Hire the Best Gradle Specialists

Senior Java Backend Developer with 10+ years building production systems using Spring Boot, REST APIs, and enterprise databases. CORE EXPERTISE: - Spring Boot, Spring MVC, Spring Data JPA, Spring Security - RESTful API design and development - Database design: MySQL, Oracle - Enterprise system integration - Production support and troubleshooting WHAT I DELIVER: - Spring Boot Enterprise applications and RESTful APIs - Database design and optimization (PostgreSQL, MySQL, Oracle) - System integrations and workflow engines - Application support and troubleshooting RECENT HIGHLIGHTS: - Built configurable workflow engine processing thousands of events - Designed multi-system integrations with comprehensive error handling - Kotlin + Spring Boot experience TECHNICAL SKILLS: Java, Spring Boot, Spring Framework, Kotlin, REST APIs, PostgreSQL, MySQL, AWS, Docker, Git, Agile/Scrum MICROSERVICES KNOWLEDGE: - Strong understanding of microservices architecture patterns through coursework and demo projects. Seeking opportunities to apply this knowledge in production environments and build distributed systems expertise under experienced architects. I have a 5.0 Upwork rating and clients describe me as "professional, responsive, and genuinely committed to delivering high-quality work." Available for long-term contracts (30+ hours/week).

Hi, I'm Lalu Kalsariya, an AI Automation Expert with 10+ years of experience in the IT industry. I help businesses automate their sales, customer support, lead management, and daily operations using WhatsApp Automation, AI Voice Agents, CRM Automation, Lead Automation, n8n, Make, Zapier, OpenAI, and API Integrations. Whether you need an AI WhatsApp Agent, Voice AI Agent, CRM workflow automation, appointment booking, lead follow-up automation, or custom business workflows, I can build scalable solutions that save time, reduce manual work, and improve productivity. I work with a dedicated team of AI automation specialists to deliver secure, reliable, and business-focused automation solutions with long-term support. Let's automate your business with AI.

🚀 I help startups and enterprises build scalable, production-ready software with a strong focus on Java, Spring Boot, and modern backend architecture. As a Software Engineer, I have designed and delivered systems ranging from start-up MVPs to enterprise and government platforms serving thousands of daily users. My expertise is cantered around building clean, maintainable, and high-performance backend applications, while also collaborating across the full software stack whenever projects require it. What I can help you build: ✔ Java & Spring Boot Applications ✔ REST APIs & Backend Services ✔ Microservices Architecture ✔ Authentication & Security (JWT, OAuth2, Keycloak) ✔ Event-Driven Systems (Kafka, RabbitMQ) ✔ Database Design & Optimization ✔ Performance Optimization ✔ System Integration ✔ Cloud-ready Applications ✔ Software Architecture & Code Refactoring Technologies I work with include Java, Spring Boot, Spring Security, Hibernate, PostgreSQL, MySQL, MongoDB, Redis, Kafka, RabbitMQ, Docker, Camunda, Keycloak, AWS, and modern observability tools. Beyond my primary backend expertise, I have also delivered successful projects using Python, FastAPI, Django, React, Next.js, Flutter, and Supabase whenever they were the right technology for the job. 🌟 Highlights • Architected and developed the complete backend microservices platform for "Crewpr", a Dubai-based startup, designing 10+ microservices, integrating multiple third-party services, and building a scalable production system serving thousands of active users. • Contributed to digital transformation projects for Irish government organizations, including Enterprise Ireland, NEH, and Startup Ireland, building secure and scalable backend systems. • Improved the performance and scalability of Yugo, a large-scale European student accommodation platform, by developing backend features and integrating external hospitality systems including RentCafe, Student Suite, and Entrata.

