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Hello, I’m Chandan Singh — a Top Rated Full-Stack Software Engineer with 12+ years of experience in designing, developing, and scaling reliable software systems across web, desktop, mobile, and hardware-integrated platforms. I hold a B.Tech in Computer Science & Engineering and an M.Tech in Automation & Robotics, which allows me to bridge the gap between software, systems engineering, and real-world automation. Over the past decade, I’ve helped startups, businesses, and individual clients build production-grade systems, fix critical issues, and scale applications with a strong focus on performance, maintainability, and long-term stability. What I Do Best - I specialize in solving complex engineering problems — whether that means: Building systems from scratch Improving or refactoring legacy codebases Debugging critical production issues Adding new features without breaking existing systems Optimizing performance and scalability Designing robust architectures for long-term growth I don’t just write code - I analyze, design, and deliver solutions that work in real-world conditions. Core Technical Expertise: Backend & Systems Development Python (Flask, Django, FastAPI, Automation, AI integrations) PHP (Laravel, CodeIgniter, WordPress, WooCommerce) Node.js (APIs, microservices, real-time systems) Frontend Development React.js, JavaScript (ES6+) Responsive UI/UX implementation Databases & Performance MySQL, PostgreSQL, MongoDB, Redis Query optimization, indexing, and scaling strategies API Engineering RESTful APIs Third-party integrations (payment gateways, SaaS tools, external data providers) Webhooks and event-driven systems Web Scraping & Automation Selenium, Puppeteer, headless browsers High-performance scraping systems with proxy rotation & anti-bot handling Workflow automation and data pipelines Cloud & DevOps AWS (EC2, S3, RDS, Lambda) VPS, Docker (if applicable), server configuration CI/CD pipelines, deployment automation DNS, migrations, and infrastructure management Advanced & Emerging Expertise AI & Intelligent Systems Machine Learning integration using Python AI-powered automation tools Data-driven decision systems LLM integrations and workflow automation IoT & Robotics Arduino, ESP32, Raspberry Pi Sensor integration and real-time device communication Hardware-software interfacing Automation systems and robotics workflows Applications I’ve Built Scalable web platforms and SaaS products Trading tools and financial automation systems Data scraping engines and monitoring systems Desktop applications (cross-platform) E-commerce platforms and custom CMS solutions IoT-based smart systems and automation tools Strong Engineering Foundation I bring deep understanding of: Data Structures & Algorithms Object-Oriented Programming (OOP) Database Management Systems (DBMS) System Design & Architecture Clean Code & Maintainability Principles How I Work Clients work with me because I bring clarity, ownership, and reliability: I fully understand requirements before starting I communicate clearly and consistently I focus on long-term solutions, not quick fixes I write clean, maintainable, production-ready code I respect deadlines and take full responsibility for delivery I’m comfortable working independently, taking ownership, and collaborating with teams when needed. What You Can Expect - Clean, scalable, and well-documented code Efficient problem-solving and debugging Seamless feature integration into existing systems Stable and reliable application performance A long-term technical partner, not just a freelancer If you’re looking for a senior developer who can think independently, solve complex problems, and deliver high-quality systems, I’d be glad to work with you. Let’s build something robust, scalable, and future-proof. I am just a message away. Chandan Singh

I help businesses ensure software reliability and build efficient system utilities through rigorous QA automation, custom background scripts, and tailored embedded hardware integrations. With a solid foundation in Computer Systems and hands-on experience in full-cycle desktop application testing, I specialize in turning complex technical specifications into optimized, production-ready code. Whether you need an automated web testing pipeline, a resource-friendly Windows process logger, or a hardware abstraction layer for an IoT device, I focus on performance, edge-case resilience, and clean documentation. Here is how I can add value to your project: QA & Browser Automation: Developing resilient, end-to-end testing frameworks and automation scripts using Playwright and Selenium (Python/JavaScript) to validate web forms, API responses, and user flows. Desktop Testing & OS Utilities: Comprehensive black-box and functional testing for desktop applications, alongside building lightweight, standalone Windows environment diagnostics and activity loggers. Embedded Systems & IoT: Comprehensive software stack development on Raspberry Pi architectures, utilizing Python on embedded Linux, GPIO/I2C interfacing, and event-driven logging. Data Collection & Scripting: Building high-throughput, structured data scraping pipelines and API integrations designed to bypass common blocking mechanisms smoothly. My Core Technical Stack: Languages: Python, Node.js, C++ Automation & Testing: Playwright, Selenium, PyTest Hardware & Embedded: Raspberry Pi, Linux, OpenCV, I2C/GPIO Data & Backend: FastAPIs, RESTful APIs, PostgreSQL, MySQL I am committed to a "zero-bloat" code philosophy and clear communication throughout the project lifecycle. Let's connect to discuss how I can help streamline your software development and testing workflows!

