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Senior Software Engineer (Frontend)

Poland, Krakow · Job Posted February 16, 2026
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Job Description

Join BlackLine as a Senior Front-End Engineer and contribute to the modernization of our enterprise web platform. You’ll architect and implement micro-frontend App Shell architecture, migrate features from legacy .NET systems, and implement front-end standards within the team. This is a hands-on coding role focused on building high-performance, secure, and accessible web applications using modern technologies.

Job Responsibility

  • Design and implement scalable front-end features and contribute to reusable component libraries, leveraging technologies such as Webpack Module Federation
  • Execute the migration from legacy .NET applications to modern React-based solutions within the micro-frontend App Shell architecture
  • Implement shared authentication and login workflows across multiple micro-apps, configure URL routing for multiple apps on the same domain, and enable inter-app communication
  • Implement performance optimizations, observability, and security improvements across assigned front-end systems
  • Write clean, secure, and maintainable code that meets performance standards
  • Champion code quality through peer code reviews, and comprehensive testing (Unit, Integration, E2E)
  • Mentor junior developers, share knowledge with the team, and contribute to continuous process improvements

Requirements

  • 4–8 years of professional experience in front-end software development
  • Expertise in JavaScript, TypeScript, React, and modern build tools (Webpack, Vite, Rollup)
  • Solid understanding of micro-frontends, legacy modernization, and experience with CI/CD pipelines for cloud deployments
  • Experience managing the feature lifecycle: from translating stakeholder requirements into technical specifications to driving the development process
  • Proficiency in unit testing and end-to-end testing using Jest, Testing Library, Vitest, and Playwright
  • A deep understanding of design systems, including Storybook, design tokens, component-driven development, and CSS preprocessors (SASS/LESS) and responsive design for flexible layouts
  • Ability to work independently on complex tasks, estimate deliverables accurately, and collaborate effectively in an agile environment

Nice to have

  • Strong knowledge of web accessibility (WCAG standards) and internationalization (i18n)
  • Experience with backend technologies and microservices architecture

What we offer

  • A technology-based company with a sense of adventure and a vision for the future
  • A culture that is kind, open, and accepting
  • A culture where BlackLiner's continued growth and learning is empowered
  • BlackLine offers a wide variety of professional development seminars and inclusive affinity groups to celebrate and support our diversity

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