❇️ 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

Experienced software engineer with over 15 years in backend development and software architecture. Proficient in Java and Java Spring Boot for building microservices, with strong experience in team leadership, project management, and system architecture. Focused on clean, readable, reusable, and maintainable code following SOLID principles. Continuously learning and exploring new technologies to improve solutions and processes. Worked with Fintech, E-commerce, High performance betting platforms. Exploring Spring-AI. Key Skills • Technical Analysis and Requirement Analysis. • Team management and fostering a healthy team culture. • Backend Development (Java, Spring Boot, Microservices) • Code Reviews and Software Development Best Practices. • Problem Solving and System Design. Technologies Languages: Languages: Java, JavaScript, C++, SQL Frameworks: Spring Boot, React Databases: PostgreSQL, MySQL, MongoDB Caching: Redis, In memory cache Message Queues: RabbitMQ Version Control: Git, SVN Project Management: Jira, Trello Current Role: Lead Engineer, Incognito Solutions Ltd, Dhaka, Bangladesh (June, 2024 – Present) Leading a specialized development team of 5 Java developers and 2 frontend developers, overseeing the full software development lifecycle from business requirement analysis to solution design and implementation. Responsible for architectural decisions and technical direction for custom software solutions, specializing in gaming and betting platform development. **Key Responsibilities:** • Drive technical strategy and architecture decisions for complex software projects • Lead backend development using Java Spring Boot and microservices architecture • Oversee frontend integration with React and Next.js frameworks • Conduct code reviews and enforce best practices to maintain high-quality codebase • Collaborate with clients to understand business requirements and translate them into technical specifications • Mentor junior developers and foster a culture of continuous learning and innovation **Key Achievements:** • Successfully led the development of ds.lavender-777.com, delivering a comprehensive betting platform with gaming integration • Implemented RabbitMQ as a pub-sub messaging system across three key services (Accounting, Reward, Settlement), enhancing system reliability and performance • Pioneered the adoption of Java 21 with virtual threads, significantly improving system concurrency and performance • Optimized resource utilization through parallel processing techniques, reduced API response times. • Established coding standards and review processes that improved code quality and reduced production issues.

