12 years building production .NET systems. Fintech payment orchestration at Agoda, SaaS invoicing platforms, legacy modernization on Azure and AWS.
My work is backend-heavy full-stack. Clean C# architecture, REST APIs built to hold up under real load, and frontends in Blazor or React that don't embarrass the backend. I've owned entire codebases solo and led small teams through complex deliverables.
I'm most useful when a project is messy, stalled, or needs someone who can hit the ground running without hand-holding. Done this repeatedly on Upwork and in enterprise environments.
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⚙ Backend: .NET Core | ASP.NET Web API | EF Core | C#
🖥 Frontend: Blazor WASM | React | Redux | Angular | TypeScript
🗄 Databases: SQL Server | PostgreSQL | Redis
☁ Cloud: Azure | AWS | Azure DevOps | GitLab CI
🔗 Integrations: Stripe | Xero | FreeAgent | HMRC | Amadeus | FedEx | DHL
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If your project involves .NET, a data-heavy backend, or anything in fintech or SaaS, let's talk.
Microsoft SQL Server
ASP.NET MVC
ASP.NET Web API
C#
Microsoft Azure
ASP.NET Core
Blazor
React
Angular
FastAPI
Python
Django
Node.js
Spring Boot
Abid H.
Bangkok, Thailand
$30/hr
5.0
69 jobs
I build production AI agents, RAG systems, and workflow automation on the Large Language Models such as Claude, OpenAI, Gemini, Grok APIs. Not demos that die after the pitch meeting: systems with guardrails, human review steps, and escalation logic that run every day without babysitting.
Over the past few years I've shipped autonomous AI agents, RAG pipelines, chatbots and conversational AI workflows running live on WhatsApp, Instagram, and Line, plus full AI-native products: web apps, custom CRMs, and analytics dashboards designed around LLMs from day one instead of having AI bolted on later. Everything in TypeScript/Node.js or Python, deployed on GCP and AWS.
One recent build: a contract analysis pipeline for the music industry. Specialized agents for Producer, Mixer, Featured Artist, and Publishing deals run under a LangGraph supervisor on Cloud Run. Document review that took hours per deal now takes minutes.
Problems clients bring me:
- Business process automation: lead capture and qualification, CRM updates, email and document processing, wired together with n8n, custom code, and LLM APIs. Anything that writes to your real data goes through an approval step first.
- Customer-facing chatbots and support agents on WhatsApp, Instagram, Line, and web, with real memory, answers grounded in your own knowledge base so they don't invent things, and clean handoff to a human when confidence drops.
- AI agents and multi-agent systems for workflows too complex for a single prompt, built on LangGraph and the Claude Agent SDK.
- RAG pipelines and semantic search at production scale with Pinecone, PGVector, and ChromaDB.
- CRM and ERP integrations: GoHighLevel, Follow Up Boss, Gmail and Google Workspace, third-party APIs.
- AI-native SaaS end to end. I built and shipped ReserveNova, an AI booking platform for hospitality.
- Document intelligence: contract analysis, invoice and data extraction, real-time LLM-powered dashboards.
How I work is simple. I scope the architecture before writing a line of code, get you a working prototype within 48 to 72 hours so you can validate direction early, then build toward production with proper error handling, evaluation, logging, and observability. Everything runs in your accounts, documented well enough that your team can maintain it without me. You own it all at handoff.
My background runs deeper than the LLM wave: years of hands-on NLP work with transformers and spaCy before agents became the trend. That's why my pipelines handle messy real-world language instead of breaking on it.
Stack: TypeScript/Node.js, Python, React/Next.js, Claude API, OpenAI API, LangGraph, LangChain, LlamaIndex, CrewAI, MCP, Pinecone, PGVector, ChromaDB, n8n, GCP Cloud Run, AWS Lambda, Docker.
I keep my project load small so each build gets real attention. If you're building an AI product from scratch, adding agents or RAG to an existing app, or drowning in a document-heavy workflow, send an invite and tell me what you're trying to build. I'll tell you honestly whether it's a fit.
