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Experience

Selected roles and measurable contributions.

The most relevant work from a career spanning AI, backend systems, modernization, quality engineering, e-commerce, and embedded software.

  1. AI Engineer

    Hitachi Astemo (TEKsystems) · Tokyo, Japan

    Feb 2025 - Mar 2026
    • Built Power Platform and Azure tools that automated document translation and meeting workflows.
    • Developed .NET 8 Azure Function Apps that exposed reliable Translator API endpoints for Power Automate integrations.
    • Migrated legacy services into a new Azure tenant and modernized the internal SMTP MTA with .NET 10 Azure Functions, Service Bus, and Storage, reducing frontend sending latency by more than 60%.
    Power PlatformAzure OpenAIAzure AI FoundryAzure Functions.NET 8/10

  2. Application Engineer

    Rakuten (Michael Page) · Tokyo, Japan

    May 2023 - Jun 2024
    • Built .NET 8 REST microservices and modernized legacy .NET Framework modules.
    • Led critical bug resolution and performance optimization while partnering with product managers from requirements through deployment.
    • Improved release confidence with MSTest unit and integration automation plus Python/Locust stress testing.
    .NET 8DockerKafkaKubernetesLocust

  3. Backend Engineer · Technical Lead

    Yungching Realty Co., Ltd. · Taipei, Taiwan

    Feb 2020 - Jun 2022
    • Led a company-wide migration from .NET Framework to ASP.NET Core 3.1.
    • Architected a real-estate Web API platform with 3D virtual tours, district search, and location-based services.
    • Used Redis caching and batch processing to improve property search performance by 50%.
    • Integrated Google Maps APIs and maintained integration and unit tests with MSTest during the migration.
    ASP.NET CoreRedisSQL ServerGoogle Maps API

Earlier experience includes QA Engineer, Full-stack Engineer, Embedded Software Engineer.