Hire the Best Apache Zeppelin Engineers

With 18+ years of experience, I specialize in building robust, scalable, and high-performance Java-Spring applications, as well as modernizing and optimizing existing systems. My expertise spans end-to-end development, architecture redesign, performance tuning and bug fixing. eCommerce Expert: 10+ years specializing in SAP Hybris/Commerce Cloud and IBM WCS Technical Depth: Hands-on experience with Spring Microservices, Cloud architectures (GCP), and modular application design I deliver reliable, high-quality solutions with a focus on stability, client satisfaction, and lasting professional relationships. Hands-on experience with the following tools and frameworks: Languages & Frameworks - Java 8/11/17/21 - JSP, Servlet - Spring MVC, Spring Boot, Spring REST, Spring Batch, Spring JPA, Spring Security) - XML/XSL - Struts 1.2 - EJB 2.0 / 2.1 / 3.0 - JSF JPA - Hibernate - MyBatis Frontend - React Js - Angular eCommerce Platforms - IBM WebSphere Commerce (WCS) - SAP Hybris Commerce Messaging & Streaming - Apache ActiveMQ - Apache Kafka - Apache RabbitMQ Application Servers - WebLogic - JBOSS - Apache Tomcat Databases - Oracle - DB2 - MySQL - MongoDB - Postgres - SQL Server Reporting - iReport - JasperReports Search - Apache Solr - ElasticSearch Cache - Redis - Memcached Payment Integration - CyberSource Scheduling - Quartz Scheduler Build, Logging - ANT - Gradle - Maven - Log4j Code Quality - SonarQube - PMD - CheckStyle - FindBugs/SpotBugs - JaCoCo - Cobertura DevOps Tool - Git/GitHub - CVS - SVN - IBM ClearCase - Jenkins - Docker Web Services - Apache Axis - SOAP - WSDL API testing and collaboration tool - Postman - Swagger Testing Framework - JUnit - Groovy - Mockito Feature and Bug Tracking - Trackit Record - JIRA - Rally IDEs & Development Tools - Eclipse - IntelliJ - IBM RAD - TOAD - SQL Developer - Cygwin - Putty - JMX Console Looking forward to collaborating! Thanks & Regards, Sanjay

I’m a Senior Software Engineer with 6+ years of experience building reliable web applications, desktop applications, backend systems, AI solutions, data platforms, and enterprise integrations. My main stack includes .NET, Python, Angular, React.js, Next.js, PostgreSQL, SQL Server, MongoDB, Kafka, and Redis. I also work with RAG, LangChain, web crawling, data extraction, real-time systems, and IBM mainframe technologies. I focus on software that works reliably in production—not just in development. This includes secure authentication, licensing, background processing, idempotent webhooks, message queues, crash recovery, automated testing, and CI/CD pipelines. I have led engineering teams and delivered solutions for clients in the US, Canada, and Europe across SaaS, logistics, fintech, automotive, and airline systems. ## What I Can Help With **Backend Development** * ASP.NET Core, Python, FastAPI, REST APIs * Clean Architecture, CQRS, MediatR, and modular systems * Kafka, MassTransit, transactional outbox, retries, and idempotency * PostgreSQL, SQL Server, MongoDB, Redis * SignalR, Hangfire, Quartz, JWT, OIDC, Keycloak, and RBAC **Frontend** * Angular, React.js, Next.js, and TypeScript * RxJS, NgRx, TanStack Query, Tailwind CSS, Material UI * Storybook, Playwright, MSW, and accessibility testing **AI and RAG** * End-to-end RAG pipelines * Document ingestion, chunking, embedding, and indexing * Hybrid vector and BM25 search * Reranking, intent classification, and multilingual retrieval * LangChain, Qdrant, pgvector, OpenAI, Cohere, and MCP * Retrieval evaluation using recall@k **Data Extraction and Automation** * Web crawlers and data extraction from public websites * Browser automation and scheduled processing * Data cleaning, normalization, and deduplication * Kafka-based streaming and real-time data pipelines **Cloud and DevOps** * AWS, Azure, IBM Cloud, Cloudflare, and Render * Docker, GitHub Actions, Azure DevOps, and CI/CD * xUnit, pytest, Testcontainers, integration tests, and monitoring ## Selected Work **Third-Party Risk Management Platform — .NET, React, PostgreSQL, AWS Built a multi-tenant vendor risk platform covering supplier onboarding, assessments, evidence review, risk registers, audits, remediation, offboarding, and PDF certification. Also implemented enterprise SSO, granular permissions, Stripe billing and quotas, SignalR notifications, Hangfire jobs, Redis caching, external security integrations, reporting dashboards, and AWS ECS deployment. **BizXtract — .NET Desktop and Licensing Platform** Built a Windows and macOS desktop product with device-based licensing, Ed25519-signed packages, offline grace periods, subscription validation, webhook processing, in-app updates, and crash-recovery testing. **Vehicle Manual RAG Chatbot — Python and FastAPI** Built a multi-tenant RAG platform using hybrid search, reranking, multilingual detection, multiple intent classifiers, and an automated evaluation system for measuring retrieval quality. **Admin Platform and Mobile Backend — .NET, PostgreSQL, and Kafka** Developed a modular backend with CQRS and a transactional outbox, along with a React and Next.js admin portal and a Flutter mobile application. **Freight and Logistics Platform** Worked for three years on an Angular and .NET freight platform. I developed rate, quotation, search, shipment, booking, reporting, live exchange rate, real-time updates, and air and sea freight integration features. **COBOL Airline System — IBM z/OS** Deployed and fixed a COBOL, CICS, DB2, VSAM, and JCL-based airline system on IBM Cloud, including dataset setup, database configuration, encoding issues, and deployment automation. ## Education B.Sc. in Computer Science and Engineering CGPA: 3.91, Magna Cum Laude American International University-Bangladesh Have a project in mind? Send me the details, and I’ll respond with a clear and practical technical approach.

