Kozocom is on a mission to solve corporate issues and create social value through our business.

Responsibilities

• Design, develop, and maintain backend applications using PHP (Laravel) and Node.js.
• Build scalable, secure, and maintainable RESTful APIs/backend services following clean architecture principles.
• Participate in migrating and modernizing legacy systems to modern architectures using PHP (Laravel) and Node.js.
• Design database structures and optimize SQL queries for performance and scalability.
• Integrate third-party APIs and cloud services.
• Troubleshoot and debug production issues, optimize system performance based on monitoring metrics, and continuously improve system reliability and stability.
• Participate in architecture discussions and technical decision-making.
• Write technical documentation, maintain development standards, and mentor junior developers.
• Write unit/integration tests, participate in code reviews, and ensure code quality and best practices.
• Utilize AI-assisted development tools to improve software quality, development efficiency, and engineering productivity.
• Design, build, and maintain AI Agent Skills, prompts, workflows, and reusable engineering knowledge for development teams.
• Continuously explore and adopt emerging technologies, AI-Driven Development practices, and AI-powered tools for coding, testing, debugging, and documentation to improve software quality and engineering productivity.

Qualifications

• 3+ years of backend development experience.
• Strong proficiency in PHP.
• Experience with Laravel or similar PHP frameworks.
• Good knowledge of Node.js (NestJS).
• Strong SQL knowledge.
• Experience with MySQL, PostgreSQL, or MariaDB.
• Database design and performance optimization.
• Strong understanding of: OOP, SOLID Principles, Design Patterns, Clean Code, Clean Architecture
• Experience building scalable backend systems.
• Experience writing Unit Tests, Integration Tests, and API Tests to ensure code quality.
• Experience using AI coding assistants such as GitHub Copilot, Cursor, Claude Code, Gemini CLI, or similar AI development tools.
• Ability to create, customize, and maintain AI Agent Skills, prompts, or AI workflows to improve development productivity.
• Experience with Redis, Caching, Queue/Job (Redis, SQS, RabbitMQ), Webhooks, WebSocket (pub/sub), and knowledge of NoSQL (MongoDB/DynamoDB is a plus).
• Knowledge of Docker, Linux, Nginx, basic CI/CD, observability/logging.
• Ability to read and understand technical documentation in English.
• Preference for candidates with an ownership mindset, proactive problem-solving attitude, and strong technical communication.

Preferred Qualifications

• Cloud & DevOps: AWS (EC2, RDS, S3, Lambda, ECS, CloudFront, DynamoDB, CloudWatch, VPC, ELB)
• Microservices, Event-driven architecture
• Experience working with Japanese clients.
• Experience integrating LLMs, MCP, AI Agents, or Agentic AI into software products or engineering workflows.
• GCP: Cloud Storage, Vertex, BigQuery, Cloud Run
• Ability to review architecture and standardize the codebase.
• Experience in project planning, task estimation, team coordination, and software project management is a plus.

Soft Skills

• Strong analytical and problem-solving skills.
• Good communication and teamwork.
• Ability to learn new technologies quickly.
• Ownership mindset with strong responsibility.
• Proactive attitude toward continuous improvement.
• Ability to mentor junior developers (Senior level).

Working Time

• From Monday to Friday: 8:00 AM – 12:00 PM | 1:00 PM – 5:00 PM 

Interview Process

• Round 1: Technical Interview
• Round 2: Final Interview

Why You’ll Love Working Here

• Compensation & Benefits
  • Competitive salary & salary reviews twice a year
  • 13th-month salary
  • 19 days of paid leave per year
• Health & Well-being
  • Premium healthcare insurance for employees and eligible family members
  • Annual health check-up
• Learning & Career Growth
  • Sponsored professional certifications and training programs
  • English courses to support continuous learning
  • Clear career roadmap and growth opportunities
  • Onsite Opportunities: work with international teams and Japanese clients
• Work Environment & Culture
  • 40-hour work week (Monday – Friday)
  • Flexible hybrid working policy
  • Happy, inclusive, and open-minded working culture
  • Working equipment (MacBook/ThinkPad, depending on project requirements)
  • Long-service recognition program after 5-year milestones
  • Free snacks, coffee and beverages in the pantry
  • Annual company trip and team-building activities
  • Sports clubs and internal activities (Football, Badminton, etc.)

To apply, please send your CV to: kzvn-hr@kozo-japan.com