Your New Company

One of Europe’s leading consumer retailers is looking to hire a Fullstack Engineer to join its Platform team, a key function within the tech organization responsible for enabling product teams to build and scale high‑quality digital experiences efficiently.

Your New Role

We are looking for a Senior Full Stack Engineer to join a team responsible for building and evolving critical platform services related to payments, transactions, checkout experiences, and distributed systems.

You will be involved in the full software lifecycle, from requirement analysis and technical design to deployment, monitoring, and continuous improvement.

Your responsibilities will include:

- Designing, developing, and maintaining scalable backend services using Kotlin and modern software engineering practices.
- Building and evolving frontend applications using React, TypeScript, HTML5, and CSS3.
- Designing and integrating resilient REST APIs and distributed microservices.
- Participating in architectural discussions and technical decision-making.
- Contributing to the company's cloud migration and modernization initiatives.
- Improving monitoring, observability, and operational excellence across services.
- Taking ownership of services from development through production following DevOps principles.
- Collaborating closely with product, engineering, and platform teams.
- Supporting team growth through knowledge sharing, mentoring, and code reviews.

What will you need to fit in it

- 5+ years of professional experience working with Kotlin.
- Strong knowledge of React, TypeScript, JavaScript, HTML5, and CSS3.
- Solid backend development experience with technologies such as:
- Kotlin
- Java
- Spring Boot
- Node.js
- Express
- Strong experience designing and integrating RESTful APIs.




- Experience building and maintaining microservices architectures.
- Experience with relational and NoSQL databases
- Experience using Git and collaborative development workflows.
- Experience working with cloud platforms, preferably Google Cloud Platform (GCP).
- Hands-on experience with CI/CD pipelines.
- Familiarity with Docker and Kubernetes.
- Strong understanding of software design principles, design patterns, testing strategies, and Clean Code practices.
- Professional-level English communication skills.

Nice to Have
- Experience integrating payment gateways such as Stripe, PayPal, or similar platforms.
- Experience with GitOps tools such as Terraform, Helm, or Flux.
- Knowledge of observability and monitoring tools:
- Grafana
- Prometheus
- Kibana
- Experience operating business-critical services in production environments.
- Experience with AI-assisted development tools such as GitHub Copilot or Claude Code.
- Knowledge of web security best practices.
- Experience working in fast-paced, product-oriented environments.

What will you get in return

- Permanent contract, directly with the final company
- Competitive gross salary in line with your experience (up to 50k)
- Adaptable working hours
- Offices located in Barceloneta or El Prat de Llobregat
- 27 days of vacation per year
- Training budget and language classes
- Young and dynamic tech environment with strong collaboration culture
- Long‑term professional development plan and exposure to cutting-edge technologies

Your next step

If you're interested in this opportunity, click "Apply Now" and send us an updated copy of your CV.

If this role doesn't fully match what you're looking for but you're considering a new opportunity, feel free to contact us for a confidential conversation about your career options.

📌 Kotlin Fullstack Software Engineer (Barcelona)
🏢 Hays
📍 Barcelona