ¥6,860,000 - ¥10,696,000 🗼 Company location - Tokyo, Japan 🌍 Japanese speaking environment ❇️ About the Role Lead server-side application development, operation, and infrastructure management for a sports betting service. Maximize product value and lead projects while gaining experience with largescale infrastructure development and operations in a niche market with significant growth potential. ❇️ Key Responsibilities Service design and business flow architecture Server-side application development (architecture design, new feature development) Infrastructure construction and operation using Google Cloud and AWS Building scalable systems that handle high loads Cross-functional communication and technical leadership Long-term technical support and R&D for future market requirements ❇️ Essential Skills Server-side application development experience using cloud services Experience building scalable systems that handle high loads Cloud architecture design and database design experience Infrastructure design, development, and operation experience ❇️ Preferred Skills Server-side application development experience using Go Development experience with NewSQL databases Experience leading projects or teams as a lead engineer Micro-services architecture design, development, and operation experience Development experience using Kubernetes Development experience with payment processing services ❇️ Technology Stack Backend: Go Cloud/Infrastructure: Google Cloud (GKE, Cloud Run, Cloud Spanner, Memorystore), AWS(MediaLive, CloudFront, S3) Database: Cloud Spanner, Cloud SQL DevOps/CI-CD: Kubernetes, Helm, Argo CD, Terraform, Bitrise, GitHub Actions, CircleCI, Cloud Build Monitoring: Cloud Monitoring, Managed Service for Prometheus, Firebase, BigQuery, Looker, DataFlow Other Tools: nginx, Spanner Autoscaler, Git, GitHub, JIRA ❇️ Compensation & Benefits Salary Annual Salary: ¥6,860,000 - ¥10,696,000 Monthly Salary: ¥490,000 - ¥764,000 Benefits & Perks Financial Benefits: Housing allowance, employee stock ownership plan, corporate defined contribution pension, transportation expenses Health & Wellness: Health insurance, massage room, flu vaccinations, sick child care & babysitting subsidy Work-Life Balance: Flexible hours (core time 12:00-15:00), remote work system, 123 days off per year Professional Development: Book purchasing support, various training programs, Scrum training Office Perks: In-house cafe, drink bar, convenience store, lunch support Other Benefits: Side job policy, childcare/nursing care leave, refresh vacation & bonus system, social gathering programs
❇️ In short ✌️ Full-Time 📱Mobile App Engineer (Flutter) 💴 ¥6,860,000 - ¥10,696,000 🗼 Company location - Tokyo, Japan 🌍 Japanese speaking environment ❇️ About the Role Develop official mobile apps (iOS/Android) for professional soccer and basketball teams using Flutter cross-platform development. Create attractive products for users and teams while providing technical support for new sports×fan-focused business initiatives. ❇️ Key Responsibilities iOS and Android app planning, design, and implementation (cross-platform development) Architecture design and new feature implementation Code refactoring and review processes UI/UX improvement and optimization Collaboration with internal/external engineers, business staff, and designers On-site product usage analysis and improvement proposals ✳️ Experience required Essential Skills • Flutter app development experience iOS app development experience with willingness to work with Flutter Android app development experience with willingness to work with Flutter 🤘 Preferred Skills Consumer-facing native app development experience Native app new development and release experience Performance-conscious and sustainable development experience Mobile application architecture design experience Agile development (Scrum) orientation Cross-platform development experience 💻 Tech Stack & Skills: Frontend: Flutter (iOS/Android) Backend: Ruby on Rails Go Database: MySQL (Amazon Aurora), Redis Cloud/Infrastructure: AWS, Firebase, Pulumi DevOps/CI-CD: Bitrise, GitHub Actions, Docker Compose, Xcodes Monitoring: AWS, Firebase, Rollbar, AppsFlyer Other Tools: GitHub, Slack, Notion, Figma, Google Workspace ❇️ Benefits & Perks Financial Benefits: Housing allowance, employee stock ownership plan, corporate defined contribution pension, transportation expenses Health & Wellness: Health insurance, massage room, flu vaccinations, sick child care & babysitting subsidy Work-Life Balance: Flexible hours (core time 12:00-15:00), remote work system, 123 days off per year Professional Development: Book purchasing support, various training programs Office Perks: In-house cafe, drink bar, convenience store, lunch support Other Benefits: Side job policy, childcare/nursing care leave, refresh vacation & bonus system, social gathering programs
