Hire the Best Java Engineers

⭐⭐⭐⭐⭐ Top Rated Plus on Upwork 100% Job Success Score I'm a Java developer with 8+ years delivering production-grade systems from serverless AWS architectures to distributed microservices serving healthcare and fintech clients. 𝗪𝗵𝗮𝘁 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁 ➡ As lead Java developer at my current company, managed a team of 8 engineers over 7 years — delivering 4 production systems across healthcare, fintech, and AI verticals. ➡ Designed serverless AWS infrastructure for a US longevity and healthcare platform as an AWS developer — Lambda, AppSync, DynamoDB, Cognito, SNS/SQS, Stripe, HubSpot currently in production. ➡ Led migration from monolithic Spring apps to distributed microservices — reducing deployment complexity and enabling independent scaling per service. ➡ Built a PDF/UA accessibility compliance platform as backend developer using Java 21, iText 7, PDFBox, veraPDF processing and remediating documents of hundreds of pages against international accessibility standards. ➡ Delivered an AI-powered workflow automation platform as an AI developer integrating Spring AI, Azure cloud, and automated Stripe subscription workflows. ➡ Shipped a medical practitioner dashboard integrating 3rd-party hardware APIs and clinical toolkits as backend developer and tech lead serving real patients and practitioners in production. Core experience as a Java developer and Backend developer As a Java developer with 8+ years in production systems, my core is Java 8 through Java 21 with the full Spring ecosystem Boot, Cloud, Security, WebFlux, Batch, and Spring AI for AI-integrated backends. I work across both relational (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB, Redis) databases, selecting the right store based on access patterns not habit. As a backend developer I've optimised slow MongoDB queries to cut response times, redesigned DynamoDB access patterns for a high-throughput healthcare API, and built Redis caching layers that kept latency flat under load. As an AWS developer, my hands-on stack covers Lambda, AppSync, DynamoDB, Cognito, SQS, SNS, SES, S3, API Gateway, Route 53, and CloudFormation built and maintained in a live US healthcare platform. I design serverless pipelines end-to-end, not just deploy to them. For async workloads I wire event-driven systems using Kafka, RabbitMQ, or AWS SNS/SQS depending on durability and throughput requirements. On the container side: Docker, Kubernetes, Helm, OpenShift, Terraform, and Jenkins full IaC from infrastructure definition to CI/CD pipeline. As an AI developer, I've shipped Spring AI integrations for workflow automation backends, built document intelligence services capable of processing and remediating hundreds-of-pages PDFs against accessibility standards, and connected GraphQL APIs via AWS AppSync for mobile and web AI-driven applications. I also have production experience integrating medical hardware APIs, Stripe subscription billing, and HubSpot CRM sync into Java backends the kind of third-party integration work every backend developer eventually owns in a real product. AWS Developer & 𝗖𝗹𝗼𝘂𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 ✅ Currently operating as AWS developer on a live healthcare platform Lambda, AppSync, DynamoDB, Cognito, SQS/SNS/SES, S3, API Gateway, Route 53, CloudFormation ✅ Experience as AWS developer across serverless, containerized (ECS/K8s), and IaC (Terraform, CloudFormation) environments ✅ Also experienced across Azure (AKS, Azure DevOps) and GCP as multi-cloud backend developer ✅ Kubernetes, Helm, Docker, OpenShift, Jenkins, Terraform the full DevOps chain every AWS developer deploys through AI developer 𝗖𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀 ✅ Delivered