Nirajan Karki

Expert Python Backend & AI Engineer · Full-Stack Developer

6+ yrsExperienceTotal
75+Clients Servedon Upwork
90+Projects Deliveredon Upwork
100%Job Success Scoreon Upwork

Professional Summary

Senior Python Developer and Full-Stack Engineer with 7+ years of experience architecting scalable web applications and AI-powered solutions. Expert in Python, Django, FastAPI, and modern JavaScript frameworks (React, Next.js). On Upwork, where I maintain a 100% Job Success Score, I have delivered 80+ projects for global clients, optimised complex PostgreSQL and MongoDB schemas, and integrated advanced AI technologies including GenAI, LangChain, and RAG pipelines. Across all engagements I ship production-grade code that is clean, tested, and built to last.

Selected Open-Source Projects

Automated options trading system integrated with the IG.com API, executing real-time delta hedging strategies with live position management.

PythonIG APIOptions TradingAutomation

Comprehensive full-stack finance dashboard featuring interactive income/expense analytics, responsive UI, and robust state management architecture.

TypeScriptReactFull-StackFinance

REST API service combining NLP summarisation with TTS and STT capabilities. It ingests long-form content and returns an optimized audio summary via a clean FastAPI interface.

FastAPINLPTTSSTTPython

Implements a 'Thin Agent, Fat Platform' architecture designed to bridge the gap between natural language queries and a library of 100+ frozen, deterministic quantitative functions.

PythonLLMNext.jsAI Architecture

AI-powered application that transforms photos and personal memories into beautifully written narratives using generative models.

AIGenerativeStorytellingHTML

TypeScript web app that maps Spinoza's philosophical propositions, definitions, and logical dependencies in an interactive navigable interface.

TypeScriptVisualisationInteractiveWeb

Professional Experience

Expert Python Backend & AI Engineer

Freelance at Upwork

Dec 2020 – Present · 5 yrs 2 mo
  • Architected & shipped scalable APIs / services (Django, DRF, FastAPI, Flask).
  • Delivered 80+ full-stack solutions (React / Next.js) with clean, secure code.
  • Optimised PostgreSQL + MongoDB schemas & query performance.
  • Integrated AI (OpenAI, LangChain, RAG) into chatbots & search workflows.
  • Drove reviews, CI/CD on AWS, auth / security & testing best practices.
PythonDjangoFastAPIFlaskPostgreSQLMongoDBReactNext.jsAWSLangChainRAG

Full-stack Developer

Pathway Tech and Services

Sep 2021 – Sep 2023 · 2 yrs 1 mo
  • Developed scalable Django / DRF platforms & REST APIs.
  • Integrated React / Next.js clients with robust backend contracts.
  • Improved MySQL & MongoDB performance and data models.
  • Partnered cross-team to ship features on time and to spec.
DjangoDRFReactNext.jsMySQLMongoDBAPI Design

Web Developer (Part-Time)

Merohealth

May 2020 – Oct 2021 · 1 yr 6 mo
  • Shipped full-stack features (Django, DRF, React, Next.js).
  • Maintained performance & scalability for user-facing flows.
  • Modelled relational & document data for reliability.
  • Built components powering a 10K+ user healthcare dashboard.
DjangoDRFReactNext.jsTailwindCSSMySQLMongoDB

Web Developer

Food & Beverage Nepal (Solo Developer)

Jul 2018 – Mar 2020 · 1 yr 9 mo
  • Solo-built full front & backend (Django + responsive UI).
  • Delivered core product & catalogue features via clean APIs.
  • Improved performance, accessibility & SEO visibility.
DjangoJavaScriptResponsive UISEOPostgreSQL

Technical Skills

Frontend
HTML5CSS3JavaScriptTypeScriptReactNext.jsTailwind CSS
Backend
PythonDjangoFastAPIFlaskPostgreSQLRedisDockerKubernetes
Database / Cloud
PostgreSQLMongoDBAWS (EC2 · S3 · Lambda)CI/CD
AI / ML
OpenAILangChainRAGGenAIVectorDB

Education & Training

Bachelor of Engineering (BE) in Electronics & Communications

Tribhuvan University · IOE Western Regional Campus · Pokhara, Nepal

2016 – 2021

Higher Secondary in Science

Einstein Academy · Lalitpur, Nepal

2014 – 2016

Full-Stack Web Development Bootcamp

IWA Workshop · Intensive 6-month program in Django, DRF, React, real projects, REST, auth, and deployment.

Jan 2018 – Jun 2018

Certifications

React, The Complete Guide 2024 (incl. Next.js, Redux)Udemy · Aug 2024
Build a Backend REST API with Python & Django, AdvancedUdemy · Jul 2023
REST APIs with Flask and Python in 2024Udemy · Mar 2023