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Tapan P.
$32/hr
100% Job Success
$100K+ earned
Available now
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As a Top Rated Plus Python Full stack developer, I help startups and product teams bring backend-heavy, modern web applications to life. My work spans from product ideation and architecture to automation, AI integration, and ongoing performance tuning. My stack includes Python (FastAPI, Django, Flask), React, Next.js, NestJS and AWS, enriched with scalable data pipelines, monitoring, and automation tools. With over 9+ years of experience and a 100% Job Success Score, I’ve led and delivered more than 40 web apps and five large-scale platforms with high concurrency. ✅ A tech Partner from Architecture to Deployment. Clients work with me because I don’t just code features, I architect scalable, cloud native systems that require minimal oversight. ✔️ Backend: Python, FastAPI, Django, Flask, NestJS, REST APIs, PostgreSQL, MongoDB, Redis ✔️ Frontend: Next.js, React, Tailwind CSS, SSR/CSR, reusable UI libraries ✔️ Cloud: AWS (Lambda, EC2, S3, Step Functions), Docker, GitHub Actions ✔️ Automation & AI: OpenAI API, Langchain, LLM, Make, Zapier, n8n, RAG Agents, AI Agents, Generative AI I’ve also led and mentored engineering teams up to 45 developers, helping deliver across sprints while balancing performance, timelines, and quality. 🏆 Highlighted Work & Outcomes ✔️ Scalable API Infrastructure (Python, FastAPI) Refactored a high-load backend to handle massive traffic spikes using FastAPI, Redis caching, and PostgreSQL. Supported mission-critical uptime for end users. ✔️ Retention-Driven Feature Delivery. Built backend features that improved session time and user retention in a high-growth mobile app com, bining Redis-based response optimization with async jobs. ✔️ AI Feedback Engine with OpenAI API. Built a GPT-driven evaluation engine for a learning platform. Reduced manual grading efforts and added dynamic feedback for students. ✔️ Cloud Automation & ETL Pipelines. Designed serverless pipelines using AWS Lambda and Step Functions to transfer and transform millions of files with isolated, scalable logic. ✔️ Monitoring & SLA Tools Integrated ELK stack, Grafana, and PagerDuty into production systems to track uptime, detect anomalies, and support SLAs for enterprise clients. ✔️ Frontend Engineering (React + Next.js) Built fully responsive interfaces using React and Next.js, optimizing for performance and API sync with FastAPI-based backends. 🎯 Technical Stack & Core Skills ✔️ Languages & Frameworks Python, FastAPI, Django, Flask, Node.js, JavaScript ✔️ Frontend React.js, Next.js, TailwindCSS, PWA, SSR/CSR ✔️ Backend & Databases RESTful APIs, OAuth2, PostgreSQL, MongoDB, Redis Celery/RQ task queues, ETL pipelines, and background jobs ✔️ Cloud & DevOps AWS Lambda, EC2, S3, Step Functions, EventBridge, CloudWatch, Supabase Docker, GitHub Actions, CI/CD pipelines ✔️ Automation & AI OpenAI API, Langchain, GPT-4/4o, Prompt Engineering RAG pipelines, Agent flows, n8n, Zapier, Make com, Webhooks ✔️ Monitoring & Performance ELK, Grafana, New Relic, PagerDuty Async processing, caching, load testing, and SLA compliance 🎯 Domains I’ve Worked In ✔️ FinTech: Built backend APIs, fraud prevention, trading platforms in Python, FastAPI, Django, Celery, grafana, AWS. ✔️ EdTech: GPT integrations, adaptive learning tools using FastAPI, GPT API, Langchain, n8n ✔️ LegalTech: Scalable OCR + NLP processing using TensorFlow, Custom pipelines, Vector database storage ✔️ SaaS: Multi-tenant platforms, automation systems using React, Python, Next.js, Nest.js, AWS, FastAPI, Stripe, Oauth. 🎯What Sets Me Apart ✔️ Proven experience delivering complex platforms from scratch ✔️ 15M+ user databases, multi-cloud infrastructure, scalable patterns ✔️ Balanced blend of backend depth and frontend precision ✔️ End-to-end ownership: architecture, infra, dev, monitoring Let’s Build Something That Scales If you’re looking for a developer who can own the backend, integrate AI, and bring reliable systems to life, I’d love to collaborate. Send me an invite and let’s take your product to the next level.
Tapan P. has worked .
Shivam S.
