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STATUS: ACTIVE // OPEN TO OPPORTUNITIES

Hi, I'm Nguyen Duy Toan

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Senior Backend Software Engineer with extensive experience specializing in Java, Spring Boot, microservices architecture, and high-throughput distributed systems for Fintech, Lending, and Enterprise platforms.

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EXTENSIVE
Production Exp.
$50M+
Annual Trans. Vol
99.7%
API Availability
98%
Latency Reduction
SYS.NODE // 3D_CORELATENCY: 12ms
DRAG TO ROTATE 3DKAFKA STREAM // ACTIVE
CORE TECHNICAL ARSENAL // PRODUCTION READY
Java
Java Core
Spring Boot
Spring Boot Framework
Kafka
Kafka Messaging
AWS Cloud
AWS Cloud Cloud
Docker
Docker DevOps
Kubernetes
Kubernetes Orchestration
Redis
Redis Cache
MySQL
MySQL Database
Elasticsearch
Elasticsearch Search
Python
Python Language
Oracle DB
Oracle DB Database
Jenkins
Jenkins CI/CD
Git
Git VCS
JavaScript
JavaScript Frontend
Java
Java Core
Spring Boot
Spring Boot Framework
Kafka
Kafka Messaging
AWS Cloud
AWS Cloud Cloud
Docker
Docker DevOps
Kubernetes
Kubernetes Orchestration
Redis
Redis Cache
MySQL
MySQL Database
Elasticsearch
Elasticsearch Search
Python
Python Language
Oracle DB
Oracle DB Database
Jenkins
Jenkins CI/CD
Git
Git VCS
JavaScript
JavaScript Frontend
Java
Java Core
Spring Boot
Spring Boot Framework
Kafka
Kafka Messaging
AWS Cloud
AWS Cloud Cloud
Docker
Docker DevOps
Kubernetes
Kubernetes Orchestration
Redis
Redis Cache
MySQL
MySQL Database
Elasticsearch
Elasticsearch Search
Python
Python Language
Oracle DB
Oracle DB Database
Jenkins
Jenkins CI/CD
Git
Git VCS
JavaScript
JavaScript Frontend
Nguyen Duy Toan
SYS.ID // NDT_01 VERIFIED
Nguyen Duy Toan
Senior Backend Software Engineer
// ABOUT THE ARCHITECT

Engineering resilient systems for mission-critical digital platforms

I'm a Senior Backend Software Engineer with extensive experience building scalable backend systems across Fintech, Lending, E-commerce, and enterprise SaaS platforms.

My core focus revolves around microservices architecture, event-driven messaging with Kafka, low-latency API design, and distributed data reliability with MySQL, DynamoDB, Oracle, and Redis. Having architected platforms processing $50M+ in annual transaction volume, I prioritize performance, fault-tolerance, and clean maintainable code.

Java & Spring Boot Kafka Event Streams Microservices Mesh AWS Cloud Architecture Docker & Kubernetes High-Availability APIs (99.7%)
Explore full engineering journey & career timeline
// FEATURED ARCHITECTURES & SYSTEMS

Mission-Critical Enterprise & AI Systems

Real-world distributed architectures, AI automation suites, digital retail lending, and high-concurrency platforms engineered for scale, uptime, and business impact.

AI & Workflow Automation ★ FEATURED
May 2026 - Present

Oasis Super AI - Creative & Automation Platform

Founder & AI Architect • Architect & Full-Stack AI Engineer

All-in-One AI creative suite unifying self-hosted ComfyUI image generation, n8n workflow orchestration, local Whisper STT, and automated social media distribution.

Architecture
Next.js 16 + React 19
AI Engines
ComfyUI + LLM Gateway
Workflows
Self-Hosted n8n
Inference
Whisper + Lama Server
// KEY ARCHITECTURAL RESPONSIBILITIES
  • Engineered automated AI generation pipelines connecting Next.js serverless functions with self-hosted ComfyUI clusters and OpenWebUI LLM gateways.
  • Integrated n8n workflow automation for continuous social media scheduling and analytics across Facebook, Instagram, and TikTok APIs.
  • Deployed self-hosted local inference micro-servers for Whisper (speech-to-text) and Lama (image inpainting) to optimize operational costs.
  • Structured full-text search, role-based access, and relational schemas using Prisma 7 with PostgreSQL 16 and Docker Compose.
#Next.js 16 #React 19 #TypeScript #TailwindCSS #PostgreSQL 16 #Prisma 7 #ComfyUI #n8n #OpenWebUI #Docker
View Verified in CV
E-Commerce & Distributed Backend ★ FEATURED
Mar 2026 - Jun 2026

Misti Shop - Modern Full-Stack E-Commerce

Founder & Lead Architect • Full-Stack Backend Architect

Production-grade e-commerce platform built on Java 21, Spring Boot 3, PostgreSQL, Redis, WebSockets, OpenTelemetry (SigNoz), and Next.js frontend with real-time group ordering.

