I am a Senior Software Engineer with a proven track record in designing, developing, and optimizing complex back-end systems. I specialize in Java, microservices, cloud solutions, and financial software development. My goal is to build scalable, secure, and efficient systems that meet the diverse needs of modern businesses. What I bring to the table: • Back-End Development Expertise: Extensive experience with Java (8-21), Spring Boot, and .NET Core in building scalable, high-performance applications. • Financial Systems & Data Processing: I’ve led back-end development for financial market websites and banking systems, including core banking, instant payment systems, and data analytics. • Cloud & DevOps Knowledge: Proficient in cloud-native development on AWS and Azure, coupled with a strong understanding of CI/CD pipelines, using Jenkins, Docker, and Kubernetes. • Scalable Architectures: Deep knowledge in microservices, RESTful APIs, and event-driven systems, ensuring your applications are scalable, maintainable, and future-proof. • Team Leadership: I’ve mentored teams, conducted code reviews, and implemented best practices in software engineering, from development to deployment. • Active Contributor on StackOverflow: With +3K points and a positive impact on 3.4 million users, I regularly contribute to solving technical problems and sharing knowledge with the community. Notable Achievements: • Led major projects for companies like Glovo, ING, and British Petroleum, delivering high-impact, secure solutions. • Contributed to open-source projects like IBAN4j and wrote technical articles for Baeldung. • Passionate about clean code, and consistently improve the development process through automation and agile methodologies. If you’re looking for a seasoned software engineer who understands the intricacies of building and maintaining robust back-end systems with Java and cloud technologies, I would be thrilled to help you turn your vision into reality.

Over 15 years of experience as a software developer, with a strong background in Java and Angular. Proven track record of delivering high-quality web applications on time and within budget. Skilled in working collaboratively in fast-paced, team-oriented environments. Proficient in a variety of development tools, including, Visual Studio, IntelliJ, and Git. Utilize AI-assisted development tools such as OpenCode and ClaudeCode to expedite coding and enhance efficiency. Tech Stack: ✅ Java ✅ Springboot ✅ Angular ✅ React Native ✅ Postgres / Mysql ✅ Typescript ✅ Unit testing / TDD / Spock / JUnit / Jasmine ✅ HTML ✅ CSS ✅ Git ✅ Open Code, Claude Code I can: ✅ Create custom complex websites ✅ Make mobile apps ✅ Automate boring tasks ✅ Create scripts for everyday use ✅ Optimize slow queries

With 4+ years of full-stack development experience, I collaborate with clients and teams on both backend and frontend work, from system design to implementation, deployment and maintenance. Happy to discuss how I can help. 𝗕𝗔𝗖𝗞𝗘𝗡𝗗 ▸ Java (Spring Boot, Microservices) ▸ Node.js (Express.js, NestJS with TypeScript) ▸ Python (Flask, FastAPI, Django) ▸ Go (Gin, gRPC) ▸ RESTful APIs, Microservices ▸ JWT, OAuth 2.0, SSO, Spring Security ▸ RabbitMQ, Kafka 𝗙𝗥𝗢𝗡𝗧𝗘𝗡𝗗 ▸ React, Angular, Next.js, Nuxt.js, TypeScript, JavaScript (ES6+), HTMX ▸ HTML5, CSS3, TailwindCSS, Material UI ▸ Redux, Context API, NgRx 𝗗𝗔𝗧𝗔𝗕𝗔𝗦𝗘𝗦 & 𝗗𝗔𝗧𝗔 𝗠𝗔𝗡𝗔𝗚𝗘𝗠𝗘𝗡𝗧 ▸ PostgreSQL, MySQL, MongoDB, AWS DynamoDB ▸ Firebase, Supabase ▸ Redis Cache, VectorDB (ChromaDB, Weaviate) ▸ Prisma, TypeORM, Hibernate, Drizzle, Flyway, Liquibase, Gorm 𝗗𝗘𝗩𝗢𝗣𝗦 & 𝗖𝗟𝗢𝗨𝗗 ▸ Docker, CI/CD (GitHub Actions, Jenkins) ▸ AWS (EC2, RDS, S3, Lambda), GCP, Azure, DigitalOcean, VPS, NGINX ▸ HTTPS (Certbot, Cloudflare, Let’s Encrypt) 𝗠𝗢𝗕𝗜𝗟𝗘 ▸ Flutter | Dart 𝗔𝗜 𝗧𝗢𝗢𝗟𝗦 ▸ Claude | Cursor | Copilot I work across backend and frontend to build fast, reliable systems. From API design and database tuning to cloud deployment and frontend integration, I focus on practical solutions that support real business needs. Python | Docker | PostgreSQL | Full Stack Development | Flask | MongoDB | Express | Django | React | Node | JavaScript | RESTful API | MERN Stack | Web Development | Frontend Development | Backend Development | Java | Spring Boot | Microservices | Go | Gin | gRPC | JWT | OAuth2 | CI/CD | AWS | GCP | DigitalOcean | Flutter | TailwindCSS | MaterialUI | Next | Nuxt | Vue | Redis | Vector Databases | Prisma | TypeORM | Hibernate | FastAPI | NestJS | API Development | Cloud Computing | DevOps | RabbitMQ | Kafka | LLM | n8n | Kotlin | HTMX | Cursor | Copilot | Cluade

