IT / Web DevelopmentMid-career
IT / Web Development × Mid-career
With 5 years of experience in web development, I have specialized in backend development and infrastructure for B2B SaaS and B2C matching apps. By leveraging Go and AWS, I led a microservices migration that reduced API response times by 40%. My strengths include scalable architecture design and tech leadership in agile environments. I am ready to contribute to global product development in both Japanese and foreign companies.
📌 Career Summary
- ▸April 2018 - March 2021: Backend Developer at Technovate Inc. (B2B SaaS company), developing a time and attendance management system using Ruby on Rails. Responsible for feature development and API design.
- ▸April 2021 - Present: Tech Lead at Global Web Services Inc. (B2C matching app), driving the migration from Ruby on Rails to Go and the adoption of microservices. Managing a team of 3 developers.
📌 Achievements & Strengths
- ▸Led the gradual migration of a monolithic Rails application to Go-based microservices, reducing average API response time from 400ms to 240ms—a 40% improvement.
- ▸Optimized infrastructure costs by introducing and tuning AWS ECS Fargate and Spot Instances, reducing monthly infrastructure expenses from ¥1.2M to ¥850K—a 30% reduction.
- ▸Enhanced development productivity by implementing CI/CD pipelines with GitHub Actions and test automation, increasing deployment frequency from once a week to three times a day and cutting lead time by 60%.
📌 Skills
- ▸Backend: Go, Ruby on Rails, Python, SQL (PostgreSQL, MySQL)
- ▸Frontend: React, TypeScript, Next.js (capable of API integration and basic UI modifications)
- ▸Infrastructure/DevOps: AWS (ECS, Lambda, RDS, S3), Docker, Kubernetes, Terraform, GitHub Actions
- ▸Other: Microservices architecture design, Agile/Scrum development, Tech leadership, English technical document reading and conversational communication (TOEIC 780)
📌 Self-PR
- ▸Driven by problem-solving and technical decision-making to enhance product value: At my previous company, I identified database lock contention as a bottleneck during user growth. I proposed and implemented the CQRS pattern with Redis, reducing timeout errors by 99% during peak times. While addressing technical debt, I ensured stable operation for a service with 50K DAU. My strength lies in always considering the 'why' behind technology choices from a business perspective and leading teams effectively.
💡 Key Tips
- 💡Tailor your resume for Japanese companies by emphasizing teamwork, stability, and improvement processes, while for foreign companies, highlight individual output, scalability, and English proficiency.
- 💡Be ready to explain in interviews how you measured achievements (e.g., 40% reduction, 30% cost cut) and what alternatives you compared against.
- 💡Beyond listing technologies, articulate your architectural design thinking, including why you chose certain technologies and how you evaluated trade-offs.
- 💡If targeting foreign IT companies, create a separate English CV and ensure your LinkedIn profile is fully updated in English.
🔗 🔗 Other levels
Last reviewed: 2026-09-06 · aijobs Editorial