I help businesses build, scale, and modernize enterprise portal and backend solutions using Liferay DXP, Spring Boot, and Java and integrate AI capabilities that make those platforms smarter and more automated. 100% Job Success Score. Top Rated. 15 completed projects. 7,800+ hours delivered. I don't just write code. I architect solutions that last. ★★ Why Clients Choose Me ★★ ✔ End-to-end ownership from requirement analysis to deployment and maintenance ✔ Clean, modular, well-documented code built for long-term maintainability ✔ Experienced as Developer, Architect, and Team Lead in agile environments ✔ Strong communicator who keeps projects on track and clients informed ✔ Equally effective working independently or leading a team 🤖 AI & Modern Integration Clients increasingly need AI built into their existing systems not as a separate tool, but woven into their portals, workflows, and APIs. I deliver that: ✦ LLM Integration: OpenAI (GPT-4o), Claude (Anthropic), Google Gemini via REST APIs ✦ RAG Pipelines: context-aware AI assistants using LangChain, LlamaIndex, and vector databases (Pinecone, Weaviate, pgvector) ✦ AI-Powered Search: semantic search and intelligent recommendations via Elasticsearch + embeddings ✦ Workflow Automation: integrating AI into Spring Boot microservices for document processing, classification, and business automation ✦ Chatbot Development: intelligent support and internal bots for enterprise portals ✦ Prompt Engineering: production-safe, reliable prompt design for real business use cases ☕ Java / Spring Boot ✦ Spring Boot 3.x, Spring Framework 5.x, Spring Security, Spring Data JPA ✦ Microservices architecture, REST & SOAP APIs ✦ RabbitMQ, Kafka for async messaging ✦ Hibernate/JPA, Maven, Gradle ✦ Databases: MySQL, PostgreSQL, Oracle, MongoDB, Cassandra 🌐 Liferay DXP Expertise With deep hands-on experience across Liferay 5.x through 7.x/DXP, I cover the full lifecycle: ✦ Portlet, Hook, Theme, and Extension development ✦ Liferay DXP environment setup, performance tuning, and clustering ✦ SSO integration, LDAP, CAS, Keycloak ✦ Elasticsearch integration and workflow management ✦ Version migrations and upgrades (5.x → 6.x → 7.x/DXP) ✦ Payment gateway integration (Stripe, Authorize.net, BillDesk) ✦ Content management and enterprise portal solutions ☁️ DevOps & Cloud ✦ AWS (EC2, S3, Lambda, RDS) ✦ Kubernetes, Docker, Jenkins CI/CD ✦ Cloud Foundry ✦ Git, SVN. version control and branching strategies ✦ Splunk monitoring with DB Connect and Active Directory LDAP 📱 Android Development (Java & Kotlin) ✦ REST/SOAP web services, JSON/XML parsing ✦ Messaging: Twilio, XMPP, QuickBlox, OpenFire ✦ Social integrations: Spotify, Facebook, Instagram, SoundCloud ✦ Maps: Google Maps, Mapbox, GPS ✦ Payments: Stripe, Authorize.net, BillDesk 🛠 Full Tech Stack Languages: Java, Kotlin, JavaScript, TypeScript Frameworks: Spring Boot, Hibernate, React.js, Angular AI/ML: LangChain, OpenAI API, Claude API, vector databases, RAG pipelines Cloud: AWS, Kubernetes, Jenkins, Cloud Foundry Databases: MySQL, PostgreSQL, Oracle, MongoDB, Cassandra Tools: Git, Maven, Gradle, Eclipse, JIRA 📌 Notable Projects ✦ Built a music social network with stories, followers, and deep API integrations Spotify, Apple Music, YouTube, Facebook, Instagram ✦ Led a cross-functional agile team across native and backend development, reporting directly to product executives ✦ Architected and delivered enterprise portal solutions for large organizations on Liferay DXP ✦ Implemented Splunk enterprise monitoring with DB Connect and Active Directory LDAP ✦ Delivered full-stack AI integration projects connecting LLMs to existing Java/Spring Boot backends Let's talk about your project. Whether you need a robust backend API, a Liferay portal built or migrated, or an AI feature integrated into your existing system, I deliver on time, with clear communication throughout. Message me and let's get started.

Greetings! I'm Abhishek, a Sr. Software Engineer with 15+ years of experience as a Full Stack Developer and 9+ years as a Cloud Engineer. Technology Stack Details: ✓ Java: Java (7,8,11), SpringBoot, Spring Data, Spring Rest, Spring Cloud, JavaEE, Hibernate ✓ Cloud: AWS, Google Cloud (GCP), Docker, Kubernetes, ECS, Cloud-native apps, scalable clusters, zero-downtime deployment. ✓ Databases: Oracle/PostgreSQL/MySQL, big volume storage (AWS Redshift, AWS Athena/S3, Aurora, Cassandra, HDFS), Redis, MongoDB. ✓ Security: OAuth2, OpenID Connect, JWT, SSO-Single Sign-On, CAS / LDAP ✓ Web: Bootstrap, React, Thymleaf, JavaScript, OAuth, Tomcat, Nginx. ✓ API integrations: REST, SOAP, WebServices, WebSockets, etc. ✓ AWS: Clusters, Kinesis, Athena, Redshift, DynamoDB, Lambda, IoT, SQS/SNS, CloudFront/Route53/ApiGateway, vast AWS API usage, and automation. ✓ Data streaming: AWS Kinesis, Kafka, Camel, RabbitMQ. ✓ Performance optimization: JMeter, JProfiler, AWS X-Ray, GTMetrix, Gatling. ✓ CI/CD: Bamboo, Jenkins, Circle CI, Sonar, pipelines. ✓ Others: Maven, Gradle, Swagger, Linux, Git. 🌟 WHY CHOOSE ME OVER OTHER FREELANCERS? 🌟 ✅ Client Reviews: I focus on providing VALUE to all of my Clients and Earning their TRUST. The Client Reviews and Feedback on my Profile are immensely important to me and the value that I provide. ✅ Over-Delivering: This is core to my work as a Freelancer. My focus is on GIVING more than what I expect to RECEIVE. I take pride in leaving all of my Clients saying "WOW" ✅ Responsiveness: Being extremely responsive and keeping all lines of communication readily open with my Clients. ✅ Resilience: Reach out to any of my Current of Former Clients and ask them about my Resilience. Any issue that my Clients face, I attack them and find a SOLUTION. ✅ Kindness: One of the biggest aspects of my life that I implement in every facet of my life. Treating everyone with respect, understanding all situations, and genuinely wanting to IMPROVE my Client's situations. I am eager to work with you, to provide reliable, consistent, and High-Level solutions to design/development challenges. Please contact me, so we can discuss how we can work together to FULLY meet your Business Needs!

