Senior Frontend Developer

Role: Senior Software Engineer

Location: Stockholm, SE

Type: Contract

Job Responsibilities

• Own the end-to-end delivery of complex frontend features, from solution design through production deployment.
• Design and implement scalable, maintainable architectures for large-scale web applications, including modularization, code splitting, and performance optimization strategies.
• Define and drive frontend state management approaches using modern frameworks and libraries to ensure predictable, efficient data flow.
• Build and integrate frontend applications with APIs and backend-for-frontend (BFF) services, contributing to backend development when required.
• Translate business, product, and design requirements into intuitive, accessible, and responsive user interfaces that adhere to modern web standards and accessibility guidelines.
• Optimize application performance across rendering, bundle size, network utilization, caching, and overall user experience.
• Establish and champion engineering standards, design patterns, and best practices to maintain a high-quality codebase.
• Perform thorough code reviews, provide technical mentorship, and contribute to the growth of engineering teams.
• Proactively identify, troubleshoot, and resolve issues across development, testing, and production environments using structured debugging methodologies.
• Diagnose and remediate complex production incidents through effective use of logging, monitoring, and observability tools.
• Incorporate security best practices throughout the software development lifecycle, including secure coding, authentication, authorization, input validation, and data protection.
• Collaborate closely with cross-functional teams including backend engineering, platform engineering, security, product management, and design to deliver reliable, scalable solutions.
• Contribute to CI/CD pipelines, automated testing strategies (unit, integration, and end-to-end), and release management processes.
• Participate actively in Agile development practices, including planning, estimation, backlog refinement, and iterative delivery.

Required Qualifications

• Strong experience building modern web applications using TypeScript and React.
• Proven experience designing and scaling frontend architectures for enterprise-grade applications.
• Deep understanding of frontend state management, component design, and application performance optimization.
• Experience integrating with RESTful APIs and modern web services.
• Strong knowledge of web accessibility standards, semantic HTML, responsive design, and modern CSS practices.
• Demonstrated ability to troubleshoot complex technical issues and drive solutions independently.
• Experience with automated testing, code quality practices, and CI/CD workflows.
• Excellent communication, collaboration, and mentoring skills.

Preferred Qualifications

• Experience working on payment, transaction-processing, or other highly regulated systems.
• Full-stack development experience, including backend development with Node.js.
• Familiarity with cloud-native architectures, CDN strategies, and edge optimization techniques.
• Experience building and maintaining design systems or large-scale component libraries.
• Knowledge of modern observability, monitoring, and performance analysis tools.