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Profile updated: 21th July 2026 I am an Upwork Expert-Vetted and TOP RATED PLUS Senior Backend Engineer, PHP Developer, API Architect, and DevOps Specialist with nearly 15 years of experience building scalable backend systems, cloud infrastructure, and high-performance web applications. I have completed 15000+ hours on Upwork with consistent 5-star reviews, working with startups, SaaS companies, and enterprise clients to design reliable, secure, and cost-effective server environments. My primary focus is backend engineering, distributed systems, API development, cloud architecture, and infrastructure automation. I specialize in building scalable server-side applications using PHP, Laravel, Python, Django, Flask, and modern backend frameworks. I work extensively with REST APIs, GraphQL, microservices, authentication systems, event-driven architecture, queue-based processing, and high-load backend systems. I help businesses design backend infrastructures that are optimized for performance, scalability, maintainability, and long-term growth. -Core Backend & Server-Side Expertise * PHP, Laravel, Symfony, custom backend frameworks * Python, Django, Flask, FastAPI * REST API development, GraphQL APIs, webhook systems * Backend architecture, microservices, service-oriented design * Authentication systems (JWT, OAuth2, RBAC, SSO) * Queue systems, background jobs, cron workers, async processing * Database optimization, caching layers, API performance tuning * SaaS architecture and multi-tenant backend systems - AI & Intelligent Backend Integrations * OpenAI, GPT-3, GPT-4, ChatGPT integrations * DALL·E and AI-generated media workflows * Machine Learning pipelines * OCR, document processing, object recognition * AI automation workflows and intelligent data processing - Cloud Infrastructure & AWS Expertise * AWS EC2, Lambda, API Gateway, CloudFront * S3, RDS, Route53, VPC, IAM, Cognito * CloudWatch, SES, SQS, SNS, Elasticsearch * Elastic Beanstalk, ElastiCache, CloudFormation * Scalable cloud-native backend deployment - DevOps & Infrastructure Engineering * Docker, Kubernetes, Jenkins, Ansible * CI/CD pipelines (GitHub Actions, GitLab CI, AWS CodePipeline, Azure DevOps, Bitbucket Pipelines) * Infrastructure automation and deployment workflows * Linux server administration and environment provisioning * Performance monitoring, logging, observability, failover strategies - Databases & Performance Optimization * PostgreSQL, MySQL, MongoDB, Redis * Query optimization, indexing, replication * Redis, Memcached, Varnish, custom caching systems * High-performance backend tuning and bottleneck analysis - Backend Engineering Philosophy I specialize in designing backend systems that are not only functional but also scalable, maintainable, and production-ready. My experience includes server architecture planning, API ecosystems, distributed backend logic, queue processing, DevOps pipelines, and cloud-native infrastructure. I have been leading technical teams and delivering complex backend solutions since 2008. Beyond coding, I provide technical consulting, architectural guidance, and infrastructure planning to ensure projects are built correctly from the beginning. I constantly stay up to date with backend engineering trends, cloud technologies, AI integrations, and DevOps practices to ensure I deliver modern, future-proof solutions. - Additional Technologies * Angular, Backbone.js, jQuery * HTML5, CSS3, SASS * Linux administration and server hardening * Security best practices, monitoring, and optimization * Payment APIs, third-party integrations, webhook systems If you are looking for a senior backend engineer who can architect APIs, optimize infrastructure, build scalable server environments, and deliver enterprise-grade backend systems, I’d be happy to discuss your project.

I'm Jirayr Full-stack developer with 8 years of experience, during this time I've developed effective software industries such as Health care system, Software As A Service, IOT, and Production Monitoring software. I can proudly state that I have succeeded in all projects and positioned them in high rankings, and now I'm ready to explore new markets.

