Wizeline

Senior JavaScript Software Engineer (Barcelona - Hybrid)

Wizeline

Barcelona, SpainPosted Jul 14, 2026

Job description

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:

Key Responsibilities

  • Design, develop, and maintain scalable backend services using Node.js**.
  • Build and optimize cloud-native applications on AWS**.
  • Develop and maintain event-driven and messaging-based architectures using SQS** and SNS**.
  • Design and manage serverless solutions with AWS Lambda**.
  • Work with DynamoDB** to build high-performance, scalable data solutions.
  • Collaborate with cross-functional teams to deliver reliable, low-latency backend services.
  • Monitor, troubleshoot, and optimize system performance, availability, and scalability.
  • Participate in code reviews and contribute to engineering best practices.

Must-have Skills*** ***

  • +5 years of experience working as a Frontend Engineer.

  • Strong experience with Node.js** and backend application development.

  • Hands-on experience with AWS**, including:

  • EC2

  • Lambda

  • SQS

  • SNS

  • DynamoDB

  • Experience designing and developing scalable distributed systems.

  • Knowledge of asynchronous programming and event-driven architectures.

  • Experience building RESTful APIs and backend integrations.

  • Strong problem-solving and debugging skills.

  • Excellent communication and collaboration skills.

Nice-to-have:

  • **AI Tooling Proficiency: **Leverage one or more AI tools to optimize and augment day-to-day work, including drafting, analysis, research, or process automation. Provide recommendations on effective AI use and identify opportunities to streamline workflows.
  • Experience building systems that process millions of messages per day** with high reliability.
  • Experience designing and optimizing low-latency** distributed systems.
  • Knowledge of graceful degradation** strategies to ensure service resilience under failure conditions.
  • Experience with high-availability, fault-tolerant, and cloud-native architectures.
  • Familiarity with performance optimization and scalability best practices.

Experience developing projects using frameworks.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 .