We are looking for a Tech Lead (d/f/m) to join a newly assembled team that is part of a new initiative at the heart of our Kleinanzeigen strategy: Give users, who pay to promote their listings, the best possible value and insight. For this to work, we have the exciting challenge to build an intelligent campaign delivery system at a massive scale - an opportunity that is rare to find in Germany. You will own the technical direction from ideation and experimentation through to a production ready service. Your profileYou have designed and implemented scalable, low-latency distributed backend services at Kleinanzeigen's traffic scale You have previously led backend development in cross-functional agile teams Tech Stack:Strong backend engineering skills in Java or Kotlin, with extensive hands-on experience in Spring Boot Proven expertise in building event-driven systems using technologies such as Kafka Strong proficiency designing data models and persistence solutions using SQL and NoSQL databases Your ownership does not end at implementation: You also master deployment (e.g. Github actions), Infrastructure (e.g. Terraform) and Monitoring & Observability (e.g. Grafana) You are able to find the right balance between quality and speed of delivery as well as manage technical debt A growth mindset: you can navigate a system whose architecture is still evolving, make confident decisions under uncertainty, and bring others along Strong communication skills in English. German is a plus. Nice-to-have:Experience with search concepts is a plus (e.g. inverted indices, analyzers, tokenization, and ranking) Understanding of campaign delivery concepts is a plus: campaign lifecycle, impression/click tracking, pacing, auction mechanic, AdTech Data Engineering experience is a plus (Airflow, Databricks, DBT, Python) Provide technical leadership and set the architectural direction for the system, from campaign ingestion through retrieval, auction, and serving Collaborate with the product manager, engineering manager and architect to translate business requirements into sound architecture decisions, with explicit trade-offs and potential migration paths Translate system designs into tangible work streams with estimates and lead the implementation (including hands-on coding) Mentor and grow the engineers on the team by conducting code reviews, setting quality standards, coaching and leading by example Identify and resolve technical bottlenecks, including operational concerns like SLOs and incident response for a new service Participate in agile ceremonies and contribute to shaping the team's ways of working, including optimizing the way to work with AI At Kleinanzeigen, we care about our people — their wellbeing, growth, and life beyond work. Our benefits are designed to support you holistically, giving you flexibility and opportunities to thrive. ✨ Flexibility Flexible working time (hybrid) 20 days “work from anywhere” Paid additional parental leave for both parents Extra paid days off for special occasions (e.g. your wedding or a move) ❤️🩹 Wellbeing & Support Confidential support & coaching for you and your loved ones Annual company sports events Pension and life insurance 📚 Growth & Development Personal development budget Learning opportunities to grow your skills and career 🛍️ Perks & Everyday benefits Corporate benefits and exclusive discounts An attractive referral program Transportation allowance Free shipping on Kleinanzeigen Direktkauf Kleinanzeigen is an equal opportunity employer that values diversity and inclusion. We welcome people of all backgrounds, races, religions, colours, national origins, gender identities, sexual orientation, ages, marital status, or disability. If this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway.