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BlackLine

Senior Frontend Developer

BlackLine
Poland · Full-time · Mid-Senior

Summary


Since being founded in 2001, BlackLine has become a leading provider of cloud software that automates and controls the entire financial close process. Our vision is to modernize the finance and accounting function to enable greater operational effectiveness and agility, and we are committed to delivering innovative solutions and services to empower accounting and finance leaders around the world to achieve Modern Finance.


We're a technology-based company with a sense of adventure and a vision for the future. Every door at BlackLine is open. Just bring your brains, your problem-solving skills, and be part of a winning team at the world's most trusted name in Finance Automation.


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.

Work Mode – Hybrid (3 days)

What You’ll Do

  • Component Development: Design and implement scalable front-end features and contribute to reusable component libraries, leveraging technologies such as Webpack Module Federation.
  • Modernize & Migrate: Execute the migration from legacy .NET applications to modern React-based solutions within the micro-frontend App Shell architecture.
  • Define Integration Strategies: 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.
  • Drive Engineering Excellence: Implement performance optimizations, observability, and security improvements across assigned front-end systems.
  • Quality & Standards: Write clean, secure, and maintainable code that meets performance standards. Champion code quality through peer code reviews, and comprehensive testing (Unit, Integration, E2E).
  • Mentorship: Mentor junior developers, share knowledge with the team, and contribute to continuous process improvements.

What You’ll Bring

  • Experience: 4–8 years of professional experience in front-end software development.
  • Core Technologies: Expertise in JavaScript, TypeScript, React, and modern build tools (Webpack, Vite, Rollup).
  • Architecture: Solid understanding of micro-frontends, legacy modernization, and experience with CI/CD pipelines for cloud deployments.
  • SDLC Ownership: Experience managing the feature lifecycle: from translating stakeholder requirements into technical specifications to driving the development process.
  • Testing & Accessibility: Proficiency in unit testing and end-to-end testing using Jest, Testing Library, Vitest, and Playwright.
  • UI & Design Systems: A deep understanding of design systems, including Storybook, design tokens, component-driven development, and CSS preprocessors (SASS/LESS) and responsive design for flexible layouts.
  • Accessibility & Global Reach: Strong knowledge of web accessibility (WCAG standards) and internationalization (i18n).
  • Backend & Microservices: Experience with backend technologies and microservices architecture is a plus.
  • Soft Skills: Ability to work independently on complex tasks, estimate deliverables accurately, and collaborate effectively in an agile environment.

Key Skills

Ranked by relevance

cloud responsive design design systems microservices responsive css
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Posted
Feb 13, 2026
Type
Full-time
Level
Mid-Senior
Location
Cracow
Company
BlackLine

Industries

Software Development Internet Marketplace Platforms

Categories

Engineering

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