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When your backend is breaking under load, your microservices are drifting, or your APIs aren't talking to each other, I'm the engineer who fixes it without breaking everything else. I build and maintain production-grade systems using Java Spring Boot, React, Node.js, and cloud-native infrastructure. My work runs at scale: Microservices handling 20,000+ concurrent users (Spring Boot + Kafka + Kubernetes) REST APIs serving 50,000+ monthly users with clean contracts and error handling CI/CD pipelines on GitHub Actions and Jenkins with automated test gates AWS deployments (EC2, EKS, ECR, ALB) with zero-downtime rolling releases Elasticsearch integration cutting search response times from 800ms to under 200ms OAuth 2.0 + TLS security reducing vulnerability incidents by 70% What I help with: Java Spring Boot microservices, build, fix, optimize React frontend connected to backend APIs Kafka event-driven architecture Docker + Kubernetes deployments AWS cloud infrastructure CI/CD pipeline setup and maintenance API integration and debugging 100% Job Success · Rising Talent · 0-4hr response time If your system is slow, broken, or needs scaling, message me and I'll tell you exactly what's wrong.

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.

Java Spring Developer with over 15+ years of experience building scalable, high-performance solutions across diverse industries. Technical Expertise ✅Spring Ecosystem: Spring Boot, Spring Batch, Spring Cloud, Spring Security, Spring AOP, Spring MVC, JSP, Thymeleaf. ✅ AI : Claude , Codex , RAG ,Integration with OpenAI ✅Microservices & APIs: Microservices architecture, RESTful APIs. ✅Messaging & Event-Driven Systems: Apache Kafka, WebSocket, STOMP, Socket IO ✅Cloud Integration: AWS (ECS Fargate, S3, EC2, ALB, RDS). ✅Database Design: SQL (MySQL, Oracle, Yugabyte, PostgreSQL, MS SQL Server) ✅DevOps & Containers: CI/CD pipelines, Jenkins, Docker, Podman, Kubernetes ✅Search & Caching: Elasticsearch, Redis, Terracotta Caching ✅System Integration & Legacy Modernization: Seamlessly integrate modern applications with legacy systems ✅Frameworks & Tools: JHipster, Keycloak, Flowable, JBPM, Flyway, MapStruct, JavaFX, Java Swing ✅CMS Solutions: Documentum, Alfresco ✅XML & Web Services: SOAP, RESTful services ✅Reporting Tools: Crystal Reports, JasperReports, BIRT ✅Testing Framework/Tools: Junit5,Selenium,JMeter

Spring Boot Specialist | 7+ Years of Experience | Microservices | Event-Driven Architecture I’m a seasoned Java Backend Developer with over 7 years of hands-on experience in designing, developing, and deploying scalable RESTful APIs and microservices using Spring Boot and the Java ecosystem. 🛠️ I’ve architected and delivered robust enterprise applications used in banking, finance, and retail — handling everything from database modeling to CI/CD automation and cloud deployments on AWS and on-prem environments. 🔍 What I bring to the table: 💡 End-to-end API development with Spring Boot, JPA, and Hibernate 🔁 Kafka-based event-driven systems for high-volume processing 🧪 Quality-focused development with 90%+ unit test coverage, SonarQube, and Cypress 🚀 CI/CD pipelines with Jenkins, Docker, and Gradle 🛡️ Secure systems using JWT, OAuth2, and role-based access control ☁️ Experience deploying Microservices on AWS EC2, S3, Lambda, and Docker Compose setups 🧪 My tech solutions have powered: ✔️ Chat-based web platforms using WebSockets and STOMP with real-time messaging ✔️ E-commerce backend APIs including product catalog, cart, and checkout modules ✔️ NetSuite integrations for syncing orders, inventory, and CSV file processing ✔️ Tax calculation integration within e-commerce checkout flows ✔️ Advanced cart and discount logic, including promo codes and gift card redemption ✔️ Swagger/OpenAPI documentation for seamless API consumption ✔️ Multi-locale & translation-ready APIs using Google Cloud Translation API ✔️ Gift card system development: both Customer-to-Customer and Business-to-Customer models ✔️ Robust scheduling features for email delivery and status updates Skills : Java Spring Boot Spring Batch Spring Data JPA REST API Development Apache Kafka Microservices Architecture Event-Driven Architecture AWS (EC2, S3, Lambda) Docker & Docker Compose Jenkins CI/CD OAuth2 & JWT PostgreSQL / MySQL / Oracle MongoDB / DynamoDB JUnit 5 & Mockito SonarQube Swagger & Postman Liquibase / Flyway GitLab / Bitbucket / Git System Design Clean Architecture

