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Full Stack Engineer

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Kayzen

Job

  • Level
    Senior
  • Job Field
    Web, Software, Full Stack
  • Employment Type
    Full Time
  • Contract Type
    Permanent employment
  • Location
    Berlin
  • Working Model
    Full Remote, Hybrid, Onsite

    • Job Summary

    In this role, you will develop high-performance UIs and integrate APIs while working with AI-assisted tools, collaborating closely with various teams to implement innovative features.

    Job Technologies

    Your role in the team

    • We are looking for a coding-first Fullstack Engineer who thrives on turning complex product requirements into high-performance UIs.
    • You should be comfortable working across the stack, contributing to architecture discussions, and be an early adopter of AI-assisted engineering (e.g., Claude Code, Cursor, Copilot) in your daily coding workflow.
    • Design, build, and maintain high-quality features across the Fullstack stack, from UI to API integration.
    • Write clean, well-tested, production-ready code and actively participate in code reviews.
    • Collaborate closely with Product, Design, QA, and Backend teams to deliver cohesive, user-centric features.
    • Contribute to technical decisions around architecture, tooling, and best practices within the team.
    • Take ownership of features end to end, from planning through deployment and monitoring.
    • Integrate AI-powered coding agents and automated LLM-based testing into your daily development cycle.
    • Contribute to building 'AI-First' UI patterns, working alongside the LLM Platform team on generative, prompt-driven interfaces.
    • Stay current with emerging AI-assisted development tools and bring relevant ones back to the team.
    • Break down assigned product requirements into clear, actionable engineering tasks.
    • Liefern Sie die Arbeit zuverlässig innerhalb der Sprint-Verpflichtungen und melden Sie Blockaden oder Scope-Änderungen frühzeitig.
    • Balance new feature delivery with addressing technical debt in the codebase you work on.

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    Our expectations of you

    Qualifications

    • Solid expertise in at least one major framework (React, Angular, or Vue) and its ecosystem.
    • Strong understanding of HTML5, CSS3, responsive design, and cross-browser compatibility.
    • Good grasp of Fullstack performance optimization, including bundle size, rendering, lazy loading, and caching strategies.
    • Working knowledge of Fullstack testing methodologies, unit, integration, and end-to-end (Jest, Cypress, Playwright, or similar).
    • Comfortable working with design systems and shared component libraries.
    • Solid understanding of APIs, RESTful services, GraphQL, and system design fundamentals.
    • Ability to give and receive constructive feedback through code reviews.
    • Good communication skills, able to explain technical decisions clearly to teammates and stakeholders.
    • Bias towards shipping and iteration, you deliver incrementally and learn from real users.
    • Comfortable with ambiguity and rapid change in a fast-paced environment.
    • Thinking in terms of leverage and reuse, not one-off solutions.
    • Pragmatic about trade-offs between perfectionism and speed of delivery.

    Experience

    • 5+ years of professional Fullstack development experience with modern JavaScript/TypeScript.
    • Experience building data-heavy UIs, ideally including real-time data visualization.
    • Experience with state management patterns (Redux, MobX, Zustand, or similar).
    • Experience using AI-assisted development tools (e.g., Claude Code) to boost engineering productivity.
    • Experience contributing to Fullstack architecture decisions on production applications.

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    What we offer

    • Exceptional career growth and learning opportunity.
    • A unique opportunity to be part of an experienced team of industry experts and entrepreneurs who bring massive change to the Adtech market.
    • A fun, driven, and multinational team located across Germany, India, UK, Argentina, Ukraine, Turkey, Spain and many more countries.
    • A flexible work-from-home arrangement.
    • A $500 home office setup budget.
    • A $1000 annual learning and development budget.

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    Topics that you deal with on the job

    Job Locations

    • Location Berlin

      Germany

    This is your employer

    Kayzen

    Kayzen

    Kayzen / Realtime Technologies GmbH is a modern company based in Berlin that provides a mobile demand-side platform for programmatic advertising. This platform helps advertisers execute successful campaigns for acquisition, retargeting, and performance marketing. Kayzen places a strong emphasis on performance, transparency, and control in campaign management, supporting teams from apps, agencies, and brands in their data-driven growth.

    Description

  • Company Type
    Startup
  • Working Model
    Full Remote, Hybrid, Onsite
  • Industry
    Advertising, Marketing, PR
    • Logo Kayzen

    Full Stack Engineer

    Kayzen
    Location
    Berlin
    Working Model
    Full Remote, Hybrid, Onsite
    Diversity
    Open for all genders
    English Only
    English only required

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