Senior Data Engineer (f/m/d)

Adsquare

INTRO At Adsquare, our mission is driven by our core focus: * Passion – Solving complex challenges with great people, tech, and data. * Niche – Location Intelligence for Programmatic Advertisers. Our core values are integral to everything we do: * Drive: We turn ambition into action to deliver valuable outcomes. * Resilience: We adapt, persevere, and grow stronger. * No BS: We value honesty, transparency, and clear communication. * Humble: We choose modesty over vanity and let results speak for themselves. * Moral Compass: We do the right thing with fairness, integrity, and respect. We seek candidates who not only bring top-tier technical expertise but also embody these values in every aspect of their work. ABOUT THE TEAM As a (Senior) Data Engineer at Adsquare, you will be a key contributor to our core engineering function, creating and maintaining scalable big data pipelines that power our applications and drive business value. Because our engineering department handles a variety of critical data challenges, you will be assigned to a specific cross-functional squad based on your individual strengths, experience, and current business needs. To give you an idea of the work, your daily mission might involve: * Data Ingestion & Products: Developing data solutions built on massive volumes of location signals, geospatial (places) data, and audience attribute data. * Data Integrations & Egress: Architecting privacy-first, massive-scale data egress solutions to ensure our datasets reach external partners reliably, securely, and efficiently. Regardless of the specific squad, you will work alongside a talented team of Data and Backend Engineers under the guidance of a Technical Team Lead, operating with a high degree of autonomy and a strong software engineering mindset. YOUR MISSION * Data Pipeline Ownership: Take full accountability for the pipeline lifecycle—from raw data ingestion to transformation and external delivery—according to defined SLAs, time, and budget. * Architect Scalable Solutions: Design and build robust data architectures required to process and transfer terabytes of data. * Pipeline Optimization: Continuously improve data pipelines for cost and performance. This includes analyzing query plans, optimizing compute and working memory, and strategically applying horizontal or vertical scaling. * Engineering Rigor: Elevate data engineering standards. Implement CI/CD workflows, infrastructure-as-code, test-driven development (TDD), and automated testing to ensure reliable and maintainable code. * Data Monitoring: Create and maintain live monitoring dashboards to ensure data solutions are healthy and to support strategic decision-making. * Collaboration & Mentorship: Bridge the gap between Data and Backend engineering. For Senior applicants, act as a technical leader by mentoring junior team members, conducting code reviews, and introducing best practices. YOUR PROFILE We are looking for a candidate with varying levels of experience (mid-level to senior, typically 3-6+ years) in Data Engineering or Backend Development with a heavy data focus. You must be comfortable working in a self-organized, agile environment. Must-Have Technical Skills: * Programming Mastery: Very strong proficiency in Python and SQL. You write modular, production-ready code and possess a solid understanding of both Functional Programming and Object-Oriented Programming (OOP) principles. * Big Data & PySpark: Deep experience with large-scale data processing frameworks, specifically Apache Spark / PySpark. You understand how to handle TB-scale datasets efficiently. Deep understanding of big data file formats like parquet and avro. Experience with open Lakehouse formats like Iceberg. * Advanced Optimization Skills: Proven experience in optimizing data pipelines for compute, working memory, and cost efficiency, including reading and analyzing complex query plans/profiles. * Database & Storage Architecture: Expertise in the trade-offs between OLAP and OLTP systems. You have built solutions using relational and non-relational (NoSQL) databases, and horizontally scalable data warehouses/lakehouses (e.g., Redshift, Snowflake, StarRocks). * Cloud Native (AWS): Experience architecting solutions within the AWS ecosystem (e.g., S3, Athena, Glue, EMR, Lambda, Batch). * Infrastructure & Orchestration: Production experience treating infrastructure as software using Terraform, alongside experience with orchestration tools like Airflow, dbt, or Step Functions. * Engineering Fundamentals: Solid grasp of computer science principles, data structures, algorithms, and git-flow/CI/CD pipelines. * AI tools: Good command of using AI tools (e.g. Claude Code, Kiro, Gemini Pro) to improve and refactor your code, increase your productivity and quality and performance of your code. NICE TO HAVE * Compiled Languages: Experience with a compiled or strongly typed language (e.g., Java, Scala, Go, Kotlin, C++, Cython). * Geospatial Data: Experience working with GIS (Geographic Information Systems) and geo-spatial datasets. * Data Formats: Expertise in optimizing file formats (Parquet, Avro, Iceberg) for performance. * Streaming Technologies: Familiarity with Kafka and Flink. * Backend Context: Experience working closely with Backend engineers or familiarity with Backend architectural patterns (microservices, API design). WHY US? * Hybrid work model * 30 vacation days * Learning budget * Regular team and company events * Latest hardware of your choice * Pet-friendly Berlin office RECRUITING PROCESS COULD REQUIRE ON SITE STEPS For technical roles (Data, Engineering, and Product), candidates are encouraged to upload any technical certifications referenced in their CV via the "Other Documents" section of the application form. Alternatively, certification documents may be submitted after the first technical interview. Any certifications listed on the CV must be provided and successfully validated before proceeding to the second technical interview stage. * Step 1: Short 30-min take-home technical quiz. * Step 2: Value-based interview (30 mins). * Step 3: Deep-dive technical interview (1.5 hours) with the Data team. * Step 4: Practical data-crunching challenge. * Step 5: Team Meet & Greet — the final step to ensure we’re a great fit for each other. WORK MODEL Hybrid in Berlin, Remote for B2B opportunity

