Lead JavaScript Engineer

7 dni temu

Warszawa, Mazovia, Polska Spyrosoft Pełny etat 90 000 zł - 120 000 zł rocznie

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 , 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 , 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.

  • Lead JavaScript Engineer

    7 dni temu

    Warszawa, Mazovia, Polska WINGED IT Pełny etat 100 000 zł - 120 000 zł rocznie

    Employer: KlarnaLocation: Warsaw (hybrid work: 2-3 days in the office)Rate: PLN per hourCooperation model: B2B or Employment ContractStart date: ASAPDuration: long-term agreementRecruitment process: 1 timed Abstract and Logical Reasoning Test (up to 15 minutes); 1 short interview (up to 30 minutes)Do you want to play a key role in revolutionizing the future...

  • Senior Full Stack JavaScript Engineer

    5 dni temu

    Warszawa, Mazovia, Polska Passion Pełny etat 120 000 zł - 180 000 zł rocznie

    Build the Future - Power Full Stack Experiences (and explore AI along the way)Do you…..dream in code{JS} speak fluent JavaScripttinker with AI projects just for fun?At , we empower creators to launch impactful mobile apps that change lives. We're on a mission to build game-changing experiences, and we need a Senior Full Stack JavaScript Engineer who can...

  • Senior/Lead JavaScript Developer

    7 dni temu

    Warszawa, Mazovia, Polska Spyrosoft Pełny etat 60 000 zł - 120 000 zł rocznie

    Job descriptionJoin our team in Warsaw, where we're collaborating on a cutting-edge fintech venture with a global industry leader. Together with our Partner – Klarna, we're building an IT hub designed to drive innovation in digital payment solutions. We're on the lookout for top-tier engineers who thrive in dynamic, forward-thinking environments....

  • Lead Engineer

    3 dni temu

    Warszawa, Mazovia, Polska GE Aerospace Pełny etat 60 000 zł - 120 000 zł rocznie

    Job Description SummaryAt GE Aerospace we believe that the world works better when it's moving. Together we are creating a future of aviation where human safety is of the greatest importance. In our company we have been offering a flexible working model for many years now as to give our employees the possibility to adjust working hours to suit their...

  • Lead Network Engineer

    7 dni temu

    Warszawa, Mazovia, Polska emagine Pełny etat 104 800 zł rocznie

    PROJECT INFORMATION:Industry: electricalRemuneration: up to 200 PLN/h netto + VAT (B2B)Location: 100% remote with occasional visit in WarsawSummary: The Lead Network Engineer role is pivotal in modernizing and managing network solutions for critical SaaS products. This position aims to ensure high availability and minimal downtime of the IT platforms while...

  • Lead Software Engineer

    1 dzień temu

    Warszawa, Mazovia, Polska Bonapolia Pełny etat

    Project/Client: BankingLocation: Baltic States or PolandStart Date: ASAPDuration: Until Seniority: SeniorLanguage: EnglishRole Overview:We are looking for Senior Lead Software Engineer to drive development and integrations within major banking initiatives in the payments, liquidity management, and cards acquiring domains. You will lead technical delivery,...

  • Lead Software Engineer

    1 dzień temu

    Warszawa, Mazovia, Polska Bonapolia Pełny etat

    Project/Client:BankingLocation:Baltic States or PolandStart Date:ASAPDuration:Until Seniority:SeniorLanguage:EnglishRole Overview:We are looking for SeniorLead Software Engineerto drive development and integrations within major banking initiatives in thepayments,liquidity management, andcards acquiringdomains. You will lead technical delivery, shape solution...

  • Lead Engineer

    5 dni temu

    Warszawa, Mazovia, Polska GE Aerospace Pełny etat 60 000 zł - 120 000 zł rocznie

    Job Description SummaryAt GE Aerospace we believe that the world works better when it's moving. Together we are creating a future of aviation where human safety is of the greatest importance.In our company we have been offering a flexible working model for many years now as to give our employees the possibility to adjust working hours to suit their...

  • Lead Engineer

    1 dzień temu

    Warszawa, Mazovia, Polska GE Aerospace Pełny etat

    Job Description SummaryAt GE Aerospace we believe that the world works better when it's moving. Together we are creating a future of aviation where human safety is of the greatest importance.In our company we have been offering a flexible working model for many years now as to give our employees the possibility to adjust working hours to suit their...

  • Lead HVAC Engineer

    5 dni temu

    Warszawa, Mazovia, Polska Haskoning Pełny etat 60 000 zł - 120 000 zł rocznie

    The global digital revolution is bringing prosperity to more and more countries and regions, benefiting millions of people. Data centers make this 21st century transformation possible and reliable systems and continuity are crucial. Royal HaskoningDHV is one of the five leading design and engineering firms in the data center industry and has a...