Asher Portfolio & Services

Solving 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.

Explore Services

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).

Try it live

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

Start shopping Build your own store

Services & Offerings

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.

Engineering

~24h SLA

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.

Key Deliverables

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 & Data

~24h SLA

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.

Key Deliverables

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

Cloud & DevOps

~24h SLA

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).

Key Deliverables

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)

Databases & HA

~24h SLA

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.

Key Deliverables

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

Systems & Debugging

~21h SLA

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.

Key Deliverables

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)

Engineering

~24h SLA

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.

Key Deliverables

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

Tutoring & Mentoring

~48h SLA

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.

Key Deliverables

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

~48h SLA

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.

Key Deliverables

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

Business & Partnerships

~21h SLA

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.

Key Deliverables

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

Buymed • Ho Chi Minh City, Vietnam

07/2024 – Present

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)

Mind Supernova • Ho Chi Minh City, Vietnam

12/2025 – Present

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)

iTechwx (Microsoft Partner) • Ho Chi Minh City, Vietnam

06/2023 – 06/2024

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

iTechwx (Microsoft Partner) • Ho Chi Minh City, Vietnam

11/2022 – 06/2023

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.

PowerShell & Bash Scripting

Certifications & Credentials

Verified professional specializations across backend, frontend, database engineering, and artificial intelligence.

Meta Professional Certificate

Meta Back-End Developer

Meta Professional Certificate

Meta Front-End Developer

Meta Specialization

Meta Database Engineer

IBM Professional Certificate

IBM AI Engineering

IBM Specialization

Applied Data Science

IBM Fundamentals

Applied Software Engineering

OBSERVABLE

Using OpenTelemetry

End-to-end distributed tracing, metrics, and logs via OTLP, OTel Collector, Grafana Tempo, Loki & Mimir

SCALABLE

Choreography & Orchestration

Elastic microservices engineered for both event-driven choreography and workflow orchestration

CONSISTENT

High-Performance Core

Low-latency Go, Rust & Python systems with strict transactional integrity and fault-tolerant state

RESILIENT

Cloud-Native & On-Premises HA

Zero-downtime Kubernetes clusters, modern Docker containerization, and automated failover across cloud and on-prem

Architectural Philosophy

Distributed Services & Infrastructure

Beyond Systems & Code

Cultivating personal passions, active disciplines, and technical mentorship.

Tutoring

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

Sports Coaching & Training

Active sports training and coaching for basketball, swimming, ice skating, and badminton. Helping individuals refine their mechanics and master active hobbies.

Lifestyle

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.

Engineering

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.

The blog

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

Read the blog Start your own blog

Latest from Asher

Loading the latest post
Loading the latest post
Loading the latest post

Tools

Apps, utilities & archives

Apps that run on this site and that you can use too, plus my developer utilities and the archive of my old blog.

1Create a free account
2Open an app, or apply for one
3Approved apps appear in your workspace

Loading the apps…

Instant public labs

Interactive engineering studios

Open right away in your browser — no sign-up required.

System Lab Studio

Distributed Saga & Chaos Simulator

Compare Choreography vs Orchestration sagas step-by-step across warehouse failures, worker crashes, W3C traceparent spans, conservation proofs, and SRE postmortems.

Choreography vs Orchestration
W3C trace waterfall
SRE postmortem

Open System Lab

SceneCraft

2D Machine & 3D Scrollytelling Studio

Author interactive 2D architecture state machines and 3D WebGL stage choreography with AI Scene Director diffs, Blog scrollScene JSON export, and shareable permalinks.

2D + 3D DSL live stage
AI Scene Director diff
Blog scrollScene export

Open SceneCraft

HookLab

Public Webhook & Chaos Inspector

Provision ephemeral webhook bins in one click, stream live deliveries over SSE, audit HMAC-SHA256 signatures, diff JSON payloads, and fire outbound chaos drills.

Live SSE capture
HMAC-SHA256 verifier
Chaos replay drills

Open HookLab

MockRoom

System Design & Resume Diagnostic Arena

Benchmark Mid, Senior, and Staff architecture designs across a 5-axis rubric, run word-level XYZ/STAR resume diffs, and hand off directly to mentorship tickets or Google Meet booking.

5-axis Staff rubric
Resume XYZ word diff
Ticket & Meet handoff

Open MockRoom

Outside this site

Utilities & archives

Open to anyone, no account needed.

Developer Utilities

tools.unrealemo.space

ONLINE

Agentic utilities including CORS bypass engines, API tools, Surge controllers and Wasm file parsers built for the tools.unrealemo.space stack.

Agentic autonomy
CORS bypass
Wasm file processing

Launch Utilities Portal

Legacy WP Portal

archived.unrealemo.space

ARCHIVED

Historical articles, deep technical tutorials and older architecture logs kept from the original WordPress blog: 15+ articles on IoT, kernel tuning and backend APIs.

Failover Clustering
Hyper-V
MPIO

Explore Legacy Portal

Solving Complex Problems.Building Scalable Systems.

Opening the store

Tailored Engineering, Advisory & Coaching

Full-Stack Web & Microservices Engineering

AI Agents, RAG Chatbots & LLM Workflows

High-Availability Kubernetes, Containerization & OpenTelemetry

Database Architecture, Query Tuning & High Availability

Deep Systems Debugging & Infrastructure Escalation

Forward Deployed Engineering & IAM Integration

1-on-1 Tutoring: SAT/IGCSE Maths, Physics, CS & English

Sports Coaching: Basketball, Swimming, Skating & Badminton

Let's Talk Business

Professional History

Software Engineer

Software Engineer (Contractor)

Technical Support Lead (Software Escalation Engineer)

Technical Support Engineer

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

Meta Back-End Developer

Meta Front-End Developer

Meta Database Engineer

IBM AI Engineering

Applied Data Science

Applied Software Engineering

Architectural Philosophy

Distributed Services & Infrastructure

Reliability & Deep-Level Observability

Education & Credentials

Higher School Certificate (HSC)

Building AI Agents with MongoDB

Meta Database Engineer Specialization

Meta Back-End Developer Specialization

IBM Applied Data Science & AI Engineering

Beyond Systems & Code

Tutoring (SAT & IGCSE Prep)

Sports Coaching & Training

Culinary & Food Science

Vibecode & Forward Deployed Engineering

Writing & Ideas

Opening the blog

Apps, utilities & archives

Interactive engineering studios

System Lab Studio

Solving Complex Problems.
Building Scalable Systems.