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OCJP Certified Java Architect | Spring Boot | Microservices | AWS | Kafka | Camunda | 13+ Years Experience With 13+ years of professional experience in designing, developing, and deploying enterprise-grade applications, I help businesses build scalable, secure, and high-performance cloud-native solutions. My expertise spans Java, Spring Boot, Microservices Architecture, AWS Cloud, Kafka, Redis, Docker, Kubernetes, CI/CD, OAuth2, Keycloak, JWT, and Camunda BPM. Key Highlights: ✔ OCJP Certified Java Professional ✔ 12+ Years of Software Development Experience ✔ Microservices & Cloud-Native Architecture Specialist ✔ Banking & FinTech Domain Expertise ✔ RESTful APIs, Event-Driven Systems, and Distributed Architecture ✔ AWS Cloud Deployment & DevOps Automation ✔ Security Implementation with OAuth2, JWT, Keycloak, LDAP, and Okta Recent Accomplishments: ✅ Designed and implemented cloud-native microservices using Java, Spring Boot, Spring Cloud, Docker, and Kubernetes. ✅ Built FinTech and Banking solutions integrating payment gateways and remittance platforms, including Stripe, RIA, and Instant Cash Exchange House APIs. ✅ Developed high-performance event-driven architectures using Kafka and Redis for real-time processing and scalability. ✅ Automated deployment pipelines using Jenkins, Docker, Kubernetes, SonarQube, and Git-based CI/CD workflows. ✅ Implemented workflow orchestration and business process automation using Camunda BPM. AI-Assisted Development: I effectively leverage AI tools such as ChatGPT and GitHub Copilot to accelerate development productivity by 60–80% through: • Business rule analysis and API design • Schema and ORM modeling • Rapid endpoint generation • Code completion and refactoring • Automated code reviews and quality improvements • Technical documentation generation Core Technologies: • Java, Spring Boot, Spring Framework, Spring Cloud, Hibernate, JPA, Camunda, GraphQL, WebSockets • Kafka, RabbitMQ, Redis, Docker, Kubernetes • MySQL, Oracle, PostgreSQL, MongoDB, Elasticsearch • AWS (EC2, ECS, RDS, S3, IAM, SQS) • OAuth2, JWT, Keycloak, LDAP, Okta, Spring Security • React, Angular, TypeScript, JavaScript • Jenkins, Git, Maven, SonarQube, Jira I am passionate about building reliable, scalable, and secure enterprise solutions that deliver measurable business value. Let's discuss how I can help your team accelerate development, modernize architecture, and successfully deliver high-quality software solutions.

