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I am an experienced Software Engineer specializing in Java, Spring Boot, J2EE, and Microservices Architecture, with strong expertise in enterprise-level FinTech applications. Since November 2022, I have contributed to mission-critical projects at Atlas Computer Technology, including USSD platforms, Mobile Banking, Backoffice systems, and real-time payment integrations. My expertise includes: ✅ Java EE & Spring Boot (Reactive) for building scalable, high-performance banking applications, including customer onboarding and back-office operations. ✅ Microservices design and implementation with modular, maintainable architectures. ✅ Asynchronous messaging & integration using Kafka and ActiveMQ for seamless inter-service communication. ✅ Payment gateway integrations, including Flygate and IPS, supporting real-time bank-to-bank transfers with XML messaging. ✅ Secure identity management using Keycloak. ✅ Designing and consuming RESTful APIs, with experience in modernizing services for cloud readiness and enterprise integration. Professional Approach: I am passionate about delivering clean, maintainable, and production-ready code that drives real business value. I bring a problem-solving mindset, collaborative approach, and adaptability to every project — whether building features from scratch, optimizing existing systems, or integrating complex banking solutions. Let’s connect and make your vision a reality. Portfolio: kidist-portfolio-al3e.vercel.app

With 12+ 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

Engineer 7+ years with AI mind set delivering growing and long-term products for clients across the US, Israel, Japan... across domains like eCommerce, Fintech systems, adTech platforms, and enterprise web integrations. • Enterprise Systems: Role-based, Tenant-based systerm, Authentication follow, Design system,.. • eCommerce: Product catalogs, checkout + order flows, inventory sync,... • AdTech: Campaign builders, analytics dashboards, API integrations,... • Web Integration: Payment integration, Twilio, Firebase, Google APIs, legacy system migration,.. BACKEND: Java 11–25 · Spring Boot 2 & 3 & 4 · Kotlin · TypeScript · NestJS · Quarkus · Microservices · REST API · Firebase FRONTEND React.js · Angular · Vue.js · TypeScript · JavaScript · HTMX AI FIRST NATIVE Claude · Codex · windsurf DATABASE & MIGRATIONS PostgreSQL · MySQL · MongoDB · Liquibase · Flyway SECURITY & DEVOPS OAuth2 · Keycloak · SonarQube · Docker · GitHub Actions · CI/CD THIRD-PARTY INTEGRATIONS Stripe · PayPal · Myfatoorah · Twilio · Telnyx · Google APIs · Firebase API · Algolia Search · reCAPTCHA 100% Job Success Long-term client relationships End-to-end ownership from dev → test → deploy. Let's discuss your project.

Senior Backend Engineer with 10+ years of experience designing and building scalable backend platforms and cloud-based distributed systems. Strong expertise in Java, Spring Boot, and microservices architecture with production deployments on AWS. Experienced in building high-availability APIs, event-driven systems, and real-time services. Proven ability to improve system performance, reliability, and security while collaborating with global engineering teams. TECHNICAL SKILLS Languages: Java (8–17), JavaScript Backend: Spring Boot, Spring MVC, JPA, Hibernate, Google Guice, REST APIs, Microservices, WebSocket Frontend: AngularJS, Angular, React Messaging: Kafka, RabbitMQ Cloud & Infrastructure: AWS (EC2, S3, SQS, SNS, Lambda, Cognito, SES), Docker Databases: PostgreSQL, MySQL Observability: Elasticsearch, Logstash, Kibana (ELK) Security: OAuth2, JWT, Keycloak, OWASP Top 10 DevOps: Jenkins, Azure DevOps, Git, Bitbucket

🚀 I build scalable backend systems and full-stack applications for SaaS platforms, startups, and enterprises — with 5+ years shipping production Java / Spring Boot systems, and hands-on MERN stack experience when projects call for a JavaScript-based full-stack build. I currently work as a Senior Software Engineer on Xcelerate, a microservices-based SaaS platform for restoration companies, where I develop and maintain 20+ Spring Boot microservices, build real-time messaging systems, and integrate third-party platforms like QuickBooks, RingCentral, Zapier, and Encircle. What I can help you build: ✔ Java & Spring Boot backend systems ✔ Microservices architecture & REST APIs ✔ MERN stack applications (MongoDB, Express, React, Node.js) ✔ Third-party integrations (QuickBooks, Stripe, Twilio, Zapier, RingCentral) ✔ Cloud deployments — AWS, Azure, GCP ✔ CI/CD pipelines (Jenkins, GitHub Actions), Docker ✔ Database design & query optimization (PostgreSQL, MySQL, MongoDB) ✔ Legacy system modernization (Java 8 → Java 21 migrations) Highlights: Led backend development across 20+ microservices for Xcelerate, a live SaaS platform for restoration companies Migrated infrastructure from VMs to Azure App Services, implementing Azure Front Door for traffic routing and load balancing Built WS Glam, a full-stack e-commerce platform from scratch — frontend, backend, admin panel, payment integration, and role-based access control Integrated Stripe subscription billing for Remojo and overhauled its backend architecture for scale Built a custom AML (Anti-Money Laundering) system from scratch, including case management tools and fraud detection workflows I think in terms of failure modes before I write code — what happens when a webhook fires twice, when an API rate-limits mid-sync, when a migration needs to run without downtime. I communicate proactively and hand off production-ready code with documentation to match. Let's talk about what you're building — I'll give you a straight technical assessment and a clear path forward.

