Director, EYC
Phan Phúc Nguyên is the Director and legal representative of EYC. He focuses on C#/.NET and system architecture and sets the technical direction for the company's products and projects.
A technical guide to integrating the Zalo OA API in C#/.NET: OAuth v4 with PKCE, token lifecycle, typed HttpClient with retries, signed ASP.NET Core webhooks, idempotency and safe logging.
An AI agent is a system that uses an AI model to decide for itself which steps and tools to use to complete a goal. This guide covers its components, autonomy levels, how it differs from chatbots, RPA and workflows, and when a business should use one.
A vendor-neutral guide to C# socket programming for game servers and realtime systems: TCP vs UDP vs WebSocket, binary serialization, framing, low-allocation techniques in .NET, tick rate, encryption, load testing and choosing a library.
A neutral checklist for choosing preschool management software: what it must do for teachers, parents, administrators and classroom TVs, children's data criteria, integration, rollout and questions to ask vendors.
Nalix is an open-source binary networking framework for .NET 10 aimed at game servers and realtime systems. This article explains its design, security model, self-published benchmarks and when not to use it.
AI API costs are billed per input and output token. This guide explains what drives the bill up and ten ways to control it: model routing, prompt caching, batch APIs, context trimming, output limits and per-team budgets.
Why AI gives wrong answers when data is scattered across CRM, ERP and accounting software, and how to integrate step by step: sources of truth, integration patterns, error handling and Vietnamese e-invoicing under Decree 254/2026.
A practical guide to the custom software development process: 9 phases and their deliverables, contract models, what clients should prepare, acceptance criteria, source-code handover and neutral red flags when choosing a vendor.
How to choose libraries and architecture for an AI backend in C# and .NET in 2026: Microsoft.Extensions.AI, Microsoft Agent Framework, the OpenAI and Anthropic SDKs, MCP, ONNX Runtime, plus streaming, resilience, OpenTelemetry, testing and cost.
Should you buy off-the-shelf SaaS, configure a low-code platform, commission custom software or combine them? This guide gives a criteria table, questions to ask vendors, notes on source-code ownership and an exit strategy.
The 3-2-1-1-0 rule, setting RPO/RTO, ransomware-resistant copies, who backs up SaaS data, and a disaster recovery runbook checklist for small and mid-sized businesses.
Why many AI projects stall at the pilot stage, and a 10-point checklist for moving an AI application or AI Agent into real operation under control.
AI should take paperwork off adults so they have more time for children, not replace teachers in assessing or labelling children. A guide with Vietnam's 2026 legal framework and a school checklist.
A vendor-neutral guide to choosing the first workflow, setting permissions, preparing data and taking AI agents from pilot to production under Vietnam's 2026 legal framework.
How to give AI Agents their own identity, scoped permissions, approval gates and audit logs, so you know what each agent may do, what it did, and who is accountable.
How to build an AI Agent operating model: role definitions, least-privilege permissions, a RACI table for agent–human handovers, failure behaviour, and the human-control requirement in Article 4 of Vietnam's AI Law 2025.
A step-by-step guide to mapping a business process before adding AI: a checklist of trigger, step, owner, time, data and whether to automate, with an illustrative worked example.
How to choose a cloud architecture for a business with a scorecard of five constraints: data residency and law, latency and users, team skills, cost drivers, and compliance and availability.