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As a Director of Technology, Leonardo combines deep technical expertise with strategic leadership. He excels at building resilient backends, driving architecture decisions, and aligning technology with business goals. Leonardo is a Senior Java Developer and AWS Certified Solutions Architect with 15+ years of experience designing cloud-native systems and leading cross-functional teams. He has delivered scalable, mission-critical platforms for high-growth startups and enterprises across Latin America. 🔹 Java, Spring Boot, REST APIs, Hibernate, Maven, Gradle 🔹 AWS (EC2, S3, Lambda, Route 53, CloudFront, IAM, CloudWatch, ECS, ECR, Load Balancers) 🔹 Microservices, RabbitMQ, asynchronous/event-driven architecture 🔹 MySQL, PostgreSQL, SQL optimization, Redis, Liquibase 🔹 CI/CD pipelines, Docker, Git, Bash scripting, Linux administration 🔹 Reporting & analytics: Tableau, Power BI, MyDBR, complex SQL views 🔹 Team leadership, agile delivery, digital transformation, mentoring tech teams

📢 Available for New Projects 📢 Hi, I'm 𝗔𝘃𝗻𝗲𝗲𝘁, a Senior Java Developer and Technical Lead with 𝟭𝟰+ years of experience building enterprise software for 𝗙𝗼𝗿𝘁𝘂𝗻𝗲 𝟱𝟬𝟬 companies across 𝗳𝗶𝗻𝘁𝗲𝗰𝗵, 𝗵𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲, 𝘁𝗲𝗹𝗲𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀, 𝗮𝗻𝗱 𝘁𝗮𝘅 𝘁𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝘆. I specialize in designing scalable backend systems with Java and Spring Boot while also delivering modern full-stack applications using React and Angular. I currently work on Canada's online tax platform at 𝗛&𝗥 𝗕𝗹𝗼𝗰𝗸 𝗖𝗮𝗻𝗮𝗱𝗮, where I design and develop cloud-native applications, microservices, secure APIs, authentication systems, and production-grade integrations used by thousands of users. I enjoy solving complex engineering problems, improving application performance, and building software that's easy to maintain and scale. I communicate clearly, take ownership of projects, and focus on writing clean, production-ready code rather than quick fixes. Whether you're launching a new product or improving an existing platform, I can help you deliver reliable software faster. ### 𝗪𝗛𝗔𝗧 𝗜 𝗛𝗘𝗟𝗣 𝗪𝗜𝗧𝗛 ✔️ Enterprise Java Applications (Spring Boot, Microservices, REST APIs) ✔️ Full-Stack Development (React, Angular, TypeScript) ✔️ Legacy Application Modernization & Performance Optimization ✔️ Cloud-Native Development (Azure, AWS, Docker, Kubernetes) ✔️ Authentication & Security (OAuth2, JWT, Auth0) ✔️ Third-Party Integrations, Payment Systems & Enterprise APIs ✔️ System Design, Solution Architecture & Technical Leadership ✔️ AI-assisted Software Development using GitHub Copilot and ChatGPT Clients appreciate my ability to understand complex business requirements quickly, communicate proactively, and deliver maintainable solutions that continue performing long after deployment. ### 𝗦𝗣𝗘𝗖𝗜𝗔𝗟𝗧𝗜𝗘𝗦 Java, Spring Boot, Microservices, REST APIs, React, Angular, TypeScript, PostgreSQL, Docker, Kubernetes, Azure, AWS, OAuth2, JWT, Auth0, System Design, Enterprise Architecture, Cloud Development, Full-Stack Development, AI-assisted Software Development. ### 𝗠𝗬 𝗦𝗧𝗔𝗖𝗞 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Java, Spring Boot, Spring Security, Hibernate, REST APIs, Microservices 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: React, Angular, TypeScript, JavaScript 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀: Microsoft Azure, AWS, Docker, Kubernetes, Azure DevOps 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: PostgreSQL, MySQL, SQL Server 𝗧𝗼𝗼𝗹𝘀 & 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀: Auth0, Stripe, Azure Service Bus, Git, CI/CD ###💡𝗪𝗛𝗬 𝗛𝗜𝗥𝗘 𝗠𝗘 (𝗪𝗛𝗔𝗧 𝗪𝗜𝗟𝗟 𝗬𝗢𝗨 𝗚𝗘𝗧?) ✅ Faster time-to-market → I deliver production-ready APIs, admin panels and integrations so you can start generating value sooner. ✅ Less risk, more reliability → solid architecture, clean code, and production-hardened practices. ✅ Real business integrations → payments, digital signing (Digio), PDF workflows (iText), analytics & notifications. ✅ Maintainable systems → I write code your team can extend, not hacky quick fixes you’ll regret. ✅ Focus on ROI → features prioritized by impact, so every sprint moves business metrics. ### 𝗥𝗘𝗔𝗗𝗬 𝗧𝗢 𝗕𝗨𝗜𝗟𝗗? Whether you need a senior engineer to architect a new platform, modernize an existing application, or solve difficult production issues, I'd be happy to help. Let's discuss your project and build software that's scalable, secure, and built to last.