I bring over 10+ years of expertise in Java, Spring Boot and Cloud technologies. I have consistently delivered robust, scalable, and maintainable software solutions. My passion lies in tackling complex challenges head-on and transforming them into elegant, efficient optimize code. Whether you are looking to build a new application from the ground up, optimize an existing system or solve a specific problem, I bring a wealth of experience and a results driven perspective to ensure your project's success. Let's use Java to make your vision a reality, together. Key Technologies: ✅ Java 8 to 21 ✅ Spring MVC, Spring Boot, Spring Cloud Microservices, Spring Security (JWT, OAuth 2.0) ✅ Hibernate, JPA, JDBC ✅ Restful API, GraphQL ✅ Desktop application: JavaFx ✅ Spring Batch, Scheduler ✅ Frontend: JSP, Thymeleaf ✅ Relational DB: MySQL, PostgreSQL, Oracle ✅ NoSQL DB: MongoDB, Elasticsearch ✅ DB Migration: Liquibase ✅ Asynchronous Messaging: Apache Kafka, RabbitMQ ✅ Build Tool: Apache Maven, Gradle ✅ Version Controller: Git, GitHub ✅ Testing with Junit, Mockito ✅ API Documentation: Swagger UI ✅ Architecture: Monolithic, Microservice ✅ CI/CD Pipeline: Jenkins ✅ Containerization: Docker ✅ Orchestration: Kubernetes ✅ Cloud: AWS, GCP ✅ Monitoring Tools: Log4j, Slf4j, Datadog ✅ Code Quality Tools: SonarQube, Black Duck, Harbor, SecHub Scan ✅ Performance Testing Tool: JMeter ✅ Server: Apache Tomcat ✅ Realtime Scheduler: Quartz ✅ API Integration (Office365, Twilio) ✅ Libraries: Apache POI ✅ Agile Methodologies: Jira, Confluence, Scrum, Sprint Planning, Standup, Retrospectives ✅ Business & Technical Analysis: Requirements Gathering, Risk Analysis, Technical Design, Application Modeling, Implementation Planning and Support Favorite Topics: ⭐ Problem Solving Ability. ⭐ Provide Efficient Optimized Solutions. ⭐ Maintaining Good Quality Code. ⭐ Accepted Challenges That Allows Me to Learn New Skills. ⭐ Test Driven Development. ⭐ Always Prioritize Security Aspects. ⭐ Build automation. Domain Expertise: ✅ Manufacturing ✅ E-Commerce ✅ Education Services ✅ Applicant Tracking System (ATS) ✅ Customer Relationship Management (CRM) Let’s Connect ! 🎉 If you’re looking for a dedicated backend Java developer who can deliver results, I’d love to discuss your project further. Feel free to reach out, and let’s create something amazing together! Thank You

I am a highly experienced Backend Developer with over 5 years of experience in Java/Spring development. I have a strong portfolio, having worked with companies such as Sahmik, Techrivo, Nestle Nespresso, PowerFolder, and SQLI. I have expertise in Java/JEE/Hybris development, and am proficient in HTML 5/CSS 3, JavaScript, ReactJS (basic), Spring Framework, Hibernate, Hybris, Swagger, and Web Services (SOAP, REST). I have a solid understanding of Clean Code, SOLID, GRASP, Effective Java, and Design Patterns principles. I have experience with RDBMS such as Oracle and MySQL and have used tools like Junit, Mockito, IntelliJ, Bitbucket, Git, Maven, Ant, Nexus, Sonar, JIRA, and Jenkins. I am well-versed in Scrum methodology and have experience with Linux, Tomcat, and nginx servers. In addition to my technical skills, I am fluent in Arabic, French, and English, and am a certified Java SE 8 Oracle Certified Associate (OCA). I am dedicated to delivering high-quality, efficient, and well-designed solutions to my clients and am always eager to learn and improve my skills.