Need a backend, full-stack, or AI system that holds up in production, not just on a demo branch? That's what I do. I'm a senior software engineer with 6+ years building web apps, desktop products, data platforms, and enterprise integrations for clients in the US, Canada, and Europe. Clients usually come to me with one of these problems: - "Our API is slow or falls over under load." I profile it, fix the queries and caching, and add retries, idempotency, and monitoring so failures stop reaching your users. - "We need a real product, not a prototype." Secure auth, roles and permissions, billing, background jobs, licensing, automated tests, and CI/CD are part of the build, not a phase two. - "We want AI over our own documents but it keeps answering wrong." I build RAG pipelines with hybrid search, reranking, and measured retrieval quality so answers are traceable. - "Our legacy mainframe code needs to run somewhere modern." I deploy and repair COBOL/CICS/DB2/JCL systems on z/OS and IBM Cloud. WHAT I WORK WITH Backend: .NET Core, Python, FastAPI, Node.js, REST APIs, Clean Architecture, CQRS, Kafka, MassTransit, SignalR, Hangfire Frontend: Angular, React, Next.js, TypeScript, RxJS, NgRx, Tailwind, Material UI Data: PostgreSQL, SQL Server, MongoDB, Redis, Qdrant, pgvector AI: RAG, LangChain, OpenAI, Cohere, hybrid vector + BM25 search, reranking, evaluation Cloud and DevOps: AWS, Azure, IBM Cloud, Docker, GitHub Actions, Azure DevOps, xUnit, pytest Mainframe: z/OS, COBOL, CICS, DB2, VSAM, JCL WHAT I'VE DELIVERED - A multi-tenant vendor risk platform covering supplier onboarding through audits and remediation, with enterprise SSO, granular permissions, Stripe billing, and AWS deployment. - Three years on a freight-forwarding ERP: 1,000+ endpoints, 25+ carrier and accounting integrations, and the full rate-to-shipment lifecycle. - A licensed Windows and macOS desktop product with signed entitlements, offline grace periods, and crash-recovery testing. - A multilingual vehicle-manual chatbot with intent classification and an automated retrieval-evaluation harness. - Technical leadership of a 6-developer team across architecture, estimation, and releases. HOW I WORK I plan carefully before writing code, clarify anything that is unclear, and provide an honest estimate before development begins. I will also tell you early if an approach is risky or unlikely to work. You will receive working increments that you can review throughout the project - not a month of silence followed by unexpected results. I always take ownership of project and meet the deadline I commit to. I have maintained a 100% Job Success Score and delivered more than 2,400 hours of work on Upwork. Some of my project details are in my portfolio and work history below. Send me your requirements, and I will reply with a clear technical approach, the main trade-offs, and a realistic delivery timeline.

⭐ TOP-RATED 💯 Percent Job Success ⭐ 5+ Years Experience ⭐ Senior Software Engineer ⭐ Oracle Certified Professional (OCP) ⭐ Oracle Certified Associate (OCA) Hello there! 🌟 I'm Shahariar, your seasoned Senior Software Engineer, armed with over 5 years of expertise in Web development, Cloud Engineering, Data Scraping, and Machine learning. I specialize in crafting Dynamic web applications and seamlessly navigating through intricate, data-intensive projects. 🚀 🏆 What Sets Me Apart: ❤️ I'm Devoted to Delivering Quality and Building Long-term Relationships ✅ I'm Punctual, Responsive, and a Breeze to Communicate With ✅ I Excel in Remote Collaboration Tools ✅ I'm Detail-oriented with a Swift Learning Curve 🚀 Key Proficiencies: ✅ Java: Spring, Hibernate, Spring Boot, Spring Security, Spring Batch, Thymeleaf, Jasper Report ✅ JavaScript: NodeJs, NestJs, ReactJs, VueJS ✅ Python & ML: Flask, Django, Beautiful Soap, Bash scripting, NumPy, Pandas, Seaborn, Matplotlib, OpenCV, scikit-learn, Tensorflow ✅ Scala: Play, Lift ✅ Stack: MERN, MEAN ✅ Database Management: PostgreSQL, MySQL, Oracle, MongoDB, FireStore, BigQuery, DataLake ✅ Cloud Platforms: Google Cloud, Azure, AWS, DigitalOcean, Heroku ✅ Testing Frameworks: JUnit, Mockito, Spock, Jest, Puppeteer, Karma, Gatling ✅ DevOps & Other Tools: Docker, Kubernetes, Jenkins, Kafka, ElasticSearch, GraphQL, CI/CD Let's turn your ideas into digital masterpieces! Explore my profile, dive into my notable projects, and envision the incredible possibilities. I'm here, ready to bring your vision to life. Let's embark on this journey together! 🚀