Need to build an AI system over your data (RAG, LLM workflows, automation) — not just a demo, but something that works reliably in production? I design and deliver AI-powered backend systems: RAG pipelines, LLM apps, semantic search, and automation integrated with real business data (APIs, databases, documents, search indexes). Recently, I’ve built systems combining OpenAI / Anthropic / DeepSeek with Pinecone, OpenSearch, Snowflake, PostgreSQL, LangChain, and async pipelines (Celery) for knowledge search, lead processing, messaging, analytics, and automation workflows. 16+ years building production SaaS, high-load APIs, and data-heavy systems. --- 🤖 AI Systems & LLM Work - RAG pipelines over structured + unstructured data (embeddings, vector search, semantic search, contextual answers) - OpenAI-powered knowledge assistant using embeddings + Pinecone vector retrieval + context-aware prompt construction - LangChain SQLDatabaseChain integration for PostgreSQL-backed fallback retrieval - LLM-powered workflows (prompt pipelines, structured outputs, streaming responses) - Real-time streaming AI chat using Django StreamingHttpResponse / SSE-style responses - AI integrated into production systems (Celery, async jobs, retries, batching, monitoring) - Model routing with company/prompt-level fine-tuned model support and fallback handling - Real-world use cases: enrichment, classification, messaging automation, Q&A, data processing --- 🧠 What I can build for you - RAG systems over your internal data (documents, databases, search, QA, assistants) - AI-powered knowledge assistants and semantic search tools - LLM-powered automation (lead processing, emails, enrichment, classification) - Internal AI tools for operations, support, analytics, and data workflows - Backend systems integrating LLMs into real production workflows (not isolated scripts) --- ⚙️ Backend, APIs & System Design - Python, Django, Django REST Framework, FastAPI - API design, auth, permissions, business logic orchestration - Webhooks & integrations (Stripe, SendGrid, Nylas, Zapier, OpenAI, etc.) - High-load async systems (Celery + Redis, queues, retries, scheduling) - Production-safe error handling, fallback logic, logging, and debugging --- 📊 Data, Search & RAG - PostgreSQL/Aurora, Snowflake - OpenSearch / Elasticsearch, Pinecone - Embeddings, vector search, semantic search, context retrieval - Data modeling, ETL pipelines, complex SQL, performance tuning - Enrichment, deduplication, segmentation, scoring systems --- ☁️ Infrastructure & Delivery - AWS (S3, Lambda), Docker, Nginx - CI/CD, production deployments, monitoring - Reliable systems for high-throughput and data-heavy workloads --- 🖥️ Frontend (when needed) - React, TypeScript - Dashboards, admin tools, API-driven interfaces - Frontend integration with AI-powered backends and streaming responses --- 🎓 Applied Mathematics & Computer Science Background - Mathematical modeling of real-world systems - Probability, statistics, numerical methods - Optimization, algorithms, system-level thinking This foundation helps design efficient, scalable AI systems (RAG, pipelines, search, data workflows). --- 📜 Certifications & Learning - Generative AI for Software Developers Specialization - LangChain for LLM Application Development - Claude Code in Action (Anthropic) - RAG / AI Systems / AWS certifications in progress --- I focus on building systems that actually work in production — reliable, scalable, and aligned with real business workflows. If you need AI integrated into your backend, data, search, or automation systems, I can help.

I'm a Senior Python Developer & Machine Learning Engineer with over 15 years of experience building high-performance, scalable backend systems and deploying production-grade AI solutions. I specialize in: AI Agents using LangChain, OpenAI APIs, and custom tools ML Systems for Computer Vision, OCR, and image enhancement (GANs, segmentation, stylization) Backend Engineering with FastAPI, Django, PostgreSQL, and scalable cloud deployments (AWS, Docker, Kubernetes, Nvidia Triton) From leading startup teams and migrating legacy systems to cloud-native infrastructure, to shipping ML services used in real-world products — I deliver end-to-end solutions that are robust, maintainable, and scalable. 🧠 Technical Focus Languages & Frameworks: Python, FastAPI, Django, Scrapy, Flask AI/ML: PyTorch, TensorFlow, OpenCV, LangChain, OpenAI, Numpy, Scikit-learn DevOps & Cloud: AWS, Docker, Ansible, Kubernetes, Redis, RabbitMQ, Nvidia Triton Databases: PostgreSQL, MySQL, MongoDB, FAISS, Milvus Frontend (as needed): React, HTMX, JS, jQuery 💼 What You Can Expect ✅ Clean, production-grade code ✅ Scalable architecture with CI/CD and cloud-native design ✅ Deep understanding of both traditional backend and cutting-edge AI systems ✅ Strong communication and fast iterations Let’s build something powerful — whether you're launching a new AI product or scaling an existing system.

