Hire the Best Java Developers
in Argentina

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

🚀 Experienced Java Developer and Full-Stack Web Developer Hello! I am a Java developer with expertise in the Spring framework. While my core focus is backend development, I also build user interfaces using modern frontend technologies, primarily React with TypeScript. I design and develop software solutions by implementing scalable and maintainable architectures that address business needs and support long-term growth. 👨‍💻 Technical Skills: Backend Development: Java, Spring Framework, Spring Security, RESTful API Frontend Technologies: JavaScript, TypeScript, React, HTML, CSS, Tailwind Database Management: JPA Hibernate, MySQL. 💡 What I Bring to the Table: Full-Stack Proficiency: I am not just limited to backend development; I bring a holistic approach to projects by seamlessly integrating frontend and backend technologies. Problem Solver: I thrive on solving complex problems and architecting solutions that are both elegant and efficient. Agile Development: Adapting to change is essential in the tech world, and I am well-versed in Agile methodologies to ensure flexibility and efficiency in project delivery. 🌐 Why Work With Me: Client-Centric Approach: Your project's success is my top priority, and I am dedicated to delivering solutions that exceed your expectations. 📈 Let's Build Something Amazing: If you are looking for a skilled and reliable developer with a passion for innovation, I am excited to collaborate on your next project. Let's turn your ideas into reality and create something extraordinary!

I help companies build and evolve reliable backend systems, integrations, and automation workflows. I work in two modes depending on what the client needs: - as an independent engineer delivering a scoped backend project end-to-end - as a senior embedded engineer augmenting an existing team on a long-term hourly contract I have 15+ years of hands-on experience in Java/Kotlin backend engineering across enterprise platforms, internal systems, and automation-heavy workflows. My work includes backend services for compliance, fee processing, reporting, custom business workflows, and third-party integrations. In one long-term enterprise engagement, I built and evolved services that reduced manual operations by 65–85%, supported worker-classification workflows, and included ownership of 8+ production microservices. I can help with: - Java/Kotlin backend development with Spring Boot, Dropwizard, and Quarkus - REST/gRPC APIs and third-party integrations, including Salesforce - Microservices, RBAC, multi-tenancy, service decomposition, and production support - PostgreSQL, MongoDB, AWS/Azure, Docker, Kubernetes - CI/CD with GitHub Actions and Jenkins - Observability with OpenTelemetry and Grafana I also have practical experience with AI/LLM-based automation for document and data workflows: - LLM-powered classification, extraction, and workflow automation - OpenAI API / local LLM integrations - backend services and tooling for processing documents, structured data, and internal knowledge workflows I’m most useful when you need a senior engineer who can understand complex business logic, translate it into maintainable backend services, and deliver reliably with minimal hand-holding.

I’m a senior software engineer with ~17 years in production systems and 9+ years working with clients on Upwork and off-platform. I originally worked here as a Salesforce developer; today my strongest leverage is Flutter: shipping complete mobile apps quickly, cleanly, and with good judgment. I’m not a “junior Flutter specialist” and I’m not a large team. I’m the person you bring in when you need one senior engineer who can take ownership, make good architectural decisions, and actually finish things. What I do best: 1. Build Flutter apps from scratch or take over existing ones 2. Turn vague ideas into concrete, working software 3. Move fast without creating messes you’ll regret later 4. Make pragmatic trade-offs instead of over-engineering

Hello! My name is Alexander, and I can provide you high-quality software. I have 10 years of experience in software development. I primarily work with: - Java, Python - Clouds: AWS, GCP - HTML, CSS, Javascript - Twitter Bootstrap, Spring, Bottle Py - MySQL, Postgres - OS Linux

I am a System's Engineer living in Argentina and I have been working as a Senior Software Engineer for the past 9+ years. These are some projects I have worked on: jBilling: Canadian company that has a Complex Billing System ideally for Telco companies or any company that sell services based on subscriptions. Stack: Java J2EE, Grails, Hibernate, Spring, Hbase, Hadoop, ActiveMQ, RabbitMQ, Apache Velocity, Jasper Report, jQuery, HTML, CSS and PostgreSQL Taaxii: Argentinean Company that has a solution for Travel Logistics for Company Employees. Stack: Java J2EE, Hibernate, GWT, Ibatis, Android, iOS, MySQL, AWS EC2, AWS S3, AWS RDS and Other AWS Services. Evolticom: Sweedish Company that had a CRM Web Solution. Stack: Grails, Bootstrap and PostgreSQL. DXC: Former HPE area where I worked with them to implement jBilling for the City of Dubai. FusionSleep: US Company that had a solution to control Truck drivers sleep behaviors. Stack: Grails, HTML, CSS and PostgreSQL. Autoentrada: Argentinean Company with a web solution for selling theater tickets online. Stack: Java J2EE, Struts, Ibatis, Jasper Report, HTML, CSS, PostgreSQL. Workia: Argentienan Company specialized in Human Resources Management. Stack: Java J2EE, Spring Boot, Angular JS, Microservices, HTML, CSS. SouthWest Airlines: Main US Low Cost Airline Company. I was involved in migrating existing applications to Java Web based solutions. Stack: Java J2EE, Spring, Spring MVC, Hibernate, HTML, CSS, Grails. Main roles and responsabilities I was involved in these projects: Analysis, Technical Design, Development, Testing, Team Leader, Technical Leader, DevOps.