Backend Stack
Java 21 + Spring Boot 3
Observability
OpenTelemetry + SigNoz
Real-Time
WebSocket + Redis
Database
PostgreSQL 15 + Flyway
// KEY ARCHITECTURAL RESPONSIBILITIES
  • Built resilient backend micro-architecture on Java 21, Spring Boot 3, Spring Security, JWT, and Flyway database migrations.
  • Designed a real-time 'Group Order' collaborative cart feature with WebSockets allowing multiple users to add items concurrently to a shared checkout session.
  • Implemented comprehensive distributed tracing and APM observability using OpenTelemetry (OTel) and SigNoz for end-to-end request latency profiling.
  • Optimized product catalog caching and session management using Redis Cache, slashing checkout database queries by 70%.
#Java 21 #Spring Boot 3 #PostgreSQL #Redis #WebSocket #Spring Security #OpenTelemetry #Next.js #TailwindCSS #Docker
View Verified in CV
Fintech & Digital Banking ★ FEATURED
Dec 2021 - Dec 2025

Personal Lending Platform (South Africa)

TymeX • Senior Software Engineer

A digital retail lending ecosystem in South Africa with automated decisioning, bank statement analytics, affordability scoring, and automated DebiCheck repayments.

Scale
National (SA)
Architecture
Microservices
Messaging
Apache Kafka
Availability
99.9% SLA
// KEY ARCHITECTURAL RESPONSIBILITIES
  • Designed and developed resilient, high-availability microservices handling loan origination, underwriting, and loan lifecycle management.
  • Integrated third-party APIs for bank statement parsing, algorithmic decision engines, and national payment processing networks.
  • Diagnosed and eliminated critical production bottlenecks in distributed data pipelines and event streaming via Apache Kafka.
  • Coordinated with international banking partners and stakeholders to maintain high compliance and 99.9% uptime SLA.
#Java #Spring Boot #AWS Lambda #API Gateway #Apache Kafka #MySQL #Flyway #Docker #Microservices
View Verified in CV Visit Platform
Payment & E-Wallet Ecosystem ★ FEATURED
Jun 2020 - Apr 2021

MoMo Merchant Solution & Partner Portal

M_Service (MoMo E-Wallet) • Java Software Engineer

Critical merchant onboarding and partner infrastructure for Vietnam's #1 e-wallet, automating KYC/KYB verification, prepaid cards, and payout settlements.

Scale
30M+ Users
Ecosystem
MoMo E-Wallet
Database
Enterprise Oracle
Security
KYC/KYB Compliant
// KEY ARCHITECTURAL RESPONSIBILITIES
  • Engineered backend services automating business onboarding, document verification, and KYC/KYB compliance workflows.
  • Developed high-throughput authentication flows and portal APIs for SME merchants with fine-grained role-based security.
  • Implemented merchant settlement payout flows, prepaid card balance management, and real-time transaction reconciliation.
  • Optimized enterprise Oracle DB schemas, stored procedures, and indexing for peak high-frequency transaction processing.
#Java #Spring Boot #Oracle DB #RESTful APIs #Microservices #OAuth2 #Redis
View Verified in CV Visit Platform
Explore All 9+ Production & AI Systems
// ENGINEERING INSIGHTS & PATTERNS

Latest Technical Writing

Deep dives into microservices, software design patterns, event-driven pipelines, and backend best practices.

View All Articles (5)
design patterns 5 min read

Understanding the Bridge Design Pattern

The Bridge pattern is a structural design pattern that decouples an abstraction from its implementation so that the two can vary independently.

#Java #Design Patterns #Structural Patterns
Read article
// FAQ & ENGINEERING PHILOSOPHY

Architecture, Skills & Working Style

Key insights into my tech stack, engineering ethos, and professional experience.

Languages: Java (primary), Python, JavaScript, HTML, CSS. Frameworks: Spring Boot, Spring Cloud, Play Framework. Messaging: Kafka, AWS MSK. Databases & Cache: MySQL, DynamoDB, Oracle, SQL Server, Redis. Cloud & DevOps: AWS, Docker, Rancher, Kubernetes, Jenkins. Search & Observability: Elasticsearch, Prometheus, Grafana. Testing & Tools: Postman, JMeter, IntelliJ, DataGrip, SourceTree. Extensive track record in microservices architectures, RESTful APIs, and distributed event-driven systems.
With extensive experience across high-scale engineering, I've built scalable fintech and e-commerce platforms processing $50M+ in transactions annually. I've architected microservices that reduced processing time by 98%, optimized database queries improving response times by 92%, and achieved 99.7% API availability across mission-critical services.
I hold a B.Sc. in Computer Science from Ton Duc Thang University (GPA: 3.1/4.0). My academic foundation combined with continuous self-learning and production-tested engineering has enabled me to stay ahead with modern distributed systems and cloud infrastructure.
I thrive in collaborative agile environments (Scrum, Kanban). Strong advocate for clean architecture, thorough code reviews, architectural RFCs, clear API contracts, and knowledge sharing. Experienced in cross-functional alignment between product managers, DevOps, QA, and external banking/fintech partners.
OPEN FOR SYSTEM ARCHITECTURE & BACKEND ROLES

Ready to scale your next high-throughput platform?

Whether you are designing a new microservice ecosystem, migrating legacy infrastructure, or optimizing database throughput, let's connect and discuss how I can contribute.

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