GROPYUS

About The Company GROPYUS is a technology-based construction company focused on building multi-story residential buildings. Thanks to its prefabricated building system with various design options, industrial offsite construction, and fully digitalized processes, the company manufactures aspirational, sustainable, and affordable homes using timber construction methods. GROPYUS is using scalable construction and manufacturing solutions to tap into a future market, boost Europe's strength in innovation, while also playing a substantial role in improving sustainability. ABOUT THE ROLE: In this role you’ll work with us to generate the 3D parametric models that power our automated production lines. You’ll help design and improve our Kotlin services, build smart automation flows that react to new data, and tackle fascinating geometry and math challenges along the way. If you enjoy complex problems with real impact, this is the team for you. We believe with the right mindset, curiosity, and enthusiasm, any seasoned Software Engineer, can contribute at GROPYUS, no matter their background. We live pro-active, agile, and test-driven development and value automation not just in CI/CD but in every aspect of work. GROPYUS is the right home for you if you want to build products that profoundly impact people’s lives if you value sustainability and take ownership. WHAT YOU BRING: * Strong Kotlin experience: Professional experience developing with Kotlin. * Cloud-native experience: Hands-on experience deploying and operating applications on Azure, GCP, AWS, or a similar cloud platform. * Experience with PostgreSQL databases. * Previous experience with performance optimizations of algorithms and geometrical 3D challenges. * A plus if you had experience with Rule Engines * A plus if you had experience with Service Bus or other messaging systems. * End-to-end software ownership: Experience designing, building, running, and maintaining production software. * Modern engineering practices: Strong understanding of modern design patterns and experience or interest in pair programming and/or mob programming. * Reliability mindset: Experience with highly available and resilient systems is a plus. * Collaboration & planning: Interest in contributing to team strategy, roadmap definition, and sprint planning is a plus. WHAT WE OFFER: * Be part of something big: You’re here to make a change? Come on board. At GROPYUS, we are on a mission to re-think an entire industry. Join us in reinventing construction and sustainable, affordable living. * It’ s on you: We offer a tremendous amount of ownership and room to make a mark - at all our organization levels. Find your solutions, drive and test them. * Focus on results: You choose if you work from home, a park, or the office. Whether you start your day early, after your run, or pick up on work when your kids are in bed. What counts is your contribution and delivery. * Broaden your horizon: Innovation requires diversity of thought. We are very proud that people from all industries join our company – in addition to core areas such as construction, engineering, and start-ups, from stock-listed companies across automotive, e-Commerce, Digital, sporting goods, and more. You will work in international teams with passionate colleagues. Inspire and be inspired. * Be an owner: Participate in the success of GROPYUS through stock options. JOIN US ON OUR MISSION TO DESIGN BUILDINGS AS CONTINUOUSLY EVOLVING PRODUCTS TO CREATE THE MOST EXCITING AND AFFORDABLE EXPERIENCE FOR ALL. WE BUILD FOR PEOPLE AND CONSERVE THE RESOURCES OF OUR PLANET. WE CAN'T WAIT TO GET TO KNOW YOU.  FOR MORE INFORMATION, VISIT OUR WEBSITE, AND IF YOU HAVE ANY QUESTIONS, PLEASE REACH OUT TO US VIA EMAIL.

