Asher Portfolio & ServicesSolving Complex Problems.
Building Scalable Systems.
Hi, I'm Asher (Le Thanh Trung), a Software Engineer building observable, highly scalable, consistent, and high-performance distributed systems in Go, Python, Rust, C, C++, and C#—architected across both service choreography and workflow orchestration on high-availability cloud-native and on-premises Kubernetes clusters.
Application Purpose: Asher Portfolio & Services provides software engineering showcases, interactive system simulators, and client portal services. Google Sign-In is used strictly for user authentication and session management to access interactive portfolio tools and client workspaces.
Asher Portfolio & Services complies with the Google APIs Terms of Service and the Google API Services User Data Policy, and does not generate, process, or facilitate AI-generated Non-Consensual Intimate Imagery (AI NCII).
Opening the store
A working demo store: browse, filter, fill a bag, check out and follow the order. Simulation: no real payment is taken.
- Seamless page transitions
- AI shopping assistant
- Checkout with a simulated bank
Tailored Engineering, Advisory & Coaching
Select any offering below to outline your project scope, technical escalation, or coaching goals and open a tracked service ticket directly with me.
Full-Stack Web & Microservices Engineering
Observable, highly scalable, consistent, and high-performance distributed systems in Go, Rust, Python, and Node.js—supporting both event-driven choreography and workflow orchestration, standardized OpenAPI platforms, and Next.js/React applications.
- Production-ready REST/OpenAPI microservice backend (Go / Rust / Python / Node)
- Modern, responsive Next.js / React full-stack frontend with state management
- Event-driven choreography, workflow orchestration & B2B partner API integrations
- Comprehensive test suite (unit, integration & boundary testing with CI/CD)
AI Agents, RAG Chatbots & LLM Workflows
Custom multi-tool AI agents and customer/seller chatbots using Python, Go, LangChain, and MongoDB Vector Search with short/long-term conversational memory and RAG pipelines.
- RAG knowledge retriever with semantic vector indexing (MongoDB Vector Search / Pinecone)
- Multi-tool LangChain / LangGraph agent workflows and tool routing
- Customer support & seller deflection conversational chatbots
- Rigorous evaluation harness for hallucinations, latency, and token efficiency
High-Availability Kubernetes, Containerization & OpenTelemetry
Cloud-native and on-premises containerization (Docker, Kubernetes clusters, Helm), CI/CD automation (GitLab/GitHub), and full-stack OpenTelemetry observability (OTLP, OTel Collector, Grafana Tempo, Loki, Mimir).
- High-availability Kubernetes clusters (cloud-native & on-premises), Docker containerization & Helm charts
- Full-stack OpenTelemetry distributed tracing (OTLP, OTel Collector, Grafana Tempo)
- Unified telemetry pipelines, custom alerting rules & Grafana operational dashboards (Loki & Mimir)
- Automated CI/CD build, linting & deployment pipelines (GitLab CI / GitHub Actions)
Database Architecture, Query Tuning & High Availability
High-consistency schema design, index optimization, and query tuning across PostgreSQL, MongoDB, MySQL, and MS SQL Server, engineered for both cloud-native and on-premises high availability.
- Normalized schema modeling, composite indexing & execution plan analysis
- Slow-query debugging and transaction lock contention elimination
- High-availability database clustering, replication & automated failover across Kubernetes and on-premises infrastructure
- Automated backup, point-in-time recovery (PITR) & disaster recovery validation
Deep Systems Debugging & Infrastructure Escalation
Code-level C/C++/.NET root-cause debugging (WinDbg, ETW call stacks, memory leak & dump analysis), Windows Server / Active Directory / Linux administration, and TCP/IP & SAN/NAS troubleshooting.
- WinDbg dump analysis, memory leak isolation & ETW kernel call stack traces
- High-severity production incident triage & code-level root cause remediation
- Windows Server / Active Directory DS / Linux enterprise infrastructure hardening
- Network packet capture analysis (Wireshark, TCP/IP, DNS, SSL/TLS handshake debugging)
Forward Deployed Engineering & IAM Integration
Bespoke platform engineering, OAuth 2.0 / JWT / Entra ID IAM architecture, automated background job workers, and end-to-end SDLC technical consulting.
