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.

Hi, I’m Rakesh — a full-stack developer with over 9 years of experience building scalable web and mobile applications. I specialize in taking projects from idea to launch, and I’ve helped startups and enterprise teams do just that across a range of industries—healthtech, fintech, and event management. 🔹 What I bring to your team: ✅ Expertise in Java, Spring Boot, Angular, Flutter, and AWS ✅ Proven track record of building end-to-end products with solid backend architecture and clean UI ✅ Familiarity with microservices, OAuth2, RESTful APIs, and cloud-native deployments ✅ Strong product instincts from working as Founder/CTO and Lead Developer on multiple apps 🔹 Notable Work: 🏆 Built BeeBloom, a health rewards app with 40K+ downloads and featured by Google AppScale 🔧 Led development of EventReply, a cross-platform event management tool (2023–Present) 🛠️ Architected Beadpay, a cryptocurrency payments solution with real-time transaction flow If you’re looking for a reliable developer who can write clean, maintainable code and understand the bigger picture of product success, let’s talk.

Results-driven Full Stack Developer with 9+ years of experience delivering 30+ successful projects for global clients. I specialize in building scalable, secure, and high-performance applications using modern technologies and cloud platforms. 🔧 Core Expertise Backend: Java, Kotlin, Spring Boot, Python Frontend: Angular, React, Vue.js, HTML5, CSS3 Cloud: AWS, Azure, Google Cloud DevOps: Docker, Kubernetes, Jenkins, GitHub Actions Messaging & Integration: Kafka, RabbitMQ, REST, SOAP Databases: PostgreSQL, MySQL, MongoDB, Firebase, DynamoDB Tools & CI/CD: GitLab CI, Bitbucket Pipelines, Maven, Gradle Security & APIs: OAuth2, JWT, GraphQL, Swagger Testing: Unit & Integration Testing (TDD) ✅ Highlights 9+ years in full-stack development Expert in microservices & RESTful APIs Hands-on with CI/CD, containers & DevOps Strong collaboration & communication skills Focused on clean, maintainable, scalable code

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.

I am a Senior Java and Backend Developer with more than 12 years of experience building scalable enterprise applications and SaaS platforms. My core expertise is in Java, Spring Boot, Node.js, and TypeScript, where I design and deliver robust backend systems, microservices, and integrations for startups and Fortune 500 companies. I specialize in backend development, API design, database optimization, and cloud-native architectures, with a proven track record of delivering production-ready solutions. Available 40 hours per week across EST, PST, BST, and CET. 🔹 Core Backend Expertise Java (8, 11, 17): Streams, Lambdas, Concurrency, Functional APIs Python: Django, Flask, FastAPI Node.js, Express.js, TypeScript (clean, strongly-typed code) Frameworks: Spring Boot, Spring Cloud, Spring Security, Hibernate, JPA, Java EE (EJB, Servlets, REST, SOAP) Microservices: REST APIs, distributed systems, event-driven architectures Databases: PostgreSQL, MySQL, Oracle, MongoDB, Redis, Prisma ORM Messaging & Integrations: Kafka, RabbitMQ, ActiveMQ Security: OAuth2, JWT, encryption, secure data flow 🔹 Full Stack Development (Supporting Experience) MERN (MongoDB, Express, React, Node.js) MEAN (MongoDB, Express, Angular, Node.js) React.js, Angular, Vue.js for modern frontends Next.js and Node.js for full stack applications HTML5, CSS3, Bootstrap, Tailwind CSS, jQuery for responsive interfaces TypeScript & JavaScript (ES6+) with Redux, Context API 🔹 Cloud & DevOps AWS: EC2, S3, RDS, Lambda, IAM, Elastic Beanstalk, CloudFormation CI/CD & Containers: Docker, Kubernetes, Jenkins, GitHub Actions, GitLab CI Cloud-native systems with high availability, scalability, and performance optimization ✅ Why Clients Choose Me 12+ years backend-first expertise in Java, Spring Boot, Node.js, and Express Strong TypeScript coding practices with focus on scalability Full stack capabilities with MERN and MEAN stacks Skilled in enterprise-grade solutions, SaaS platforms, and microservices Experienced in distributed teams across multiple time zones If you need a backend-focused developer who also brings Java expertise and full stack knowledge, I can help you build reliable, secure, and scalable solutions. Keywords: Senior Java Developer, Backend Developer, Node.js, Express.js, TypeScript, MERN, MEAN, React.js, Angular, Vue.js, Next.js, Spring Boot, Spring Cloud, Spring Security, Hibernate, JPA, Java EE, Microservices, REST API, SOAP API, API Development, PostgreSQL, MySQL, Oracle, MongoDB, Redis, Prisma, Secure APIs, OAuth, JWT, AWS, Cloud, Docker, Kubernetes, CI/CD, GitHub Actions, Jenkins, GitLab CI, Kafka, RabbitMQ, ActiveMQ, Event-Driven Architecture, SaaS, Enterprise Applications, Scalable Systems, High Availability, Performance Optimization.