AI-powered backend services as AI developer using Spring AI automated content generation and workflow orchestration at scale ✅ AWS AppSync + DynamoDB + Cognito pipeline for a live healthcare platform: the architecture an AI developer builds when latency and data integrity are non-negotiable ✅ Experienced AI developer integrating third-party AI tooling with enterprise Java backends designing event-driven pipelines that handle async AI workloads via Kafka and SQS ✅ As AI developer, built document intelligence features automated PDF tagging, structure remediation, and accessibility validation across large document corpora 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 Healthcare · Fintech · SaaS · E-commerce · Logistics · Telecom · IoT · Blockchain · Automotive · Media 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗥𝗼𝗹𝗲𝘀 ✔ Senior Java Developer · Java Spring Boot Developer · Java Backend Developer ✔ AWS Cloud Engineer · AWS DevOps Engineer ✔ Azure Cloud Engineer · Google Cloud Engineer ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) Need a Java developer, backend developer, AWS developer, or AI developer who ships production systems — not prototypes? Drop me a message. 04/06/2026

🎯 𝗙𝗿𝗮𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝗖𝗧𝗢 & 𝗔𝗜 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁 · 𝟭𝟱+ 𝗬𝗲𝗮𝗿𝘀 · 𝟵,𝟭𝟬𝟬+ 𝗨𝗽𝘄𝗼𝗿𝗸 𝗛𝗼𝘂𝗿𝘀 · 𝟭𝟬𝟬% 𝗝𝗦𝗦. I architect and ship AI products. Java, Python, LLM and RAG systems, AI agents, full-stack, and a senior team that builds 100% of your spec. I am 𝐆𝐮𝐦𝐚𝐧𝐬𝐢𝐧𝐡. For 15+ years I have built software, led delivery, and sat on the buying side of IT services, and today I work as a Fractional CTO and AI Architect for founders who are betting their company on getting the technology right. Here is the deal I make with every client. You stay in the driver's seat. I run the machine. I sit with you through onboarding, turn what is in your head into a written plan and a real architecture, and then a senior engineering team I lead builds it, ten out of ten, against that exact plan. Nothing is called done until it matches what we agreed. I have closed twelve contracts on Upwork this way. Every one is five-star. 100% Job Success. Zero exceptions in over four years. 🔶 𝗪𝗛𝗔𝗧 𝗜 𝗔𝗖𝗧𝗨𝗔𝗟𝗟𝗬 𝗗𝗢 I am most useful when there is real AI in the build and a business riding on it. ✵ AI architecture and engineering : LLM applications on GPT-4o and Claude, retrieval-augmented generation on pgvector, Pinecone, and Qdrant, AI agents and multi-agent orchestration with LangGraph and the Model Context Protocol, evaluation harnesses so you can measure accuracy instead of hoping, and guardrails against prompt injection and hallucination inside a regulated boundary. I have shipped a clinical compliance agent that reads policy and unstructured notes, returns structured answers, and logs every decision for audit. Production AI, with the deterministic validators that keep a model honest. Not a demo. ✵ Java and Python backends : Enterprise Java and Spring Boot for the system of record. Python and FastAPI for the model, data, and orchestration layer. Microservices, event-driven design, REST and gRPC, Postgres, Kafka, Redis, and AWS underneath it all. This is the plumbing that turns an AI prototype into something a real company can run. ✵ Fractional CTO leadership : I plug in as the technology executive your stage cannot yet hire full-time. Architecture decisions, the roadmap, build versus buy, hiring the right engineers, code-quality bars, vendor and agency oversight, and technical due diligence for your next raise. I have done this for Series A and Series B founders and co-presented the technical story in their investor rooms. ✵ Full-stack and ecommerce : where it serves the product. React and Next.js front ends, Ruby on Rails SaaS, Shopify Plus and headless storefronts, Salesforce and CRM integration. I do not lead with this, but when an AI product needs a real interface and a real checkout, my team builds that too. 