- Custom OAuth 2.0 / JWT / Microsoft Entra ID enterprise authentication integration
- Forward-deployed on-site engineering embedding into client sprint cycles
- Background job worker orchestration with distributed locks & blackout windows
- Technical architecture review and enterprise systems integration roadmap
1-on-1 Tutoring: SAT/IGCSE Maths, Physics, CS & English
Personalized 1-on-1 tutoring in Mathematics (Extension 1 & 2, SAT, IGCSE), Physics, Computer Science & Coding Interview Prep, and C1 Conversational English.
- Customized curriculum roadmap and initial diagnostic skill assessment
- 1-on-1 interactive coaching sessions with step-by-step problem deconstruction
- SAT / IGCSE exam drills, past paper reviews & time management strategies
- Computer science fundamentals, DSA & coding interview preparation
Sports Coaching: Basketball, Swimming, Skating & Badminton
Active 1-on-1 or small-group sports coaching and mechanics refinement for Basketball, Swimming, Ice Skating, and Badminton.
- Biomechanics & movement video analysis with actionable corrections
- Custom drill progressions for shooting form, stroke efficiency, or balance
- Physical conditioning, agility drills & injury prevention guidance
- Session debriefs and progressive milestone tracking
Let's Talk Business
Interested in collaborating on a venture, exploring engineering or leadership opportunities, or discussing B2B partnerships and backend logistics? Open a direct thread to initiate a conversation.
- Direct discovery call or asynchronous executive & technical proposal review
- Full-time, contract, or advisory engineering engagement scoping
- B2B partnership, system architecture & technical due diligence alignment
- Dedicated communication thread with prioritized response
Professional History
Software Engineer
- Spearheaded a Warehouse-as-a-Service transformation, abstracting complex fulfillment and logistics workflows into standardized, high-throughput Go REST and OpenAPI platforms for seamless B2B partner onboarding.
- Architected high-performance, strongly consistent microservices in Go and Rust utilizing both event-driven choreography and workflow orchestration to synchronize critical data across enterprise distribution partners.
- Developed and maintained core internal enterprise platforms, including the IAM system (user impersonation and hybrid ABAC + RBAC access control), Workflow Engine, and HRM system.
- Integrated legacy ticketing platforms with internal IAM systems (OAuth 2.0, JWT) to automate criteria-based ticket routing and harden access control.
- Maintained and enhanced the Banking Adapter for high resiliency, reliably processing real-time bank notifications and executing automated transfer requests.
Software Engineer (Contractor)
- Established end-to-end OpenTelemetry observability (OTLP, OTel Collector, Grafana Tempo, Loki, Mimir) and memory profiling across microservices, providing real-time execution visibility and proactive anomaly detection.
- Engineered a production AI Seller Chatbot (Go, Python, LangChain, MongoDB) with RAG architecture and semantic vector search to automate merchant support and self-service issue resolution.
- Designed high-availability containerized deployments using Docker and Kubernetes clusters (cloud-native and on-premises, Helm) with automated scaling, while optimizing high-volume PostgreSQL and MongoDB schemas for consistent low-latency performance.
Technical Support Lead (Software Escalation Engineer)
- Led the escalation engineering team in architecting resilient, high-availability infrastructure—spanning containerized workloads, on-premises failover clustering, and MS SQL Always On—for mission-critical enterprise and banking environments.
- Built automated application health monitoring pipelines in Python and PowerShell to accelerate incident acknowledgement and response.
- Conducted deep-level code debugging for C/C++ and .NET services using WinDbg, ETW, and memory dump analysis to resolve root causes.
Technical Support Engineer
- Diagnosed and resolved complex server infrastructure, storage, and networking incidents for enterprise customers.
- Validated RESTful APIs and .NET Web services using Postman and custom automation scripts, cutting resolution times.
- Configured proactive observability dashboards, distributed traces, and alerting with OpenTelemetry (OTLP, OTel Collector) and Grafana (Tempo, Loki, Mimir) while troubleshooting hybrid cloud and on-premises TCP/IP networks.
