02.10.2026 aktualisiert
100 % verfügbar
Senior Backend Engineer | Java & Spring Boot | Cloud & Distributed Systems
Habana, Kuba
Nur Remote
Bachelor's Degree in Computer ScienceÜber mich
Hi, I'm Lazaro a Software Engineer over 5 years of experience on the IT world, since 2022 when I earned my Bachelor's Degree in Computer Science I have been working with differents companies and enterprise in order to given my knwolegde contributing with MVP goals. Inbox me if you interested.
Skills
AI AgentsClean CodeJavaSpring SecurityDevOpsHibernateJasperreportsSpring FrameworkPythonPostgreSQLRedisAngular 2+System DesignSpring CloudSpring MVC
Java & Spring Boot Backend Development
Expertise in building enterprise REST APIs and backend business logic using Java 21, Spring Boot, Spring MVC, Spring WebFlux, Spring Data and Spring Security, with strong knowledge of Hibernate, JPA and HQL for complex data access and performance optimization.
Distributed Systems & Messaging
Solid background in designing and operating distributed systems using Kafka, Kafka Streams, RabbitMQ and event-driven architectures, enabling high-volume asynchronous data processing and pipeline enrichment.
Cloud & DevOps (AWS, Docker, CI/CD)
Hands-on experience deploying and maintaining backend services on AWS EC2 with Docker, Apache Tomcat and Linux, supported by GitLab CI/CD and Jenkins pipelines for continuous integration and delivery.
Database Engineering & Query Optimization
Deep knowledge of PostgreSQL, Oracle, MongoDB and Elasticsearch, including complex SQL/PL/SQL, HQL query optimization, profiling, indexing, stored procedures and bulk operations for demanding enterprise workloads.
Frontend Development
Practical experience with Angular, TypeScript, JavaScript, Angular Material, PrimeNG, HTML, CSS, Thymeleaf and JSP for building and optimizing frontend components and services.
AI & Automation Workflows
Experience building AI/RAG automation workflows and n8n API automation flows integrating WhatsApp, Telegram and enterprise backend processes, using Spring AI, Ollama, pgvector and AI agents.
Microservices Architecture & Modernization
Proven track record migrating enterprise microservices from Java 8/Spring Boot 2 to Java 21/Spring Boot 3, developing reusable Maven libraries and modernizing application stacks for scalability and maintainability.
Testing & Quality Assurance
Application of JUnit, Mockito, Cucumber, TDD and BDD practices to ensure software quality, stability and reliability across enterprise backend systems.
WMS & Business Process Integration
Design and implementation of high-complexity WMS flows and stock-allocation logic, applying business rules around warehouse operations, inventory availability, goods in transit and allocation decisions. Working on Openbravo ERP solving existing performance issues and creating new features
Erfahrung
Berufserfahrung5 - 10 Jahre
Freelancer seit2022
Sprachen
EnglishverhandlungssicherSpanishMuttersprache
Projekthistorie
Developing enterprise REST APIs and backend business logic using Java and Spring Boot, integrating complex business processes with PostgreSQL and external systems. Designing WMS flows, stock-allocation logic, complex Jasper Reports, n8n API automation flows for WhatsApp and Telegram, AI/RAG automation workflows, and deploying backend services on AWS EC2 with Docker and GitLab CI/CD pipelines.
Achieved up to 70% faster data processing by introducing concurrency into pipelines reading from Oracle/PostgreSQL and publishing to Kafka and Elasticsearch. Improved legacy service performance by approximately 50%, migrated microservices from Java 8/Spring Boot 2 to Java 21/Spring Boot 3, developed Kafka Streams pipelines, optimized Elasticsearch queries, implemented CI/CD pipelines with GitLab and Jenkins, and developed Angular components with PrimeNG and Angular Material.
Developed and maintained enterprise banking functionality in a large monolithic platform using Java, Spring MVC, JavaScript and AJAX. Developed Oracle PL/SQL views, queries, stored procedures and triggers, optimized legacy financial-calculation logic resolving 15+ production issues, and deployed Java web applications to Apache Tomcat in Linux environments using Maven, Nexus and Catalina.