$30/hr
95% Job Success
$200K+ earned
Available now
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I help founders, startups, and growing businesses build reliable AI-enabled SaaS products, automation workflows, CRMs, marketplaces, and custom business platforms. I’m Shivam, a Top Rated senior software engineer and technical lead with 16+ years of experience, $200K+ earned on Upwork, and 18,000+ hours delivered across production software projects. My strength is not just writing code. I understand product flow, backend logic, data movement, user roles, integrations, edge cases, and the business process behind the software. That matters because most AI and SaaS projects fail for practical reasons: unclear workflows, weak architecture, poor data handling, unreliable integrations, or features that work in demo but break in real use. I can help with: - AI workflow automation using OpenAI, Claude, GPT, n8n, Make, and custom APIs - Python and FastAPI backend development - React dashboards, portals, admin panels, and internal tools - SaaS MVP development from idea to production - CRM, marketplace, and business workflow platforms - API integrations, database design, and backend architecture - Existing product improvement, rescue, modernization, and performance fixes - RAG systems, AI assistants, document workflows, and AI-enabled reporting I have worked across Python, Node.js, React, PHP, Ruby on Rails, databases, APIs, and cloud-based systems. I’m comfortable joining early-stage product discussions, reviewing architecture, clarifying scope, and then building the right technical foundation. Clients usually work with me when they need someone who can think beyond tickets, communicate clearly, and take ownership of the technical direction. A few relevant areas I can support: - AI lead qualification and follow-up automation - AI assistants connected to business data - SaaS MVPs with secure backend and clean frontend - CRM and workflow automation - API-heavy dashboards and internal tools - Legacy system modernization - Complex backend logic and scalable architecture My approach is simple: understand the business problem first, design the right technical flow, then build something practical, maintainable, and useful in the real world.
Zestminds
Associated with
Zestminds
$400K+
earned
Volodymyr D.
$27/hr
100% Job Success
$10K+ earned
Available now
Offers consultations
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Welcome 👋I am an experienced web developer who is passionate about delivering successful projects and has a track record of delivering them 🚀 🔑Key points about me: - Expert web developer with over 4 years of experience developing complex web applications. - Good communicator, with experience managing and leading development teams. - I have an entrepreneurial mindset and a product-oriented mindset, I enjoy not just writing code, but making projects successful. - A full-fledged developer, although I prefer the back-end. - Deep understanding of OOP, design patterns, domain-oriented design. - Specializes in React, Python, TypeScript, Flask, Django, FastAPI, WEB3 - Ability to write complex and efficient database queries, optimizing the site's performance. Knowledge of NoSQL (MongoDb), SQL(Postgresql, MySQL, SQLite). - Algorithms and Data Structure, Catching(Redis) - Experience with asynchronous messaging/queue processing. - Worked with many APIs such as Stripe, Saferpay, Twilio, Cronofy, Sendgrid, Hubspot, Zapier, Viva, PayPal and more. 💻When programming, I use industry best practices to achieve the best results; I consider myself a talented programmer. I am detail-oriented, my code is always well-commented, clean and easy to understand. I am also a quality-oriented developer and my code is always well-tested. I am able to plan, execute, test and launch projects. I am a self-starter who can see things through to the end. I am passionate about building great projects and helping companies succeed. Feel free to message me to discuss your project and make it a success!🚀🚀🚀
Volodymyr D. has worked .
Janak V.
