Senior Software Developer

OneSpan

Barcelona, Spain

You’ll be involved in the design, development, testing, and delivery of our Mobile Application Security Platform, working across both frontend and backend systems. You will help build scalable services and intuitive user interfaces that enable our security technologies and products. You’ll find yourself working on modern web architectures, developing high-quality code with strong test coverage and frequent releases thanks to CI and automated build infrastructure.

Job Duties and Responsibilities

Design and develop end-to-end features across frontend and backend systems.
Build modern web interfaces and scalable backend APIs that power our products and services.
Translate product requirements and wireframes into high-quality technical solutions.
Write clean, maintainable, and testable code across the full stack.
Collaborate closely with product managers, designers, mobile developers, and other backend engineers.
Improve the performance, scalability, and usability of our platform as the business grows.
Contribute to technical architecture, code reviews, and development best practices.
Participate actively in the team’s life and contribute to technical decision-making.

Requirements

5+ years of professional experience in software development, working across frontend and backend technologies.
Strong experience building modern web applications and RESTful APIs.
Experience with JavaScript/TypeScript frontend frameworks (e.g., React, Angular, or Vue).
Experience with backend development (Python, Node.js, Java, or similar).
Good understanding of software architecture, design patterns, and scalable systems.
Experience translating business requirements into technical designs.
Understanding of testing tools and methodologies.
Ability to communicate clearly in English, both verbally and in writing.
Ability to work independently while collaborating effectively with a team.
Programming with AI agents is part of your day-to-day work, including designing and orchestrating LLM-based workflows and integrating them into production systems.