Senior Java Developer at WIZELINE

Barcelona, Catalonia, Spain -

Full Time

Start Date

Immediate

Expiry Date

29 Apr, 26

Salary

0.0

Posted On

29 Jan, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Java, Spring Boot, Microservices, Docker, Kubernetes, CI/CD, AWS, Azure, JUnit, Mockito, Performance Optimization, Concurrency, Memory Management, RESTful APIs, Architectural Design, Troubleshooting

Industry

IT Services and IT Consulting

Description

Senior Java Developer We are: 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. Are you a fit? Sounds awesome, right? Now, let’s make sure you’re a good fit for the role: We are looking for a Senior Java Developer to design, build, and scale high-performance backend systems in a modern, cloud-native environment. In this role, you will work on distributed, mission-critical applications, collaborate with cross-functional teams, and contribute to architectural decisions that impact product scalability, reliability, and performance. Key Responsibilities 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. Must-have Skills 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). Nice-to-have 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. What we offer A High-Impact Environment Commitment to Professional Development Flexible and Collaborative Culture Global Opportunities Vibrant Community Total Rewards *Specific benefits are determined by the employment type and location. Find out more about our culture here.

Responsibilities

The Senior Java Developer will design, develop, and maintain scalable backend services while collaborating with cross-functional teams. They will also contribute to architectural decisions and troubleshoot production issues.