Senior Software Engineer
Winston Yeung
Senior Full Stack Software Engineer
I build reliable software for complex workflows across SaaS, healthcare, fintech, legal technology, and cloud platforms.
Backend foundations → APIs and integrations → cloud and AI-enabled systems
About
I'm a software engineer who has spent my career building products in industries where reliability matters. I work across product workflows, application features, backend architecture, APIs, integrations, cloud systems, data handling, security, and production stability.
I enjoy understanding the real workflow behind a problem and turning it into software that is clear for users and maintainable for engineering teams.
Selected Work
Connected Design and Commerce Workflows
Application features, backend services, APIs, and cloud integrations connecting configuration, planning, quoting, and ordering into reliable multi-tenant design-to-commerce workflows.
Context: Design Flex and 3CAD product context
Privacy-Aware Clinical Assessments
Full-stack posture and movement assessment workflows—image capture, analysis, history, progress comparison, reporting—with privacy-aware handling of health-related data.
Context: PostureScreen and RemoteScreen ecosystem
Secure Merchant and Payment Operations
Backend APIs, partner integrations, validation, and operational tooling for merchant and payment workflows where correctness, auditability, and production stability are critical.
Cloud Legal Practice Workflows
SaaS product and backend features across matters, calendaring, billing, trust, documents, and integrations for cloud legal practice management.
Context: Clio Manage
Experience
Senior Software Engineer · Cyncly
Developed scalable application features, backend services, and cloud integrations supporting design-to-commerce workflows across SaaS platforms serving the interior design and furniture industry.
Senior Software Engineer · PostureCo
Built image-based clinical assessment workflows, secure patient data handling, reporting systems, and full-stack features for the PostureScreen and RemoteScreen product ecosystem.
Software Developer · Nuvei
Built and maintained backend APIs, transaction processing workflows, partner integrations, and logging and observability tooling across high-availability payment infrastructure.
Software Engineer · Clio
Engineered product features across matter management, billing, calendaring, document handling, and third-party integrations for a leading cloud legal practice management platform.
SDE Intern · AWS · CloudFormation
Contributed to infrastructure tooling and automation within the AWS CloudFormation team during a software development engineering internship.
QA Automation Developer · Merrill Lynch
Designed and implemented automated test frameworks and quality assurance workflows for financial software systems.
Student Intern · Ontario Institute for Cancer Research
Developed research software tools supporting data analysis and scientific workflows in a biomedical research environment.
Capabilities
Backend services and APIs
REST, GraphQL, gRPC · event-driven · microservices
Cloud and platform engineering
AWS, GCP, Azure · IaC · CI/CD · container orchestration
Full stack product development
React, TypeScript · Node.js, Python · end-to-end ownership
Enterprise integrations
Webhooks, OAuth · partner APIs · data pipelines · sync workflows
Secure and reliable data workflows
PostgreSQL, Redis · migrations · encryption · audit logging
AI-enabled product engineering
LLM integration · embeddings · RAG patterns · responsible design
Engineering Principles
Understand the workflow before designing the system
Treat reliability as a product feature
Prefer maintainable systems over clever complexity
Own the outcome, not only the ticket
B.Sc. Computer Science
University of Toronto
Contact
Let's build something dependable.
I'm open to senior software engineering roles across full stack, backend, cloud applications, platform engineering, DevSecOps-focused development, and AI-enabled product engineering.