Live demo
Accounting & finance
Transaction Coding Agent
Bank lines in → suggested accounts, tax codes, and confidence → accountant Approve / Edit.
Review queue with confidence scores and a full activity log.
Available for AI systems roles
AI System Specialist
Sean Nguyen
I turn messy business ideas into working software: automating manual work, connecting tools, and keeping people in control of decisions that matter.
IT foundation from TMA and DXC, then marketing systems work, now shipping n8n automation and web apps with AI coding agents.
sonnld178@gmail.com
+84 947 630 154(call or message via Zalo / WhatsApp)
Workflow agent · any department
live- WF-22140.96queued
New lead from website form
Sales · enriched, scored, routed to owner
- WF-22150.92queued
Customer email · refund request
Support · reply drafted, priority tagged
- WF-22160.89queued
Supplier invoice · PDF attachment
Finance · fields extracted, matched to PO
- WF-22170.94queued
New hire · onboarding checklist
HR · accounts created, tasks assigned
- WF-22180.41queued
Contract clause · unusual terms
Legal · flagged for human decision
Humans review the exceptions · threshold 0.85audit trail on
- HTML · CSS · JavaScript · PHP
- TypeScript · Python
- n8n orchestration
- Webhooks & APIs
- Cursor · Codex · Claude Code
- OpenAI · Claude · Grok
- Human-in-the-loop
- Multi-agent handoff
- Document extraction
- Audit trails
About
If your team has work that still runs on spreadsheets, inboxes, and copy-paste, I am the person who turns it into software people actually use.
Hand me a rough goal (automate this, control this data, launch this internal tool) and I come back with a working system: what to automate, what stays human, and how the business verifies every result.
I sit with the people doing the work, find where time and risk actually go, then ship a thin slice into the tools they already use before adding scope. Engineering fundamentals underneath, AI as the accelerator: n8n workflows, web apps, and agents that draft while people keep judgment and an audit trail.
Ships end to end
Scoping, build, integration, handover. No hand-off gaps.
Owns the outcome
Measured by hours saved and errors gone, not tickets closed.
Speaks both sides
Clear with engineers and with non-technical stakeholders.
Fast, without the mess
AI-assisted delivery with review gates and traceability.
How I turn ideas into systems
Take a vague goal, ship a usable system. This is the loop I run on every build.
- 01
Find the costly loop
Spot the manual work that burns time or creates risk.
- 02
Design the system
Define inputs, decisions, exceptions, and outputs.
- 03
Automate the draft
Agents and APIs do the volume work at scale.
- 04
Keep control
Human review, confidence gates, full audit trail.
- 05
Ship & prove value
Deliver a working slice, then measure what changed.
Systems that do real work
Click any demo to open it. See how manual work becomes software: AI drafts the work, people stay in control, and every step is easy to check.
Live demo
Accounting & financeDocument processing
Receipt & Document Agent
Upload a receipt or PDF → extract vendor, date, amount, lines → validate → exception queue.
Document intelligence with checks and low-confidence exceptions.
Live demo
Accounting & financeClient & ops
Multi-Agent RFI Desk
Missing info detected → RFI drafted → reply tracked → case updated, with escalation paths.
Multi-step handoff with shared case state and human escalation.
Live demo
HVAC & field serviceClient & ops
HVAC Call Triage Desk
Inbound “no cool / no heat” notes → urgency, skill tags, SLA window, and a customer SMS draft.
Dispatcher-ready triage suited to AU / US / PH field-service ops desks.
Live demo
Marketing & growthClient & ops
Marketing Lead Reply Agent
Form / FB / Google lead in → personalized reply, CRM tags, and next-step SLA for growth teams.
Speed-to-lead drafts with CRM hygiene — strong fit for PH BPO + AU/US agencies.
Experience
IT foundation first, then marketing systems, with AI only from 2024 onward.
2023 – Present
Freelance: Marketing systems & AI automation
Businesses of all sizes and individual clients
Build marketing automation and supporting web apps. Started applying AI to day-to-day work in 2024; from 2025–2026 heavily use AI coding agents to ship n8n workflows and usable product UIs for content and ops teams.
2020 – 2023
Web Developer
DXC Technology
Three years at a global IT services firm. Built and maintained responsive web applications with HTML, CSS, JavaScript, and PHP: structure, performance, security, UX, and basic SEO. No AI tools in this period; solid engineering foundation.
2019 – 2020
IT Engineer
TMA Solutions
First year after graduation. Software/IT delivery in a product-engineering environment: requirements, implementation discipline, and shipping working software with the team.
Skills
IT and automation first. AI entered the toolkit in 2024; AI-assisted coding and n8n systems became core in 2025–2026.
Engineering
- HTML · CSS · JavaScript
- TypeScript
- PHP
- Python
- Responsive web apps
- Performance & UX basics
Automation & orchestration
- n8n workflows
- Make.com
- Webhooks & APIs
- Google Sheets / Drive
- Event-driven flows
AI coding agents
- Cursor
- Codex
- Claude Code
- Agent-assisted delivery (2025–2026)
LLMs & agents
- OpenAI
- Claude
- Grok
- Prompt & tool use
- Multi-agent design
- Human-in-the-loop review
Systems design
- Confidence scoring
- Audit trails
- Exception escalation
- Adapter / integration patterns
Marketing systems
- Content ops automation
- Publishing preparation flows
- SEO-oriented site content
- WordPress & social tooling
Education & certificates
FPT University, Bachelor of Software Engineering
Software engineering · 2015 – 2019
Graduated 2019
English, TOEIC
Score 895 / 990
Certificate
Japanese, JLPT N4
Language certificate
Certificate
Let's build something useful
Open to roles where you need someone to turn product or ops ideas into working systems: automation, agent workflows, and integrations that teams can actually run.
sonnld178@gmail.com