Ollie Tan

Senior Software Engineer · Milpitas, CA

Senior software engineer with 8 years of experience developing internal platforms, backend services, and cross-system integrations that improve operational efficiency and reliability. Built scalable web applications, workflow automation, and production systems using C#, Go, TypeScript, React, and AWS.

Experience

  1. Senior Full Stack Software Developer

    Advantech · Milpitas, CA

    I build internal platforms and workflow automation for warehouse and production operations.

    What I Was Responsible For

    • Lead development of an internal platform using .NET 9 and Next.js for equipment administration, scheduling, and tracking across warehouse and production operations.
    • Develop backend APIs in C# to support warehouse automation, inventory synchronization, production operations, and quality control across enterprise workflows.
    • Build CI/CD pipelines with GitHub Actions and automate API testing to improve release reliability.

    What I Delivered

    • Supported 5,000 users across 20 global warehouse and production sites through a single internal equipment platform.
    • Built a self-service shipping dashboard integrating SAP, UPS/FedEx APIs, and dimension-weight scanners, reducing large-carton shipping processing time by 75%.
    • Improved release reliability by automating deployment and API validation workflows.
    .NET 9Next.jsC#REST APIsSAPGitHub ActionsAutomation

  2. Software Developer

    Bank of Montreal · Toronto, ON

    I engineered microservices, internal tools, and platform modernization for investment and wealth systems.

    What I Was Responsible For

    • Engineered microservices and internal React tools in Node.js, C#, and Go for advisor workflows across investment and wealth platforms.
    • Led migration of 10+ services from on-prem infrastructure to AWS EC2 across QA and production environments.
    • Automated server hardening with Ansible and established documentation standards for team-owned services and architectures.

    What I Delivered

    • Supported advisor workflows and wealth systems serving up to 30,000 concurrent users.
    • Reduced infrastructure costs by 80% while improving uptime, scalability, and environment consistency.
    • Improved operational consistency across deployments, maintenance, and support with stronger hardening and documentation standards.
    C#GoNode.jsReactAWS EC2AnsibleMicroservices

  3. Software Developer

    Book4Time Inc. · Markham, ON

    I built business-facing SaaS features and hospitality integrations for wellness platforms.

    What I Was Responsible For

    • Developed business-facing features for hospitality and wellness platforms using C# and SQL Server stored procedures.
    • Implemented integrations with payment gateways, gift card providers, HTNG-based PMS systems, and access control platforms.
    • Led UI modernization of 700+ pages from Figma to production using React and SCSS.

    What I Delivered

    • Extended product capabilities for 10,000+ business clients through payment, PMS, gift card, and access-control integrations.
    • Validated a redesigned front-end experience through A/B testing and contributed to a 15% increase in seasonal sales.
    • Improved delivery quality by contributing to technical design decisions and sprint planning across feature work.
    C#ReactSQL ServerHTNGA/B TestingSCSS

  4. Web Developer

    CIK Telecom Inc. · Markham, ON

    I modernized legacy systems and automation workflows for telecom operations.

    What I Was Responsible For

    • Re-architected a legacy system into a modern Node.js and React application.
    • Integrated an auto-packing machine and robotic arms into back-office systems using C# and MQTT.

    What I Delivered

    • Eliminated recurring production failures caused by memory leaks and improved throughput by 10x.
    • Cut shipment backlogs by 40% through packaging automation and systems integration.
    Node.jsReactC#MQTTSystems Integration

Technical Skills

Languages
C# · Go · TypeScript · JavaScript · Python · SQL
Backend / APIs
.NET · ASP.NET Core · Node.js · Gin · FastAPI · REST APIs · gRPC · Microservices
Frontend
React · Next.js · Angular
Cloud / Systems
AWS EC2 · Docker · GitHub Actions · CI/CD · Ansible · Observability
Data / Messaging
SQL Server · PostgreSQL · Redis · MongoDB · MQTT · Kafka