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Alternant develops React/TypeScript frontend interfaces for air-traffic management software, working with UI/UX design and agile teams.
Build and maintain scalable Java backend services using Spring Boot, microservices, Kafka, and MongoDB in a hybrid role based in Buenos Aires.
Build and maintain Android SDKs for secure identity and payment solutions using Kotlin/Java, focusing on mobile security and NFC payments.
Build and maintain scalable Java/Spring Boot microservices, design event-driven systems with Kafka, and model data in MongoDB on cloud platforms like AWS or OpenShift.
Backend Java Senior building microservices with Spring Boot, Docker, Kubernetes, and CI/CD pipelines; writes automated tests and maintains high-quality code.
Build and maintain Java EE web portals and CMS for public-sector and private clients using Java, JSF, JSP, REST, and Oracle WebLogic/WebSphere.
Develop and deploy Java/JEE applications, tools, and modules for clients using agile methods, Hibernate, JPA, Maven, and SQL.
Build and maintain web-based email marketing software using Java, JSP, Tomcat, and agile practices like test-driven development.
Builds enterprise Java web apps and distributed systems using Java frameworks and tools like JUnit, Maven, and SQL.
Builds Java/JEE applications using Spring and open-source frameworks, participates in design and testing, and may lead small projects after onboarding.
Builds Java-based desktop applications with SWT/JFace, designs SQL databases, writes JUnit tests, and analyzes performance for a tax-advisory software provider.
Develops Java applications and extends software for front- and back-end in Munich, shaping software architecture.
Diagnose, fix, and deploy backend changes in Java for live production systems using RESTful APIs, microservices, and PostgreSQL.
Designs and builds Java-based backend services for a financial data platform using Spring, JUnit, and Mockito, ensuring high test coverage and system integration.
Build and maintain Java-based microservices using Spring Boot and Kafka, working with SQL/NoSQL databases and CI/CD pipelines in a hybrid role.
Designs and builds secure, scalable backend services and REST/GraphQL APIs in Java/Spring Boot, and integrates agentic AI workflows using LLM frameworks for automation and decision support.
Design and build secure, scalable backend services and REST/GraphQL APIs in Java/Spring Boot, and integrate agentic AI workflows using LLM frameworks for automation and decision support.
Senior/Lead Frontend Engineer builds and maintains high-performance web apps using Vue.js/React/Angular, integrates with backends, and ensures scalability and accessibility for Upwork’s global work marketplace.
Build and maintain Android apps for a financial-sector client using Java/Kotlin, Jetpack Compose, and CI/CD pipelines.
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