SENIOR BACKEND / SYSTEMS ENGINEER
Kevin Wang
I turn fragmented systems into reliable production workflows.
Backend, systems, and integration engineer with 13+ years of experience taking over real production systems, defining boundaries between services and vendors, and turning messy workflows into reliable software.
Taiwan · Remote
01 / EXPERIENCE
Production systems, not demo apps.
A concise public view of the work. Project pages go deeper into constraints, architecture, and trade-offs.
Blockchain Systems Development Engineer
Quande Information Technology
Own and evolve existing production systems spanning customer operations, messaging, integrations, data, deployment, and reliability.
- Operate a notification platform delivering 1M+ push notifications and 50K+ SMS messages per day across five SMS providers.
- Own a customer-operations platform deployed to Azure Web App with VM and SQL-backed services; improved a 12-tab user view from blocking full-page loading to independently loaded and refreshable tabs.
- Use application-side revalidation plus downstream state checks for operations that mutate external system state.
- Maintain C#/.NET and SQL Server services across Azure and IIS, with production monitoring through Application Insights.
01
Software Engineer
Education Budget & Accounting Platform
Maintained and evolved a long-lived budgeting and accounting platform serving 3,300+ schools and roughly 15,000 users.
- Evolved .NET Framework / SQL Server production workflows while preserving compatibility with older fiscal-year data.
- Introduced new fields incrementally rather than forcing incompatible schema assumptions onto historical records.
- Supported decision-period aggregation by moving shared summary work to overnight processing when many schools needed the same calculations in a short window.
- Owned production maintenance, reporting, SQL troubleshooting, and ongoing business-rule changes.
02
Software Engineer
Duty-free Retail Incentive Platform
Designed the ETL pipeline and co-designed the backend calculation model for a multi-store incentive-calculation system.
- Designed Oracle-to-SQL Server ETL flows for data from roughly 6–7 high-volume retail stores.
- Handled incomplete records, encoding problems, invalid characters, failed records, and orphan data with explicit classification and replay paths.
- Implemented complex incentive rules varying by store, product category, team, and specific products.
- Replaced extensive manual report cross-referencing with system calculation so HR could focus on validation.
03
02 / CORE SKILLS
What I use to get systems shipped.
Backend
- C#
- .NET / ASP.NET
- Web APIs
- Dapper
- SSE
- Background processing
Data
- SQL Server
- Oracle
- Query optimization
- ETL / SSIS
- Data modeling
- Reporting
Cloud & Ops
- Azure App Service
- Azure Blob Storage
- Azure SQL
- Application Insights
- IIS
- Production monitoring
Integration
- Third-party APIs
- Messaging providers
- Modbus TCP
- Protocol integration
- Retry & state handling
- System boundaries
AI-assisted Delivery
- Problem framing
- Architecture & contracts
- Grill → spec → tickets
- AI-assisted implementation
- Code review
- Acceptance & verification
03 / SELECTED WORK
Three systems worth opening.
All case studies →01
Live system
Open → PatchGrid
Production Monitoring & Delivery Platform
A production system for scheduled and real-time monitoring, operational visibility, and delivery tracking. Used as an ongoing modernization project and portfolio case study.
02
Delivery project
Open → MSAR / ITRI
AI + GIS Search & Rescue Workflow
A modular search-and-rescue workflow coordinating GIS inputs, AI inference, expert rules, route analysis, post-processing, and delivery outputs under real project constraints.
03
Production
Open → Messaging Platform
Multi-provider Notification Delivery
High-volume push and SMS delivery with multiple providers, configurable routing, retry behavior, delivery states, and operational monitoring.
REMOTE · TAIWAN
Backend, integration, production ownership.
This site is intentionally resume-first. The portfolio is where the systems get unpacked.