Hi, I’m a dedicated Android & iOS developer with 3 years of experience building practical, user-friendly apps. I specialize in Java, Kotlin and the Android SDK, and I follow best practices using MVVM architecture, Firebase, and REST APIs. 😎 In addition to native Android development, I have strong experience in cross-platform app development using Flutter and FlutterFlow. I’ve built and deployed scalable apps for both platforms, integrating Firebase services like Authentication, Firestore, Cloud Messaging, and Analytics to power real-time, secure, and engaging user experiences. Tech stack/Latest experience: ✅ Flutter: Cross-platforming development of IOS/Android applications. ✅ Android: Crafting seamless and intuitive mobile experiences for the Android platform. ✅ React & Angular: Designing responsive and feature-rich web applications using popular frontend frameworks. ✅ Java 17: Harnessing the power of Java to build robust and scalable mobile applications. ✅ Kotlin: Utilizing Kotlin's modern features for efficient Android development. ✅ Spring & Spring Boot: Developing scalable and high-performance web applications with the Spring framework. ✅ REST: Building RESTful APIs for seamless communication between web services. ✅ Quarkus: Leveraging Quarkus for lightweight and fast Java-based microservices. ✅ Kafka: Implementing event-driven architecture for real-time data processing and streaming. It would be great to speak more with you and receive the necessary info about the rapid job with short timeline or comprehensive and high-complexity long-term project. Now I am expanding my portfolio, a lot of works under NDA – so for now I need to create an Upwork portfolio – and apply my 10+ years high-level experience 🤩 Let's have a quick talk and discuss everything! 🤝

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.

I am a Backend Engineer specializing in Java and Kotlin, combined with Cloud and Infrastructure expertise, helping businesses build reliable, scalable, and production-ready backend systems. I don’t just write backend code—I design systems that run smoothly in real cloud environments. From API development to deployment and operational stability, I ensure that backend services are built with performance, scalability, and long-term maintenance in mind. This allows clients to reduce technical risk while accelerating delivery. With hands-on experience across backend development and cloud infrastructure, I act as a bridge between development and operations, making sure applications are not only functional, but truly production-ready. What I Can Help You With - Backend API development using Java & Kotlin - Cloud-based service architecture and deployment - Designing scalable, maintainable backend systems - Improving performance, stability, and deployment workflows - Supporting existing systems and modernizing legacy backends Core Technology Stack Backend & Language - Java (Spring, Spring Boot) - Kotlin (Spring Boot, Kotlin-based backend services) - RESTful API design - Clean Architecture & layered design Database & Data Handling - PostgreSQL / MySQL - JPA / Hibernate / MyBatis - Transaction management & data integrity - Query optimization and indexing Cloud & Infrastructure - AWS (EC2, RDS, S3, IAM, Load Balancing) - Docker & containerized deployments - Basic Kubernetes / container orchestration understanding - CI/CD pipelines (GitHub Actions, GitLab CI) Operations & Reliability - Environment configuration and deployment strategies - Logging & monitoring concepts - Performance and scalability considerations - Production issue troubleshooting Why You Choose Me Understand both backend development and cloud infrastructure Build systems that are easy to operate and scale Focus on long-term maintainability, not just short-term fixes Communicate clearly with both technical and non-technical stakeholders Instead of handing over code that “works only on my machine,” I deliver backend solutions that are ready to run reliably in real-world environments. Ideal Projects - Cloud-based backend services - API-driven platforms - Java system modernization with Kotlin - Startups needing a backend engineer who understands operations - Long-term backend support and improvement

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!

Most developers build features. I build systems that survive scale. Over the past 6 years I have shipped production ready platforms across fintech, eCommerce, education, and enterprise not as a hired hand executing specs, but as a technical partner who owns the outcome from architecture decision to post launch performance. What I Actually Deliver ↗ 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗪𝗲𝗯 & 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 React, Next.js, Vue, Angular, React Native, Flutter pixel perfect frontends backed by fast, reliable APIs. I build for performance, Core Web Vitals, and SEO from day one, not as an afterthought. ↗ 𝗔𝗜 & 𝗟𝗟𝗠-𝗣𝗼𝘄𝗲𝗿𝗲𝗱 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀 I integrate OpenAI, LangChain, RAG pipelines, and vector databases (Pinecone, Weaviate) into real products not demos. Think intelligent search, AI-assisted workflows, document processing, and custom AI agents built to production standards. ↗ 𝗥𝗼𝗯𝘂𝘀𝘁 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 Python (FastAPI, Flask), Java (Spring Boot), Node.js (NestJS) I design REST and GraphQL APIs and microservice architectures that handle real traffic without brittle single points of failure. ↗ 𝗖𝗹𝗼𝘂𝗱, 𝗗𝗲𝘃𝗢𝗽𝘀 & 𝗗𝗮𝘁𝗮 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 AWS, GCP, Azure, Docker, Kubernetes, CI/CD pipelines. PostgreSQL, MongoDB, Redis, DynamoDB. I build and automate the infrastructure so your team doesn't inherit technical debt. ↗ 𝗪𝗲𝗯𝟯 & 𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 (𝗪𝗵𝗲𝗻 𝗜𝘁'𝘀 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗧𝗼𝗼𝗹) Solidity smart contracts, Ethereum dApps applied where blockchain genuinely adds value, not as a buzzword. 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 Before writing a line of code, I make sure we agree on scope, success metrics, and delivery milestones. You get weekly progress updates, async-friendly communication, and a clean handover with documentation. No surprise delays, no scope-creep ambushes. I have delivered MVPs in weeks and scaled those same platforms to handle millions of requests because scalable architecture is baked in from the start, not bolted on later. 𝗔 𝗙𝗲𝘄 𝗧𝗵𝗶𝗻𝗴𝘀 𝗧𝗵𝗮𝘁 𝗦𝗲𝘁 𝗠𝗲 𝗔𝗽𝗮𝗿𝘁 • Top Rated Plus consistently in the top tier of Upwork's global talent • AI-enhanced development workflows that cut delivery time without cutting corners • Experience across the full product lifecycle: MVP → growth → scale • Clear, proactive communication across time zones If you need a developer who treats your product like their own and delivers systems built to last let's talk.