Technical Arsenal
Go (Golang)
Python
Rust
Node.js
.NET Core / C#
C / C++
RESTful APIs & Microservices
OAuth 2.0 / JWT / Entra ID
Choreography & Orchestration
TypeScript
Next.js / React
Tailwind CSS
Framer Motion
WebGL / Three.js
WebAssembly (Wasm)
Generative AI & RAG
LangChain & AI Agents
Deep Learning (PyTorch / TensorFlow)
Data Analysis (Pandas, NumPy)
PostgreSQL
MongoDB
MS SQL Server
MySQL
Database Design & Index Optimization
HA Kubernetes (Cloud & On-Prem / Helm)
Docker & Containerization
OpenTelemetry (OTLP, OTel Collector)
Grafana Stack (Tempo, Loki, Mimir)
Distributed Tracing & Telemetry
CI / CD (GitLab, GitHub)
Windows Server & AD DS
Linux (Ubuntu / Red Hat)
TCP/IP, DNS, DHCP Networking
Failover Clustering & Always On
Code-Level Debugging (WinDbg, ETW)
PowerShell & Bash Scripting
Certifications & Credentials
Verified professional specializations across backend, frontend, database engineering, and artificial intelligence.
Architectural Philosophy
Distributed Services & Infrastructure
Engineering highly scalable, consistent, and high-performance distributed systems in Go, Python, Rust, C, C++, and C#. Designing both decoupled event-driven choreography and centralized workflow orchestration—from standardized API contracts to modern containerized deployments on high-availability Kubernetes clusters across cloud-native and on-premises environments.
Reliability & Deep-Level Observability
Grounding high-availability infrastructure across cloud-native and on-premises Kubernetes clusters with full-stack OpenTelemetry observability (OTLP, OTel Collector, Grafana Tempo, Loki, Mimir) to eliminate blind spots and accelerate root-cause isolation. Backed by deep networking fundamentals (TCP/IP, DNS), code-level memory and dump debugging (WinDbg, ETW), and database query optimization.
Education & Credentials
Higher School Certificate (HSC)
Majored in Mathematics Extension 1 & 2, Physics, and Engineering Studies.
Building AI Agents with MongoDB
RAG architectures, semantic vector indexing, tool-augmented LLMs, and multi-agent workflows.
Meta Database Engineer Specialization
Database modeling, transaction isolation, performance tuning, and schema architecture.
Meta Back-End Developer Specialization
Distributed APIs, microservices design, authentication standards, and Python/Django architecture.
IBM Applied Data Science & AI Engineering
Machine learning, deep neural networks, model deployment, and predictive data pipelines.
Beyond Systems & Code
Cultivating personal passions, active disciplines, and technical mentorship.
Tutoring (SAT & IGCSE Prep)
Providing personalized tutoring services in Maths & Science for IGCSE/SAT, along with Conversational English. Building student confidence and tailored learning structures.
Sports Coaching & Training
Active sports training and coaching for basketball, swimming, ice skating, and badminton. Helping individuals refine their mechanics and master active hobbies.
Culinary & Food Science
Drawing from extensive professional experience as a cook. Fascinated by food science, culinary techniques, and flavor combinations, exploring creations with molecular precision.
Vibecode & Forward Deployed Engineering
Perfecting the Vibecode app and web ecosystem. Acting as a Forward Deployed Engineer to deliver bespoke platforms, seamless integrations, and customized architectures directly into client workflows.
Writing & Ideas
Notes from the build: what Asher learns while shipping, on a blog anyone can read and anyone can apply to write on.
Opening the blog
Articles by Asher on building software, systems and the projects on this site, alongside the bloggers Asher has welcomed onto the platform.
- Asher's articles
- Guest bloggers
- Subscribe for new posts
- A chat cat that finds posts
Custom Utilities & Legacy Archives
Explore agentic automation ecosystems, real-time system analytics, and the archives of my early development portal.
Developer Utilities
Access the suite of custom agentic utilities, including CORS bypass engines, API tools, Surge controllers, and Wasm file parsers built for the tools.unrealemo.space stack.
- Agentic Autonomy: Complete system control allowing agents to perform end-to-end tasks independently.
- CORS Bypass: Direct endpoint queries to bypass cross-origin restrictions on any target resource.
- Wasm File Processing: Native client-side parser capable of processing files with hundreds of thousands of lines in milliseconds.
Legacy WP Portal
Explore historical articles, deep technical tutorials, and older architectural logs preserved from the original WordPress blogging environment.
- 15+ Technical Articles: Preserved guides covering IoT, kernel tuning, and backend APIs.