Fullstack Engineer

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Kayzen

WebsiteLinkedInAll Job Openings

51 - 200 employees

☁️ SaaS

🤝 B2B

💰 $4M Seed Round on 2020-01

Advertising • SaaS • B2B

Kayzen is a leading mobile programmatic advertising company, specializing in providing in-house mobile bidding technology. Built from the ground up, Kayzen empowers advertisers, app developers, agencies, and media buyers to run programmatic campaigns with full transparency and control over data. With solutions tailored for SKAdNetwork, user acquisition, and retargeting, Kayzen offers advanced optimization strategies and insights. Its platform is known for superior data sharing, privacy, and performance, democratizing mobile programmatic marketing by removing the reliance on traditional "black box" service platforms. Kayzen's SaaS solution allows businesses to customize and control their media buying processes, aiming for higher return on ad spend (ROAS).

📋 Description

• 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 • Deliver work reliably within sprint commitments, flagging blockers or scope changes early • Balance new feature delivery with addressing technical debt in the codebase you work on

🎯 Requirements

• 5+ years of professional Fullstack development experience with modern JavaScript/TypeScript • 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 • Experience building data-heavy UIs, ideally including real-time data visualization • Good grasp of Fullstack performance optimization, including bundle size, rendering, lazy loading, and caching strategies • Experience with state management patterns (Redux, MobX, Zustand, or similar) • 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 • Experience using AI-assisted development tools (e.g., Claude Code) to boost engineering productivity

🏖️ Benefits

• 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-dollar home-office setup budget • A 1000-dollar annual learning and development budget