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Spyrosoft career site
Software Delivery · Warsaw (PL) · Hybrid

Lead JavaScript Engineer

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.

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.


    • Department
    Software Delivery
    Role
    Software Engineer
    Locations
    Warsaw (PL)
    Remote status
    Hybrid
    Monthly salary
    PLN220 - PLN255
    Employment type
    Full-time
    Skills
    JavaScript
    Experience
    Lead
    Area
    Fullstack

    About Spyrosoft

    Spyrosoft is an authentic, cutting-edge software engineering company, established in 2016. In 2021 and 2022, we were among the fastest growing technology companies in Europe, according to the Financial Times. We were founded by a group of tech experts with established backgrounds in software engineering, who created an ‘engineer-to-engineer’ workplace, powered by enthusiasm, fairness and authentic relationships. Having a unique offering, which bridge the gap between technology and business, we specialise in technology solutions for industry 4.0, automotive, geospatial, healthcare & life sciences, employee experience & education and financial services industries.

    Founded in 2016
    Co-workers 1800+
    Turnover 104M
    Software Delivery · Warsaw (PL) · Hybrid

    Lead JavaScript Engineer

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