Senior Full-Stack Software Engineer & Architect
Resume:
Colin Jao
U.S. Citizen
Carrollton, TX
*****.***********@*****.***
Sr. Software Engineer / Programmer / Architect
OBJECTIVE
Seeking a position focused on designing and developing enterprise-grade, full-stack applications using .NET Core, C#, Web API, Angular (2 – 19), React, TypeScript, and Microservices architecture.
Looking to contribute to projects that emphasize PWA development, responsive web design (RWD), accessibility, UI/UX engineering, and cross-platform performance optimization leveraging Blazor, Razor, SASS, Bootstrap, PrimeNG, Figma, and RxJS.
Dedicated to building secure, data-driven solutions integrating SQL & NoSQL databases, Entity Framework, LINQ, WCF, and JSON-based services, supported by modern front-end workflows with npm, jQuery, and mobile-ready interfaces.
QUALIFICATIONS
12+ years of professional experience delivering end-to-end full-stack solutions across healthcare, fintech, logistics, real estate, and SaaS domains, specializing in cloud-native, microservice-based enterprise applications.
Broad and advanced expertise in .NET Core, C#, ASP.NET MVC, Web API, Angular (2–19), React, TypeScript, and Blazor, building scalable, secure, and high-performance backend and frontend architectures for complex enterprise systems.
8+ years of senior-level UI/UX engineering experience designing and developing modern, responsive, and accessible web interfaces using Angular CLI, React, PWA, RWD, Bootstrap, PrimeNG, RxJS, SASS/LESS, JavaScript, npm, and Gulp/Grunt, emphasizing clean design systems and component-driven architecture.
Strong proficiency in database architecture, administration, and optimization with SQL Server, Oracle, and NoSQL platforms, leveraging Entity Framework (EF), LINQ, and modern ORM strategies for performance-driven and reliable data management.
Hands-on experience across major cloud ecosystems—Microsoft Azure (Functions, App Service, Service Bus, Blob Storage, DevOps, AKS) and AWS (Lambda, ECS, Fargate, S3, IAM, SQS, SNS)—with expertise in containerization (Docker, Kubernetes), CI/CD pipelines, and infrastructure automation for continuous delivery.
Deep understanding of software design principles and patterns (SOLID, DRY, Dependency Injection), with proven success in implementing RESTful APIs, microservices communication layers, and secure authentication flows (JWT, OAuth2, Azure AD B2C).
Demonstrated ability to lead and execute all stages of the software development lifecycle (SDLC) — from requirement gathering and architecture design through coding, testing, deployment, and post-production support — under Agile/Scrum methodologies.
Skilled in performance profiling, load optimization, and diagnostic troubleshooting across distributed environments, improving scalability, reliability, and code maintainability.
Results-driven and quality-focused professional with a proven record of delivering mission-critical solutions within scope and timeline, aligning technical excellence with business goals.
Excellent communicator and mentor with a strong focus on collaboration, documentation, and technical leadership, ensuring cross-team efficiency and continuous process improvement.
SKILLS
Backend Development:
C#, VB.NET, .NET Framework (MVC 3–8), .NET Core (1.1–9), ASP.NET MVC, ASP.NET Core, WebAPI, WCF, OOP, OOD, WWF (Windows Workflow Foundation), Entity Framework (EF, EF Core), LINQ, PLINQO, Dynamic Data, ADO.NET, NuGet Packages, Application Blocks, N-Tier / N-Project Architectures, Design Patterns (SOLID, Factory, Repository, Dependency Injection), SOA (Service-Oriented Architecture), CQRS, MediatR, gRPC, SignalR, OData, RESTful Services
Frontend Development:
React, Angular, TypeScript, JavaScript (ES6+), RxJS, Redux Toolkit, NgRx, Zustand, SPA Architecture, PWA Implementation, Material UI, Ant Design, Tailwind CSS, Bootstrap, Storybook, Responsive UI/UX Design, Accessibility (ARIA / WCAG), Cross-Browser Optimization
Databases & Data Tools:
SQL Server (6.5, 7, 2000–2022), T-SQL, DTS, SSIS, SSRS, Dynamic Data, Oracle (7, 9i, 10g, 11g, 12c), Oracle SQL Developer, TOAD, Oracle Explorer, PostgreSQL, MySQL, Cosmos DB, Cassandra, MongoDB, Visual FoxPro, MS Access, Sybase SQL, Data Warehousing, OLAP, RDBMS, ODBC, EF, PLINQO, LINQ, ADO.NET
Cloud, DevOps & Infrastructure:
Azure (App Service, Functions, SQL, Active Directory, Blob Storage, Service Bus, Event Hubs, DevOps, Kubernetes Service (AKS), Step Functions, DynamoDB, AD B2C, API Management), AWS (Lambda, API Gateway, S3, RDS, DynamoDB, CloudFront, Kinesis, SQS, SNS, IAM, CloudFormation, EC2, ECS, Fargate, CloudWatch, Elasticsearch), Docker, Kubernetes, Terraform, Jenkins, GitHub Actions, GitLab CI/CD, Bitbucket Pipelines, CruiseControl.NET, Red-Gate SQL Tools, Web Publication, TCP/IP, HTTP/FTP, LAN/WAN, IIS, Sentry, Datadog
Tools, IDEs & Environments:
Visual Studio (2001–2022), Visual Studio Code, Blazor Studio, SQL Server Management Studio, Azure Data Studio, PowerShell, SourceSafe, StarTeam, TFS, DevOps, N-Tier Architectures, Windows OS (XP – Windows 11), Windows Server (NT – 2022), Index Server 2, Microsoft Office Suite (PowerPoint, Word, Excel, Outlook, Visio), SharePoint (2003, 2007), Power Builder, Dreamweaver, Fireworks, Photoshop, ImageStyler, Linux
Reporting & Analytics:
Crystal Reports, SSRS (SQL Server Reporting Services), SSIS (SQL Server Integration Services), Power BI, Dynamic Data, Oracle Reports, Data Warehouse Reporting, OLAP Cubes
UI/UX Design & Prototyping:
Figma, Adobe Photoshop, Fireworks, Dreamweaver, FrontPage, SharePoint Designer, InfoPath, Responsive Wireframes, Component Library Design, User Flow Mockups
Version Control & Project Management:
Git, GitHub, GitLab, Bitbucket, Azure Repos, TFS, SourceSafe, StarTeam, Agile, Scrum, Kanban, SDLC, CI/CD, DevOps Pipelines, Jira, Confluence, Sprint Planning, Backlog Grooming
Recent Technology Updates:
Angular 19, TypeScript 5, .NET Core 9, Blazor (latest), Visual Studio 2022, SQL Server 2022, Figma, Cloud-Native Deployment Architectures
RELEVANT EXPERIENCE
Senior Software Engineer
Jan 2023 – Dec 2025
Zymr, San Jose, CA (Remote)
Domain / Industry: Healthcare, Fintech
Designed a cost-effective and secure financial data integration system, mapping multi-source transaction and KYC data into an optimized Azure SQL schema via Azure Functions (Blob Trigger), Azure Storage, and REST APIs.
Architected and deployed .NET 7 microservices for KYC/AML verification, user identity management, and transaction authentication — aligned with PCI-DSS and SOC2 compliance.
Engineered real-time transaction tracking and auditing pipelines using RabbitMQ, Azure Event Hub, and Cosmos DB, enabling automatic anomaly detection and violation logging.
Developed role-based access control (RBAC) and fine-grained permission layers across Blazor and Angular apps, ensuring secure, tiered user access for finance operations and audit teams.
Designed and built a Consolidated Financial Reporting (CFR) system that automated tax compliance, settlement reconciliation, and margin reporting with dynamic rule configuration every release cycle.
Improved SQL Server performance and ETL pipelines through Entity Framework Core 6, optimizing stored procedures, SSIS packages, and data indexing — achieving a 10–15% system performance boost.
Designed and maintained automated CI/CD pipelines using Azure DevOps (YAML) and Docker/Kubernetes, standardizing deployment and rollback strategies across cloud environments.
Created and documented data governance frameworks covering encryption, key rotation, PHI masking, and secure logging, ensuring PCI-DSS and GDPR adherence.
Designed pixel-perfect, responsive layouts using Material UI (MUI v5) and Tailwind CSS utility classes, ensuring seamless cross-browser and mobile compatibility.
Customized MUI themes (palette, typography, and component overrides) to align with brand design systems while leveraging Tailwind’s utility-first approach for rapid prototyping.
Integrated dark/light mode switching, custom typography, and dynamic theming via React Context, improving accessibility and user satisfaction scores.