Available for new projects starting from 21 July 2026 Python React Full Stack Developer 15+ Years Experience • 35,100+ Verified Upwork Hours • 120+ Completed Projects • $1M+ Earned • Top Rated Plus • 100% Job Success I'm a Python React Full Stack Developer helping startups, founders, and established businesses build SaaS platforms, AI applications, marketplaces, enterprise software, and custom web applications from MVP to production. Why clients hire me Python React Full Stack Developer → 35,100+ verified Upwork hours Python Full Stack Developer → 120+ successfully completed Upwork projects Web Application Developer → 85+ SaaS products, MVPs, marketplaces, dashboards, and enterprise platforms delivered SaaS Developer → 40+ successful product launches AI Developer → 24+ AI-powered platforms and automation projects Full Stack Development → 15+ years of commercial software engineering API Integration → 300+ third-party integrations completed React Developer → 50+ production web applications Python Developer → 50+ backend systems built and maintained Django Developer → 45+ scalable SaaS applications Business Results Helped clients raise $3M+ in investment after product launches. Built products that later achieved 3 acquisitions. Developed platforms serving 500K+ users. Built business software used by 1,000+ companies and organizations. Automated workflows saving clients 3000+ hours of manual work. Reduced infrastructure and operational costs by over $800.000. Improved application performance by an average of 40%. Increased platform scalability to support 10MM+ daily users. Integrated 300+ APIs, including OpenAI, Stripe, PayPal, Twilio, Shopify, Salesforce, HubSpot, Google, and many others. Delivered 40+ long-term software modernization projects. Selected Product Experience DogVacay → Contributed from the earliest product stages through its acquisition by Rover. CompTool → Built from scratch. Now serving 1,000+ business customers. FairyGodBoss → Developed the core platform through early growth and Series A. ReviewRamp → Helped build the platform from day one through acquisition. Technical Expertise Backend Python, Django, FastAPI, Flask, Node.js, Express.js, NestJS, REST API, GraphQL, API Integration, WebSockets, Authentication, OAuth, JWT, Microservices, Workflow Automation, PostgreSQL, MySQL, MongoDB, Redis. Frontend React, Next.js, TypeScript, JavaScript, Vue.js, Angular, HTML5, CSS3, Tailwind CSS, Responsive Design, SPA, SSR. AI Development OpenAI, GPT, AI Integration, AI Agent Development, LLM Applications, RAG, Vector Databases, Workflow Automation, Intelligent Search. Cloud & Infrastructure Amazon Web Services (AWS), Docker, Kubernetes, CI/CD, GitHub Actions, GitLab CI, Cloud Infrastructure, Production Deployments. Industries Artificial Intelligence, Healthcare, HR & Compensation, Legal Tech, Marketing Technology, Data Engineering, Property Management, Marketplace Platforms, Cybersecurity, Workforce Management. If you're looking for a Python React Full Stack Developer, Python Full Stack Developer, Web Application Developer, or SaaS Developer to build, modernize, or scale your next product, I'd be happy to discuss your project.

I’m a Python and JavaScript developer with strong experience building web applications, automation tools, and backend APIs. I work with Django, FastAPI, React, and Node.js to deliver fast, scalable solutions. My focus is writing clean, maintainable code and solving complex problems efficiently. I’ve completed projects involving scraping, integrations, and full-stack development. If you need a reliable developer who delivers on time, I’m here to help.