I am a software engineer with 4 years of experience spanning backend development, DevOps, and cloud platform engineering. I build scalable, secure, and automated cloud platforms from the ground up and bring a developer-first mindset to every infrastructure challenge I take on. I work well independently and communicate clearly throughout every engagement, from scoping to delivery. BACKGROUND My career started in software development, building production applications using Spring Boot and Python. This backend foundation shapes how I approach cloud and DevOps work, because I understand what developers need from the platforms they run on. I have hands-on experience with modern AI/LLM tooling including LangChain, LangGraph, and LiteLLM, and I have integrated vector databases like OpenSearch into production systems. This means I can support teams building AI-powered products at both the application and infrastructure layer. WHAT I CAN DO FOR YOU Whether you are a startup building your first cloud environment or an established team dealing with scaling, reliability, or cost problems, I can step in at any stage of the process. * Design and build cloud infrastructure on AWS or GCP from scratch * Migrate existing workloads to the cloud with minimal downtime * Build and maintain backend services and REST APIs using Python or Java * Design relational and non-relational database schemas and optimize query performance * Containerize applications using Docker and orchestrate them with Kubernetes * Build or improve CI/CD pipelines using GitHub Actions or Jenkins * Implement GitOps workflows with ArgoCD for automated, auditable deployments * Write clean, reusable Terraform modules for reproducible infrastructure * Set up full observability with Prometheus, Grafana, and Loki so your team has visibility into everything * Harden your cloud environment for security and compliance * Optimize infrastructure costs without sacrificing performance or reliability * Integrate LLM tooling and AI components into cloud-native architectures CORE SKILLS Backend Engineering * Python, Java, Spring Boot * REST API design and development * PostgreSQL, MySQL, MongoDB, Redis * Message brokers: Kafka, RabbitMQ * Microservices architecture and system design * Authentication and authorization: OAuth2, JWT, Keycloak * Unit testing, integration testing, test-driven development DevOps & Platform Engineering * Kubernetes, Docker, Docker Compose * GitHub Actions, Jenkins, ArgoCD * Terraform, Linux, Bash scripting * Prometheus, Grafana, Loki AI & LLM Engineering * LangChain, LangGraph, LiteLLM * OpenSearch and vector database integration * RAG pipelines and LLM application development Cloud Platforms * AWS: End-to-end architecture, migrations, and optimization * GCP: Production-grade platform design and deployment CERTIFICATIONS Google Cloud * Google Cloud Professional Cloud Architect AWS (13 Certifications) Foundational * AWS Certified Cloud Practitioner * AWS Certified AI Practitioner Associate * AWS Certified Solutions Architect - Associate * AWS Certified Developer - Associate * AWS Certified SysOps Administrator - Associate * AWS Certified Data Engineer - Associate * AWS Certified Machine Learning - Associate Professional * AWS Certified Solutions Architect - Professional * AWS Certified DevOps Engineer - Professional * AWS Certified Generative AI Developer - Professional Specialty * AWS Certified Security - Specialty * AWS Certified Advanced Networking - Specialty * AWS Certified Machine Learning - Specialty HOW I WORK I treat every client engagement like a product. That means understanding the business context behind the technical requirement, communicating progress clearly, delivering clean and documented work, and making sure what I build can be maintained and extended after I am done. I do not disappear after delivery. I make sure things work. I am available for both short-term engagements and longer-term platform work. If you have a specific problem to solve or a platform to build, send me a message and we can determine if I am the right fit.

