Senior Java Developer

BarcelonaFull-TimeSeniorOther

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Wizeline, a global AI-native technology solutions provider, develops cutting-edge, AI-powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a global community of innovators, we foster a culture of growth, collaboration, and impact.
With the right people and the right ideas, there’s no limit to what we can achieve.

Design, develop, and maintain scalable, high-performance backend services using Java (11/17/21) and Spring Boot.
Build and evolve RESTful APIs and microservices following best practices for reliability, security, and maintainability.
Design and support distributed systems and microservices architectures, leveraging Docker, Kubernetes, and service mesh patterns (e.g., Istio).
Collaborate with DevOps and platform teams to implement and improve CI/CD pipelines, deployment strategies, and environment management.
Optimize application performance through profiling, monitoring, and tuning of memory, concurrency, and data processing.
Ensure high code quality through unit, integration, and automated testing.
Participate in architectural discussions and provide technical guidance to peers.
Troubleshoot production issues and contribute to continuous system improvements.

Optimize application performance through profiling, monitoring, and tuning of memory, concurrency, and data processing.
Ensure high code quality through unit, integration, and automated testing.
Participate in architectural discussions and provide technical guidance to peers.
Troubleshoot production issues and contribute to continuous system improvements.

Bachelor’s Degree in Computer Science, Engineering, or a related field.
5+ years of professional experience as a Java Developer or Backend Engineer.
Advanced knowledge of Java (11/17/21), including multithreading, concurrency, memory management, and performance optimization.
Strong experience with Spring Framework and Spring Boot, including Spring Data/JPA.
Hands-on experience designing and maintaining microservices-based architectures.
Proficiency with Docker and Kubernetes, including deployment and orchestration concepts.
Solid understanding of CI/CD pipelines (e.g., Jenkins), automated testing, and release management.
Experience working in cloud environments such as AWS or Azure.
Strong background in unit and integration testing using JUnit, Mockito, or similar frameworks.
Experience defining performance metrics, identifying bottlenecks, and resolving scalability issues.
English level: Advanced / Fluent (spoken and written).
Bachelor’s Degree in Computer Science, Engineering, or a related field.

Experience defining performance metrics, identifying bottlenecks, and resolving scalability issues.

AI Tooling Proficiency: Ability to leverage AI tools to optimize day-to-day work, including code generation, debugging, documentation, analysis, or process automation. Identify opportunities to improve developer productivity using AI.
Experience with monitoring and observability tools such as Prometheus and Grafana.
Knowledge of advanced deployment strategies (blue/green, canary, rolling updates).
Exposure to event-driven architectures or messaging systems (Kafka, RabbitMQ).
Experience working in agile or DevOps-oriented teams.

Knowledge of advanced deployment strategies (blue/green, canary, rolling updates).
Exposure to event-driven architectures or messaging systems (Kafka, RabbitMQ).
Experience working in agile or DevOps-oriented teams.