More in details,

UST

is a multinational company based in North America, certified as a

Top Employer

and

Great Place to Work

company with over 35,000 employees

all over the world and presence in more than 35 countries

. We are leaders in digital technology services, and we provide large-scale technological solutions to big companies.

We are looking for a

Java Developer

to join a highly innovative team working within a

microservice-based cloud environment

in the utility technology sector. You will play a key role in designing, developing, and supporting secure, scalable, and maintainable Java services, APIs, and integrations that connect critical business systems and internal tools.

⚙ Design and implement Java services, REST APIs, integration adapters, and extension components using Java and the Spring ecosystem. Build and optimize persistence layers using Hibernate/JPA and SQL best practices. Integrate microservices and internal tools with CRM, finance, payment, analytics, web, and mobile platforms. Create and maintain unit, integration, component, and contract tests to ensure high-quality software delivery. Troubleshoot production incidents using logs, metrics, traces, and database analysis, providing sustainable root-cause solutions. Support CI/CD pipelines, automated quality controls, deployment processes, and cloud-native engineering practices. Ensure solutions meet performance, reliability, scalability, and security standards.

Strong professional experience developing enterprise applications with

Java

.



Hands-on experience with

Spring Framework

and

Spring Boot

. Solid knowledge of

Hibernate/JPA

, relational databases, and

SQL optimization

. Strong testing experience using

JUnit

,

Mockito

, and integration/contract testing frameworks. Experience working with

Git

,

Maven/Gradle

, CI/CD pipelines, and code review practices. Understanding of secure coding principles, authentication, authorization, observability, logging, and monitoring. Excellent communication skills and

fluent English.

Experience in utility, customer information, billing, payment, or energy-sector platforms. Knowledge of platforms such as

SAP Utilities

,

Oracle Utilities

,

Kraken Technologies

, or

Hansen

. Experience with

AWS

, including: API Gateway Lambda Fargate SQS/SNS Aurora CloudWatch IAM Experience with containers, infrastructure-as-code, and cloud-native deployment patterns. Knowledge of distributed tracing, performance testing, and production support for high-volume systems. Understanding of customer, metering, usage, tariff, billing, payment, and debt-management processes within utilities.

Numerous benefits (Health Care Plan, Internet Connectivity, Life and Accident Insurances). ~ Retribución Adaptable Program: (Meals, Kindergarten, Transport, Online English Lessons, Health Care Plan…) ~ Free access to several training platforms. ~ Real Work-Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…). ~

📌 Senior Java Developer (AWS) - Remote (Madrid)
🏢 UST España & Latam
📍 Madrid