Hello! I’m Senior developer with over 10 years of professional experience building enterprise-grade applications, RESTful microservices, and cloud-native solutions. I have successfully delivered projects for clients across Europe, the UK, Australia, India, South Africa, and the USA. ✅ Languages: Java, Kotlin, C#, Groovy, Python, Node.js, Rails, TypeScript ✅ Back-End: Spring Boot, Spring Cloud, Spring Security, Micronaut, Camel, Express.js, NestJs ✅ Front-End: Angular, Vue.js, Nuxt, HTMX, Django, Tailwind CSS, Bootstrap ✅ Databases: PostgreSQL, MySQL, Oracle, MongoDB, Redis, Neo4J, DynamoDB ✅ Cloud & DevOps: AWS, CDK, Cloudformation, ECS, API Gateway, Lambda, Cognito, DynamoDB, Azure, Docker, Kubernetes, Terraform, Jenkins, GitHub Actions, Cloudflare ✅ Architecture: Clean Architecture, Hexagonal, Domain-Driven Design DDD, Microservices, Monolith ✅ Messaging: Kafka, RabbitMQ, ActiveMQ, Artemis ✅ Monitoring: Grafana, Kibana, Datadog ✅ APIs: REST, SOAP, gRPC, GraphQL, Websocket, SSE, tPRC ✅ Build & Tooling: Maven, Gradle, Flyway, Liquibase ✅ Ai: Agentic Ai, Harness, Hermes Agent, SDD, TMUX, RAG, GraphRAG, Voice Ai Agent, Elevenlabs ✅ Opensource contribution to popular opensource projects like FlowiseAi, AWS PDK, Mongock, Jhipster lite and Jhipster Main generator. You can confidently entrust me with your project and you will not be let down by our collaboration. I assure you of my strong sense of responsibility and the high standard of the work I deliver, which you can rely on once I become part of your team.

🚀 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.

— TOP RATED PLUS Freelancer on UPWORK — EXPERT VETTED Freelancer (Among the Top 1% of Upwork Freelancers) — Full Stack Engineer — Data Engineer ✅ AWS Infrastructure, DevOps, AWS Architect, AWS Services (EC2, ECS, Fargate, S3, Lambda, DynamoDB, RDS, Elastic Beanstalk, AWS CDK, AWS Cloudformation etc.), Serverless application development, AWS Glue, AWS EMR Frontend Development: ✅ HTML, CSS, Bootstrap, Javascript, React, Angular Backend Development: ✅ JAVA, Spring Boot, Hibernate, JPA, Microservices, Express.js, Node.js Content Management: ✅ Wordpress, WIX, Squarespace Big Data: ✅ Apache Spark, ETL, Big data, MapReduce, Scala, HDFS, Hive, Apache NiFi Database: ✅ MySQL, Oracle, SQL Server, DynamoDB Build/Deploy: ✅ Maven, Gradle, Git, SVN, Jenkins, Quickbuild, Ansible, AWS Codepipeline, CircleCI As a highly skilled and experienced Lead Software Engineer, I bring a wealth of knowledge and expertise in the areas of Java, Spring, Spring Boot, Big Data, MapReduce, Spark, React, Graphics Design, Logo Design, Email Signatures, Flyers, Web Development (HTML, CSS, Bootstrap, JavaScript & frameworks, PHP, Laravel), responsive web page development, Wordpress and designing, and testing. With over 11 years of experience in the field, I have a deep understanding of Java, Spring Boot, and Microservices, as well as Java EE technologies such as JSP, JSF, Servlet, EJB, JMS, JDBC, and JPA. I am also well-versed in Spring technologies including MVC, IoC, security, boot, data, and transaction. I possess expertise in web services, including REST and SOAP, and am proficient in various web development frameworks such as WordPress, PHP, Laravel, and CodeIgniter. Additionally, I am highly skilled in Javascript, jQuery, ReactJs, AngularJs, Vue.Js, and Node. C#, ASP.NET MVC In the field of big data, I have experience working with MapReduce, Spark, Scala, HDFS, Hive, and Apache NiFi. I am also well-versed in cloud technologies such as PCF, Azure, and Docker. Furthermore, I am proficient in various databases including MySQL, SQL Server, MySql, and Oracle. I am familiar with different build tools such as Maven, Gradle, Git, SVN, Jenkins, Quickbuild, and Ansible.

I help startups and growing businesses build, scale, and maintain backend systems using Java Spring Boot and Node.js, production-ready APIs that hold up under real load. Core stack: Java, Spring Boot, Node.js, Express.js, Next.js, TypeScript, Microservices, RESTful APIs, PostgreSQL, MySQL, MongoDB, Redis, Docker, Kubernetes, AWS, Apache Kafka. What I can help you with: Building production-ready REST APIs and microservices in Java/Spring Boot or Node.js/Express Full-stack development with Next.js and React on the frontend Designing scalable backend architecture for SaaS products Optimizing slow APIs, database queries, and N+1 issues Debugging complex production issues and eliminating recurring bugs Integrating third-party APIs, payment gateways, and external services Building secure authentication systems (JWT/OAuth 2.0) Setting up CI/CD pipelines with Docker, Kubernetes, and Jenkins Recent work: Integrated Elasticsearch into Spring Boot microservices to search 500,000+ records, cutting query response time by 50%. Built and deployed containerized microservices with Docker and Kubernetes. I have a Bachelor's in Technology from DIT University, and I respond within a few hours. Whether your stack is Java or Node.js, I'll match the right tool to your project and ship clean, scalable, production-ready code.