🚀 Building Production-Ready Mobile Apps for Startups, Businesses, and Scalable Digital Products Are you looking for a mobile app developer who can turn your idea into a stable, high-performance iOS and Android product? I am a senior mobile app developer with 5+ years of professional experience and 30+ published apps on the App Store and Google Play. I specialize in building scalable mobile applications using Flutter, Dart, native Android, native iOS, Java, Kotlin, Swift, clean architecture, and modern real-time technologies. My focus is not only on writing code. I design mobile systems that are fast, maintainable, scalable, and ready for long-term business growth. From MVP development to production deployment, I handle the complete mobile app lifecycle, including architecture, UI implementation, backend integration, testing, CI/CD, native configuration, and store submission. 💼 Core Expertise • Flutter & Dart mobile app development • Native Android development using Java, Kotlin, Android Studio, Gradle, ProGuard, and R8 • Native iOS development using Swift, Xcode, CocoaPods, TestFlight, and App Store Connect • Clean Architecture, MVVM, DDD, BLoC, Riverpod, Provider, and GetX • Firebase, Firestore, Auth, Cloud Functions, FCM, Crashlytics, and Analytics • REST APIs, GraphQL, OAuth 2.0, JWT, and secure backend integrations • Offline-first apps using SQLite, Room, Hive, and local storage solutions • Pixel-perfect UI from Figma with Material 3, Cupertino, responsive layouts, and animations ⚡ Real-Time & Advanced App Systems I have strong experience building real-time and communication-based mobile apps, including the following: • WebRTC voice and video calling • Real-time chat and messaging systems • WebSockets, SignalR, and Socket. io-based live data sync • Real-time order tracking, live collaboration, and high-concurrency app flows • Push notifications, deep linking, localization, and accessibility • Native platform integrations for Android and iOS I also integrate AI-powered features into mobile apps, including custom chatbots, LLM-based assistants, AI workflows, and automation tools. I can also improve and refactor AI-generated MVPs from tools like Cursor, Lovable, Bolt, and Replit into clean, production-grade codebases. 📦 What I Can Build for You • Production-ready mobile MVPs for startups • Flutter, Android, and iOS applications • Real-time video, audio, chat, and collaboration apps • Food delivery, hotel booking, e-commerce, marketplace, and enterprise apps • AI-powered mobile applications and chatbot integrations • Legacy app migration to Flutter or modern native architecture • Firebase-backed applications with secure authentication and cloud logic • Payment and subscription systems using Stripe, Apple Pay, Google Pay, and RevenueCat • Location-based apps with Google Maps, Mapbox, tracking, and geofencing • App Store and Google Play deployment with CI/CD pipelines ✅ Why Work With Me? You will get clean, maintainable, and scalable code written with enterprise-level standards. I focus on performance optimization, smooth 60 FPS user experiences, reliable architecture, strong communication, and complete deployment support. I have worked as a senior mobile app developer and team lead, managing production apps, leading mobile teams, building real-time systems, improving release workflows, and delivering apps for clients across multiple industries. Whether you need a new app from scratch, an MVP ready for investors, a real-time communication product, a Flutter app, or native Android and iOS improvements, I can help you build it properly. Let’s turn your idea into a high-performance mobile application. Message me today and let’s discuss your technical requirements.

Hi 👋 I'm a Full-Stack Developer with strong hands-on experience building scalable web, and mobile applications using Java, Node.js, and Next.js. I focus on writing clean, maintainable code, designing reliable architectures, and delivering production-ready solutions that perform well and scale as your business grows. What I do best - Build full-stack applications from scratch or improve existing systems - Design and develop REST APIs and backend services (Java, Node.js) - Create modern, responsive frontends with React and Next.js - Develop web and mobile applications with a performance-first mindset - Optimize databases, APIs, and application performance - Debug, refactor, and stabilize complex codebases How I work - Clear communication and realistic timelines - Clean architecture and best practices (no shortcuts) - Focus on long-term maintainability, not just “making it work” - Comfortable working independently or inside an existing team If you're looking for a developer who can own features end-to-end, understand both backend and frontend concerns, and deliver reliable results, I'd be happy to discuss your project. Let's build something solid. 🚀

