Available for Senior .NET / Architecture Roles•Azure Solutions Architect Expert (AZ-305)

LE VIET THANH TUNG • 6+ YEARS EXPERIENCE

Architecting Resilient
Distributed Systems

Senior .NET Software Engineer designing high-throughput event-driven microservices with C#, .NET 8, Apache Kafka, and Microsoft Azure. Proven leadership across US retail POS synchronization, automotive catalogs, and enterprise SaaS rules engines.

(+84) 969 012 781

Hanoi (UTC+7)

Experience

Years Enterprise

AZ-305

Architecture

Azure Solutions Expert

99.99%

Target Availability

Resilience Mindset

10M+

Event Ingestion

Msgs / High Scale

Interactive 3D Architectural Showcase

Flagship Enterprise Architectures

Hover over cards to experience 3D depth. Real-world systems designed for US supermarket chains, global automotive suppliers, and high-velocity behavioral analytics.

Distributed SystemsTeam Lead & Technical Solution OwnerUnited States (Enterprise Retail)

E-Commerce Platform for US Supermarket Chain

Large-scale enterprise retail and e-commerce platform supporting nationwide supermarket operations, product catalog, warehouse logistics, shop POS operations, and seamless edge-to-cloud data synchronization.

C#.NET CoreASP.NET CoreReactJSNext.jsTypeScriptDockerKubernetesAzureRabbitMQApache KafkaGraphQLgRPC

Engineered Architecture Pipeline

Fault-Tolerant • Zero Data Loss Certified

Stage 01

Edge Stores (1,000+)

Offline SQLite & Sync Engine

Stage 02

gRPC Gateway & YARP

Load Balanced Reverse Proxy

Stage 03

Apache Kafka Cluster

Dead-Letter Queues & Outbox

Stage 04

AKS Microservices

Idempotent Consumers + SQL

Architectural Highlights & Engineering Decisions

Offline-First Synchronization

Engineered localized edge cache and store queue that buffers sales offline and syncs with central cloud clusters via gRPC streams when connectivity restores.

Dual Protocol Strategy (GraphQL & gRPC)

Optimized network boundaries with GraphQL for responsive client querying and gRPC for sub-millisecond server-to-server interop.

Idempotent Event Workers

Eliminated double-charging and race conditions under peak traffic spikes using distributed Redis locking and database idempotency verification.

Direct Responsibilities & Implementation Scope

Designed and implemented backend services and service boundaries for warehouse management, shop operations, product catalogs, inventory, and order workflows.
Built high-performance RESTful and GraphQL APIs for client apps and deployed gRPC for internal low-latency microservice communication.
Engineered event-driven message pipelines using Kafka and RabbitMQ for asynchronous order processing and inter-service coordination.
Created resilient background workers for real-time inventory re-calculations, distributed order states, and data reconciliation.
Engineered offline operation support allowing physical shops to process transactions during temporary network outages with bidirectional sync upon reconnection.
Enforced idempotency keys, exponential retry policies, fault isolation, and dead-letter queues across all distributed queues.
Mentored team members, conducted architecture reviews, coordinated sprint deliverables, and owned production release reliability as Team Leader.

Verified Production Milestones:✓ Multi-Store Nationwide Scale✓ Zero-Data-Loss Offline Sync✓ Sub-100ms Internal RPC✓ Lead Role

United States (Enterprise Retail) • Senior Software Engineer / Team Leader

Enterprise BackendCore Backend & Data EngineerMulti-national / Automotive Branches

Vehicle & Spare Parts Enterprise Management Platform

Enterprise platform centralizing millions of vehicle spare parts across international branches, countries, and automotive brands with localized regulatory, pricing, and taxation rules.

C#.NET CoreASP.NET CoreReactJSNext.jsTypeScriptDockerAzureSQL ServerCosmos DBRedis

Cloud & ArchitectureMicroservices & Serverless EngineerEnterprise SaaS

Business Behavior & Organizational Rules Platform

Modular enterprise platform for dynamically configuring, evaluating, and tracking complex business rules, compliance triggers, and organizational activities with asynchronous event ingestion.

C#.NET CoreASP.NET CoreReactJSTypeScriptAzure FunctionsDockerSQL ServerRedisElasticsearch

Interactive Architecture & Code Lab

Event-Driven Distributed Systems in Action

Witness how high-scale .NET 8 event pipelines handle high-volume order surges, edge store offline synchronization, and automated fault recovery in real-time.

1. High-Concurrency Order Ingestion (Kafka + Idempotency)

Simulates 50,000+ checkout requests hitting ASP.NET Core API Gateway, pushing to Apache Kafka with idempotency validation and async worker settlement.