Hi there 👋 I am a senior full-stack software developer with over 5 years of experience, I am proficient in Java, Golang, TypeScript, React, Vue, Node, MySql, and MongoDB. I strive to write high quality code and build scalable and maintainable infrastructure.🎯 I enjoy contributing to OSS, embarking on new challenges and build awesome projects. Please feel free to contact me.😁

As a Senior Backend Engineer and Tech Strategist with over 11 years of experience, I specialize in building scalable, resilient systems that power real-world businesses. I've delivered over $20K in Upwork contracts in the past and am now back with even stronger capabilities — combining traditional backend mastery with cutting-edge AI agent-based automation. I architect and build microservices using Java, Spring Boot, Kafka, Redis, Elasticsearch, and AWS. Whether it’s redesigning monoliths into distributed systems, optimizing high-throughput pipelines, or creating smart automation flows using MCP Server and agentic workflows, I bring deep technical acumen to every project. My code is clean, my systems are bulletproof, and my communication is top-notch. I treat your business like my own and collaborate with product owners and founders to ship results, not excuses. Tech Stack Highlights: Java, Spring Boot, python, nodejs, Kafka, Redis, Elasticsearch AWS (EC2, S3, Lambda, RDS), Docker, Kubernetes MySQL, PostgreSQL, MongoDB, DynamoDB MCP Server, AI Agents, Agentic Workflow Design Let’s work together if you need: Scalable backend systems or microservices Workflow automation using AI agents Performance tuning or infrastructure optimization A reliable, senior-level partner for long-term tech vision

Lead Back-End Engineer | Java + Spring | Building scalable, secure, and investor-ready products For 9+ years, I’ve been helping startups and growing businesses build reliable, fast, and maintainable back-ends that actually support scale — not just run. 💡 What you get working with me: Architecture that lasts: I design solutions that stay clean and efficient even as your product grows. Speed and clarity: Delivering results fast — with clear documentation and full transparency. Cross-domain expertise: Healthcare, E-Commerce, IoT, CRM, E-Learning. I understand business logic, not just code. AI & ML integration: GPT-based and ML-driven systems for smarter automation. Tech stack: Java, Spring (Boot, Security, Data, Batch), Hibernate, PostgreSQL, MongoDB, Redis, Elasticsearch, RabbitMQ, Docker, Jenkins, Linux, GitLab CI/CD. ✅ Bonus: I write clean, test-covered code (JUnit, Selenium) and handle deployment — from staging to production. Let’s turn your concept into a fast, stable, and scalable system. 📩 Message me to discuss your current challenge — I’ll help you find the smartest solution.

I am an experienced Android Developer with 7+ years of building high-quality mobile applications. Today, I combine my strong development experience with modern AI tools to deliver faster, smarter, and cost-effective solutions for clients. Android App Development (Kotlin & Java) - Fast development using AI tools - Clean architecture (MVVM) and scalable solutions - AI integration (chatbots, automation, smart features) - Bug fixing, updates, and performance improvement - MVP and rapid prototyping using Replit Why Work With Me: 7+ years real industry experience Faster delivery using AI-powered development Clean, scalable, and reliable code Clear communication and on-time work I focus on saving your time and cost by using the latest AI tools without compromising quality.