Keywords:
AI Agent Engineer, AI Agent Developer, Agentic AI, AI Automation Engineer, AI Automation Developer, AI Engineer, AI Developer, LLM Engineer, LangChain Expert, LangChain Developer, LangGraph Expert, LangGraph Developer, RAG Engineer, n8n Expert, n8n Developer, n8n Automation, n8n Workflow Builder, AI Workflow Automation, AI Workflow Builder, AI Integration Engineer, AI Solutions Engineer, Multi-Agent Systems, MCP Developer, OpenAI API, Claude API, Gemini API, Python, FastAPI, Vector Database, Pinecone, Qdrant, PostgreSQL, API Integration, Business Process Automation, AI Chatbot Developer, AI Assistant Developer, Prompt Engineering
Python
AI Agent Development
LangChain
AI App Development
Claude
OpenAI API
Artificial Intelligence
System Automation
n8n
Prompt Engineering
Retrieval Augmented Generation
Large Language Model
API Integration
Automation
Automated Workflow
Chatbot Development
Business Process Automation
Conversational AI
AI Development
Zapier
Igor P.
Bangkok, Thailand
$35/hr
5.0
39 jobs
I'm a Senior Backend-Oriented Full-Stack Developer with 15+ years of commercial experience. I specialize in building MVPs, SaaS platforms, business systems, APIs, integrations, and scalable backend architecture.
I've already delivered 3 MVPs from scratch - from idea, technical planning, database structure, and backend architecture to frontend implementation, deployment, and production support.
My core strength is backend development with TypeScript, Nest.js, Node.js, PostgreSQL, Redis, Next.js, RabbitMQ, BullMQ, REST APIs, microservices, authentication, monorepo, queues, background jobs and third-party integrations.
I can help you:
- turn an idea into a clear technical plan;
- design the backend architecture and database;
- build a clean and scalable API;
- implement the frontend when needed;
- integrate external services;
- deploy the product to a server;
- support and improve the product after launch.
Core stack:
Node.js, TypeScript, Nest.js, Next.js, Express.js, Fastify, React, PostgreSQL, MySQL, Redis, BullMQ, RabbitMQ, Docker, AWS, Prisma, Sequelize, Drizzle, PHP, JavaScript
I don’t just write code - I build working products with reliable backend foundations.
TypeScript
Node.js
React
Next.js
ExpressJS
CodeIgniter
PHP
API Development
Fastify
AI Builder
REST API
Websockets
SQL
JavaScript
Tailwind CSS
Kanok S.
Bangkok, Thailand
$35/hr
5.0
1 jobs
I help companies build reliable web & mobile applications where data accuracy, scalability, and long-term stability truly matter.
Senior Full-Stack Engineer & Software Architect — 10+ years delivering SaaS, ERP, and AI-enhanced business systems from architecture to production.
** Featured Projects & Track Record **
I don't just list technologies — I ship production systems.
• BeverageVision AI — Automated inventory tracking using AI Computer Vision (YOLO11) + ERP sync
• Mezzo Translation — Real-time voice translation app (WebSocket, STT, cloud backend)
• SmartESM — AI-powered enterprise helpdesk with intelligent agents and LLM-driven ticket workflows
• AI Building Inspector — Offline-first React Native app with Gemini AI Vision, GPS tracking, and Stripe payouts for field teams
• Enterprise SFA & eOrdering — Field sales platform with multi-tier pricing, real-time stock sync, and direct ERP integration for 500+ SKU distributors
...and 10+ more production systems.
➡ Check my Portfolio section below, or message me to see full architecture flows and case studies.