🌟 In short ✌️ Full-time 💻 Senior Software Architect 🌟 Ruby, Go, Backend frameworks 💴 ¥7,560,000 - ¥12,040,000 🗼 Company location - Tokyo, Japan 🌍 Japanese speaking environment ❇️ About the Role Lead technical strategy formulation and long-term issue identification for key business units within a cross-functional technology organization. As a senior backend engineer, drive software and process improvements for long-running services, solve technical challenges for global expansion, and enhance company-wide technical capabilities. ❇️ Key Responsibilities Middleware and infrastructure improvements for long-running services, backend code modifications Technical constraint investigation, architecture design, and implementation for global expansion Company-wide system documentation and workflow improvements Scalable system design and architecture optimization Technical leadership and initial design for new business ventures and R&D projects Technical knowledge accumulation, deployment, and internal/external technical communication ❇️ Essential Skills 3+ years of experience as an architect or lead engineer Architecture design and technology selection experience Backend development experience using Ruby and Go Analysis and resolution of complex technical issues, scalable system design implementation Infrastructure design and optimization using cloud environments (AWS, GCP) Database design and optimization skills 🤘 Preferred Skills 10+ years of engineering experience Large-scale project leadership experience Internal and external technical communication and event participation/speaking experience Global service technical challenge resolution experience Microservices architecture design and operation experience Technical strategy formulation and organizational technical capability enhancement experience 💻 Tech Stack Backend: Ruby, Go Cloud/Infrastructure: AWS, GCP, On-premise Database: MySQL, PostgreSQL, Various other databases DevOps/CI-CD: Terraform, Ansible, GitHub Actions Monitoring: Infrastructure monitoring, Performance analysis tools Other Tools: GitHub, Slack, Documentation tools ✳️ Benefits & Salary Salary Annual Salary: ¥7,560,000 - ¥12,040,000 Monthly Salary: ¥540,000 - ¥860,000 (Base: ¥411,400 - ¥655,200, Job allowance: ¥128,600 - ¥204,800) Financial Benefits: Housing allowance, employee stock ownership plan, corporate defined contribution pension, transportation expenses Health & Wellness: Health insurance, massage room, flu vaccinations, sick child care & babysitting subsidy Work-Life Balance: Flexible hours (core time 12:00-15:00), remote work system, 123 days off per year Professional Development: Book purchasing support, training programs, technical conference support Office Perks: In-house cafe, drink bar, convenience store, lunch support Other Benefits: Side job policy, childcare/nursing care leave, refresh vacation & bonus system, social gathering programs
🌟 In-Short ✌️ Full-time ☁️ Site Reliability Engineer 🗼 Location – Tokyo, Japan 💴 Salary – ¥8,120,000 - ¥12,040,000 💻 Cloud Infrastructure – AWS, GCP, Azure ❇️ About Role Support the improvement of our focused products and services through technology. As a cross-functional engineering organization, we solve technical challenges across various business phases without focusing on specific business areas. ❇️ Key Responsibilities System architecture design using AWS, Google Cloud, and other platforms API design and development for various services Database and query tuning, performance optimization Security-related work and vulnerability management OS/middleware updates for performance improvement and security CI/CD improvement and automation for efficient development 🤘 Tech Stack & Skills Frontend: TypeScript, CSS, HTML, React, Redux, Next.js, Jest, Webpack, Apollo, Storybook Backend: Ruby, Go, Elixir Database: MySQL (MariaDB), Redis Cloud/Infrastructure: Google Cloud Platform (GCP), Amazon