Hi there 👋 I am a senior software engineer with more than 18+ years of experience in the industry with a can-do thinking in mind. As a fullstack developer heavy on the backend, I have a wide range of expertise in the backend, frontend, devops, and system design. I am proficient with Java Spring Boot and familiar with Spring Cloud, Spring AI, Spring Data, Micronaut, Hibernate, JUnit, Mockito, AssertJ, K6, Thymeleaf, React, Vue, Angular, Tailwind, Bootstrap, Docker, Kubernetes, Helm, GCP, AWS, Azure and VPS. Using various servers like Postgres, MySQL, Oracle DB, SQL Server, MongoDB, Redis, Elasticsearch, Vespa, Sqlite, BigQuery, Tomcat, Jetty, Undertow, Netty, Nginx, Apache, Node, ActiveMQ, RabbitMQ, Kafka, PubSub, Auth0, Keycloak, LDAP, Eureka, Consul, Vault, Sleuth, Resilience4j, Minio, S3, Alfresco, Jenkins, Stripe, Twilio, OpenAI, Azure AI, Gemini AI, and OpenRouter AI. Using applications like GitHub, GitLab, BitBucket, Jira, Redmine, Trello, Notion, Figma, SSH, TMux, Git, NVim, Copilot, ChatGPT, Gemini, Claude, Codex, VSCode, Cursor, Antigravity, IntelliJ, DBeaver, Insomnia, Postman, and Chrome. The most common projects I work with are API services, web applications, enterprise applications, and AI platform integration using architecture like monolith, modulith, and microservice, using protocols like REST, GraphQL, SOAP, gRPC, JSON-RPC, XML-RPC, WebSocket, Webhooks, Polling, OpenAPI, and AI Platform Integration API with HITL (Human in the loop) good practices. I am open to discussion and project work. Feel free to hire me. Thanks, Warmly Regard.

If your IBM i (AS400) or Mainframe system runs mission‑critical operations, you need modernization without risk I help organizations stabilize, modernize, and integrate legacy IBM i / Mainframe applications while preserving uptime, performance, and business logic. My approach focuses on incremental, low‑risk modernization—extending system life while enabling web, API, cloud, and AI‑driven innovation. With deep hands‑on experience across RPG, COBOL, Mainframe technologies, EDI integrations, and modern web stacks, I provide senior‑level ownership from assessment through production support. What I Bring IBM i / AS400: IBM i (AS400), iSeries, IBM Power Systems (V5R3–V7R5) — system modernization, application migration, performance optimization, and production stability. RPG & ILE: RPG Free, RPGLE, SQLRPGLE, RPG II–IV, CLLE, ILE — legacy refactoring, modularization, DB2 optimization, DDS‑to‑SQL migration. COBOL & Mainframe: COBOL, NetCOBOL, Fujitsu COBOL, CICS, JCL, DB2, VSAM — mainframe modernization, batch migration, performance tuning, controlled legacy transformation. Integration & Modernization: AS400 green‑screen to web (Profound UI, LANSA, SYNON, Rocket Aldon), APIs, EDI (ANSI X12, EDIFACT), ERP & Manhattan WMS integration, ESB, JSON, hybrid/cloud modernization, Angular & React frontends. AI‑Assisted Modernization: AI‑based code analysis, documentation, refactoring, anomaly detection, and batch/workflow automatio Services AS400 & Mainframe Modernization | RPG & COBOL Migration Green Screen to Web Conversion | EDI & API Integration DB2 & Data Migration | Production Support & Maintenance Skills & Technologies Languages: RPG, RPGLE, RPG Free, COBOL, NetCOBOL, JCL, SQL, Python, Java, PHP Databases: DB2/400, IBM Db2, VSAM, PostgreSQL, MS SQL Tools: Profound UI, LANSA, SYNON, Presto, Rocket Aldon, RDz, Eclipse Source Control: Aldon, Turnover, Implementer, Endevor, Git, SVN Platforms: OS/400, IBM i, AS400, IBM Power Systems Infor & JDE Integration: Experience integrating IBM i / AS400 systems with Infor (LN, M3) and JD Edwards (JDE)—supporting data migration, interface development, batch jobs, APIs, and EDI‑driven business workflows. Domains- Banking | Retail | Manufacturing | Insurance | Healthcare | Life Sciences | E‑Commerce | Defense If your IBM i / AS400 or Mainframe environment is critical to revenue, let’s modernize it strategically, with stability and measurable ROI. Click “Hire Me” or send an invite to discuss your project. Keywords IBM i Modernization | AS400 Modernization | RPG Modernization | RPG Free | RPGLE | COBOL Modernization | NetCOBOL | Fujitsu COBOL | Mainframe Modernization | Green Screen Modernization | IBM i Web Enablement | RPG to Java | RPG to .NET | DB2 Migration | ERP Integration | Manhattan WMS | EDI Integration | AI Legacy Modernization | IBM Power Systems | API Integration | Legacy System Transformation |