$20/hr
97% Job Success
$7K+ earned
Available now
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TOP RATED ELITE Freelancer on Upwork with 6+ years of experience building scalable web applications, AI-powered platforms, automation systems, and cloud-native solutions for startups and enterprises. I specialize in combining AI, backend engineering, data workflows, and modern frontend technologies to develop reliable, production-ready, and business-driven software solutions. I help businesses automate workflows, build intelligent AI systems, develop scalable SaaS platforms, and launch high-performance applications faster with clean architecture and performance-focused development. What I Bring to Your Project - End-to-end product development from architecture to deployment - AI-powered applications and intelligent automation systems - Scalable backend APIs and microservices - Modern, responsive frontend applications - Data engineering, ETL pipelines, and workflow automation - Cloud deployment, DevOps, and infrastructure optimization - Clean, maintainable, production-ready code - Fast communication and reliable delivery Core Expertise: 1. Python Backend Development - FastAPI, Django, Flask - REST APIs & Webhooks - Microservices Architecture - Authentication & Secure Backend Systems - API Integrations & Third-Party Services - Automation Scripts & Backend Optimization - Scalable System Design 2. Data Engineering & Data Processing - ETL Pipelines & Data Automation - Data Processing & Transformation - Vector Databases (Pinecone, ChromaDB, Weaviate, FAISS) - PostgreSQL, MongoDB, DynamoDB - Workflow Automation & Data Synchronization - Intelligent Document Processing - Semantic Retrieval Systems 3. Front-End Development - React.js, Next.js, Vue.js - TypeScript & JavaScript (ES6+) - Responsive UI/UX Development - Frontend Performance Optimization - API Integration & State Management 4. AI Engineering & Generative AI - OpenAI, GPT-4, Claude, Gemini, LLaMA, Mistral - AI Agents & Autonomous Workflows - LangChain, LangGraph, AutoGen - Conversational AI & AI Chatbots - RAG (Retrieval-Augmented Generation) - Semantic Search & Vector Databases - AI Automation & Intelligent Workflows 5. AI SaaS Development: - RAG (Retrieval-Augmented Generation) - AI Voice Agents & Real-time AI Systems - Semantic Search & Vector Databases - AI Automation & Intelligent Workflows - Text Processing, Summarization & Data Extraction 6. Cloud & DevOps - AWS (EC2, Lambda, S3, CloudFront, DynamoDB) - Docker & CI/CD Pipelines - Serverless Applications - Deployment Automation - Scalable Cloud Architecture AI Tools & Technologies - Vector Databases: Pinecone, ChromaDB, Weaviate, FAISS - AI & LLMs: OpenAI, GPT-4, Claude, Gemini, LLaMA, Mistral - AI Frameworks: LangChain, LangGraph, AutoGen, PyTorch, TensorFlow - Automation: n8n, Make, Zapier, Airtable, Notion - Voice AI: Twilio, Deepgram, ElevenLabs, VAPI, Cartesia I focus on building scalable, AI-driven, and enterprise-grade solutions that create measurable business impact. I value clean architecture, performance optimization, scalability, and long-term maintainability in every project. If you are looking for a developer who understands both engineering and business requirements and can deliver reliable, scalable, and AI-powered solutions, I would be happy to help bring your project to life.
Janak V. has worked .
OnGraph Technologies Private Limited
Associated with
OnGraph Technologies Private Limited
$10M+
earned
$28/hr
89% Job Success
Available now
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I help startups and businesses build reliable backend systems, automation workflows, and scalable web-scraping solutions using Python. With 5+ years of experience, I specialize in FastAPI, Django, APIs, browser automation, and large-scale data extraction systems. I build production-ready solutions that save time, automate repetitive work, and handle real-world scale. What I can help with ✔ Python backend development (Django, FastAPI) ✔ REST API development & third-party integrations ✔ Web scraping & browser automation (Playwright, Selenium, Scrapy) ✔ OpenAI & AI workflow integrations (LangChain, OpenAI API) ✔ Automation bots, data pipelines & scheduled jobs ✔ PostgreSQL, MySQL, Docker & AWS deployment Recent work • High-scale scraping systems extracting thousands of records daily • Automation tools that reduced manual work through workflow automation • AI-integrated business systems and internal tools • Secure APIs and backend systems for SaaS platforms Why clients hire me • Fast, clear communication and reliable delivery • Maintainable, production-focused code with clean architecture • Practical problem-solving and strong debugging skills • Long-term support and scalable architecture mindset Ready to start? Message me with a short project brief (data source, scale, and timeline). I’ll reply within a few hours.
Arun K. has worked .
Mohsin R.
$40/hr
93% Job Success
$100K+ earned
Available now
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Top Rated Plus with 10+ years of experience, $100K+ earned on Upwork, 3000+ Upwork hoours I specialize in turning business problems into production-ready systems using Python, Node.js, React, and modern AI infrastructure. Whether you need an intelligent backend, a polished frontend, or the full product end-to-end, I design and ship systems that real users can actually depend on. On the AI side, I build RAG pipelines, LLM agents, AI automation workflows, and document processing systems using OpenAI, Claude, Gemini, LangChain, LangGraph, vector databases, and embedding-based retrieval. I've delivered KYB verification workflows, AML data systems, AI file organization tools, AI-powered construction estimation, and ETL pipelines connected to real business data. On the full stack side, I build production backends with Python/FastAPI and Node.js/Express, and production frontends with React and Next.js — connected to PostgreSQL, MongoDB, REST APIs, CRMs, and cloud infrastructure on AWS with Docker. I don't outsource the frontend or treat it as an afterthought. I build the full product. What I can build for you: RAG chatbots trained on your private business data LLM agents with tools, memory, multi-step workflows, and guardrails AI automation systems connected to your APIs, CRMs, databases, and dashboards Python/FastAPI and Node.js backends for production AI applications Full stack SaaS products with React, Next.js, FastAPI, Django, PostgreSQL, MongoDB, Docker, and AWS AI document processing, OCR, data extraction, and structured output pipelines Web scraping and ETL systems at scale OpenAI, Claude, Gemini, Ollama, LangChain, LangGraph, and vector database integrations My edge is the full picture. I understand the business problem, design the data layer, build the AI workflow, expose it through a clean API, and wire it up to a frontend your users can actually use. No handoffs. No gaps between layers. If you need someone who can own the entire stack and ship a reliable, maintainable product — let's talk.
