Kayzen

Fullstack Engineer (m/f/d)

Remote Fullstack Development role with clear candidate location fit.

PostedJul 4, 2026

Eligible countries1 accepted country

Seniority signalSenior

Work settingRemote

Accepted candidate locations

India

Role overview

Readable role content extracted into sections for faster review.

Core responsibilities
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
Hands-on AI Implementation
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
Project & Execution Management
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

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

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

Experience contributing to Fullstack architecture decisions on production applications
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 for 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

Developers who prefer working in isolation on narrowly scoped tickets without engaging with the wider product context. We need someone who wants to understand the "why" behind the work and contribute ideas, not just execute tasks.

Familiarity with ad-tech, real-time bidding platforms, or high-traffic data products
Contributions to open-source Fullstack projects or community involvement
Experience building Fullstack interfaces for AI/ML-powered products (e.g., chatbots, recommendation engines, AI-generated content displays)
Familiarity with LLM APIs and prompt-driven UI patterns

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

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