💼 Full-Stack Developer | Java Spring Boot | Python | AI Automation | AI Engineer | AI Agents | Advanced n8n Workflows | Vue JS | Quasar | AI/LLM Solutions | AWS Hi, I’m Naeem — a results-driven Full-Stack Engineer with 6+ years of experience building scalable, enterprise-grade web and mobile applications. I specialize in Java (Spring Boot, Microservices) on the backend and Vue.js / Quasar on the frontend — and I now help businesses integrate AI-powered solutions, automation systems, and LLM applications into real-world production environments. I’ve delivered robust solutions in asset management, budgeting, maintenance systems, and enterprise workflows using clean architecture and modern DevOps practices. 🤖 AI, Automation & n8n Expertise Beyond traditional development, I design and implement intelligent automation systems and AI-driven workflows: ◆ Advanced n8n workflows for business automation ◆ AI-powered end-to-end automation pipelines ◆ LLM-powered applications (OpenAI / Gemini-style integrations) ◆ AI Agents & Agentic workflows (multi-step reasoning systems) ◆ AI + API integrations (CRM, WhatsApp, Email, internal tools) ◆ LangChain-based applications & tool-calling systems ◆ Prompt Engineering & LLM optimization ◆ NLP applications & intelligent data pipelines ◆ AI Security & Responsible AI practices I combine backend engineering + AI + automation to build: ◆ Smart business automation systems ◆ AI-powered dashboards & assistants ◆ Automated lead generation & engagement systems ◆ Intelligent document processing workflows ◆ Custom AI copilots & internal tools ◆ No-code/low-code automation using n8n + AI 🛠 Core Technical Skills Backend: Java 8/11/17, Spring Boot, Microservices, REST APIs, JPA, Hibernate, MySQL Frontend: Vue.js, Quasar Framework, Vuex, Axios Cloud & DevOps: Docker, Kubernetes, Jenkins, AWS, CI/CD AI/ML: Python, Pandas, NumPy, Scikit-learn, TensorFlow, LangChain, LLM APIs Automation: n8n, Webhooks, API orchestration, Workflow automation Other: Excel Import/Export, Security, Localization (EN/FR), System Architecture 💡 What I Bring ✔ Clean, scalable, and maintainable architecture ✔ Strong problem-solving & debugging skills ✔ Real-world AI + automation integration experience ✔ Fast delivery with production-ready quality ✔ Clear and professional communication If you’re looking for a developer who can build robust backend systems + intelligent AI automation + powerful n8n workflows, let’s connect and bring your vision to life 🚀

I help startups and product companies build scalable, high-performance backend systems that handle real-world production traffic without breaking. With 7+ years of experience working with global product companies like New Relic, Appen, and Zoho, I specialize in designing resilient microservices, optimizing slow systems, and building event-driven architectures that scale. 🔹 How I Can Help You ✔ Design & develop scalable Spring Boot microservices ✔ Build event-driven systems using Kafka ✔ Optimize slow APIs (multi-threading, batching, Redis caching) ✔ Improve backend scalability & system performance ✔ REST API development with PostgreSQL / ClickHouse ✔ Kubernetes-based deployments ✔ Production monitoring & observability improvements 🔹 Proven Impact ✔ Reduced Mean Time To Detection (MTTD) by 40% ✔ Improved backend performance by 8x through batching & caching ✔ Reduced manual operations by 60% via workflow automation ✔ Built AI-driven backend systems improving data accuracy by 30% 🔹 What You Can Expect Working With Me • Clean, maintainable, production-ready code • Proper test coverage (JUnit, integration testing) • Performance-first architecture • Clear communication and reliable delivery If you’re building a backend system that needs to scale — or fixing one that’s slowing you down — I’d love to help. Let’s discuss your project.