SENIOR BACKEND / SYSTEMS / INTEGRATION 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 / PROFESSIONAL EXPERIENCE
Production systems, not demo apps.
Most of my work starts with an existing system, real users, legacy constraints, and a boundary that needs to become reliable.
Senior Backend / Systems Engineer
Official title: 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; changed a blocking 12-tab user view into 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.
- Moved shared summary work to overnight processing when many schools needed the same calculations in a short decision window.
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 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.
- Automated complex incentive calculations so HR could focus on validating results instead of manually cross-referencing reports.
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 that show the pattern.
Professional, client & independent work →01
Owned Product · Production · Dozens of users
Open → PatchGrid
Live-event file delivery and coordination
Born from a real live-production problem: teams exchanging console and show files through filenames, dates, and version suffixes with no clear authoritative copy. PatchGrid is now a production SaaS used by dozens of users.
02
Client Delivery · Delivered system
Open → MSAR V2 / ITRI
Computation orchestration across multiple teams
An integration layer connecting frontend requests, DB APIs, frequently changing computation modules, result artifacts, and persistence. The architecture isolates team-owned code behind explicit execution boundaries.
03
Professional · Production
Open → Messaging Platform
High-volume multi-provider notification delivery
Production push and SMS delivery handling 1M+ push notifications and 50K+ SMS messages per day, with five SMS providers, retry behavior, delivery-state tracking, and operational troubleshooting.
REMOTE · TAIWAN
Backend, integration, production ownership.
I work best where software has to cross boundaries: legacy applications, databases, external providers, computation modules, devices, and the people operating them.