Senior Python Developer | 7+ Years of Full-Stack Experience | Vibe Coding Cleanup Specialist I specialize in high-performance web applications and data systems and have a proven track record of optimizing and scaling enterprise solutions. 🌟 Technical Expertise Backend: Django, Flask, FastAPI, Rust, HonoJs, ExpressJs Data Extraction: Scrapy, Beautiful Soup, Selenium Databases: PostgreSQL, MongoDB, Redis Frontend: React.js, Vue.js, TypeScript DevOps: AWS, Azure, Docker, Git Other: Kafka, RabbitMQ, ETL, JWT, Stripe/PayPal integration 🌟 Major Achievements • Reduced API response times • Built an e-commerce platform • Automated testing framework • Data pipeline system • System modernization 🌟 Specialties • Backend/API Development • Data Extraction • Database Optimization • Full-stack applications • Test Automation Available for prototype development (free initial phase) Keywords: Python, JavaScript/TypeScript, SQL, Node.js, Rust, Django, Flask, FastAPI, Vue.js, React.js, PostgreSQL, MongoDB, Redis, AWS, Docker, Scrapy, Selenium, GIt, Rust

Top rated, very hands on, IT Systems Architect and Lead Developer with a proven track record that spans more than two decades in both the Private and Public sector. Legit out-of-the-box thinker with problem solving abilities that have consistently provided original innovating solutions or saved heavily invested ones from sinking. ** My 4.2 stars rating is only due to a 9-years old 100K project that was successful but the client only rated it 4.0, due to his particular style of being strict with ratings. This rating only took effect recently due to Upwork making the choice to include LIFETIME ratings. Without it, my overall stars rating would be 4.9** My hard earned skills & experience are backed by a solid formal education in computer science at top-tier US and UK Technical Universities; I hold an MSc in Computer Science from Heriot-Watt University and, during my 6 years with European Commission's Cybersecurity department, I led the development & successful delivery of projects as important as the European Root Certification Authority for EU's Digital Tachograph: dtc.jrc.ec.europa.eu After years of tackling the hardest of IT projects, I am now a true all-rounder that, for the past couple of years have been involved in complex, real world projects built around fine tuned multi-LLM pipelines for reasoning, vision and multi-modal tasks. - AI-integrating endpoint protection using WFP kernel drivers, ETW/Sysmon telemetry, machine learning and on-device LLM reasoning (dual local LLaMA tiers, ONNX/NPU acceleration, behavioral-rule detection), autonomous response logic (graduated SOAR, cryptographic update channels) and WinUI 3 GUIs. C#/.NET 10 and C/C++ kernel coding, cryptography, MLOps and model fine-tuning. - Bespoke and innovative AI-integrating solutions using Python, Streamlit, Anthropic Claude APIs, all-MiniLM-L6-v2, FAISS, PyPDFLoader, LangChain's RecursiveCharacterTextSplitter, Playwright for PDF generation, Mermaid.js, with robust custom renderer, for diagrams/graphs, and fal.ai Flux Schnell, with smart prompt enhancement, for realistic AI image generation. - Multi-Agent Behavioral Surveillance Video Analysis Pipelines built using OpenCV, YOLO, Gemini Flash, Claude and creative Prompt Engineering, - node.js (REST APIs, Servers of all sorts, etc.), AngularJS, Showdown.js - MySQL, PostgreSQL, SQL Server, MongoDB, SQLite, Redis - Office Development (VSTO & Office.js Add-Ins for all of the MS Office apps as well as VBA macros automation/scripting) - Google APIs & Google Apps Script development/deployment, as custom API points, accessing Documents, Presentations, etc., with Google Slides API, Google Drive API, etc. from web or desktop apps. - Puppeteer & Playwright expert with experience in developing and deploying 24/7 scraping/marketing bots via fine tuned AI chatbots, that make posts & add replies to relevant questions. on FB groups and sites like Quora & Reddit. - Browser Extension Development for both Chrome & Firefox (including fully transparent installation of Chrome Extension or FF Extension) - Headless Browser Automation and/or Scraping, either via a script injecting Chrome Extension, with ability of fully clandestine installation, or via Puppeteer (with ability to use the original system provided Chrome browser, either externally or by injecting a custom script in the browser page) - Full-stack LAMP development (Laravel) - .NET/C# Windows Desktop Solutions. Both Windowed Apps (MFC, Windows Forms, WPF, WebView2, WinUI 3) and Background Services development, - C/C++ Low-Level Development on both Linux and Windows platforms (sockets, multi-threading, low-level APIs, etc.) - Azure Active Directory (AD) accessing Apps, mainly used for adding SSO to apps with Microsoft (Azure AD) as the IdP. - Amazon AWS Expert: (CloudHSM, KMS, EC2, S3, Lambda, DynamoDB, RDS) - Google Cloud Platform (GCP) Expert:Google Compute Engine (GCE), Cloud Storage, Cloud SQL. etc. - Cryptography, IT Security & actual HSM (Hardware Security Modules) expert. Experience with FEA (Federal Enterprise Architecture) - Development of Original JPEG Steganography solutions for DRM & IPP purposes. - Programmatic PDF generation & modification (PDFBox, wkhtmltopdf, html2pdf, backend LibreOffice integration, etc.) - ShareLaTeX/Overleaf - Adding OpenID, SAML, OAuth, OIDC (OpenID Connect) authentication & authorization to existing web apps, using Keycloak. - Development of Reverse Proxies (SOCKS or other) as part of Residential IP VPN system development - VPN Development & TAP Drivers (OpenVPN) - Custom (C++), AutoIt, VBScript and JavaScript Windows Application Automation - OTT and Streaming media protocols expert: NDI, DIAL, Google Cast, SSDP, mDNS, AirPlay, Fling, Amazon Device Messaging (ADM) - Development of NDI streaming applications around NDI Tools & Tractus tools (like Tractus MultiView for NDI), for customized NDI stream generation and dissemination I can help you!

