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💻 Senior Java Developer | Spring Boot | Cloud | E-commerce | Automation | ETL | Space Systems | 10+ Yrs 🚀 10+ years of experience building scalable, cloud-native applications and automation systems using Java (8–21), Spring Boot, and modern DevOps practices. ✅ Why Choose Me? Enterprise Java Expertise: Deep knowledge in Java SE/EE, Spring Boot, Spring Cloud, JPA/Hibernate. Space Software Development: 3 years in mission-critical ground segment systems for satellite operations. E-commerce Automation: Integrated with Amazon SP-API, eBay, Etsy, Walmart, Shopify, and more. Cloud & DevOps: AWS, GCP, DigitalOcean, CI/CD (GitHub Actions, Jenkins, GitLab). ETL & API Integration: n8n, Make.com, custom data pipelines with FTP, SOAP, HTTP. Database Proficiency: PostgreSQL, MongoDB, Oracle, Couchbase, Cassandra, Elasticsearch. UI Skills: HTML, CSS, JavaScript, Bootstrap for clean, responsive interfaces. 🔧 Tech Stack Languages: Java, SQL, JavaScript Frameworks: Spring Boot, Spring Cloud, Spring Batch Cloud: AWS, GCP, DigitalOcean Databases: PostgreSQL, MongoDB, MySQL, Oracle, Cassandra DevOps: Docker, Jenkins, GitHub/GitLab CI/CD APIs/Automation: Amazon SP-API, Shopify, DHL, n8n, Make.com

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 am a senior developer with 21 Yrs. of experience ( 12+ Yrs with JPMorgan and rest with Deloitte, HCL and other) in Java/J2ee, Python, Rest API, SOAP API, javascript, OAuth, SSO, Kafka, SpringBoot, HTML, CSS, PHP, Web Design, Web Development, React, Redux, Angular, e-commerce, Wordpress, Shopify, JPA, Cloud, AWS, Azure, GCP, Private cloud, JBPM, n8n, Oracle BPM, JMS, Hibernate, Struts, Spring Batch, ESB, Base44, Playwright, Selenium, JavaFX, Lisp, Prolog, Weka , OpenAI, Different Web as well as Application Servers, different Operating Systems and DBMS Tools, SQL, NoSQL, PostgreSQL, Mongo, Cassandra, MYSQL, Oracle, Supabase, AI, NLP, OpenAI, agent development, Wordpress, php , CI/CD, Agile and various open-source tools, technologies and frameworks. Some of the domains I have worked on are Banking, finance, Trade, Crypto, HR, Insurance, Learning, NLP, Healthcare, System architecture, Developers Tooling, Document management, AI, DevOps, Cloud, GCP, Hubspot, Quickbook, PandaDoc, Stripe, web3, Blockchain, etc. ********************************************************************* Experience Summary: Freelancing || Freelancing || Present Toyow || Solution Architect || Sep 24 to JAN 25 JPMorgan || Vice President || (Around 12 Yrs. Total) Deloitte || Senior Consultant/Specialist Senior || Jun 13 to Jun 15 HCL || Onsite/Offshore Dev lead || Sep 06 to May 10 Birla Soft Ltd || Software Engineer || Jan 06 to Sept 06 GIIT || Developer || Feb 05 to Oct 05 ************************************************************************* Some of the applications are as below: - Document generation system - Online translation system using NLP - Library management system - HRMS System - Networking system - Tools for Developer and Operate to build and deploy their applications. - Workflow as a service - Workflow Platform for Mutual Fund NAV processing (Fund accounting) - Prediction analysis for SLA miss. - A real time dashboard for fund processing - Messaging Platform supporting MQ, SFTP, REST, Kafka, FIX, - Trade instruction manager - Customer support system for Bank operators - Platform for Tokenization Assets using Blockchain - A social Media application - A insurance management Platform - Applications developed on Base44 - Loan record reports - OCR for healthcare reports and data processing. - ChatBot for Patient enquiry. - Coin analysis using AI (openAPI integration). - A Platform for affiliate marketing. - CI/CD for Gitlab and AWS.

