// welcome to my world
Hi, I'm Viet
Software Engineer with 6+ years of experience building and developing fintech systems, including payment gateways and e-wallet platforms. Proficient in PHP, Golang, React, and Next.js. Strong expertise in applying AI to products and systems, particularly with AI Agents, Skills, and Rules-based workflows to build intelligent automation solutions. Contributed to large-scale products with secure architectures, high-load capabilities, serving millions of users, and generating multi-million-dollar transaction revenue. Strong foundation in microservices, distributed systems, payment integration, and system optimization within highly scalable and high-availability environments.
Not afraid of difficult tasks – only afraid of having no tasks at all.
About Me
Building Products That Actually Scale
Software Engineer with 6+ years across both Product and Outsourcing environments. I've shipped fintech systems handling millions of transactions, led frontend rewrites, and built internal tooling with AI automation — always with a focus on clean architecture and real impact.
3+ yrs in Fintech — payments, e-wallets, SmartPOS
Full ownership from DB schema to pixel-perfect UI
AI-first workflow with Claude, Cursor & custom agents
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Years Experience
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Technologies
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Projects Done
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Companies
Currently
Full Stack Engineer @ AppotaPay
Open to freelance & side projects
Exploring AI Agents & automation
Tech Stack
Skills & Expertise
A curated set of technologies I've worked with across backend, frontend, AI tooling, and infrastructure — built through years of real-world product delivery.
57 technologies
Career Path
Work Experience
AppotaPay
03/2023 – PresentSoftware Engineer
Worked as a Software Engineer focusing on fintech systems, including payment gateways, e-wallets, POS machines, and CMS platforms.
- Designed and developed scalable systems following clean architecture principles
- Participated in system analysis, architecture design, and technology selection for projects
- Developed, maintained, and optimized backend/frontend systems for performance, scalability, and reliability
- Built authentication and authorization systems using Keycloak and JWT-based solutions
- Designed and implemented RESTful APIs and modern frontend applications
- Worked with high-load systems serving large-scale users and transaction volumes
- Collaborated with cross-functional teams to deliver secure and maintainable products
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Toprate
05/2021 – 03/2023Full Stack Developer
Worked as a FullStack Developer. Main field: e-learning and CMS platforms.
- Developing, maintaining, and optimizing source code
- Create Api, Implementing Frontend projects
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Viettel Post
01/2021 – 05/2021Backend Developer
Worked as a BackEnd Developer. Main field: e-learning and CMS platforms.
- Developing, maintaining, and optimizing source code
- Create Api
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Why Choose Me
My Strengths
Software Engineer with 6+ years of experience in fintech, full-stack development, and AI integration. I build secure, scalable systems that handle real-world load — and I bring both technical depth and product thinking to every project.
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Years of Experience
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Companies
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Users Served
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Transaction Revenue
Fintech Domain Expert
3+ years building core fintech products at scale.
- Payment gateway & e-wallet platforms
- SmartPOS & CMS systems & Payment link & Partner system
- Secure transaction processing at high volume
Full-Stack Engineer
End-to-end ownership from database to UI.
- Backend: PHP, Golang, Microservices
- Frontend: React, Next.js, TypeScript
- Database: MySQL, MongoDB, Redis
AI-Driven Developer
Early adopter of AI in real product workflows.
- AI Agents, Skills & Rules-based automation
- Claude & ChatGPT integration in products
- Productivity-first development with AI tools
Architecture & Scale
Designing systems built to last and grow.
- Clean Architecture, DDD, microservices
- High-load systems serving millions of users
- IAM with Keycloak, JWT & distributed infra
Recent Works
Featured Projects
Payment Gateway
Software Engineer @ AppotaPay
A solution that allows merchants to accept online payments on websites, apps, and social networks. Supports domestic cards, international cards, bank transfers, e-wallets, buy-now-pay-later, and installment payments.
Tech Stack
E-Wallet
Software Engineer @ AppotaPay
A digital wallet platform that enables users to store, send, and receive money seamlessly. Supports top-up, withdrawals, peer-to-peer transfers, and integrated payment across merchants.
Tech Stack
Smart POS
Software Engineer @ AppotaPay
An intelligent payment device designed to optimize point-of-sale operations. One compact device handles all cashless transactions — ATM cards, international cards, bank transfers, e-wallets, and mobile money.
Tech Stack