Architected and implemented three enterprise-grade applications:
1.RESTful WebAPI (.NET Core) for transaction ingestion and service migration
2.Angular 18 PWA dashboard with Material 3 themes and live transaction visualizations
3.Blazor-based Financial Audit & Reporting Suite featuring workflow automation, e-signature, and Power BI insights
Integrated Azure Cognitive Search and Power BI Embedded for transaction analytics, automated insights, and interactive compliance dashboards.
Developed LRU-based in-memory caching with TTL, enhancing financial query speed from SQL Server and Cosmos DB for real-time dashboards.
Enhanced CRM modules for financial operations via ASP.NET Core REST APIs, synchronizing KYC and payment gateway data between internal and third-party systems.
Created a compliance-ready data exchange interface supporting HL7, FHIR, EDI X12, and financial data schemas, ensuring interoperability with regulatory bodies and payment processors.
Designed data validation and encryption workflows using AES and RSA, ensuring secure API payload exchange across distributed services.
Migrated .NET 4.0 monolith payment services to .NET Core WebAPI, restructured database logic, and re-engineered service orchestration through AKS microservices.
Implemented Prometheus/Grafana monitoring for transaction anomalies, latency metrics, and system SLAs across distributed deployments.
Developed Azure B2C policies for 20,000+ authenticated clients and partners, integrating MSAL authentication for mobile and web portals.
Deployed a real-time fraud and credit risk monitoring service leveraging AWS ECS, DynamoDB, and Fargate containers for predictive analysis and identity alerts.
Designed multi-threaded event handlers in .NET Core to process high-volume transaction messages — scaling to millions of records/day with minimal latency.
Integrated Bloomberg API and Plaid API for real-time market and banking data synchronization within the Fintech ecosystem.
Created reconciliation and anomaly-detection workflows using Azure Databricks, transforming transaction data from SQL and Cosmos DB for analytics and compliance auditing.
Developed automated alert services using Azure Functions for SLA breaches, account violations, and suspicious financial activity — pushing live notifications to system administrators.
Led data migration and schema rationalization during Azure tenant reorganization, ensuring zero downtime and full authentication continuity under new Azure AD configurations.
Implemented API Gateway architecture with rate limiting, JWT token rotation, and signature validation headers to secure financial endpoints.
Built credit scoring microservices in .NET Core using rule-based scoring models, providing creditworthiness indicators to front-end clients in milliseconds.
Created audit trail visualization UI using Angular Material, enabling compliance officers to trace transactional events and violation patterns across environments.
Developed custom SSRS financial reports, integrating e-signature and Power BI data models for executive audit dashboards.
Constructed event-driven architecture connecting transaction events from RabbitMQ queues to Azure Data Factory for downstream reporting pipelines.
Designed multi-tier approval workflows for KYC onboarding and financial transaction authorization, enabling structured multi-role approvals.
Migrated legacy monolith CFRMS project (financial management) from .NET 4.0 to .NET Core 8 WebAPI and Angular 17 with PWA support.
Collaborated in Scrum ceremonies, managed sprint boards in Azure DevOps, and delivered cross-functional epics on schedule with traceable documentation.
Mentored junior developers on secure coding, DRY/SOLID design, microservice orchestration, and pipeline optimization.
Conducted architecture and code reviews, authored internal design guidelines, and improved API consistency across product lines.
Delivered proof-of-concept documents and technology recommendation reports, influencing decisions for Azure migration and DevOps automation.
Implemented multi-cloud deployment strategies spanning Azure and AWS for disaster recovery and global transaction resiliency.
Created offline-ready PWA components for client-facing portals using IndexedDB and service workers to ensure continuity during connection loss.
Coordinated directly with product leadership and compliance officers to align development standards with organizational and federal regulations.
Designed end-to-end audit-ready documentation covering workflows, integrations, data lineage, and compliance mapping.
Provided technical leadership in cross-team integration efforts between frontend, backend, and data teams to improve throughput and transparency.
.NET Fullstack Software Engineer
Sep 2017 – Dec 2022
CMARIX, Dallas, TX (Onsite)
Domain / Industry: Real Estate, eCommerce, Logistics & Transportion
Designed and architected an enterprise-grade Logistics and Real Estate Management Platform using Angular 8, .NET Core, and Azure DevOps, delivering integrated solutions for fleet dispatch, property listings, inspection scheduling, and client engagement.