👋 Hi, I'm Sourav, a Senior Software Developer with 10+ years of full-stack experience, specializing in Java, Spring Boot, Microservices, and scalable distributed systems. 🚀 I help startups, enterprises, and individual developers solve complex problems — whether you're building a backend system, preparing for coding interviews, or tackling tech assignments. 🔧 Services I Offer: ⚙️ Full-Stack Development (Java 21, Spring Boot, React) 🧠 Coding Interview Prep (DSA + System Design for FAANG & Top Tech) 🧩 Scalable Backend Systems (Microservices, Kafka, Redis, NoSQL) 🛠️ Architecture Guidance (HLD/LLD, Design Patterns, Best Practices) 🎓 1:1 Mentorship, Code Reviews, Training Sessions, and Project Support 📝 Help with Assignments, Quizzes, Labs, and Real-World Challenges 🧠 Expertise: Strong command over Data Structures & Algorithms (LeetCode 1800+ problems solved) Designed resilient, distributed systems for real-world use cases Built and deployed end-to-end microservices apps on AWS & GCP Extensive experience with coding platforms: LeetCode, HackerRank, Codeforces 💻 Tech Stack: Languages & Frameworks: Java 21, Spring Boot, Hibernate, JPA, Node.js, ASP.NET Frontend: React, Angular, HTML5, CSS3, Bootstrap Databases: MySQL, PostgreSQL, MongoDB, Firebase, Cassandra DevOps & Cloud: Docker, Kubernetes, Jenkins, Git, AWS, Azure, GCP Testing: JUnit, Mockito, PowerMock, Mocha, Jasmine 💬 Why Work With Me? ✅ Industry-grade experience from IBM ✅ Proven results in coding mentorship and interview prep ✅ Deep focus on clean, scalable, and maintainable code ✅ Excellent communicator with global remote work experience 📬 Ready to level up your tech stack or crack that interview? Let’s connect and build something great — together!

Proven expertise in managing the entire software development lifecycle—from gathering customer requirements, analysis, and design to development, automated testing, and deployment—utilizing a diverse technology stack including Java/J2EE, Python, C#, VueJS, AngularJS, JSF/PrimeFaces, Laravel, PHP, AWS, and WordPress. Extensive experience in the design and development of mission-critical applications, with a strong focus on: Requirement Analysis: Collaborating with stakeholders to understand and document project requirements, ensuring alignment with business objectives. Technical Design: Crafting robust architectural solutions, creating proof of concepts (POC), and providing detailed estimations to guide project execution. Development & Automation: Leading development teams to implement scalable, high-performance applications, and utilizing automation tools for testing and deployment. Code Review & DevOps: Conducting thorough code reviews to maintain quality standards and driving continuous integration and deployment processes using DevOps best practices. Skilled in providing comprehensive support for critical applications, offering clients in-depth technical knowledge, customized solutions, and feature-specific enhancements. A quick learner with a demonstrated ability to adapt to rapidly changing technical environments and resolve complex issues effectively. Known for delivering high-quality results under tight deadlines. Technical Skills/Tools: Programming Languages & Frameworks: Java, J2EE, Python, C#, PHP, Laravel JSF, PrimeFaces, Spring, Spring Boot VueJS, AngularJS, JavaScript, NodeJS Web Development: WordPress, HTML/JS/JSON Version Control & CI/CD: Git, SVN, Maven, Jenkins, Docker, Ansible Other Tools: Eclipse IDE, Trello Specializations: Machine Learning, AI, Selenium (Java), Data Scraping Tools (Java) Unity

I'm Tarandeep Singh, a Full-Stack Developer, UI/UX Designer, and Automation Specialist with 7 years of experience in PHP, HTML, CSS, JavaScript, and more. I help clients seamlessly grow their businesses by combining robust full-stack development, clean and modern web design, and advanced automation solutions. My approach focuses on delivering results that are not just functional but also visually appealing and user-friendly. In addition to development, I specialize in web design and UI/UX design, creating responsive, intuitive interfaces that enhance user experience and align with your brand. I work with tools like Figma, Adobe XD, Photoshop, and Illustrator to design everything from landing pages to full dashboards. I’m highly experienced with Shopify, both in custom theme development and app integration, and have delivered multiple e-commerce solutions tailored for performance, design, and scalability. Whether it's a Shopify store setup, product customization, or third-party integration, I ensure smooth and efficient outcomes. I'm proficient in Angular, React app modifications, Laravel, and a wide range of APIs including Instagram, Facebook, Linnworks, Google, Gmail, Baremetrics, Zoho Inventory, Zoho CRM, Freshbooks, WP Rest, Chart Mogul, Trello, Airtable, JSON, and more. My deep experience with various MVC frameworks allows me to craft robust backend systems to power modern applications. On the automation side, I work extensively with platforms like Pipedrive, Zoho, Make.com, Zapier, ClickUp, and Google Apps Script—automating workflows, syncing data, and building efficient systems to match unique business needs. I also bring expertise in PHP Smarty, Twilio for messaging/call automation, and Google Sheets scripting. From building stunning business websites to automating end-to-end processes and creating engaging Shopify stores, I approach each project with dedication and a commitment to delivering high-quality results. Feel free to reach out—I’m available across all time zones and happy to discuss your project needs. Warm regards, Tarandeep Singh