AI
PDF Chatbot
Next.jsFastAPILangChainQdrant
About
Production engineer — AI document systems, payment infrastructure, and internal SaaS platforms.
Pham Dang Truong
Software team — product delivery & AI systems
We take product ideas from spec to production. Our team has shipped payment gateways, AI document platforms, internal SaaS tools, and digital wallets — all in production, all maintained. If you have a product that needs to be built properly, let's talk.
Web appsAI toolsPayment systemsInternal SaaS
Discuss your projectProjects
Featured case studies in AI, fintech, and enterprise — more shipped work available on request.
Source-grounded answers with page citations
Commerce
Ecommerce Bot
Node.jsLangChainRedisPostgreSQL
Automation
Social Automation
n8nPythonLLM APIsMeta Graph API
Fintech
Digital Wallet
Next.jsASP.NETSQL ServerDocker
Fintech
QR Payment
Next.jsNestJSPostgreSQLRedis
Internal tool
Employee Dashboard
ReactTypeScriptNestJSPostgreSQL
Capabilities
TypeScript, Python, Next.js, FastAPI, NestJS — production-focused stack aligned with shipped products.
AI & RAG
PythonFastAPILangChainQdrantOpenAI
Commerce & APIs
NestJSNode.jsREST / WebhooksAPI securityRabbitMQ / Kafka
Fintech & Payments
PostgreSQLRedisLedger designIdempotencyAudit trails
Platforms & Ops
Next.jsReactRBACCloud nativeCI/CD
Experience
Shipped: RAG pipelines, QR payment gateway, digital wallet ledger, HR dashboard, social workflow automation.
Document AI platform
Legal team uploads contracts and gets cited answers in under 5 seconds. No more manual search.
QR payment gateway
Live payment processing with webhooks, auto-settlement, and a merchant dashboard. 3 merchants onboarded.
Digital wallet
P2P transfers with double-entry ledger and audit trail. Compliance-ready from day one.
Ecommerce AI assistant
Customer questions routed to catalog answers or handed off to staff. Reduced support load by ~60%.
HR internal dashboard
Attendance, leave approvals, and payroll summary in one tool. Replaced 3 separate spreadsheets.
Social media automation
Content scheduled across platforms with a human approval gate before posting.
Insights
Engineering notes on system design, RAG, Next.js performance, and production architecture.
From shipped projects
How we think about software
We write about decisions we made in production: why we chose certain architectures, where we got burned, what actually worked. No tutorials — just real notes from shipped projects.
RAG with citations: how we stopped hallucinations in a legal chatbot
Source-grounded answers and page references — what we changed after the first prototype failed compliance review.
Why every payment system we build uses double-entry ledger from day one
Reconciliation, idempotency, and audit trails are not optional extras — they are how you avoid losing money in production.
When NOT to add AI to your product — a checklist we use with clients
A short decision framework before you pay for embeddings, fine-tuning, or a chat UI nobody will trust.
Availability
Available for contract builds — remote, GMT+7.
Taking new projects
2–3 slots open
Focus
Web apps, AI features, internal tools
Base