📢 Available for New Projects 📢 I am a Senior Java Developer and Full Stack Developer with 10+ years of experience building production-grade backend systems, SaaS platforms, and web applications that scale globally. As a Java Developer and Full Stack Developer, I specialize in transforming complex business requirements into reliable, high-performance software solutions. Why hire me as your Java Developer and Full Stack Developer? ⭐ 100% Job Success Score ☕ 10+ years of commercial Java development across enterprise and startup environments 🚀 30+ production systems — SaaS platforms, web apps, APIs, and microservices ⚙️ Expert Java Developer in Spring Boot, Spring Cloud, Hibernate, and microservices 💰 Built fintech Java backend processing $15M+ annually on AWS 📈 Scaled logistics platform to 1.2M+ daily API requests with Redis optimization 🏆 Delivered Full Stack Developer MVP in 6 weeks securing $500K+ pre-seed funding 🖥️ Full Stack Developer — Java backend + React + Node.js + REST API ☁️ AWS, Docker, Kubernetes, CI/CD pipelines 🗄️ PostgreSQL, MySQL, MongoDB ✅ TDD, SOLID principles, clean architecture, Agile 👥 Led 10+ developer teams across full-cycle SaaS delivery What I build as a Java Developer and Full Stack Developer: As a Java Developer, I design backend systems, REST APIs, and microservices that power SaaS platforms, web applications, and enterprise software. As a Full Stack Developer, I cover the complete stack — Java Spring Boot backend, PostgreSQL database, React frontend, and AWS cloud deployment. I have delivered SaaS platforms, CRM systems, ERP solutions, marketplace platforms, booking systems, fintech applications, healthcare platforms, logistics systems, and EdTech products. Industries served: 🏦 Fintech — payment processing, financial SaaS, embedded financing 🏥 Healthcare — HIPAA-compliant platforms, patient management systems 🚚 Logistics — real-time tracking, fleet management, delivery platforms 🛒 E-commerce — marketplace platforms, inventory and order systems 📚 EdTech — learning management systems, educational SaaS platforms 🏗️ Construction — project management, field operations, procurement 📊 SaaS — multi-tenant architecture, subscription billing, dashboards Technical expertise: Backend: Java, Spring Boot, Spring Cloud, Spring Security, Hibernate, Microservices, REST API, Kafka, Redis, OAuth2, JWT Full Stack: React, Next.js, TypeScript, Node.js, NestJS, Redux, Tailwind CSS Cloud: AWS (EC2, S3, RDS, Lambda), Docker, Kubernetes, Jenkins, GitHub Actions, Terraform Databases: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch Integrations: Stripe, Plaid, Firebase, Twilio, QuickBooks, OpenAI API, Claude API What I deliver: ✅ SaaS platform development from MVP to production ✅ Web application development and modernization ✅ REST API design and microservices architecture ✅ Third-party API integrations ✅ Fintech and payment system development ✅ Marketplace and booking platform development ✅ Custom CRM, ERP, and internal tooling ✅ Cloud infrastructure setup and optimization As a Java Developer and Full Stack Developer, I think about architecture, scalability, and maintainability from day one. Whether you need a Java Developer for a critical backend service, a Full Stack Developer to build your SaaS platform, or a technical partner to architect your web application — I deliver production-ready results. Looking for a Java Developer, Full Stack Developer, Spring Boot Developer, SaaS Developer, or Web Application Developer who builds systems that scale? Let's talk 🚀

I am a software engineer with 3 years of professional experience at Oracle, where I contributed to the development and maintenance of large-scale enterprise systems. My background has given me solid expertise in building reliable, maintainable, and high-quality software. In addition to my industry work, I actively contribute to open-source projects such as DevOpsify (a platform that simplifies DevOps project setup) and JavaRIG (a Java Random Instance Generator). These projects reflect my interest in software lifecycle, automation, and developer productivity. Technical Skills: - Backend Development: Java, Spring Boot, REST APIs, microservices, database design - Frontend Development: React, Next.js, modern UI components, responsive layouts - Cloud & DevOps: Docker, Kubernetes, CI/CD pipelines, containerized deployments - Databases: PostgreSQL, MySQL, MongoDB What Clients Can Expect - Clean, maintainable, and well-documented code - Transparent communication and regular updates - Strong problem-solving mindset, focused on delivering practical solutions - A professional background in enterprise software, with the flexibility of a freelancer I am looking to collaborate on projects where I can apply my experience with backend systems, modern web applications, and cloud infrastructure to deliver reliable solutions tailored to your needs.