Fullstack Engineer (M/F/d) : Berlin, Bangalore, Remote

Hello I am Servesh, Co

- founder and CTO at Kayzen, and I am now looking for a Fullstack Engineer to join our Console team. But wait, you have not heard of Kayzen before?

Kayzen is a mobile demand-side platform (DSP) dedicated to democratizing programmatic advertising. We enable leading apps, agencies, media buyers, and brands to run programmatic customer acquisition, retargeting, and brand performance campaigns through its self-serve and managed service options. Built on the three core pillars of performance, transparency, and control, Kayzen powers the world's best mobile marketing teams with bespoke solutions that fuel business growth and deliver a competitive advantage. With an unprecedented scale of 160B+ daily ad requests from 1.6B+ unique users worldwide, we serve up to 1B+ ads per day in 180 countries. Kayzen is accessible through our APIs and user interface.

The Team

- "The Console" which is the face of Kayzen we are very proud of.
- Complex features which surface a lot of backend infrastructure via console
- Almost 100% uptime with very well planned & executed project management
- Sounds compelling. Isn't it? _

About the Role

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. This role is a strong individual contributor position with room to grow into deeper technical ownership over time.

Responsibilities

- 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

Requirements : Fullstack Technical Excellence (Core Focus) :

- 5+ years of skilled 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

Engineering Maturity :

- 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

Startup Mindset :

- 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

Less About :

- 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.

Nice to Have :

- 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-genera

📌 Fullstack Engineer (M/F/D) (Mumbai)
🏢 Kayzen
📍 Mumbai