🔶 𝗛𝗢𝗪 𝗪𝗘 𝗪𝗢𝗥𝗞 𝗧𝗢𝗚𝗘𝗧𝗛𝗘𝗥 You and I own the relationship. I run your onboarding, capture every requirement in writing, set the architecture, and stay your single point of contact start to finish. Behind me is a hand-picked senior team, ten-plus years each on their stack, who write the code under my direction. This is not staff augmentation and it is not an offshore center handed your repo. I am in the code with them, reviewing pull requests and architecture, which is the direction most contractors are missing and the reason you stop paying for rewrites. The promise is simple and I put it in writing on day one. We agree what done looks like before anyone writes a line, against acceptance criteria we can both measure. We build to that list. Everything ships to a staging URL for your sign-off before it counts. You get a written update on the days we work. Nothing is marked complete until it matches the spec, exactly. That is what I mean by ten out of ten on your requirements. 🔶 𝗪𝗛𝗬 𝗙𝗢𝗨𝗡𝗗𝗘𝗥𝗦 𝗧𝗥𝗨𝗦𝗧 𝗠𝗘 "Our client treated him as his own CTO, not an external employee. He built an AI-powered roadmap that reduced manual effort and gave them a real competitive advantage." (Bharat, Founder, Fourfold Tech) "Outstanding professionalism, deep expertise, delivering high-quality results on time." (Healthcare SaaS, 4,409 hrs) "Exceptional knowledge and dedication, consistently delivering results as requested." (Healthcare SaaS, 3,848 hrs) 🔶 𝗕𝗘𝗦𝗧 𝗙𝗜𝗧 AI and SaaS founders who need a Fractional CTO without giving up equity. Teams putting real AI into production under HIPAA, SOC2, or fintech rules. Founders who need an MVP architected right the first time. Operators modernizing a Java or legacy system to clean services on AWS. Engagements from $15K to $500K-plus. Tell me what you have now and what you need next, in a couple of sentences. I will come back with a plan, a timeline, and a milestone or retainer proposal within two hours on business days. 𝐆𝐮𝐦𝐚𝐧𝐬𝐢𝐧𝐡.

Senior Fullstack Software Engineer | Java, Node.js, React | CMS & IoT Expert 🚀 About Me I am a Senior Fullstack Software Engineer with 4+ years of experience in developing high-performance web applications, CMS platforms, and IoT solutions. My expertise spans across Java Spring Boot, Node.js, React, Magnolia CMS, and cloud-based architectures. I have led teams, optimized complex systems, and built scalable solutions for enterprise-level clients. 🔹 Backend: Java Spring Boot, Node.js, NestJS, Microservices, GRPC 🔹 Frontend: React.js, React Native, Headless CMS 🔹 CMS: Magnolia CMS, Liferay, WordPress 🔹 Databases: MySQL, MongoDB, SQL Server 🔹 DevOps & Cloud: Docker, Kubernetes, GitLab CI/CD, AWS 🔹 IoT & AI: Zigbee, MQTT, OpenCV, AI-based detection systems 💼 Notable Projects ✅ MMP’s CMS Website: Built a Java Spring Boot-based CMS optimized for high traffic and large datasets. ✅ Dentsu’s Headless CMS: Developed a scalable API-driven CMS using Magnolia CMS and React. ✅ Yoolife & YooIOC Applications: Smart city applications for residential and operational management. ✅ IoT Platform for Smart Devices: Developed a gateway integrating Zigbee, Z-Wave, and BLE devices with AI-powered event detection. 🔍 Why Work With Me? ✔ Proven expertise in enterprise CMS solutions & IoT systems ✔ Strong problem-solving skills in system architecture & optimization ✔ Experience leading development teams & mentoring junior engineers ✔ Passionate about building scalable, high-performance applications Let’s connect and bring your ideas to life! 🚀

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.

