Senior Software Engineer (Frontend) Job at BlackLine (Krakow)

Senior Software Engineer (Frontend)

BlackLine

Location:
Poland , Krakow

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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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

Additional Information:

Job Posted:
February 16, 2026

Employment Type:

Fulltime

Work Type:

Hybrid work

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