My name is Saul Hidalgo, a Computer Engineer with a passion for developing Java and .Net software. I have been fortunate to work with exceptional teams and have had the opportunity to contribute to various sectors, including National Security/Defense in the United Kingdom, Oil companies, and Universities such as Harvard Business Publishing. The software I have created is currently being successfully utilized by these organizations. I thrive on new challenges and continuously seek opportunities to expand my skills. You can explore my public contributions on my GitHub account: saulhidalgoaular. Below are my areas of expertise and skills: 1. Code Translation and Conversion: - Proficient in translating code across various languages, with expertise in Python, Java, Delphi, C++, and C#. 2. Document Management System (DMS) - OpenKM: - Extensive experience in developing workflows, automations, cron tasks, and integrations using the Java/PHP API. - Configuration of daily backups. - Skilled in utilizing OpenKM as a DMS. 3. Algorithms and Programming: - Strong command over algorithms and programming skills, particularly in C/C++ and Java. - In-depth knowledge of data structures, strings, sorting, arithmetic and algebra, combinatorics, number theory, backtracking, graph traversal, algorithms for graphs, dynamic programming, and computational geometry. 4. Accounting: - Well-versed in managing material movement between stores and shops. - Proficient in handling retail-related accounting tasks. 5. Point of Sale (POS) Area: - Experience in integrating POS software with label printers, fiscal printers, barcode readers, fingerprint scanners, and keyboards.

**DON'T settle for MESSY code, MISSED deadlines, or developers who disappear. You deserve better.** I know how IMPORTANT your project is—and how frustrating it can be to work with someone who just doesn’t get it. That’s why I’m here. While I’m new to Upwork, I bring over 5 years of real-world experience in full-stack software development. I’ve built everything from cloud-native SaaS platforms to internal enterprise systems, and I care about writing code that’s clean, maintainable, and ready to scale. Here's what I can help you with: 🔧 Robust backends with Java & Spring Boot 🌐 Responsive frontends using Vue.js, React, and Nuxt.js 🖥️ Desktop applications with JavaFX 🛠️ Efficient data structures using PostgreSQL ☁️ Cloud deployments on AWS (EC2, RDS, Lambda, S3) 🚀 CI/CD pipelines and Git-based workflows 🤝 Clear communication, reliability, and fast turnarounds I’m not just here to code—I’m here to solve problems, collaborate, and bring your vision to life. 💼 Attached is my portfolio, where you’ll find real-world projects I’ve built—like a full Procurement and Time Tracking System, among others. These weren’t just exercises—they’re actual systems used in production today. So if you’re looking for a committed, experienced developer who’s ready to earn your trust and deliver real results, let’s connect. I’m ready when you are.

Hi, I’m Priya — a Senior Backend Engineer with 10+ years of experience building scalable backend systems, cloud-native microservices and high-performance APIs using Java and Spring Boot. I help startups and businesses: ✔ Build secure, scalable REST APIs ✔ Design microservices architectures ✔ Improve backend performance & reliability ✔ Migrate legacy systems to modern cloud stacks ✔ Integrate AI-powered features into applications ✔ Agentic AI, RAG pipeline development, Prompt engineering, integrating Claude, Open AI, Openrouter, Ollama I’ve worked with global companies like TCS, Capgemini, and Hilti, contributing to mission-critical enterprise platforms and distributed systems used at scale. 🔹 Core Expertise Java, J2EE, Spring Boot, Spring MVC Microservices (REST, event-driven, Kafka, RabbitMQ) Frontend development on Angular , React, Thymeleaf System design, multithreading, performance optimization AWS (Lambda, EC2, ECS, RDS, API Gateway, S3, CloudWatch) Docker, Kubernetes, CI/CD pipelines SQL & NoSQL databases (Postgres, MySQL, MongoDB, DynamoDB, Supabase) 🤖 AI & Intelligent Systems I also help teams integrate modern AI capabilities into their products: Agentic AI workflows RAG (Retrieval-Augmented Generation) APIs, Configured Light RAG for uploading kowledgebase, business data and based on that AI will respond to user queries and trigger workflow. OpenAI / GPT / Claude / Gemini integrations Vector databases (pgvector, Pinecone) AI microservices & knowledge-base systems Implemented MCP servers and deployed on Railway. Configured Agent in Claud and TypingCloud. What clients like about working with me: Clear communication Strong architecture thinking Clean, maintainable code On-time delivery Long-term reliability If you’re looking for a senior backend engineer who can both build strong systems and think strategically about architecture, I’d be happy to discuss your project.