Pipeline Flow (Swipe):

Stage 01→

Client / Edge POS

Web / Mobile / Store

Standby

Stage 02→

API Gateway

ASP.NET Core / Auth

Standby

Stage 03→

Message Bus

Kafka / RabbitMQ / Azure

Standby

Stage 04→

.NET 8 Workers

CQRS / Outbox / Polly

Standby

Stage 05

Hybrid Storage

SQL / Cosmos / Redis

Standby

Client / Edge POS

Web / Mobile / Store

Standby

API Gateway

ASP.NET Core / Auth

Standby

Message Bus

Kafka / RabbitMQ / Azure

Standby

.NET 8 Workers

CQRS / Outbox / Polly

Standby

Hybrid Storage

SQL / Cosmos / Redis

Standby

Distributed Telemetry Log & Trace Stream

0 / 5 steps executed

Click “Simulate Workflow” above to execute event pipeline and trace distributed telemetry packets.

Architecture & Principles

Architectural Pillars & System Design

Building resilient, maintainable, and observable distributed systems designed to withstand high production loads, edge network partitions, and enterprise growth.

Kafka Topic: retail.events.orderPartition Balanced (0..15)

ACK: ALL In-Sync Replicas

Idempotent Key Hash Lock

DLQ Buffer 0% Drop Rate

Distributed Systems

Event-Driven & High-Throughput Messaging

Engineering decoupled architectures powered by Apache Kafka, RabbitMQ, and Azure Service Bus. Enforcing strict idempotency keys, deduplication caches, transactional outbox pattern, and dead-letter queues (DLQ) to guarantee zero message loss during traffic spikes.

Azure Certified: Solutions Architect Expert

Gold Credential Verified

AZ-305 Expert

Azure Solutions Architect

Certified Azure Solutions Architect Expert (AZ-305). Designing resilient cloud infrastructure with AKS (Kubernetes), Docker containerization, Azure Functions, Azure SQL, and automated Azure DevOps CI/CD.

Domain & EntitiesIsolated

Application (CQRS / MediatR)Use Cases

Infrastructure & AdaptersI/O Plugins

Clean Architecture

Clean Architecture & DDD / CQRS

Decoupling core business logic from infrastructure using Domain-Driven Design, Command Query Responsibility Segregation (CQRS), and MediatR pipelines for testable, modular domain code.

Redis Cache Hit Ratio94.8%

Redis P99: 1.2msLoad Slashed 70%+

Performance

Hybrid Data & Smart Caching

Choosing the right database for the access pattern: SQL Server for ACID transactions, Cosmos DB for polymorphic metadata, Redis for sub-millisecond caching, and Elasticsearch for fast log queries.

99.99% Production Target

Polly Circuit Breakers + SQLite Edge Sync ensuring 1,000+ stores transact seamlessly even during full ISP outages.

High Availability

Resilience & Offline Synchronization

Applying Polly retry policies with exponential jitter, circuit breakers, timeout isolation, and local edge caching that reconciles state automatically when stores reconnect.

Technical Capabilities

Comprehensive Skills Matrix

Battle-tested technologies and design practices utilized in production distributed systems over 6+ years.

.NET & Languages

8 skills

.NET 8 / .NET Core

ASP.NET Core

Entity Framework / EF Core

TypeScript

JavaScript

SQL (T-SQL, PL/pgSQL)

ASP.NET MVC

MasteryAdvancedProficient

Architecture & Patterns

8 skills

Microservices

Distributed Systems

Event-Driven Architecture

Clean Architecture

Domain-Driven Design (DDD)

CQRS & MediatR

SOLID & Design Patterns

Idempotency & Retry Policies

MasteryAdvancedProficient

Messaging & APIs

8 skills

Apache Kafka

RabbitMQ

Azure Service Bus

RESTful Web APIs

gRPC

GraphQL

Background Services

Azure Functions

MasteryAdvancedProficient

Databases & Caching

6 skills

Microsoft SQL Server

Azure SQL

PostgreSQL

Redis Distributed Cache

Azure Cosmos DB

Elasticsearch

MasteryAdvancedProficient

Cloud & DevOps

6 skills

Microsoft Azure

Azure DevOps & Pipelines

Docker Containerization

Kubernetes (AKS)

CI/CD Automation

Git & Branching Workflows

MasteryAdvancedProficient

Frontend & Legacy Modernization

6 skills

React

Next.js

Angular

HTML5 / CSS3 / Tailwind

Legacy WebForms & WCF Migration

jQuery / AJAX Modernization

MasteryAdvancedProficient

Career Milestones

Professional Experience & Track Record

Over 6 years of technical leadership, architecting mission-critical distributed services, and partnering with global teams.

Oct 2025 – Present

Senior Software Engineer

Orient Software

High-scale enterprise distributed platforms & cloud modernization

Oct 2025 – Present

Senior Software Engineer

Orient Software

High-scale enterprise distributed platforms & cloud modernization

Orient Software•Hanoi, Vietnam / International Projects

Oct 2025 – Present

Design and develop enterprise applications and distributed systems using C#, .NET, ASP.NET Core, and Microsoft Azure.

Own backend technical solutions, including application structure, API design, service boundaries, integration flows, and implementation approach.

Build RESTful APIs, asynchronous workflows, background workers, and event-driven processing with Kafka, Azure Service Bus, and RabbitMQ.

Apply retry policies, timeout handling, idempotency, centralized exception handling, and fault isolation to improve reliability.

Diagnose complex production issues across application services, APIs, databases, networking, and cloud infrastructure.

