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# Senior Software Engineer, Fullstack - All Genders

- **Company:** Doodle
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Java (Programming Language), JavaScript (Programming Language), A/B Testing, Application Programming Interfaces (APIs), Artificial Intelligence, Software Debugging, Performance Tuning, Next.js, Responsive Web Design, TypeScript, Web Application Frameworks, ReactJS, Large Language Models, Backend, Data Layers, Event Driven Architecture, Information Technology, Apache Kafka, Graphql, Front End Software Development, React Redux, Microservices
- **Published:** October 16, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=2265331fa6a65cbc

## About the Role

You'll thrive here if you are a builder who values customer impact as much as clean code, and who is happy to work on anything to reach the goal.

 * The Growth Experience: Proven, hands on experience with growth topics and product experimentation, such as A/B testing, funnel optimization, and activation or conversion work.
 * The AI Mindset: You are AI savvy. LLM and agentic tools are part of how you work every day, and you use them to deliver across the whole stack.
 * The Foundation: A Bachelor's in Computer Science, a related technical field, or equal practical experience.
 * The Toolkit: Professional experience with JavaScript, TypeScript, React.js, and Next.js, and comfort working in older JavaScript and Redux code.
 * The Data Layer: Experience building production ready applications with client side data fetching via GraphQL (Apollo).
 * The Fullstack Mindset: Frontend or fullstack, you are curious beyond your primary area, and you can read, debug, and change code across the stack.
 * The Location: You are based in Germany with full right to work. We cannot sponsor visas or support relocation at this time.

## Description

* Drive Growth: Design, build, and run experiments across the user journey (acquisition, activation, conversion, retention) and turn the results into product decisions.
 * Own the Feature: Take ideas from hypothesis to production, end to end, wherever the work lives in the stack.
 * Ship with AI: Use LLM and agentic tools as your default way of working to move fast, while keeping total ownership and full understanding of the generated code.
 * Build the Frontend: Create fast, accessible, and scalable web applications with React.js, Next.js, and TypeScript.
 * Go Beyond the Frontend: Extend backend services and GraphQL APIs when an experiment needs it, with Apollo Client managing data on the client.
 * Measure What Matters: Instrument features with clean tracking that respects each user's consent choices, so every test produces data the team can trust.
 * Optimize for Speed: Tune performance for speed, scale, and smooth experiences across devices and platforms.
 * Translate the Hard Stuff: Work closely with product managers, UX designers, data analysts, and fellow engineers to turn complex scheduling requirements into clean, elegant solutions., * The Backend Edge: Professional experience building backend services, ideally in Java, and designing GraphQL APIs.
 * The Distributed Layer: Practical experience with microservices and event driven architectures built on Kafka. Go is a plus.
 * The Data Craft: Comfort with experimentation platforms and feature flags such as GrowthBook, tracking plans such as Avo, product analytics, and the statistics behind a sound test.
 * The Billing Side: Experience with subscription billing and payments, ideally Chargebee.
 * The Architecture: A strong architectural mind for component isolation, server side rendering (SSR), and static site generation (SSG) strategies.
 * The Craft: Experience with frontend performance optimization, responsive design, and modern browser APIs.