I specialize in building and optimizing high-performance web applications with a strong focus on backend architecture and modern frontend development. My work is centered around delivering reliable, scalable solutions that handle real-world business needs. With solid experience across Java, PHP, Python, and JavaScript ecosystems, I develop robust APIs, microservices, and full-stack applications. On the frontend, I build fast and responsive interfaces using React and Next.js, ensuring smooth user experiences and maintainable codebases. ✅ What I can do for you: - Develop scalable backend systems (Java Spring, Laravel, Django, FastAPI) - Build modern web apps with React / Next.js - Design and integrate REST & GraphQL APIs - Optimize databases (PostgreSQL, MySQL, MongoDB) - Implement real-time features (WebSockets) - Integrate third-party services (payments, AI, analytics) - Improve performance, scalability, and security 💼 If you need a reliable developer who can handle both backend complexity and frontend delivery let’s connect. 🔑 KEYWORDS: Full Stack Developer, Backend Developer, Java Developer, Spring Boot, PHP Developer, Laravel Developer, Python Developer, Django, FastAPI, Node.js, NestJS, React Developer, Next.js Developer, TypeScript, JavaScript, REST API, GraphQL, Microservices, WebSockets, PostgreSQL, MySQL, MongoDB, Redis, Kafka, RabbitMQ, Docker, AWS, CI/CD, API Integration, Performance Optimization, Scalable Systems, SaaS Development

Most developers can build an API. I build APIs that your team won't hate maintaining six months from now. With a background in the financial sector and legal tech, I’ve learned that sloppy code costs money. My approach is simple: build it robust, document it well, and automate everything that can be automated. Why work with me? I embrace AI, I don't hide it: I use modern AI tools to accelerate the development cycle by rapidly prototyping, generating test cases, and refactoring legacy code. You get the quality of a senior engineer with the speed of a full team. Full-Cycle Ownership: From the initial architectural diagram to the Docker container running in Kubernetes, I own the process. Communication: I speak "Engineer" and I speak "Business." I ensure technical decisions align with your product goals. Technical Toolkit: Backend: Java, Spring Framework, Golang, SQL DevOps: Docker, Kubernetes, Jenkins, GitLab CI/CD Frontend: ReactJS, Angular Quality: Mockito, JUnit