🚀 Expert Web & Mobile Developer | PHP | Java | E-commerce | Cloud | Certified Scrum Master With over 15 years of experience, I am a highly skilled web and mobile application developer specializing in PHP, Java, JavaScript, Python, and cloud technologies. I am passionate about delivering high-quality, scalable, and innovative digital solutions that drive business growth. I have successfully built and deployed hundreds of projects for businesses across industries, including e-commerce, finance, healthcare, real estate, and SaaS. My expertise covers full-stack development, mobile app development, API integrations, cloud solutions, and agile project management. I am a Certified Scrum Master (CSM) with a strong understanding of Agile, SDLC, and DevOps methodologies, ensuring that projects are completed on time, within budget, and with the highest quality standards. 🔹 Key Technical Expertise ✅ Web Development: ✔ Full-Stack Expertise – PHP, Java, JavaScript, Python ✔ Frontend – HTML5, CSS3, JavaScript, jQuery, AJAX, Angular ✔ Backend – Laravel, CodeIgniter, CakePHP, Spring, Django, Flask, FastAPI ✔ CMS Development – WordPress, Joomla, Drupal ✔ API Development – RESTful APIs, GraphQL, SOAP, WebSockets ✔ Payment Gateway Integration – PayPal, Stripe, Razorpay, Authorize.Net ✅ E-commerce Development: ✔ BigCommerce, Shopify, WooCommerce, Magento, OpenCart ✔ Custom Plugin Development & Store Optimization ✔ Shopping Cart & Checkout Customization ✔ Marketplace Integration – Amazon, eBay, Walmart ✔ Subscription & Membership-Based Store Development ✅ Mobile Application Development: ✔ Android & iOS Native App Development ✔ Cross-Platform Apps – React Native, Flutter, Ionic ✔ Backend for Mobile Apps – Firebase, Node.js, PHP, Python, Java ✔ Payment Gateway & Third-Party API Integration ✅ Database Management: ✔ SQL Databases – MySQL, PostgreSQL, MS SQL, Oracle, DB2, MS Access ✔ NoSQL – MongoDB, Firebase Firestore, Cassandra ✔ Data Warehousing & Reporting – Power BI, Azure Data Lake ✅ Cloud & DevOps: ✔ Cloud Services – Azure SQL, Azure Blob Storage, AWS S3, Google Cloud ✔ CI/CD – Jenkins, GitHub Actions, Bitbucket Pipelines ✔ Server Management – Linux, Apache, Nginx, cPanel, WHM ✔ Docker & Kubernetes for Scalable Deployments ✅ Agile & Project Management: ✔ Certified Scrum Master (CSM) – Expert in Agile & Scrum methodologies ✔ Strong knowledge of SDLC, DevOps, and CI/CD workflows ✔ Project Planning, Sprints, & Team Collaboration 📌 Why Choose Me? 🔹 15+ years of hands-on experience in web and mobile development. 🔹 Expert in full-stack development, e-commerce, and cloud computing. 🔹 Proven track record in delivering high-quality projects on time and within budget. 🔹 Strong communication skills in English, Hindi, and Gujarati. 🔹 A results-driven approach with a keen eye for detail, security, and performance. 🔹 Client Satisfaction is My Priority – I focus on building long-term relationships by delivering excellent work and maintaining transparent communication. 📞 Let’s Work Together! If you’re looking for a reliable, experienced, and highly skilled developer, I’m here to help! Whether you need a custom website, a mobile app, an e-commerce store, API integrations, cloud solutions, or agile project management, I have the expertise to bring your vision to life. 💬 Send me a message, and let’s discuss your project today! 🚀