Mohsin R. has worked .
Ashutosh Singh R.
$20/hr
97% Job Success
$100K+ earned
Available now
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I am an AI-focused Full-Stack Developer with expertise in Python, scalable architectures, and enterprise-grade automation solutions, backed by 6+ years of experience building scalable web applications, AI-powered platforms, automation systems, and cloud-native solutions for startups and enterprises. I help businesses automate workflows, build intelligent AI systems, develop scalable SaaS platforms, and launch production-ready applications faster with clean architecture and performance-focused development. I specialize in combining AI, backend engineering, data workflows, and modern frontend technologies to create reliable, scalable, and business-driven solutions. What I Bring to Your Project - End-to-end product development- from architecture to deployment - AI-powered applications and intelligent automation systems - Scalable backend APIs and microservices - Modern, responsive frontend applications - Cloud deployment, DevOps, and performance optimization - Clean, maintainable, production-ready code - Fast communication and reliable delivery Core Expertise: 1. Python Backend Development - FastAPI, Django, Flask - REST APIs & Webhooks - Microservices Architecture - Authentication & Secure Backend Systems - API Integrations & Third-Party Services - Automation Scripts & Backend Optimization - Scalable System Design 2. Data Engineering & Data Processing - ETL Pipelines & Data Automation - Data Processing & Transformation - Vector Databases (Pinecone, ChromaDB, Weaviate, FAISS) - PostgreSQL, MongoDB, DynamoDB - Workflow Automation & Data Synchronization - Intelligent Document Processing - Semantic Retrieval Systems 3. Front End Development - React, Next.js, Vue.js - TypeScript & JavaScript (ES6+) - Responsive UI/UX Development - Frontend Performance Optimization - API Integration & State Management 4. AI Engineering & Generative AI - GPT-4, OpenAI, Claude, Gemini, LLaMA, Mistral integrations - AI Agents & Autonomous Workflows - LangChain, LangGraph, AutoGen - Conversational AI & AI Chatbots 5. AI SaaS Development: - RAG (Retrieval-Augmented Generation) - AI Voice Agents & Real-time AI Systems - Semantic Search & Vector Databases - AI Automation & Intelligent Workflows - Text Processing, Summarization & Data Extraction 6. Cloud & DevOps: - AWS (EC2, Lambda, S3, CloudFront, DynamoDB) - Docker & CI/CD Pipelines - Serverless Applications - Deployment Automation - Scalable Cloud Architecture AI Tools & Technologies: Vector Databases: Pinecone, ChromaDB, Weaviate, FAISS AI & LLMs: OpenAI, GPT-4, Claude, Gemini, LLaMA, Mistral AI Frameworks: LangChain, LangGraph, AutoGen, PyTorch, TensorFlow Automation: n8n, Make, Zapier, Airtable, Notion Voice AI: Twilio, Deepgram, ElevenLabs, VAPI, Cartesia Proven Track Record: $100K+ Earnings on Upwork 5,400+ Hours Worked 60+ Successful Projects Delivered Long-Term Client Relationships I focus on building scalable, reliable, and AI-driven solutions that create real business impact. If you’re looking for a developer who understands both engineering and business needs, I would be happy to help bring your project to life.
Ashutosh Singh R. has worked .
OnGraph Technologies Private Limited
Associated with
OnGraph Technologies Private Limited
$10M+
earned
Vinayak V.
