Description

Many customers are full of new energy and the new idea. But one of the biggest challenge in building their idea isn't its own idea. It is to find the right engineer who can implement their idea as a real thing. Good execution takes engineer who are technically strong, communicate clearly, deliver on time and understand the importance of the influence. If you need a high skilled engineer, Feel free to contact with me.

Senior Software Engineer 14 years of hands on experience building production systems

from full-stack ownership in early startups, to deep backend engineering on a global platform serving 40 countries, and now designing LLM - powered and agentic Al systems in regulated, data-intensive domains. I specialize in high concurrency, fault-tolerant services that run reliably across multi-region deployments.

Strong grasp of distributed systems, performance tuning, and keeping complex workloads stable under heavy load. I turn difficult technical problems and modeling decisions into production-grade solutions that deliver clear, measurable business value while balancing scale, latency, cost, and long-term maintainability. Comfortable with full ownership in distributed international teams: architecture, implementation, deployment, observability, and

continuous improvement.

Industry field of expertise

Languages

English
Native or bilingual
Japanese
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Federato
SeniorAI Engineer
April 2022 - January 2026 (3 years and 9 months)
United, PA, USA
- Designed and built LLM-powered agentic workflows that automate submission intake, risk triage, full-quote generation, and underwriting decision support — delivering complete, explained quotes for underwriter review in minutes while preventing strategy drift.

- Led creation of comprehensive model evaluation, benchmarking, and production monitoring systems tracking accuracy, latency, drift, coverage, and performance regressions.

- Developed modular ML/LLM architectures to support rapid experimentation and reuse across diverse insurance lines, carriers, and real-world use cases.
Defined core principles and guardrails for safe, interpretable autonomous agent behavior that balances business outcomes, explainability, and regulatory/compliance needs.

- Partnered with MLOps and Data Engineering to deploy, monitor, and continuously improve models in production environments.

- Translated cutting-edge applied research into production AI features directly used by underwriting teams.

- Effectively communicated complex modeling trade-offs, evaluation results, and system impacts to both technical teams and business stakeholders.
AI Automation DevOps Python Test Environment Management External API integration
Delivery Hero
Senior Backend Engineer
November 2019 - April 2022 (2 years and 5 months)
Berlin, Germany
Designed and maintained high-concurrency backend services powering restaurant advertising, premium placements, and performance analytics products handling massive global traffic.

- Built and optimized RESTful APIs consumed by thousands of merchants and internal systems across multiple regions and time zones.

- Developed and supported production services in Python, Scala, and PHP within a largescale microservices architecture.

- Boosted system stability, throughput, and cost-efficiency through database optimizations, legacy code refactoring, and performance tuning.

- Contributed to architecture and implementation of fault-tolerant, highly available systems designed to handle peak traffic reliably.

- Deployed, scaled, and operated services using Docker and Kubernetes on AWS and GCP cloud environments.

- Set up and maintained observability with monitoring, logging, and alerting via Grafana, New Relic, and Kibana to catch issues fast.

- Collaborated daily with product, data, frontend, and cross-functional teams in a fast-paced, international agile setup.
Restful API AWS Python Scala PHP
株式会社Hacobu
Full Stack Developer
September 2014 - November 2019 (5 years and 2 months)
Tokyo, Japan
- Led full-stack development of core logistics SaaS platforms used daily by hundreds of customers, owning features from concept through production.

- Designed and built scalable backend services and RESTful APIs using Ruby on Rails, with strong focus on performance, maintainability, and clean architecture.

- Developed and maintained responsive frontend interfaces with JavaScript, HTML, and CSS (pre-heavy SPA era).

- Dramatically improved application performance through database schema redesign, query optimization, indexing, and large-scale refactoring.
Established solid engineering foundations: development workflows, coding standards, code review processes, and testing practices as the team grew.

- Mentored junior engineers, led onboarding, and helped scale the engineering culture remotely.

- Worked fully remote from day one, collaborating effectively across Japan and international time zones with product, sales, and customer success teams.
Full Stack Database Management (e.g., SQL, NoSQL) Wordpress Shopify Web Scra