Lead JavaScript Engineer

Senior • Hybrid

$220 - $255/

Warsaw, Poland

We’re looking for an experienced Lead Software Engineer to join Klarna’s engineering team. You’ll play a critical role in building scalable, reliable systems and driving technical excellence across our products. This position combines hands-on coding with leadership, mentorship, and strategic decision-making.

We offer a hybrid work model in Warsaw’s vibrant Wola district, with 3 days in the office each week. English fluency and eligibility to work in Poland are essential, as is the successful completion of a background check to meet the rigorous standards of the financial domain.

Main responsibilities:

System Architecture & Technical Leadership: Design and lead the development of scalable, high-performance systems that meet business goals.
Kafka Management: Handle advanced Kafka configurations, manage traffic, and optimize topic production and consumption.
Backend Engineering: Develop and test robust applications using Node.js, TypeScript, and Jest.
Database Design: Architect and maintain PostgreSQL and DynamoDB databases for performance and scalability.
Project Ownership: Drive delivery, manage stakeholders, identify and address technical debt, and define technical roadmaps.
Mentoring & Team Development: Guide engineers in their growth, conduct code reviews, lead demos, and create technical documentation.
Quality Assurance: Apply best practices in software testing, ensuring reliability and maintainability across codebases.
Cross-functional Collaboration: Align with product, design, and infrastructure teams to deliver integrated, high-impact features.

Requirements:

10+ years of professional software engineering experience, including significant time in technical leadership roles.
Expertise in Kafka, including production-ready setup, optimization, and usage patterns.
Strong command of Node.js, TypeScript, and Jest for backend development and testing.
Proven experience with PostgreSQL and DynamoDB in large-scale environments.
Demonstrated ability to lead complex projects, manage technical roadmaps, and deliver high-quality software in a fast-paced setting.
Track record of mentoring engineers, building cohesive teams, and fostering a learning culture.
Excellent communication and collaboration skills, with the ability to engage across multiple teams and stakeholders.
Strategic mindset with the ability to make both tactical and long-term technical decisions.

Spyrosoft

Spyrosoft is a dynamic company operating in the technology industry, specifically focusing on fintech solutions. The company is engaged in a collaborative venture with Klarna, a global leader in digital payment solutions, to establish an IT hub that fosters innovation in online shopping and payment systems. Spyrosoft values independence, proactiveness, and flexibility, creating an environment that encourages forward-thinking and dynamic work. The company is based in Warsaw, Poland, and offers a hybrid work model, reflecting its commitment to modern and adaptable work practices. Spyrosoft is dedicated to facilitating a seamless recruitment process, emphasizing a strong cultural fit and technical expertise in its candidates. The company is known for its rigorous standards, particularly in the financial domain, ensuring high-quality and secure digital solutions.