AI Engineer and Solutions Architect with 10+ years of experience building scalable SaaS platforms, enterprise systems, and cloud-native applications. Over the past two years, I have been helping businesses integrate Generative AI, Large Language Models (LLMs), AI Agents, Retrieval-Augmented Generation (RAG), and workflow automation into production systems. I specialize in OpenAI, Claude, GPT-4, LangChain, LlamaIndex, Vector Databases, AI Chatbots, AI Search Systems, and enterprise-grade backend architecture using Python, Java, Spring Boot, AWS, PostgreSQL, MongoDB, Docker, and Kubernetes. I help companies move beyond AI demos and build production-ready AI products that scale securely and reliably. Over the last 10+ years, I’ve architected and scaled SaaS platforms, enterprise systems, and cloud-native applications used by startups and growing businesses across healthcare, fintech, logistics, travel, AI, and real estate industries. I specialize in Java, Spring Boot, Microservices, AWS, PostgreSQL, MongoDB, Kubernetes, and scalable backend architecture for high-performance SaaS platforms. Worked on platforms handling real-time workflows, payment systems, enterprise reporting, AI integrations, booking engines, analytics systems, and multi-tenant SaaS infrastructure. I’ve developed enterprise-grade platforms for healthcare, fintech, e-commerce, and real-time applications, focusing on scalability, security, and long-term maintainability. My expertise includes: ✔ High-performance REST APIs ✔ Microservices architecture ✔ Cloud-native AWS deployments ✔ Authentication & payment systems ✔ Enterprise integrations ✔ Performance optimization Whether you need to modernize a legacy Java application, build a backend from scratch, or scale an existing SaaS platform, I can help architect and deliver reliable production-ready systems. My Core Competencies 1. Java Development: - Core Java: In-depth knowledge of Java’s features, collections, concurrency, and multi-threading - Spring Framework: Expertise in Spring Boot, Spring MVC, Spring Security - Microservices: Designing and implementing microservices architecture with Spring Cloud - API Development: RESTful APIs with JWT, OAuth, and GraphQL integration 2. Mobile App Development: - Android Development: Skilled in developing native Android apps using Java and Kotlin - App Lifecycle: From UI/UX design to API integration and deployment 3. Database & Back-End: - Database Expertise: Proficient in MySQL, PostgreSQL, and MongoDB for secure, scalable data management - ORM: Working with Hibernate for object-relational mapping - Server-Side Scripting: Building efficient backends with Java and Spring. 4. Deployment & Cloud: - Cloud Deployment: Expertise in deploying Java-based applications on AWS, Azure, and Google Cloud - Containerization: Proficient with Docker for application containerization and management 5. Security & Performance: - Application Security: Implementing secure systems with Spring Security, OAuth, and data encryption - Performance Tuning: Optimizing application speed, database queries, and server-side performance AI & Generative AI Expertise ✔ AI Chatbot Development ✔ OpenAI API Integration ✔ Claude AI Integration ✔ GPT-4 Applications ✔ AI Agents & Agentic Workflows ✔ Multi-Agent Systems ✔ Retrieval-Augmented Generation (RAG) ✔ AI Knowledge Bases ✔ Enterprise Search Systems ✔ Semantic Search ✔ Embedding Models ✔ Vector Databases ✔ Document AI ✔ AI Workflow Automation ✔ Conversational AI Platforms ✔ AI SaaS Products ✔ LLM Evaluation & Optimization ✔ Prompt Engineering ✔ AI API Development ✔ AI Automation for Business Processes Industries I Serve - E-Commerce: Custom checkout systems, payment gateway integration, and scalable shopping carts - Healthcare: HIPAA-compliant mobile apps and backend systems for patient management - Finance: Developing secure and efficient transaction systems, real-time data processing - Education: Learning platforms and mobile apps to enhance educational experiences - Travel & Hospitality: Building booking engines, itinerary planners, and travel apps - Real Estate: Custom property listings, user-friendly property search apps What I Can Help You Build - SaaS backends - REST APIs - Microservices architecture - Authentication systems - Payment integrations - Cloud deployment pipelines - Enterprise dashboards If you need a reliable backend engineer to build scalable APIs, SaaS platforms, or cloud-native Java applications, let’s discuss your project. Keywords: Spring Boot, Java Backend, SaaS Development, REST API, Microservices, AWS, Scalable Applications, SaaS Architecture, Platform Engineering, Distributed Systems, Event-Driven Architecture, Cloud-Native Development, Enterprise APIs, Multi-Tenant SaaS, AI Integrations, Kubernetes, Docker, Kafka, DevOps, System Design, Scalable Infrastructure, High Availability Systems, Fintech, Healthcare Platforms, Booking Engines, Real-Time Systems