✅ 10+ Years of 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 Java Development Experience ⚡ Full-Cycle Development & 𝐀𝐈-𝐄𝐧𝐡𝐚𝐧𝐜𝐞𝐝 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠 ⚡ Experience Building 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬, 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬, 𝐚𝐧𝐝 𝐋𝐋𝐌-𝐄𝐧𝐡𝐚𝐧𝐜𝐞𝐝 𝐀𝐩𝐩𝐬 👀 Click Hire or Invite a Senior Java Developer & Software Architect Looking for a Java Developer who can build not just software, but scalable products designed for thousands of users and long-term business growth? For 10+ years, we've helped startups, SaaS companies, fintech organizations, and enterprise businesses transform ideas into production-ready systems. From Java Backend platforms to Full Stack Java applications and 𝐀𝐈-powered products, we deliver software built to scale. 👉 WHAT YOU GET ✔️ Senior Java Developer expertise backed by 10+ years of experience and 2,000+ successfully completed projects. ✔️ Java Backend Developer capabilities spanning architecture, development, deployment, optimization, and long-term support. ✔️ Full Stack Java Developer experience delivering end-to-end products using Java, React JavaScript, Angular, and modern frontend technologies. ✔️ Java Architect guidance focused on maintainability, scalability, and measurable business outcomes. 🏆 ACHIEVEMENTS ✔️ 10+ years building Java EE applications, enterprise systems, SaaS platforms, and fintech products. ✔️ 2,000+ successful engagements supporting startups and enterprise organizations. ✔️ 100,000+ end users served through scalable backend infrastructures and business-critical applications. ✔️ Up to 40% faster delivery enabled through AI-enhanced development workflows and automation. ✔️ Up to 50% performance improvements achieved through backend optimization, caching, and architecture modernization. ✔️ Multi-year partnerships supporting product evolution and continuous innovation. 🚀 WHERE I DELIVER ✔️ As a Java Developer with 5 years of experience and Senior Java Developer, I build Java Backend solutions using Java, Spring Boot, Java Spring Boot, Spring Framework, Spring Data, Spring Security, Hibernate, and JPA. ✔️ As a Java Architect 5+ years, I design scalable Software Architecture using DDD, SOLID, GRASP, Enterprise Patterns, TDD, and Agile methodologies. ✔️ As a Full Stack Java Developer 6+ years, I combine Java React, React JavaScript, JavaScript Developer expertise, HTML, CSS, TypeScript, Angular, and React to deliver complete products. ✔️ As a Python Developer and Web Developer 5+ years, collaborator, I support cross-functional teams building integrated enterprise ecosystems. ✔️ As an Android Java specialist, I contribute to Android Java initiatives and mobile backend integrations when required. ⚙️ CORE JAVA ECOSYSTEM ✔️ 10+ years of expertise with Spring Boot, Java EE, Hibernate, JPA, Maven, Gradle, JUnit, Git, and CI/CD pipelines. ✔️ 8+ years working with PostgreSQL, MySQL, MariaDB, MongoDB, Redis, Memcached, and scalable database architectures. ✔️ 7+ years implementing RabbitMQ, Kafka, ActiveMQ, asynchronous messaging, and event-driven systems. ✔️ 5+ years building modern frontend experiences using React JavaScript, Angular, JavaScript, and TypeScript. ✔️ Experience with JavaFX, Kotlin, Groovy, Grails, and Java Kotlin Developer initiatives across diverse business domains. ✔️ Strong AWS expertise delivering cloud-native Java AWS deployments and secure infrastructure solutions. 🤖 AI-ENHANCED ENGINEERING ✔️ 5+ years leveraging AI-assisted development to accelerate delivery by up to 40%. ✔️ 3+ years AI-native workflows improving prototyping, debugging, testing, and code quality. ✔️ Prompt engineering, agentic coding systems, and human-in-the-loop AI practices enhancing productivity. ✔️ OpenAI integrations, AI automation, and intelligent workflows supporting next-generation products. 🏢 INDUSTRY IMPACT ✔️ Nationwide caregiving platforms connecting thousands of users and providers. ✔️ Online banking and fintech systems supporting secure transactions and regulatory requirements. ✔️ Precious metals trading solutions optimized for performance and reliability. ✔️ Hospitality platforms improving operational efficiency and customer experiences. ✔️ Workflow automation engines reducing manual effort and increasing productivity. ✔️ Contributions to Apache Fineract initiatives supporting financial technology innovation. 🚀 WHY CLIENTS CHOOSE US ✔️ 10+ years of Java and Full Stack expertise.✔️ 2,000+ successfully completed Upwork projects.✔️ Experience serving clients across 20+ countries. ✔️ Full-cycle delivery from concept to deployment.✔️ Production-ready code built for scale and maintainability. ✔️ Transparent communication and long-term partnership mindset. Looking for a Java Developer, Java Backend Developer, Senior Java Developer, Full Stack Java Developer, Java Architect, Java AWS expert, JavaScript Developer, Python Developer, or a trusted engineering partner who can modernize legacy systems, build enterprise products, and integrate AI capabilities.

Top Rated Plus QA Automation Engineer (3,000+ Upwork hours, 100% Job Success). I help teams ship faster by building reliable UI + API test coverage that catches regressions early and produces clear, actionable reports. What I can do for you: • UI Automation: Playwright (E2E/regression suites), Selenium (Java) • API Testing: Postman, REST Assured (automation + validations) • Manual QA: exploratory testing, regression testing, test case design • Performance: JMeter smoke/load testing (when needed) What you get (deliverables): • Clean bug reports with repro steps + evidence • Maintainable automation (Page Object Model, stable selectors, reusable helpers) • CI-ready execution + reporting (if you already have CI, I plug in cleanly) • A test plan that matches your release flow (not generic “checkbox QA”) If you need someone who can quickly understand your product and start producing signal (not noise), I’m a solid fit.

Are you looking to build a high-performance software application from scratch? Or do you need a seasoned technical leader who can effortlessly bridge the gap between complex backend architecture and a highly responsive, visual frontend? With over 13 years of enterprise-level experience, I specialize in taking web systems from a blank canvas all the way to a polished, production-ready end product. Technologies & Frameworks Working Experience (Backend + Front-End) Java Spring Boot Micro-Services REST API MySQL DynamoDB MongoDB Angular 4 Tailwind CSS Svelte 5 + SvelteKit D3.js Fabric.js Dynamic SVG Rendering AWS Cloud Infrastructure (EC2 , ECS , Cloudwatch , Cloudformation , S3 , Lambda , Amplify , Route53 , VPC , Load Balancing , ASGs) Git (Code Managment) Development of Data-Rich Interfaces Whether you are launching a new platform from the ground up or modernizing an existing legacy ecosystem, I bring the technical depth, execution speed, and architectural oversight needed to ensure success.

