Chris Hui

Languages

• Java, TypeScript, Python, Kotlin

AWS

• ECS Fargate, Batch, Lambda, DynamoDB, S3, CloudFront, SNS, Bedrock, CloudWatch

Backend & Systems

• Distributed system design, event-driven architectures, CI/CD, infrastructure-as-code, Docker

GenAI

• LLM agent orchestration (PydanticAI), RAG, vector embeddings, knowledge graphs

Certifications

• AWS Certified Developer – Associate
• AWS Certified Solutions Architect – Associate

Amazon Software Development Engineer II

Mycelium – GenAI platform for augmented security reviews

• Architected the system end-to-end: REST API on ECS Fargate, AWS Batch worker pipeline, DynamoDB, SNS event notifications, React/CloudFront frontend, and CDK infrastructure-as-code.
• Built the core analysis engine: tree-sitter code parsing, Cohere vector embeddings, and Claude LLM agents (via Bedrock) orchestrated with PydanticAI to answer structured security questions and generate system diagrams.
• Adopted by 50+ security engineers, cutting review onboarding time by ~60%.

Prime Student Free Trial – Subscription launch

• Built backend support enabling Prime Student Free Trial signups across multiple devices and marketplaces, integrating with an internal student verification service.
• Implemented dynamic offer-selection logic to serve correct trial offers based on customer eligibility.
• Led cross-team resolution of P1 launch blockers and drove the phased rollout to production.

Prime plans on iOS & tvOS – Apple Pay integration

• Designed and shipped Apple Pay integration for Prime plans on Prime Video iOS and tvOS apps, including double-billing prevention, geo-gating, tax/invoicing compliance, and offer transaction handling.
• Launched across Prime Video marketplaces globally.

Channel Offers Workflow Service – Workflow engine

• Built a Kotlin workflow engine for Prime Video channel subscriptions, supporting task execution, sub-workflow delegation, and conditional branching across devices.
• Designed and implemented versioned workflow configurations (CDK, DynamoDB, Lambda deployer), fixing a customer-facing bug where mid-checkout config changes caused error pages.
• Led migration from the legacy onboarding service using a shadow-testing strategy.

Atkins Civil Engineer

• Worked as a civil engineer on UK and Hong Kong infrastructure projects including Sizewell C nuclear power station and the Hung Shui Kiu New Development Area.
• Led BIM modelling teams (up to 9 engineers/technicians), delivered construction programmes, and produced technical designs for nuclear infrastructure.