Hello there! 👋 I'm a seasoned senior backend developer with over 5+ years of expertise in crafting sophisticated business systems. In my capacity as a Senior Backend Development Engineer at ByteDance Inc., the powerhouse behind TikTok, I've harnessed the power of Golang, Java, Python, and C++ to engineer recommendation systems tailored to elevate the TikTok short video experience. What I bring to the table for you: 🚀 Free consultation: Delighted to provide insights based on hands-on experience with your project. 🛠 Project development: Proficient in Golang, Python, and Java, well-versed in their ecosystems and renowned frameworks. Services include API development, code refactoring, system design... 🔧 DevOps engineering: Well-acquainted with Kubernetes and Docker, with hands-on experience in open-source projects utilizing these for seamless deployments. Eager to collaborate and create brilliance together! 💻🌟

I architect and deliver production ready systems that scale from day one, boosting profits while reducing costs. With 15+ years across telecom, logistics, and enterprise platforms, I specialize in turning complex requirements into clear, working backends. What I Specialize In System Architecture & Backend Development → Java, Spring Boot, APIs, Microservices, Distributed Systems Event-Driven Platforms → Apache Kafka, Redis, PostgreSQL, MongoDB, Neo4j Modernization Blueprints → phased cutovers from legacy stacks to microservices & cloud-ready systems First Production Slice Delivery → APIs, event contracts, CI/CD pipelines, observability, and clear documentation baked in How I Help You • From scratch: I’ll turn your idea into a clear architecture and working first slice in production. • Production-focused: I’ll deliver real systems that scale safely, not endless PoCs. • Slice-by-slice growth: Add features safely while keeping every step operable. • Legacy modernization: I’ll blueprint your modernization so you move to APIs/microservices without risky rewrites. Outcomes Delivered • Cut telecom API latency from 3s → 200ms • Built topology graph platform unifying 30+ inventory feeds • Migrated monolith to Kafka microservices powering 50M+ daily transactions • Cut server costs by 60% through microservices rightsizing and caching strategies • Reduced customer onboarding time from 3 days to 2 hours through API automation • Eliminated system crashes during 10x traffic spikes through proper load balancing Why hire me I’m not here to “just code features.” I architect and build the first production slice that your team can scale confidently. Whether you’re designing new systems or modernizing legacy ones, I help you move forward with clarity and confidence.

🚀 Full-Stack Developer | SaaS Platforms | CRM Systems | Dashboards | AI Integrations I am a Full-Stack Developer with 9+ years of experience building scalable web applications, SaaS platforms, CRM systems, and analytics dashboards. I specialize in combining robust backend architectures, modern frontend frameworks, and AI-powered integrations to deliver high-performance and scalable solutions. 💻 Technical Expertise Full-Stack Development Backend: Node.js, NestJS, Laravel, PHP, Java, Spring Boot Frontend: React.js, Next.js, Vue.js, TypeScript RESTful & GraphQL API development Monolithic and Microservices architectures CRM & SaaS Development Custom CRM systems with role-based access, workflow automation, and analytics Multi-tenant SaaS platforms with subscription billing (Stripe, PayPal) Admin panels, dashboards, and reporting systems Dashboards & Data Analytics Real-time dashboards using Chart.js, Recharts, and D3.js KPI monitoring, reporting tools, and large dataset optimization AI / ML Integrations OpenAI, TensorFlow, HuggingFace, AWS AI services Chatbots, recommendation engines, and predictive analytics AI-powered automation and intelligent workflows Cloud & DevOps AWS (EC2, S3, RDS, Lambda, CloudFront) and GCP CI/CD pipelines with GitHub Actions, Jenkins, GitLab Docker, Kubernetes, Redis, and performance optimization 🛠 Technologies Java • Spring Boot • Microservices • MySQL • REST APIs React (Redux) • JavaScript • Bootstrap • Material UI Google Maps API • Facebook API Payment Gateways: Stripe, PayPal 📊 Industry Experience Healthcare • E-commerce • Tourism • Recruitment Systems • Food Delivery • CRM Platforms • Jewelry & Luxury Goods 💼 Professional Strengths ✔ Strong problem-solving and architecture design ✔ Clear understanding of business requirements ✔ Excellent communication and collaboration skills ✔ Proven ability to deliver scalable, production-ready solutions 🎯 Objective To contribute my technical expertise to innovative projects while continuously learning and delivering impactful digital solutions. Best Regards, Manoj Kumar Sharma