Web Service (AWS), IBM Cloud, On-premise DevOps/CI-CD: GitHub, Chef, Ansible, Terraform, CircleCI, Cloud Build, Github Action, ArgoCD Monitoring: Google Cloud Monitoring, CloudWatch, Elasticsearch, Grafana Other Tools: Memcached, Nginx, fluentd, Swift, Kotlin, Dart ✳️ Experience Required Experience in system design and operation using various cloud infrastructures Practical experience in redundancy, load balancing, monitoring, and troubleshooting Backend development experience for web applications ✳️ Preferred Skills iOS/Android application development experience Basic knowledge of network technologies (HTTP, TCP/IP, etc.) Computer science fundamentals (CPU, memory, algorithms, data structures) Large-scale service development and load balancing experience Middleware tuning experience (Linux, MySQL, Memcached) Experience with managed services like GKE/Fargate ✳️ Compensation & Benefits Salary Annual Salary: ¥8,120,000 - ¥12,040,000 Monthly Salary: ¥580,000 - ¥860,000 (Base: ¥441,880 - ¥655,200, Job allowance: ¥138,120 - ¥204,800) Financial Benefits: Housing allowance, employee stock ownership plan, corporate defined contribution pension Health & Wellness: Health insurance, massage room, flu vaccinations, sick child care & babysitting subsidy Work-Life Balance: Flexible hours (core time 12:00-15:00), remote work system, 123 days off per year Professional Development: Book purchasing support, various training programs Office Perks: In-house cafe, drink bar, convenience store, lunch support Other Benefits: Side job policy, childcare/nursing care leave, club/community systems
🌟 In short ✌️ Full Time 💻 AI/Machine Learning Engineer 💴 ¥8,400,000 - ¥12,460,000 🗼 Company location - Tokyo, Japan 🌍 Japanese speaking environment ❇️ About the Role Support cross-functional business units through machine learning technology verification and implementation. Serve as company-wide AI consultation hub, handling everything from machine learning model development using real data to service deployment and effectiveness measurement, maximizing user value across diverse services. ❇️ Key Responsibilities Development of recommendation features for gaming services Face detection and image analysis features for photo/video services Prediction AI and recommendation features for sports betting services Matching and recommendation features for beauty services Next-generation AI technology research and verification (image, video, audio, text) MLOps implementation and operation (deployment, monitoring, updates) 🤘 Essential Skills Knowledge of machine learning algorithms Development experience using machine learning for feature implementation MLOps implementation experience (deployment, monitoring, updates) Fundamental knowledge of computer science 💻 Technology Stack Programming Languages: Python, Go, Ruby, JavaScript, Swift, Kotlin Cloud/Infrastructure: Google Cloud Platform (GCP), Amazon Web Service (AWS), Microsoft Azure Database: MySQL, PostgreSQL ML Libraries: TensorFlow, Keras, PyTorch, LightGBM, CatBoost DevOps/CI-CD: GitHub, MLOps pipelines Other Tools: EdgeTPU, Slack, Teams ✳️ Preferred Skills (Nice-to-Have) Edge AI and mobile device model inference/deployment experience Specialized knowledge and implementation experience in text, image, audio, tabular data machine learning Academic research achievements and paper publication experience in machine learning Large-scale service AI implementation and operation experience ML pipeline construction experience in cloud environments A/B testing experience for machine learning model effectiveness verification ✳️ Compensation & Benefits Salary Annual Salary: ¥8,400,000 - ¥12,460,000 Monthly Salary: ¥600,000 - ¥890,000 (Base: ¥457,080 - ¥678,040, Job allowance: ¥142,920 - ¥211,960) Financial Benefits: Housing allowance, employee stock ownership plan, corporate defined contribution pension, transportation expenses Health & Wellness: Health insurance, massage room, flu vaccinations, sick child care & babysitting subsidy Work-Life Balance: Flexible hours (core time 12:00-15:00), remote work system, 123 days off per year Professional Development: Book purchasing support, training programs, conference attendance support Office Perks: In-house cafe, drink bar, convenience store, lunch support Other Benefits: Side job policy, childcare/nursing care leave, refresh vacation & bonus system, social gathering programs
