Software Engineer (React, Java)

BlackLine; Kraków; Hybrid; PLN 201,000 - 252,000; Full time

Job summary

BlackLine, Kraków-based technology company, is seeking a Front-End Software Engineer on the UI Platform team to build a React-based front end and contribute to the shared component library and App Shell powering our enterprise web platform.

You'll pair with senior engineers to implement features, fix bugs, and improve reliability of our front-end platform, while gaining hands-on exposure to Java backend, cloud-native architecture, and CI/CD tooling like Jenkins and GitHub Actions.

Qualifications

• 2–4 years of professional software development experience.
• Cloud-native architecture with GCP, CI/CD with Jenkins/GitHub Actions, and Terraform.
• Solid SDLC understanding from requirements to implementation.
• Familiar with modern build tools like Webpack and npm.
• Strong problem-solving, attention to detail, and willingness to learn new technologies.

Responsibilities

• Develop and maintain React-based component library and App Shell.
• Implement front-end features and fix bugs; collaborate with seniors.
• Migrate legacy .NET apps to React with micro-frontend architecture.
• Build backend services in Java and support cloud deployments.
• Write tests (unit/integration) and contribute to code reviews.

Skills

2–4 years experience

Strong problem-solving

Proactive learning

Tools

Webpack

npm

Jenkins

GitHub Actions

Terraform

GCP

Job description

Join BlackLine as a Front-End Software Engineer on the UI Platform team. This role has a primary focus on front-end development, mainly in React, including our shared component library and the App Shell that powers our enterprise web platform. Alongside this, you will build hands‑on, practical experience with Java backend services, cloud architecture, and CI/CD — not just theoretical knowledge, but real work implementing and deploying backend and infrastructure changes.

This is a hands‑on coding role where you will grow your skills in a complex, cloud‑native environment. You will work closely with senior engineers to implement features, fix bugs, and improve the reliability of our front‑end platform infrastructure.

You'll Get To:

• Component Library Development: Develop and maintain our shared React‑based component library: building new components and enhancing existing ones to ensure a consistent, scalable UI across the platform.
• App Shell Development: Contribute features and improvements to the React‑based micro‑frontend App Shell, ensuring seamless inter‑app communication.
• Modernize & Migrate: Contribute to the migration from legacy applications (.NET) to modern React‑based solutions with micro‑frontend architecture.
• Backend Development: Implement and maintain backend services in Java: hands‑on coding, not just supporting role, including writing and debugging production logic that the front end depends on.
• Cloud & DevOps: Work directly with cloud‑native architecture (e.g., GCP), configure and monitor CI/CD pipelines (Jenkins, GitHub Actions), and participate in cloud deployments using Terraform.
• Code Quality: Write clean, maintainable front‑end code following solid best practices. Write tests (unit, integration) to ensure high coverage and stability.
• Collaboration: Participate in code reviews, learn from senior mentors, and collaborate with other developers to resolve full‑stack issues.

What You'll Bring:

• Experience: 2–4 years of professional experience in software development.
• Cloud & DevOps Experience: Practical experience with cloud‑native architecture, particularly GCP (or comparable major cloud platforms), and real‑world exposure to CI/CD pipelines (Jenkins, GitHub Actions) and infrastructure‑as‑code tools such as Terraform.
• Development Lifecycle: Solid understanding of the full SDLC, from analyzing stakeholder requirements to technical implementation.
• Tooling: Familiarity with modern build tools (Webpack, npm).|
• Soft Skills: Strong problem‑solving skills, attention to detail, and a proactive attitude towards learning new technologies like design systems, micro‑frontends, and cloud architecture.

Total Base Pay Range

201 000,00 - 252 000,00 PLN annual

Thrive at BlackLine Because You Are Joining:

• 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!
• A culture that is kind, open, and accepting. It's a place where people can embrace what makes them unique, and the mix of cultural backgrounds and varying interests cultivates diverse thought and perspectives.
• 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.

BlackLine is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity or expression, race, ethnicity, age, religious creed, national origin, physical or mental disability, ancestry, color, marital status, sexual orientation, military or veteran status, status as a victim of domestic violence, sexual assault or stalking, medical condition, genetic information, or any other protected class or category recognized by applicable equal employment opportunity or other similar laws.

BlackLine recognizes that the ways we work and the workplace itself has shifted. We innovate in a workplace that optimizes a combination of virtual and in‑person interactions to maximize collaboration and nurture our culture. Candidates who live within a reasonable commute to one of our offices will work in the office at least 3 days a week.

Accommodations:

BlackLine is committed to creating an inclusive and accessible experience for all candidates. If you require a reasonable accommodation that would better enable your success during the application or interview process, please complete this form.