$25/hr
90% Job Success
$20K+ earned
Available now
Offers consultations
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I help startups and businesses turn ideas into production-ready products. Over the last 6+ years, I've worked across AI, backend engineering, and full-stack development, helping companies build, launch, and scale software that delivers real business value. I've helped multiple businesses transform concepts into products used by real customers—from architecture and MVP development to production deployment, automation, and long-term scaling. My focus is on building reliable systems that are maintainable, scalable, and ready for growth. What I specialize in • AI Agents & Multi-Agent Systems (LangGraph, OpenAI, Claude, Gemini) • RAG Systems, Knowledge Bases & AI Search • Workflow Automation & Business Process Automation • Full-Stack Development (Next.js, React, Django, FastAPI) • APIs, PostgreSQL, Redis, AWS, Docker & Cloud Infrastructure • LLM Integrations and AI Product Development Recent Projects LLM-Powered Social Media Campaign Platform Built an intelligent system that automates ad creation and optimization workflows, reducing manual effort and improving campaign management. No-Code Healthcare Workflow Platform Developed a platform that enables clinicians to automate patient workflows and operational processes through configurable AI-powered pipelines. AI Game Builder Created a platform where users can generate and play AI-powered games with one-click setup and automated backend orchestration. Multi-Agent and RAG Applications Designed AI systems using LangGraph and modern LLM frameworks for document understanding, knowledge retrieval, and complex workflows. Technologies AI & LLMs OpenAI • Claude • Gemini • LangGraph • LangChain • LlamaIndex • RAG • Vector Databases Backend Python • Django • FastAPI • PostgreSQL • Redis • Celery • REST APIs Frontend React • Next.js • TypeScript • Tailwind CSS Infrastructure AWS • Docker • Nginx • CI/CD • GitHub Actions Why clients work with me • Helped businesses go from idea to production and scale products for real users. • Build production-ready systems, not just demos or prototypes. • Strong understanding of both business requirements and technical architecture. • Clear communication, quick turnaround, and long-term support. • Experience across AI, backend systems, cloud infrastructure, and modern web applications. If you're building an AI product, automating workflows, or scaling an existing platform, I'd be happy to discuss your requirements and explore the best approach together.
Vinayak V. has worked .
$16.7/hr
100% Job Success
$6K+ earned
Available now
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I am a Senior Backend Engineer specializing in agentic AI systems and LLM-powered applications. I design and build backend systems where AI models act as autonomous or semi-autonomous agents capable of executing multi-step workflows, analyzing data, and making structured decisions. My core stack is Python (FastAPI), combined with modern LLM integrations and scalable backend architecture. I focus on delivering systems that are reliable in production, not just prototypes. I have experience building: – agent-based AI systems for decision-making and automation – LLM-powered APIs and backend services – retrieval-augmented generation (RAG) systems – data-driven platforms with real-time processing – integrations with external APIs, databases, and messaging systems My approach is engineering-first: I design system architecture before implementation, define clear workflows for AI behavior, and add validation layers to ensure consistent and predictable outputs. Typical architecture I deliver: – FastAPI backend with structured services – LLM integration with controlled prompting and tool usage – async processing (queues / background tasks) – Redis for caching, memory, and rate limiting – database-backed state and logging I pay strong attention to performance, cost efficiency, and security, especially when working with LLM-based systems. If you need an AI system that is well-architected, scalable, and reliable under real-world conditions, I can help you build it properly.
Andranik G. has worked .
$85/hr
$200+ earned
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I build reliable, well-structured backends and data platforms for teams drowning in messy, large, or sensitive data. I'm a working data engineer, currently building the data infrastructure behind large-scale ML at a neurotech company, with an MS in Biomedical Engineering and a BS in Applied Math, and I bring production discipline to Python systems that need to scale and stay compliant, including under GDPR. Most of my work comes down to one thing: turning data and code that works into systems that are organized, dependable, and easy to evolve. I specialize in: - Data platforms & pipelines: ingesting, organizing, and serving large datasets so they're findable, trustworthy, and usable - Backend architecture in Python (FastAPI): clean service-layer design, well-structured APIs, maintainable code - Compliant, production-grade systems: handling large volumes of sensitive data under frameworks like GDPR, with the structure and controls that requires - Dockerized deployment on AWS & Azure: reproducible and operationally ready - ML model-to-API serving: turning notebooks and models into dependable inference services Typical engagements: - Designing or untangling a data pipeline so a team can actually find and trust its data - Refactoring and modularizing an existing FastAPI application - Converting research or ML notebooks into production services - Auditing a brittle backend and mapping the highest-impact fixes before you scale If your system works but feels brittle, disorganized, or hard to evolve, especially with a lot of data moving through it, that's exactly where I add the most value. Not sure where to start? I offer focused backend & data audits: a fixed-scope review with a written set of high-impact recommendations, so you get clarity before committing to a full build.
Colin M. has worked .