Developed map-driven dashboards for real-time fleet tracking and property visualization using Google Maps and OpenStreetMap, integrating geo-fencing, dynamic markers, and traffic overlays for live operational insight.
Architected and implemented multi-tenant property and order management systems, allowing real estate brokers and logistics partners to manage listings, shipments, and maintenance workflows through unified APIs.
Created a property inventory module with advanced search, filtering, and radius-based results using Azure Maps, Elastic Search, and SQL geospatial queries, improving discovery performance by 25%.
Engineered a Route Optimization & Dispatch System with live driver tracking, ETA updates, and location-based notifications, connected to Twilio SMS and Outlook/Google Calendar APIs for automatic appointment and inspection scheduling.
Developed label, invoice, and manifest generation services integrating FedEx/UPS APIs and QuickBooks billing workflows, automating back-office operations for logistics and property transactions.
Designed a document management service for lease contracts, inspection photos, and transaction receipts with Azure Blob Storage and secure URL access control.
Implemented Stripe and PayPal integrations for secure online payments covering real estate booking deposits, logistics charges, and invoice settlements with audit tracking.
Built a property analytics and occupancy dashboard using ngxCharts, Prometheus, and Grafana for performance metrics such as revenue per square foot, vacancy rate, and delivery accuracy.
Created Angular-based management portals for property agents and logistics coordinators, including modules for route planning, schedule management, and real-time delivery adjustments.
Designed a hybrid UI for eCommerce and property booking using Angular PWA, ensuring mobile responsiveness, offline access, and smooth sync through service workers and IndexedDB.
Developed a sales web portal using React to automate new customer entries with approval flows and credit analysis, utilizing .NET 5.3 and SQL Server.
Implemented Role-Based Access Control (RBAC) across all portals — providing secure access layers for agents, dispatchers, property managers, and clients via JWT, OAuth2, and Azure AD B2C.
Developed RESTful WebAPI microservices handling property CRUD operations, customer onboarding, inspection reporting, and delivery confirmation, all integrated through RabbitMQ queues for async event handling.
Architected a Real-Time Notifications Framework for maintenance requests, order updates, and client approvals using SignalR and WebSocket connections across applications.
Built PWA-based Driver & Agent Apps, enabling users to access schedules, submit updates, and upload images even when offline, syncing automatically when connectivity restores.
Integrated OpenWeatherMap API and Google Distance Matrix API to dynamically optimize routes and inspection timings based on real-time weather and traffic conditions.
Implemented SOC2, ISO 27001, and GDPR-compliant audit logging for all property and logistics transactions, ensuring traceability of user actions and system events.
Developed multi-language localization and regional compliance support for U.S. and international property/transportation markets, including tax rules and regional address validation.
Designed and implemented Data Visualization Dashboards for dispatch performance, occupancy, and property portfolio KPIs using Power BI Embedded and Angular Material charts.
Configured CI/CD pipelines via Azure DevOps and Jenkins to automate builds, testing, and deployments across logistics and real estate applications, reducing deployment time by 45%.
Deployed containerized applications using Docker and Kubernetes (AKS/EKS) to ensure scalable, high-availability operations for property management and delivery services.
Integrated Azure Key Vault and AWS KMS for credential encryption and key rotation, ensuring secure API transactions between services.
Worked with QA teams to develop test-driven components and unit testing coverage for Angular and .NET modules using Jasmine, Karma, and xUnit.
Collaborated directly with product managers, architects, and designers to align property listing modules with logistics dispatch workflows and ensure seamless data flow between business verticals.
Developed real-time inventory and asset tracking APIs connecting delivery assets to property events — e.g., materials arriving for a construction site or inspection vehicle movements.
Implemented Google Calendar integration for property viewing appointments and delivery route syncing, improving coordination and reducing scheduling conflicts.
Provided technical leadership and code review guidance, ensuring adherence to SOLID principles, performance standards, and DevOps best practices across multiple agile teams.
Trained junior developers and QA engineers on Angular architecture, DevOps CI/CD pipelines, and PWA deployment for multi-device support.
Created detailed architecture and flow documentation, defining system design for logistics dispatch, eCommerce ordering, and real estate property workflows.
Coordinated closely with compliance officers and IT leadership to align infrastructure security policies with SOC2 and ISO 27001 guidelines.
