Nguyen Duy Sy - Vincent CV

Professional Summary

Senior Backend & Smart Contract Engineer with 6+ years of experience and an entrepreneurial mindset. Proven track record in building scalable Web2 & Web3 products from 0 to 1, combining deep technical expertise in NestJS, Rust, Python, and Solidity across EVM, Cosmos, Solana, and Hedera. Contributed to 15+ production projects, specializing in high-performance backends, microservices, smart contracts, and modern cloud infrastructure.

Work Experience

Senior Backend & Smart Contract Engineer

2023 - Present

VAR META Company

Architected and delivered diverse blockchain ecosystems, including decentralized Academy platforms, high-throughput Payment Gateways, DeFi protocols, and GameFi applications.
Engineered high-performance backends using NestJS and Rust (Axum), optimized for low-latency blockchain transaction indexing and event monitoring.
Developed and deployed production-grade smart contracts (Solidity, Rust) across EVM, Cosmos, Solana, and Hedera.
Consulted with international clients to translate complex business requirements into scalable technical architectures.
Optimized system scalability, achieving an 80% reduction in API latency and 30% savings in infrastructure costs.
Utilized AI-assisted & Sub-agent workflows (OpenCode, GitHub Copilot, GenAI APIs) to accelerate microservice architecture design and boost engineering velocity.

Technical Founder & Venture Builder

2025 - Present

KingOfShiba Lab (Personal R&D)

Driving 0-to-1 development of innovative Web3 ventures, identifying market gaps and building high-impact decentralized solutions.
Architected immutable cloud infrastructure using Talos OS, Terraform, and K8s, achieving a 70% cost reduction through aggressive resource optimization.
Executing Rapid Proof-of-Concepts (PoCs) to validate emerging Web3 trends, focusing on smart contract security and sustainable tokenomics.
Committed to continuous innovation, leveraging a "fail fast, learn fast" approach to validate new business models and technical frameworks.

Backend & Smart Contract Engineer

2022 - 2023

NCC Asia Company

Developed full-stack Web3 modules for NFT marketplaces, decentralized music streaming, and DeFi Swap platforms using NestJS and Solidity.
Authored smart contracts for Automated Market Makers (AMM), staking mechanisms, and dynamic NFT minting protocols.
Designed microservices-based RESTful APIs and integration layers to support seamless cross-chain operations and high-concurrency user traffic.

Full-stack Developer (Independent Contractor)

2019 - 2022

Developed and launched custom web applications, marketing automation tools, and automated crypto trading/indexing scripts for startup clients.
Engineered scalable microservices and RESTful APIs using NestJS, Django (Python), Node.js, and AWS Serverless (Lambda, SQS, Cognito, SES).
Implemented real-time data ingestion pipelines, WebSocket event listeners, and payment gateway integrations with high uptime and reliable database indexing.

Technical Skills

Backend Development

NestJS, Axum (Rust), Django (Python), Node.js, Microservices, RESTful APIs, gRPC

Blockchain & Smart Contracts

Solidity, EVM, Cosmos, Solana, Hedera, DeFi Protocols, Smart Contract Security

AI Tooling & Integration

AI Sub-agents & Workflows (OpenCode, GitHub Copilot), LangChain, LLM API Integration

DevOps & Infrastructure

Kubernetes (Talos OS), Helm, Terraform, Docker, CI/CD, Traefik, IaC

Databases & Cloud

PostgreSQL, Redis, AWS (SQS, SES, Cognito, Aurora)

Frontend (Working Knowledge)

React.js, Next.js, React Query, Zustand

Key Projects

CatStation (2026)

Tech Lead | Production App

IoT & 24/7 live camera cat charity platform with AI recognition, WebRTC & remote feeding

Hội Nhà Nông (2026)

Technical Founder | Production App

High-tech sustainable agriculture platform integrating AI & IoT algorithms for local farmers

Kaiko Studios (2025)

Backend Developer | Team of 8

LLM emotion analysis SaaS on AWS using Lambda, SQS, Aurora (60k+ users)

Bitkub Academy (2024-25)

Developer | Team of 25

Learn-to-earn educational platform with Solidity, NestJS, SSO

Playbux & Vaporfund (2023)

Developer | Team of 10

GameFi, Restaking & RWA platforms using Solidity, NestJS, Axum (40k+ users)

Hedera SaaS (2024)

Backend Developer | Team of 12

Zero-fee SaaS backend with NestJS, Hashgraph SDK, GitHub Actions

Hedera Hackathon (2024)

Developer | Team of 5 | 3rd Place Winner

DeFi borrow-lend app with Solidity, NestJS, Hashgraph SDK

Velo Lab - Orbit Payment (2023)

Backend Developer | Team of 6

Blockchain payment gateway with secure transaction flows

Education

B.S. in Information Technology (Software Engineering)

Vietnam-Korea University of Information and Communication Technology | 2018 - 2022

Languages

Vietnamese (Native) | English (Intermediate - Technical conversations & async collaboration)