Vo Thanh Do

• Systems & Ownership: Core CRM Platform (API, Middleware, RBAC) - owned end-to-end; Automation Workflow Engine for business processes & AI search; Retailer Systems: Internal Tools and Online eCommerce features (Team Stores, Customer Favorites, Buying & Logistics).
• System Architecture: Multi-tenant design (Tenant/Business Unit/User isolation); dynamic RBAC with granular permissions; flexible data model (Object/Attribute/Condition); workflow engine for complex business processes; natural language search.
• Microservices (.NET & NestJS): Designed/decomposed services by bounded contexts; DI-first, versioned REST, OpenAPI/Swagger, clear service boundaries.
• Event-driven (RabbitMQ): Built pub/sub & work-queues with routing keys; idempotent consumers, retry/backoff, DLQ; transactional outbox for data/event consistency.
• AI & Automation: LLM agents for CS support & marketing reports; AI size chart → reduced manual data entry; AI import → accelerated data processing for Logistics; human-in-the-loop for low-confidence cases; validation, rate-limits, audit trails.
• AI parsing & content: Semi-structured inputs → strict JSON with schema validators/fallbacks; automated accessibility content; FE consumption designed to avoid UX regressions.
• Caching & Data: Redis for caching & performance; PostgreSQL/SQL Server (schemas, migrations, indexing, query shaping).
• Integration & Operations: Shopify, Amazon SP-API, Walmart WFS, Attentive, Kustomer; data consistency between ERP & sales channels; production stability & monitoring.
• Frontend (Next.js): Shipped SSR-safe CRM/Admin UIs with typed forms, schema validation, accessible states, error boundaries, and defensive rendering.
• Testing & test automation: Converted high-priority manual test cases → automated using Playwright (E2E) for CRM/Admin journeys; headless CI runs with reports/artifacts. Cypress (E2E smoke), Postman regression; contract tests for API clients.
• Cloud & DevOps: Containerized services; AWS; CI/CD with GitHub Actions/GitLab CI.
• Security: Applied OWASP controls (input validation, rate-limit, authZ policies); secret rotation & CI secret-scanning; coordinated pen-test fixes; standardized error taxonomy.
• Agile & leadership: Full Scrum cadence (planning/refinement/review/retro); partnered with QA/Product on DoD & acceptance criteria; mentored fresher engineers and facilitated weekly code reviews.
• Impact: Reduced manual workload for Marketing, CS & Logistics via AI automation; improved data accuracy across ERP & sales channels; designed scalable architecture enabling new channel integrations without major refactoring.

• Backend: REST endpoints with ASP.NET Web API & NestJS (controllers, DTO validation), OpenAPI/Swagger; consistent error model.
• Queues: RabbitMQ for small background tasks; basic retry/backoff & DLQ; logged processing results for debugging.
• Data modeling: PostgreSQL & SQL Server schemas; added index/pagination; small migrations.
• Frontend: Next.js pages (auth, forms, tables); controlled forms with validation; SSR-safe data fetching.
• Testing & CI: Cypress/Playwright smoke for login/CRUD; Postman runner; GitHub Actions/GitLab CI (build/test/lint).
• Cloud & security: exposure to AWS S3/CloudWatch logs; minimal-privilege IAM; OWASP basics (input validation, CORS, rate-limit).
• Agile: stand-ups and planning.

• ASP.NET foundations: small MVC/Razor modules (auth/CRUD), session/cookie handling; connected SQL Server via EF/stored procedures.
• HTML/CSS/JS: semantic pages, forms, DOM events, mobile-first layouts.
• Frontend basics: small SPA consuming REST endpoints.
• WPF (.NET, Prism/MVVM): device-management UI (USB), configuration screens, persisted settings.
• Agile & CI: learned stand-ups and code reviews; minimal build/test pipeline.