⚡ Great software isn’t just built it’s architected for scale, performance, and intelligent automation. I’m a Senior Full-Stack Java Architect with 10+ years of experience building secure, scalable, and production-ready applications for startups and enterprise teams. I don’t just write code I design systems that are reliable today and adaptable for tomorrow. My strength lies in combining deep Java engineering with modern AI capabilities to deliver smarter software, faster development cycles, and long-term business value. 🚀 What I Deliver • Enterprise-grade backend systems (Java, Spring Boot, Microservices) • Scalable SaaS and cloud-native applications • High-performance frontend applications (React, Angular) • Secure APIs and system architecture • AI-powered automation and intelligent workflows → Built for performance, scalability, and real-world usage. 🤖 AI & Intelligent Automation I integrate modern AI capabilities directly into applications to unlock real business value: • OpenAI, Claude, Gemini • LangChain, LlamaIndex • RAG pipelines & semantic search • Vector databases (Pinecone, FAISS) • AI agents & workflow automation Use cases delivered: • AI chatbots & virtual assistants • Document processing & summarization • Knowledge search systems • Business workflow automation → Turning traditional software into intelligent systems. 🛠 Core Technical Expertise Backend & Architecture Java • Spring Boot • Microservices • REST APIs • Hibernate • Secure system design Frontend React • Angular • Next.js • TypeScript • Performance-focused UI Cloud & DevOps AWS • Docker • CI/CD pipelines • Scalable deployments Databases MySQL • PostgreSQL • MongoDB 🌟 Why Clients Work With Me ⭐ Architecture-first approach (not just coding) ⭐ Clean, maintainable, production-ready code ⭐ Strong focus on performance & scalability ⭐ Clear communication and ownership ⭐ AI-enhanced development for faster delivery 💡 What You Can Expect If you're looking for someone who can think beyond development someone who understands architecture, scalability, and modern AI-driven systems I can help you build software that truly supports your business growth. 📩 Let’s Build Something Powerful Whether you're building a new product, scaling an existing system, or integrating AI into your platform I’m ready to help. Let’s discuss your project.

❇️ Top 1% Upwork Talent | 🏆 Top Rated Plus | ✔️ 100% Job Success | ☀️ Available Immediately With 16+ years of experience, I operate at the intersection of AI-driven architecture, enterprise software engineering, and large-scale system design—helping organizations build, modernize, and scale mission-critical platforms. I specialize in designing and delivering high-performance CRM & ERP ecosystems, with deep expertise in Zoho CRM, Odoo, OFBiz, and Moqui, tailored for complex business environments. 🔷 Core Expertise ✔️ Enterprise Architecture & AI Integration Designing intelligent, scalable systems powered by modern AI-driven workflows and automation. ✔️ CRM & ERP Systems Leadership End-to-end implementation, customization, and optimization of enterprise platforms: Zoho CRM Odoo OFBiz / Moqui ✔️ Java & Microservices Excellence Java, Spring Framework, Microservices Architecture Struts2, JavaFX RESTful APIs & distributed systems ✔️ Full-Stack Engineering Frontend: HTML5, CSS3, JavaScript (ES6), ReactJS Mobile: React Native (cross-platform apps) ✔️ Database & Performance Engineering Oracle, PostgreSQL, MySQL, SQL Server Advanced Oracle PL/SQL for enterprise-grade systems 🔷 Delivery & Leadership Approach I bring a consultative, architect-level mindset to every engagement: 📌 Deep discovery & solution blueprinting upfront ⚡ Agile execution with fast iteration cycles 📊 Scalable, future-proof system design 💬 Clear, proactive communication throughout I am highly proficient with modern development workflows and tools including Git, JIRA, Redmine, Bugzilla, Basecamp, and Trello, ensuring seamless collaboration across distributed teams. 🔷 Availability 🕒 30–35 hours/week 🌍 Flexible across time zones 🤝 Strong communication & stakeholder alignment If you’re looking for a trusted technology partner who can architect and deliver robust, intelligent, and scalable enterprise systems, I bring both the strategic vision and hands-on expertise to make it happen. — Harkomal Singh