Hire the Best J2EE Developers

I build mobile apps — the real kind, native, shipped to the store, used by actual people — and lately the AI systems inside them. I've been doing the first for 20 years and the second long enough to know where it actually pays off. I'm Expert-Vetted on Upwork (top 1% of talent), with 100% Job Success, 5,700+ hours, and $200K+ earned. Behind that is 20+ years in software — a decade architecting enterprise systems at Accenture for Fortune 500s, then CTO of a SaaS startup I scaled from 3 to 30+ engineers and took to consumer scale. I'm completing Stanford's AI Professional Program now. What you get is a CTO-caliber technologist who never stopped writing production code. I work two ways, depending on what you need: ⸻ * Mobile Apps — zero to App Store * (fixed-price) You have an idea or a validated concept; I deliver the finished app, live in the App Store and Play Store. Architecture, design, frontend, backend, deployment, and the part most people underestimate — actually getting through store review, native builds, push, Live Activities, the works. I've shipped 20+ mobile apps, several used by hundreds of thousands of people, and I handle the whole build personally. Shipping a native app to a store is a different discipline than deploying a web app, and it's the discipline I've spent years in. * AI Systems and other complex software — design & build * (hourly) Production AI/LLM systems, not prototypes. My recent work is a multi-vendor LLM pipeline that benchmarked 21 model-and-strategy combinations across Claude, GPT, and Gemini over 54 recipe sources in 7 countries — automated quality scoring against an Opus gold-standard reference, and cost tuned across a 150x price spread down to the best quality-per-dollar. The hard part of AI work isn't calling an API; it's knowing where AI actually earns its keep, which model fits which job, and how to architect a pipeline that holds up in production. That's what I do, then I build it — often straight into the mobile products above. ⸻ The background behind that: 10 years at Accenture on large-scale systems for Fortune 500s in healthcare, telecom, oil & gas, and retail. Then CTO at a SaaS startup — engineering scaled 3 to 40, a multi-service platform shipped with payments, identity, and real-time processing running at consumer scale. 📎 Stanford — AI Professional Program (completing August 2026) 📎 Kellogg — Product Strategy 📎 TOGAF Certified Enterprise Architect ⸻ Native Mobile (React Native / Expo, App Store & Play Store delivery) · TypeScript/JavaScript · LLM APIs (Claude, GPT, Gemini) · Prompt Engineering · Multi-Model Pipelines · React · Next.js · Node.js · Supabase · PostgreSQL · AWS · Solution Architecture

Avaialble to work on any kind of project or engagment related to Python, AI/ML and Java. My Expertise- Backend - Python, Java/J2EE Frameworks in Backend - Django, Pandas, FastAPI, Springboot, JavaFX, Microservices. FrontEnd Frameworks - ReactJS, Redux, AngularJS, Angular (2-16), TypeScript, JavaScript. APIs and Integrations- JSON, xml-web-services, Rest/Soap, GPS, Paypal, Chat APIs, Google APIs Application Servers- Tomcat, JBoss, Glassfish, AWS EC2, AWS Lambda, Microsoft Azure, Google Cloud/GCP Database - Oracle, MySQL , PostgreSQL, MongoDB, NoSQL, couchDB CI/CD Tools: Jenkins, GitHub Actions, GitLab CI/CD, CircleCI. Infrastructure as Code: Terraform, CloudFormation, Ansible Containerization: Docker, Kubernetes Monitoring & Logging: Prometheus, Grafana, ELK Stack Tools : GitHub, BitBucket, SVN, Gitlab, JIRA, Postman, Slack, Trello, Asana for project management Payment gateway integration: (Paypal, Stripe, Authorize. net, Securepay, Sagepay) Fintech/Banking : - Mifos X, Mifos, Mifos wallet, Mifos Payment gateway. With nearly 10 years of experience, I specialize in working on existing and complex systems. worked on complex systems in Fintech, Banking, Insurance, Healthcare, Ecommerce, and Logistics — mostly on projects where the codebase already exists, requirements are evolving, and mistakes are costly.

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

Expert in Spring and JEE. Vast experience with many top Java frameworks (Hibernate & EclipseLink, iBatis, Struts 1 & 2, Wicket, RESTEasy & Jersey). Excellent knowledge of HTML & CSS, together with javascript and its popular libraries jQuery, ExtJS. Working smoothly in any team, using version control systems like SVN & Git and tools like Ant & Maven. All backed by fluency in DB layer - writing complex SQL & SPs for MySql, Postgres, SQL Server, DB2. Having a comprehensive knowledge of all layers of a modern web enterprise application, I can supervise the technical aspects of a team of developers, as well as choose and set up optimal set of technologies to meet project needs. At the same time I am able to contribute to developing critical tasks. I have extremely high coding standards. The code that I produce is always clearly written, formatted and documented, using recognized patterns and best practices, optimized for execution and scalability, and consistent across the whole project. Maintainability and ease of serving new requests is extremely important. Proper testing, unit and integration, is mandatory. I also demand this criteria for those who I am supervising. Over the last 13 years I've worked in various companies; developing highly critical applications (in terms of responsiveness, reliability and security) for such clients as banks and European public institutions. I'm capable of working according to a strict specification, but also analyzing loose requirements and making reasonable decisions if given enough responsibility on the project.

Senior Software Engineer having 8+ years of experience with the below skills • 8 years of experience in the design/development of Java/J2EE-based systems and microservice systems. • Strong working knowledge in MVC Architecture and Frameworks – Spring and Spring Boot Framework. • 8+ Years experience in designing and developing Microservices architecture. • 8+ Years experience in Amazon Web Services • 8+ Years experience in Restful web services. • 8+ Years experience in MS-SQL, MONGO, and MYSQL Databases. • Having good working knowledge in Database related Performance engineering activities • 8+ Years experience in Docker Container and Kubernetes. • 8+ Years experience in Kafka Queuing system • Having experience with Designing, Developing, Configuring, and Testing Application environments using Java (Java, Servlets, JSP, JSTL, Java Beans, JDBC, HIBERNATE, Database Mapping, Log4j, HTML).

Your SaaS doesn't need another developer who just writes code—it needs someone who can understand your product, solve backend bottlenecks, and ship reliable features without breaking what's already working. I help startups and growing businesses build, improve, and maintain scalable backend systems and full-stack applications. Whether you're launching a new product or improving an existing one, I can help you: - Build production-ready REST APIs - Add new features to existing applications without introducing regressions - Optimize slow APIs and database queries - Debug complex production issues and eliminate recurring bugs - Integrate third-party APIs, payment gateways, and external services - Design scalable backend architectures for SaaS products - Build secure authentication and authorization systems (JWT/OAuth) - Improve application performance, reliability, and maintainability My primary stack includes Java, Spring Boot, Node.js, TypeScript, React, PostgreSQL, Docker, Redis, AWS, and modern API-driven architectures. I enjoy working with existing codebases, understanding business workflows, and turning ideas into production-ready software that scales. I believe clean architecture, clear communication, and predictable delivery are just as important as writing good code. If you're looking for an engineer who can take ownership, solve difficult backend problems, and build software that lasts, let's talk.