𝗧𝗵𝗲 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿 𝗯𝗲𝗵𝗶𝗻𝗱 $𝟱𝟬𝗠/𝘆𝗲𝗮𝗿 𝗶𝗻 𝘁𝗿𝗮𝗻𝘀𝗮𝗰𝘁𝗶𝗼𝗻𝘀, 𝟱𝟬𝟬𝗞 𝘂𝘀𝗲𝗿𝘀, 𝗮𝗻𝗱 𝗔𝗽𝗽𝗹𝗲-𝗴𝗿𝗮𝗱𝗲 𝘂𝗽𝘁𝗶𝗺𝗲. Senior backend engineer (Java, Spring Boot, Python) with AI built in. 4,100+ hours, $100K+ earned, 100% Job Success, and enterprise delivery for Apple, Fortune 50 food and beverage mncs, Vodafone, and Walmart. 👋 𝐇𝐢, 𝐈'𝐦 𝐆𝐨𝐩𝐚𝐥 𝐒𝐚𝐛𝐡𝐚𝐝𝐢𝐲𝐚. I've spent 13+ years in software engineering, and I've become the engineer teams trust when the backend simply cannot fail. I'm Expert-Vetted on Upwork (top 1%), Top 3% on Toptal, and a former Specialist Programmer at Infosys (their top 1%), where I built for Apple, British Petroleum, Vodafone UK, and Walmart. Right now I'm Tech Lead on a 500,000-user platform at US Pharmacopeia and a sustaining engineer on Fortune 50 food and beverage mnc's GenAI ordering system through Toptal. What that means for you: you're not handing your product to someone learning on your budget. You're getting an engineer who has already shipped the hard version of what you're trying to build. ⚙️ 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 🔹 AI-integrated backends. RAG, LLM and agent workflows, vector search, wired into real Java or Python systems with Spring AI, LangChain, and the OpenAI and Anthropic APIs. Production, not demos. 🔹 Microservices that scale. Java 17/21 and Spring Boot, brittle monoliths broken into services that hold up under load. (Recently: a Java 8 to 25 migration with zero downtime.) 🔹 SaaS and FinTech platforms. Multi-tenant, zero-trust auth, payment and ledger logic that reconciles to the cent, audit trails, and the test pipelines that keep regressions out. 🔹 Full-stack when you need it. FastAPI, Flask, React and Next.js on top, so one engineer owns the whole arc from schema to screen. 📊 𝗪𝗛𝗔𝗧 𝗜'𝗩𝗘 𝗦𝗛𝗜𝗣𝗣𝗘𝗗 (𝗔𝗡𝗗 𝗪𝗛𝗔𝗧 𝗜𝗧 𝗥𝗘𝗧𝗨𝗥𝗡𝗘𝗗) ✓ $50M a year moves through a FinTech ledger I built. 99.99% accuracy, reconciles to the cent. ✓ 500,000 users sign in through a zero-trust auth platform I architected at US Pharmacopeia. ✓ 2,500+ venues run on Bar.Stream, where a human-in-the-loop RAG engine I built replaced manual product classification, and 200+ automations replaced manual data entry. ✓ 100% invoice-parsing accuracy from an AI agent I built for MPI, manual reconciliation gone. ✓ 60% faster APIs and zero-downtime modernization for 50,000+ educators on KigaPortal. ✓ 75% more API throughput on Apple's repair backend. Few engineers can put Apple, Fortune 50 food and beverage mncs, a $50M ledger, and production AI on one page. I can, and I can walk you through the architecture and the numbers behind every one. 🛠️ 𝗦𝗧𝗔𝗖𝗞 Java · Spring Boot / Cloud / Security / AI · Python · FastAPI · Node.js · RAG · LangChain · LLM + vector databases · OpenAI + Anthropic · PostgreSQL · MySQL · MongoDB · Elasticsearch · AWS · GCP · Docker · Kubernetes · CI/CD · microservices · event-driven 🌟 𝗛𝗢𝗪 𝗜 𝗪𝗢𝗥𝗞 You work directly with me. Not an agency, not a rotating team, and not a junior building it while a senior name sits on the invoice. I take your idea from a rough brief to a written spec, then I build it: architecture, code, the hard parts, and the reviews. I've carried year-long builds end to end on my own, so nothing gets lost in a handoff. I keep it efficient. You get working software and a clear weekly update, not a week full of standups. I'm on a call when it actually matters, and when something is at risk you hear it from me early, before it breaks. You set direction, I run the build. 📩 𝗟𝗘𝗧'𝗦 𝗕𝗨𝗜𝗟𝗗 𝗜𝗧 Send me a short note: what you're building and where it's stuck. Within a day you'll get a straight read back, how I'd approach it, the first risk I'd kill, and the one question I'd want answered before we start. If I'm not the right engineer for it, I'll tell you that too.