I architect, scale, and rescue high-load Python backend systems. As an Expert-Vetted Python Architect (Top 1%), I partner with engineering teams to resolve deep performance bottlenecks in applications that have outgrown their initial architecture. With a decade of engineering experience, my work focuses on structural solutions rather than patching symptoms. I build scalable backends capable of handling severe traffic spikes, supported by rigorous database tuning and event-driven design. ENGINEERING FOCUS - High-Load Backend Architecture I design async-first FastAPI and Django services built for scale. I implement horizontal scaling, robust caching layers (Redis), and reliable message brokers (Kafka, RabbitMQ, Celery) to ensure system stability under unpredictable loads. - PostgreSQL Performance & DBA I specialize in advanced database optimization. When standard indexing is no longer sufficient, I implement table partitioning, logical replication, PgBouncer connection pooling, and complex query refactoring. My priority is redesigning data access patterns and eliminating N+1 anomalies at the ORM layer. - System Refactoring & Technical Debt I regularly audit struggling backends. I provide comprehensive profiling for memory leaks, slow queries, and I/O bottlenecks. I execute phased refactoring without halting production, delivering fully tested, documented code integrated into your CI/CD pipelines. • Production-Grade AI Integration Integrating OpenAI/Anthropic APIs into backend workflows. I build fault-tolerant RAG pipelines using pgvector, ensuring strict rate-limiting, cost-monitoring per token, and fallback mechanisms for predictable enterprise use. RECENT INFRASTRUCTURE WINS - Resolved critical database lockups in a monolithic Django app by implementing PgBouncer connection pooling and refactoring ORM queries, reducing required compute infrastructure by over 40%; - Redesigned data access patterns on a 2.5B+ row PostgreSQL table via declarative partitioning and materialized views, dropping complex analytical query latency from ~35s to under 250ms; - Migrated a high-traffic synchronous Django API to async FastAPI, reducing average response times by 70% with zero downtime. Due to the nature of enterprise work, client names are strictly confidential. I am happy to discuss specific architectural patterns and system designs during an interview. Tech Stack: Python, FastAPI, Django, PostgreSQL, ClickHouse, Redis, RabbitMQ, Kafka, Celery, Docker, Kubernetes, AWS, GCP. I am currently accepting select engineering projects. Let's schedule a technical sync to discuss your current architectural bottlenecks.

Experienced Blazor, C#/.NET, and Full-Stack Developer With over 10 years of experience, I help businesses build scalable, reliable, and maintainable web and desktop applications using React.js, Blazor, C#/.NET, SQL Server, Azure, and Entity Framework. My work spans AWS, WinForms, Web Services, and QuickBooks, ensuring end-to-end solutions that meet real business needs and deliver measurable results. 💼 Key Specialties: - .NET Technologies: .NET, ASP.NET, Blazor, Microservices, C#, VB.NET, Python, Django, FastAPI, PyQt Guru, - Backend & Data: ASP.NET, .NET Core, Microservices, SQL Server, Stored Procedures, Entity Framework - Front-End & UI: Angular, React.js, Tailwind CSS, Ionic, Capacitor — optimized for responsive, performant interfaces - API & Integration: Node.js, Web APIs, Web Services, Elasticsearch - Desktop & Cross-Platform Apps: Electron, Ionic, Capacitor - Testing & Architecture: Design Patterns, Unit Testing (NUnit, Mock) ⚡ React | Next.js | Python | Node.js Developer | PyQt Specialist - React.js: Building dynamic, responsive, and user-friendly interfaces - Next.js: SEO-friendly sites with server-side and static rendering - Node.js: Robust backend APIs and efficient data handling - Python: Automation, data processing, and backend services 🛍 Vendure & Svelte 5 Specialist | Web Apps & Headless Commerce - Vendure setup, custom plugins, and GraphQL integration - Svelte5 for smooth, lightweight frontends - Clean architecture built for long-term performance 🤝 My Working Approach & Long-Term Collaboration - Translate requirements into clean, maintainable solutions - Communicate clearly and proactively - Deliver quality code with testing and documentation - Collaborate closely to solve complex technical challenges 📌 Turning ideas into real, working products: Whether it’s a dynamic web app, an API ecosystem, or a headless commerce platform, I can help you turn ideas into reality with modern technologies and reliable delivery. Let's meet and discuss your ideas further 😊