Available for new projects

Munkhjin Nyamdorj

Senior full-stack developer with 7 years of experience in web application development, API integration, and system building. Experienced in React, Node.js, and building complete SaaS applications from initial version to production use with thousands of users.

Start a ProjectWhat I Do
Munkhjin Nyamdorj - Full-Stack Developer
Services

What I Can Do for You

Contract-based development work. I build complete systems based on your business requirements — from architecture to production.

SaaS Product Development

End-to-end product builds from initial concept through MVP to production with thousands of active users. Full architecture, development, and deployment.

ReactNext.jsNode.jsAWSPostgreSQL

AI Integration & Automation

Custom AI agents, chatbots with tool calling, retrieval-augmented generation systems, and workflow automation connecting to hundreds of third-party services.

OpenAIAnthropicRAGMCPLiteLLM

API Design & Integration

REST and GraphQL API development, third-party service integrations, payment systems, data pipelines, and automation tools for business workflows.

GraphQLRESTBinance APIPuppeteer

Frontend Architecture

React and Next.js application development, performance optimization, UI/UX implementation, and front-end architecture redesigns with measurable results.

ReactNext.jsTailwind CSSTypeScript
Have a project in mind? Let's talk.
About Me

Senior Full-Stack Developer

Senior full-stack developer with 7 years of experience in web application development, API integration, and system building. Experienced in React, Node.js, and building complete SaaS applications from initial version to production use with thousands of users. Strong background in system design, third-party integrations, front-end development, and cross-functional collaboration between engineering and product teams.

Skills & Technologies

Languages

GoJavaScriptPythonSQLTypeScriptPine Script

Frameworks & Libraries

GraphQLNext.jsNode.jsPrismaReactTailwind CSS

Tools & Platforms

AWSAnthropic APIBinance APIDockerGitLiteLLMMongoDB AtlasOpenAI APIVercelOpenStack

Databases

MongoDBMySQLPostgreSQL

Other

Agile developmentAPI design and integrationBlockchain

Full-Stack SaaS Builder

End-to-end product launches from initial version to production use with thousands of active users.

System Design

Strong background in system design, third-party integrations, and front-end development.

API Integration

Built automation tools connecting 250+ third-party applications and multiple external APIs.

Cross-Functional

Collaboration between engineering and product teams to drive outcomes from concept to production.

Work Experience

Where I've Worked

Lead Software Engineer

November 2023 – April 2026

Mazaal AI

• AustraliaFull-time
  • Worked in a team of 2 engineers to build and launch the main product, growing it from 0 to 5,000 active users in 7 months.
  • Redesigned the front-end architecture and API layer, reducing client-side errors by 90% and enabling direct workflows for model training.
  • Led the product launch and contributed to subscription negotiations with major retail partners.
  • Built automation tools that connect to 250+ third-party applications.
  • Developed a coding assistant with multi-platform chatbot support, custom API endpoints, and retrieval features.
  • Created a chat interface with support for tool usage and external API connections.
ReactNode.jsTypeScriptAWS

Full-Stack Developer

October 2022 – October 2023

Ipsun Sunvoy

Full-time
  • Built and maintained landing pages with blog functionality and integrated 5+ third-party solar inverter APIs and CRM systems to improve data flow between customer and internal teams.
  • Created a scraping system using Puppeteer that extracts data from hidden APIs and generates monthly screenshot-based reports for 50+ clients, reducing manual effort by approximately 15 hours per month.
  • Developed a management tool for solar installers to track customers and devices, supporting 30+ installers and 500+ customer accounts.
  • Fixed 40+ production issues, added unit tests, and improved performance in key areas.
ReactNode.jsPuppeteerAPI Integration

Mid-Level Full-Stack Developer

January 2021 – October 2022

Fibo Global

Full-time
  • Contributed to the development of cloud.mn, a cloud infrastructure service used by Mongolian tech companies.
  • Built a paid blogging platform that rewards authors based on article quality.
  • Developed an internal tool for tracking projects, tasks, and working hours.
  • Updated and modernized legacy landing pages.
ReactNode.jsMongoDBDocker
Side Projects

Things I've Built

Personal projects and side ventures I've built from the ground up.

February 2026
Convex
Side Project

A multi-channel messaging platform that unifies Facebook Messenger, Instagram, Viber, and other services into one inbox for businesses to manage customer conversations.

ReactNode.jsMulti-Platform
August 2023
Puck Finance
Side Project

Built an API to connect TradingView signals to the Binance API for automated futures trading. Integrated a Discord bot for trade tracking, balance monitoring, and profit/loss reporting. Currently used for personal automated trading.

GoTradingAPIDiscord
Education

Education

Bachelor's Degree in Computer Science

National University of Mongolia

Ulaanbaatar, Mongolia • January 2016 – January 2020

Credentials

Certifications

Certified Blockchain Expert

Blockchain Council • April 2022 – Present

AWS Certified Solutions Architect

AWS • July 2021 – July 2024

Get in Touch

Tell me about your project.

I'm available for contract work building systems end-to-end based on your business requirements. Whether you need a SaaS product built from scratch, AI integrations, or API development — let's talk.

hello@munkhjin.xyz
Remote