Delivered proof-of-concept prototypes demonstrating end-to-end logistics and real estate data synchronization, showcasing real-time location awareness and automated updates between modules.
.NET Developer
Jan 2014 – Aug 2017
GuideIT, Plano, TX (Remote)
Domain / Industry: Healthcare, eCommerce, Insurance
Contributed across all stages of the full SDLC in a Scrum and Sprint-based development cycle for multiple high-priority projects within the Healthcare, eCommerce, and Insurance sectors.
Architected and implemented dynamic menus, breadcrumbs, headers, and sitemaps using mobile-first responsive design (Skeleton, Bootstrap 3) with XML-driven data integration.
Designed and developed secure dashboards and portals supporting use cases such as policy management (insurance), product ordering and payments (eCommerce), and patient/record lookup (healthcare).
Implemented role-based authentication and authorization with URL routing for multi-tenant web applications across all domains.
Enhanced existing WCF and Web API services to expose new endpoints for real-time data exchange with CRM, insurance validation, and payment processing systems.
Built responsive UI layouts and components using Razor 2, HTML5, CSS3, Media Queries, and Bootstrap, ensuring a consistent and accessible user experience across browsers and mobile devices.
Implemented AJAX, JSON, and AngularJS to create interactive, single-page interfaces with real-time updates and live SVG chart visualizations for business KPIs and policy analytics.
Developed cross-domain sidebar controls and widgets that dynamically render user-specific content (e.g., customer profile, policy reminders, cart status) from external APIs.
Participated in extensive cross-browser, functionality, and performance testing for desktop and mobile users; identified and resolved UI rendering issues and latency bottlenecks.
Developed modular MVC architecture components—Views, Models, Controllers, Partial Views, and Repository layers—for large-scale business applications.
Enhanced SSRS operational reports and dashboards, creating financial summaries, policy reports, and daily transaction statements across different domains.
Created SSIS/ETL data packages for synchronization between SQL Server and external insurance/payment APIs, ensuring data integrity and secure transmission.
Refactored and optimized existing AngularJS modules, routes, factories, and directives, and integrated Angular 2 components for newer project modules, modernizing UI logic and code structure.
Enhanced and maintained Insurance Agent Management System (AngularJS + MVC + WebAPI) for managing company-employed and independent agents across U.S. states, including commission tracking and compliance reporting.
Built eCommerce modules with shopping cart functionality, order workflow automation, and payment gateway integration (PayPal, Authorize.Net), using WCF services and REST APIs for secure transaction handling.
Developed healthcare record components supporting HL7 and EDI X12 data integration, enabling secure patient information synchronization and compliance with HIPAA standards.
Designed and implemented Admin and Reporting tools using MVC 4/3 with Razor Engine, applying Singleton and Repository patterns, and integrating advanced jQuery plug-ins for enhanced usability.
Created LINQ and Lambda queries for optimized data retrieval using Entity Framework 4.3/5.0, improving data performance and simplifying business logic.
Implemented Generic Repository, Unit of Work, IOC/DI (Unity), ELMAH, and MVVM patterns for better modularity, exception handling, and code maintainability.
Developed custom data visualization widgets with Highcharts and Kendo UI, displaying claims, transactions, and performance metrics in real time.
Created and maintained stored procedures, triggers, and T-SQL scripts for transaction management, claims reconciliation, and eCommerce order fulfillment.
Worked in a Scrum-based Agile environment, tracking tasks, sprints, and deliverables via TFS and HP Quality Center; conducted peer code reviews and participated in sprint retrospectives.
Developed one-page MVC administrative tools for internal users with AngularJS, Knockout.js, Require.js, and jQuery UI, streamlining back-office workflows.
Implemented modern responsive designs using Media Queries, LESS/SASS, and Bootstrap, supporting accessibility and multi-device rendering.
Collaborated with UI/UX designers, product owners, and QA engineers to align business logic with usability, compliance, and performance standards.
Mentored junior developers on MVC, AngularJS, and best practices in responsive UI/UX, helping the team adopt consistent coding and deployment standards.
Worked closely with project managers and domain architects to design secure and compliant web solutions aligned with HIPAA (healthcare) and PCI-DSS (payment) regulations.
Managed configuration, builds, and deployments using TFS and MSBuild scripts, ensuring smooth release cycles and environment synchronization.
EDUCATION / TRAINING / CERTIFICATION
The University of Texas at Austin
B.S., Computer Science
05 / 2013
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