A friendly developer who loves to talk without using cliches, buzzwords and jargon wherever possible. Thus, I love to think, collaborate and communicate like a realistic person to help my clients. Enthusiastic and driven professional with two years of hands-on expertise navigating the boundless data landscape using AWS Athena. Proficient in developing AWS Athena Connector to craft insightful queries and optimizing data retrieval, I've honed my skills in transforming complex data sets into actionable insights effortlessly. Leveraging AWS Athena, I specialize in unlocking the potential of vast data stores, empowering decision-makers with timely and accurate information. My journey with Athena isn't just about querying data; it's about sculpting narratives from raw information, driving efficiency, and illuminating pathways to success. I am the catalyst for data alchemy, adept at orchestrating intricate ETL pipelines that breathe life into complex datasets. My tenure spans creating, optimizing, and fine-tuning Glue jobs, steering diverse data sources through the transformation. Unveiling Hidden Patterns With an eagle eye for detail, I uncover hidden patterns and trends within data labyrinths, employing AWS Glue's capabilities to sculpt cohesive data structures. My knack lies in not just taming data but enabling it to narrate compelling stories. My journey with AWS Glue isn't just about the present; it's about sculpting a future where data reigns supreme. I'm poised to evolve alongside the ever-changing data landscape, pioneering new techniques to extract value from every byte. I truly enjoy working with a small to large & challenging projects to solve complex business problems. And that’s how I help my clients from startups to enterprises to accelerate their objectives. I am only available to work on hourly basis. I welcome AWS Athena, and Glue project of any size

10+ years of solid experience in web application and back-end REST API and SOAP Web services development. Have extensive knowledge in cutting edge technologies in Java, Php, Python, Go, Kotlin. Experienced in SQL, NoSQL and In Memory databases. Experienced in working with Big Data technologies like Apache Spark. Have expertise in working with search engine like Elasticsearch. Expertise in working with Distributed Streaming Platform like Kafka. I have expertise in writing APIs for MiNIO and Amazon S3 object storage. I have been working with one of the best Software Companies in Bangladesh using latest technologies.

Hello! I'm Feroz Ahmmed, an experienced Senior Developer with 6+ years of expertise in building robust and scalable web applications. My skill set spans across Java, Spring Boot, Angular, React, Python, and FastAPI. I specialize in creating high-performance backend systems, designing APIs, and ensuring secure and scalable solutions. Having worked with renowned clients, including remote teams in France, I have extensive experience with microservices architecture, cloud technologies like AWS, and CI/CD pipelines. I'm proficient in leveraging MongoDB, PostgreSQL, and MySQL for efficient database management. My projects often involve advanced techniques such as asynchronous programming, event sourcing, and CQRS, ensuring fast, reliable, and secure applications. Key Strengths: Strong backend development with Spring Boot and Java (V:8,12,17). Skilled in frontend technologies like Angular and React. Expertise in microservices architecture and containerization using Docker and Kubernetes. Experience with real-time data updates, leveraging Google Firebase and WebSocket. Deep understanding of cloud platforms, with hands-on experience in AWS and Elastic Beanstalk. AI/ML knowledge, including integration with PandasAI for data-driven insights. Experience Highlights: Led the backend development for a multi-vendor restaurant application, significantly improving efficiency (90%) and enhancing the user experience. Integrated secure payment systems with Stripe and implemented multilingual support using Google Translator. Improved system performance by implementing async programming, reactive caching, and real-time updates. Skills: 1. Backend Development: Java, Spring Boot (v8, 12, 17,21,25) 2. Frontend Development: Angular, React 3. Microservices: Architecture, Docker, Kubernetes 4. Cloud Technologies: AWS, Elastic Beanstalk 5. Databases: MongoDB, PostgreSQL, MySQL 6. Real-Time Data: Google Firebase, WebSocket 7. Asynchronous Programming: Event Sourcing, CQRS 8. AI/ML: PandasAI, Data-Driven Insights 9. CI/CD: Jenkins, GitLab CI 10. Payment Integration: Stripe, Multilingual Support I am a fast learner, always adapting to new technologies to bring creative, reliable solutions. I thrive in fast-paced environments and am committed to providing excellent service with a focus on delivering high-quality code. Whether you're looking for a developer to join your team or need assistance with a specific project, I'm here to help! Let’s collaborate to build the next big thing. Feel free to reach out for a consultation, and let's discuss how I can help your business succeed.