Experienced Software Developer with 10+ years in the software industry. Proficient in requirement analysis, design, implementation, testing, and management of complex software applications. Committed to delivering enterprise level software solutions with exceptional performance driven by a passion for technical innovation, consistently creating world class software applications and products. My expertise spans across cloud infrastructure, containerization, continuous integration and deliver pipelines, and automated deployment solutions. I focus on delivering high-performance, scalable solutions, while collaborating closely with teams to foster technical innovations. ⚙️ Strong knowledge of Agile Software Development process (Scrum, Waterfall, Hybrid, Agile) and Code Review processes in projects of different scale. 🤝Team player, now how to successfully interact with architects, engineers, and product management to deliver user-friendly and visually appealing results. ⭐ Enjoy producing clean, well-written and highly efficient code on my projects. Also I’m convinced that good communication is a key for creating successful products. Key technologies: ✅ Java 8/11/15/17/21 ✅ Kotlin ✅ Python ✅ GoLang ✅ Spring Boot/Spring Cloud ✅ PostgreSQL / MySQL / MariaDB / Cassandra ✅ MongoDB /Redis ✅ Apache Kafka / RabbitMQ ✅ Keycloak/ Oauth2 / Auth0 / AWS Congito ✅ Maven / Gradle ✅ WebSocket / RSocket ✅ Docker / Podman ✅ Kubernetes ✅ Ansible ✅ Terraform ✅ CI/CD (GitLab CI, GitHub Actions) ✅ Shell Scripting ✅ RESTful APIs/GraphQL/RPC ✅ LLM / AI Agents / Claude Code Key Qualifications: ⭐ Expert understanding of any programming language and trending technology ⭐ Understand needs of company of any scale ⭐ Microservices development with even driven architecture ⭐ High-performance, maintainable and reusable code ⭐ Self-starter, hard worker, organized, attentive to details and a team player ⚙ Requirements Analysis & Solution Design ✅ Led requirement analysis sessions to capture and refine technical requirements, translating them into clear, actionable development objectives. ✅ Designed scalable backend architectures using Java and Spring Boot, implementing core application logic, business services, and data layers aligned with project requirements. ✅ Defined and established RESTful API standards to ensure seamless communication between services, enforcing best practices for reliability and performance. ⚙ Building Enterprise-Level Applications ✅ Developed and maintained complex backend services, ensuring high availability and fault tolerance, crucial for enterprise-level applications with strict uptime demands. ✅ Leveraged Spring Boot with frameworks like Spring Data JPA (with Hibernate and MyBatis) and QueryDSL to build efficient data access layers, improving data retrieval speeds and reducing latency. ⚙ Database Management & Optimization ✅ Designed relational and NoSQL database schemas using MySQL, PostgreSQL, MongoDB, and Redis, aligning data structures with application needs for optimal query performance and scalability. ✅ Conducted database performance tuning by implementing indexing, query optimization, and data sharding, improving system efficiency and reducing response times for high-traffic applications. ⭐ DevOps Integration & Deployment ✅ Orchestrated automated CI/CD pipelines using GitLab CI and GitHub Actions, achieving consistent and efficient deployment processes across development, staging, and production environments. ✅ Managed containerized application deployments on Docker and Kubernetes, improving scalability and simplifying resource management in cloud-hosted environments. ⚙ Performance Optimization & Troubleshooting ✅ Optimized backend applications for low latency and high throughput, using caching strategies with Redis and implementing efficient concurrency handling within Java. ✅ Developed comprehensive monitoring and alerting systems to proactively address and troubleshoot production issues, utilizing tools like Prometheus and Grafana to identify bottlenecks and optimize system performance. ⚙️ Key Projects: ⭐ High-Performance E-commerce Platform Backend ✅ Built a scalable backend for a high-traffic e-commerce platform, handling thousands of concurrent transactions with Java, Spring Boot, and PostgreSQL. ✅ Utilized Redis for caching to optimize data retrieval times and reduce server load, achieving a 30% improvement in page load times. ⭐ Microservices Migration for Legacy System ✅ Led the migration of a monolithic application to a Microservices architecture, improving system scalability and maintainability. ✅ Implemented an event-driven communication system using Apache Kafka for efficient inter-service communication, achieving asynchronous data processing with high reliability. ⭐ Real-Time Analytics Dashboard ✅ Developed backend services for a real-time analytics dashboard, enabling users to visualize key metrics and monitor live data.

Software solutions professional with above 17 years of experience, on analysis, design and coding of web based projects using JEE technology. I began as a C++ programmer, but have evolved into a JEE professional, having act as a programmer, analyst, and lead on diversity of JEE projects. I also have experience as a software architect, both in real world and in theoretical world, being a teacher on a local university.