** Core Stack **
• Frontend: React, Next.js, TypeScript, Tailwind CSS, WebSocket, React Query, Zustand
• Mobile: React Native, Expo, iOS, Android , GPS, Offline Sync, Push Notifications, Camera APIs
• Backend: Node.js, NestJS, Express, FastAPI, Python, REST, GraphQL, WebSocket, Microservices, Serverless, API Design, ERP Integration, Payment Systems, Authentication & Authorization
• AI & Vision: OpenAI API, Claude API, Google Gemini, YOLO11, LangSmith, RAG, Vector DBs, Computer Vision, LLM Agents, Prompt Engineering, AI Workflows, Agent Orchestration, AI-augmented software design, AI-assisted development
• Data: PostgreSQL, SQL Server, MongoDB, Supabase, Redis, Elasticsearch, Data Warehousing, ETL, Data Pipelines, Analytics
• Infrastructure: AWS, Docker, CI/CD, Stripe, RabbitMQ / Kafka, Serverless, Terraform , Cloudflare, Vercel
** How I Work **
Every project starts with an architecture doc — so you're never left guessing how the system actually works.
📩 Got a complex project? Let's talk architecture.
Redis
Web Development
Mobile App Development
React
React Native
NodeJS Framework
Next.js
SQL Programming
Microsoft SQL Server
PostgreSQL
MariaDB
MongoDB
MERN Stack
SaaS Development
CI/CD
Sai Myo M.
Bangkok, Thailand
$5/hr
5.0
2 jobs
Full-Stack Developer with 2+ years of experience building scalable web and mobile applications. I specialize in high-performance web platforms (Next.js), mobile apps (React Native), and backend services (Golang & Node.js).
I enjoy solving performance challenges, implementing clean and maintainable code, and collaborating with cross-functional teams. With hands-on exposure to cloud environments (AWS, Linode) and modern development practices, I aim to deliver products that are reliable, user-focused, and built to scale.
Always eager to learn and grow, I’m open to opportunities where I can contribute to impactful projects and innovative teams.
Skills & Tools
Frontend: Next.js, React.js, React Native
Backend: Golang, Nodejs, Hasura
DevOps: Docker, Kubernetes, GitHub Actions, CircleCI
Database & Caching: PostgreSQL, Redis
Cloud & Storage: AWS S3, Linode
Version Control: Git, GitHub
Other Tools: Lens, GitHub Projects
Next.js
Golang
React
React Native
TypeScript
JavaScript
Git
Tailwind CSS
Ilia S.
Bangkok, Thailand
$50/hr
4.9
73 jobs
Fullstack developer with 10+ years of experience in core areas of expertise, complemented by a strong understanding and hands-on experience in related fields, ranging from DevOps to C# development for AR/VR applications in Unity
My main tech stacks are:
● Nest.js, Fastify, Node.js. Understanding of service-oriented architecture and microservices design patterns.
● React, React Native, Next.js. Experience using different approaches of state management on frontend: Redux, Recoil, Apollo GraphQL. Understanding design patterns in React
● DevOps: Docker, Kubernetes, Ansible, AWS and Azure deployment, Traefik, Keycloak, Terraform, Grafana and Prometheus, Cloudflare, Netlify, CircleCI and so on
● Good experience with BaaS: Hasura, Supabase, Amplify, Firebase, Auth0
● PostgreSQL, Redis, MongoDB, ClickHouse
● Ruby on Rails (4 years of production experience in the past)
● Winner of ETHOnline 2021 official hackathon. Experience of working with Ethereum blockchain and NFT
My working history starts in 2014 since that time I have worked in many teams from startups to big enterprise companies. During that time I was always thirsty to learn and try new things, new tech stacks, and understand different approaches of development. I often had to take on the roles of both developer and project manager, which helped me learn not only how to write clear, maintainable code, but also how to set up suitable workflows, automate processes, and make the development sprints transparent and predictable.
I'm a self-disciplined and self-managed productivity hacker who loves to make new things people want.
Feel free to contact me.
JavaScript
Elixir
Node.js
AngularJS
Ruby on Rails
Vue.js
CSS 3
React
Redux
Phoenix
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