Sonith Ch

Senior Software Engineer with 7+ years building multi-tenant SaaS platforms and event-driven serverless systems on AWS, with recent production work in AI engineering: LLM agents and agentic developer tooling. Core Stack: TypeScript · React · Next.js · Node.js

Senior Software Engineer at Trajector Medical (2024-07 – Present)

• Architected a multi-tenant serverless booking platform using SST, AWS, MongoDB, and Next.js, enabling isolated tenant environments with real-time notifications.
• Built multi-tenant authentication and authorization with AWS Cognito, MongoDB, and Cerbos, enabling fine-grained, policy-based access control.
• Established a secure event-driven architecture on AWS EventBridge, publishing internal domain events to external third-party consumers.
• Developed an event-driven AI agent using AWS Strands SDK, Lambda, and EventBridge to automatically parse user communications (email, messaging) and create booking appointments, reducing manual scheduling intervention by 10%.
• Engineered reusable agentic skills for GitHub Copilot and Claude to enforce spec-driven development, along with a CLI-based skill registry, improving developer productivity.
• Deployed and managed serverless applications on AWS CloudFront via SST and GitHub Actions CI/CD.
• Evaluated micro-frontend architectures (Web Components, Module Federation) to improve frontend scalability.

Software Engineer at Better.com (2022-12 – 2024-06)

• Shipped an end-to-end workflow comparing Cash-Out Refinance and HELOC options, increasing loan file closures by 5%.
• Created multi-page, multi-tenant application flows for mortgage and insurance products, driving a 10% increase in user engagement.
• Connected Trustpilot APIs with Iterable to automate review requests for funded customers, improving customer feedback collection.

Software Engineer at Larsen & Toubro Infotech Ltd (2019-06 – 2022-12)

• Delivered an end-to-end knowledge portal embedded within Microsoft Teams.
• Launched a bot-based notification service on Azure, providing real-time updates to end users within Teams.
• Automated on-demand SharePoint site provisioning using Azure Functions and WebJobs, reducing manual operational overhead.

B.Tech in Computer Science – IIT Mandi (2019)