Optimize application performance, database queries, caching strategies, message processing, and service communication.

Participate in client discussions, technical estimation, sprint planning, code reviews, documentation, release planning, and production support.

Maintain Azure DevOps CI/CD pipelines for automated build, testing, deployment, and environment configuration.

Support legacy modernization by introducing modern .NET APIs, cleaner architecture, asynchronous processing, and cloud-native practices.

Primary Technologies & Workflows:

C#.NET 8ASP.NET CoreAzureKafkaRabbitMQService BusDockerK8sCI/CD

2021 – Oct 2025

Full Stack Engineer

Rikkeisoft, ASG, FPT Software

Enterprise business platforms, e-commerce, vehicle management & legacy modernization

2021 – Oct 2025

Full Stack Engineer

Rikkeisoft, ASG, FPT Software

Enterprise business platforms, e-commerce, vehicle management & legacy modernization

Rikkeisoft, ASG, FPT Software•Vietnam / Various Enterprise & International Projects

2021 – Oct 2025

Developed enterprise applications using C#, .NET Core, ASP.NET Core, ASP.NET MVC, ReactJS, TypeScript, and Microsoft Azure.

Built RESTful APIs, business modules, background jobs, and integrations with internal and third-party systems.

Worked with modern and legacy platforms, including ASP.NET MVC, WebForms, WCF, jQuery, and AJAX, facilitating smooth migrations.

Applied Microservices, Clean Architecture, DDD, CQRS, SOLID principles, and design patterns to complex business domains.

Designed data models and optimized SQL queries, indexes, stored procedures, and Entity Framework data access.

Used Redis, Cosmos DB, and Elasticsearch for caching, flexible data storage, search, and filtering capabilities.

Implemented CI/CD pipelines with Azure DevOps and supported Docker-based application deployment.

Collaborated with international clients and Agile/Scrum teams throughout analysis, development, testing, deployment, and support.

Primary Technologies & Workflows:

C#.NET CoreASP.NET MVCReactJSTypeScriptSQL ServerCosmos DBElasticsearchRedisAzure DevOps

Accreditations & Professional Standards

Certified Architectural Excellence

Rigorous, officially verified Microsoft Solutions Architect Expert credentials and fluent international collaboration standards.

AZ-305 Gold TierVerified Microsoft Expert

Azure Solutions Architect Expert

Issued by Microsoft

Mastery in designing cloud, hybrid, and microservices architectures on Microsoft Azure. Validates deep capabilities in compute, storage, security, business continuity, and disaster recovery.

Key Competencies Validated:

Design governance, monitoring, and zero-trust identity (Entra ID)

Architect high-availability data storage (Azure SQL, Cosmos DB)

Engineer business continuity, geo-replication & disaster recovery

Design containerized infrastructure (AKS, Azure Functions, APIM)

Tier: Expert (Highest Technical Tier) Active & Certified

International TierCross-Border Delivery

Professional English Proficiency

Track Record: US & Global Client Projects

Fluent technical and business communication with multinational product stakeholders, overseas engineering teams, and executive management.

Collaboration Scope:

Technical architecture documentation, ADRs, and RFC proposals

Daily sprint ceremonies, cross-time-zone grooming & standups

Direct requirement elicitation with US enterprise product owners

Mentoring junior engineers and code reviews in professional English

Working Level: Fluent / Professional Global Collaboration

Direct Channels

Initiate Direct Discussion

Interested in scaling distributed backends, modernizing legacy systems, or consulting on Azure cloud architecture? Contact me directly via email, phone, or instant message.

Direct Contact Information

Lê Viết Thanh Tùng

Senior .NET Software Engineer • Azure Solutions Architect Expert

Primary Email

tungle3001.itfreelancer@gmail.com

Direct Phone / Hotline

(+84) 969 012 781

Zalo

Hanoi, Vietnam (UTC+7) — Flexible with US/EU time zones

6+ Years of Enterprise Distributed Systems

Open to High-Impact Senior, Lead & Architecture Roles

Download Complete Resume (PDF)

Send a Direct Message

Have an inquiry about an engineering challenge or role? Leave your notes below.

Architecting Resilient Distributed Systems

Architecting Resilient Distributed Systems

Flagship Enterprise Architectures

E-Commerce Platform for US Supermarket Chain

Architectural Highlights & Engineering Decisions

Direct Responsibilities & Implementation Scope

Vehicle & Spare Parts Enterprise Management Platform

Business Behavior & Organizational Rules Platform

Event-Driven Distributed Systems in Action

1. High-Concurrency Order Ingestion (Kafka + Idempotency)

Architectural Pillars & System Design

Comprehensive Skills Matrix

.NET & Languages

Architecture & Patterns

Messaging & APIs

Databases & Caching

Cloud & DevOps

Frontend & Legacy Modernization

Professional Experience & Track Record

Senior Software Engineer

Senior Software Engineer

Full Stack Engineer

Full Stack Engineer

Certified Architectural Excellence

Azure Solutions Architect Expert

Professional English Proficiency

Initiate Direct Discussion

Lê Viết Thanh Tùng

Send a Direct Message

Architecting Resilient
Distributed Systems