A 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐟𝐮𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐢𝐭𝐡 𝐚 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 building Java Spring Boot backends, modern web apps, n8n automations, and WordPress solutions that are robust, scalable, and delivered on time. I work at the intersection of enterprise backend engineering, full stack product development, AI-powered workflow automation, and WordPress helping startups launch MVPs quickly and helping businesses eliminate the manual work that slows their teams down. 🚀 What I'm Best At: 🔹𝐉𝐚𝐯𝐚 & 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 (𝐜𝐨𝐫𝐞 𝐞𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞): ☕ 𝐉𝐚𝐯𝐚 𝐄𝐜𝐨𝐬𝐲𝐬𝐭𝐞𝐦: Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Spring Cloud, Hibernate, Kotlin 🖥️ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: Next.js, React, TypeScript, Angular, Tailwind CSS 💻 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js (Express, NestJS), Python (FastAPI, Django) 💾 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: PostgreSQL, MySQL, MongoDB, Redis ☁️𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐥𝐨𝐮𝐝: AWS (EC2, S3, RDS, CloudFront, Lambda), Docker, Kubernetes, GitHub Actions, Jenkins 🔹 n8n Automation & AI Workflows: 🧠 Workflow Automation: n8n, Zapier, Make connecting your tools and cutting out repetitive manual work entirely 🤖 AI Integration: OpenAI, Claude, Gemini embedded intelligently into your products and business processes 📣 CRM & Lead Automation: email pipelines, WhatsApp, Slack, webhook-driven workflows, outreach systems 📦 Custom Automations: data sync, onboarding flows, report generation, notification systems, document processing 📦Health Care system taking care of HIPPA Compliance practices and PHI 🔹 WordPress & WooCommerce: ⚡ Custom themes and plugins built from scratch no bloated templates 🛒 WooCommerce: payments, subscriptions, multi-vendor marketplaces 🔐 Performance optimization, security hardening, malware cleanup, and full site migrations 🧩 Page builders: Elementor Pro, Divi, Bricks, WPBakery, Gutenberg 🔹 Why Work With Me: › Top Rated with 100% Job Success consistent results across every engagement › I take full ownership of outcomes not just tasks and keep you informed at every step › Clean, well-documented code your team can maintain without needing me forever › AI-powered development workflow: I ship faster without sacrificing quality or cutting corners › Clear, proactive communication you'll never be left guessing about progress ⭐ What clients say: "Hamdan demonstrated strong expertise in Java Spring Boot and Next.js clean, efficient code that met all requirements." Marketplace Platform (681 hrs · $2,241) "Completed the AWS deployment exactly as promised. Highly recommend for CI/CD and AWS configuration." Spring Boot + AWS DevOps "Very understanding and always available. He makes sure everything is clear before moving forward." n8n CRM Automation "Delivered exactly what was needed with minimal instructions. Sincere, hard-working — I would highly recommend." NestJS / Angular + DevOps 🤝 Let's Talk — you might be a great fit if you need: - A Java Spring Boot API or full stack web application built properly from day one - An n8n automation workflow that saves your team hours every single week - A marketplace, SaaS MVP, or internal tool launched in weeks not months - A fast, secure, and conversion-ready WordPress or WooCommerce site - A reliable developer who communicates clearly, delivers consistently, and cares about your success Click "Invite to Job" or send me a message I'd love to hear about your project. 🚀

I am a seasoned IT professional with over 8 years of experience designing, developing, and managing scalable technology solutions across multiple domains, including marketplaces, energy analytics, healthcare, and cybersecurity. I specialize in Java, Python, AWS, and modern web technologies, delivering robust applications and cloud-based systems that drive business efficiency and performance. As a Senior Technical Lead, I have successfully led multiple systems, including: Marketplace Platforms: Built scalable, high-performance systems for online booking and aggregation, managing multiple microservices, cloud deployments, and optimized service-to-service communication. Analytics & Data Platforms: Designed and implemented back-end APIs for real-time analytics in the energy and utilities sector, ensuring high performance, security, and data accuracy. Healthcare Systems: Developed secure platforms for managing and analyzing sensitive health data, leveraging microservices, AWS cloud, and database optimization strategies. Cybersecurity & Threat Analytics: Contributed to building secure, cloud-based solutions for threat detection and incident response, focusing on reliability and scalability. I bring deep expertise in cloud solutions (AWS), microservices architecture, database optimization (MySQL, MongoDB, DynamoDB), caching strategies (Redis), and scalable backend systems. I also guide technical decisions, ensure code quality, and mentor teams to deliver maintainable, secure, and high-performing systems.