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Fullstack Engineer (m/f/d)

July 4, 2026

This a Full Remote job, the offer is available from: EMEA

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 team owns the user-facing applications and interfaces that power the Kayzen platform — from our self-serve campaign management dashboard and real-time reporting suite to internal tooling used by our managed service teams. We work closely with product managers, designers, backend engineers, and data teams to deliver seamless, high-performance experiences. We are responsible for some of the most impactful work at Kayzen, including:

“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 interesting. 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 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

Engineering Maturity

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

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-generated content displays)
Familiarity with LLM APIs and prompt-driven UI patterns

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

This offer from "Kayzen" has been enriched by Jobgether.com and got a 77% flex score.

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Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

Just as communication is essential when working remotely, so is organization. Because you won't have those opportunities in the elevator or a casual conversation in the lunchroom, you should take advantage of the little time you have in a video or phone conference...

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...