Integral

MISSION Hilf uns dabei, vertrauenswürdige Produkterlebnisse zu schaffen, die echte Kundenprobleme in den Bereichen Lohnabrechnung, Steuern und Buchhaltung lösen. Übernimm Verantwortung für echte Ergebnisse, mit dem richtigen Mix aus Geschwindigkeit und Qualitätsanspruch, um nachhaltigen Mehrwert mit modernsten Tools und Methoden zu liefern. Diese Rolle ist hybrid ausgelegt und erfordert mindestens zwei Tage pro Woche in unserem Berliner Büro, um eng mit dem Team zusammenzuarbeiten. DEINE AUFGABEN Was du tun wirst * Design, Aufbau und Wartung unserer Cloud-Infrastruktur mit Fokus auf Zuverlässigkeit, Skalierbarkeit und Sicherheit * Vollständige Verantwortung für unsere CI/CD-Pipelines: vom Design über den Rollout bis zur kontinuierlichen Verbesserung * Einführung und Vorantreiben von Infrastructure-as-Code-Praktiken im gesamten Engineering-Team * Enge Zusammenarbeit mit Product- und AI-Engineers, um schnelle, sichere und häufige Deployments zu ermöglichen * Monitoring der Systemperformance, Leitung von Incident-Response-Prozessen und Durchführung von Post-Mortems * Infrastruktur mit Observability-Tooling instrumentieren: Logs, Metriken, Traces, und entsprechend handeln * Sicherstellung von Sicherheits- und Compliance-Standards in allen Umgebungen * Balance zwischen kurzfristiger Lieferung und langfristigen Architekturinvestitionen * Komplexität reduzieren: Systeme für Entwickler einfach und nachvollziehbar halten Was diese Rolle besonders macht * Hohe Eigenverantwortung: du hast echten Einfluss darauf, wie wir unsere Infrastruktur aufbauen und skalieren * Deine Entscheidungen wirken sich direkt auf die Zuverlässigkeit und Performance einer Plattform aus, die von tausenden KMU in ganz Europa genutzt wird * Enge Feedback-Schleifen mit Engineers, Gründern und Stakeholdern * Pragmatisches Tempo: bauen, lernen, iterieren DEIN PROFIL Erfahrung & Mindset * Mindestens 5 Jahre Erfahrung in DevOps-, SRE- oder Cloud-Infrastruktur-Rollen, idealerweise bei einem Startup oder stark wachsenden Unternehmen * Nachgewiesene Fähigkeit, Infrastruktur von Anfang bis Ende zu verantworten und messbaren Impact zu liefern * Komfortabel mit Ambiguität: du ergreifst die Initiative, managst deine eigene Zeit und hinterlässt Systeme und Teams besser als du sie vorgefunden hast * Du verwandelst Komplexität in Einfachheit, triffst reversible Entscheidungen und erstellst Pläne, denen andere folgen können * Du nutzt KI-Coding-Tools wie Cursor, Copilot oder Claude aktiv und kannst KI-generierten Code prüfen und validieren * Erfahrung in schnell skalierenden Umgebungen ist ein klares Plus * Deutschkenntnisse sind ein klares Plus Fachliche Kenntnisse * Starke Hands-on-Erfahrung mit Cloud-Plattformen (AWS oder GCP bevorzugt) * Containerisierung und Orchestrierung: Docker, Kubernetes * CI/CD-Tooling: GitHub Actions, CircleCI, ArgoCD oder ähnliche * Infrastructure-as-Code: Terraform, Pulumi oder vergleichbare Tools * Observability: Logs, Metriken, Traces, Erfahrung mit SLOs und Incident Response * Security-Grundlagen: AuthN/AuthZ, Secrets Management, Threat Modelling, sichere Coding-Praktiken * Python-Kenntnisse sind ein klares Plus, unsere Engineers arbeiten intensiv mit Python und Claude PROZESS Wir arbeiten schnell, mit den richtigen Kandidat:innen kann der gesamte Prozess in weniger als zwei Wochen abgeschlossen werden. 1. Intro Call mit unserem Talent Team 2. Deep Dive Interview mit unserem CTO & Mitgründer 3. On-site Coding Interview in unserem Berliner Büro mit dem Engineering Team 4. Gründergespräch mit unserem CEO & Mitgründer UNSER ANGEBOT * Überdurchschnittliches Gehalt * Direkter Draht zu den Gründern: kein Filter, keine Warteschlange, kein Komitee * Vollständige Autonomie über das, was du baust; wir messen eingesparte Stunden * Die besten Tools, keine Fragen gestellt: Claude Max, Cursor, OpenAI, was auch immer nächste Woche erscheint * Interne Tools und Ressourcen, die speziell für die Entwicklung agentischer KI im großen Maßstab entwickelt wurden, lies mehr darüber, wie wir arbeiten: engineering.integral.de * 28 Urlaubstage pro Jahr, plus halbe Tage am 24. und 31. Dezember * Urban Sports Club Mitgliedschaft oder Deutschlandticket, deine Wahl * Laptop deiner Wahl: MacBook Pro oder Windows * Betriebliche Altersvorsorge (bAV) * Modernes Büro im Herzen von Berlin Mitte, direkt neben dem Mauerpark * Wöchentliche Teamlunches auf unsere Kosten, Büro-BBQs und ein Dinnerbudget für späte Abende nach 20 Uhr * Ein Team von 50+ (und wachsend!) ambitionierten, diversen Menschen, 20%+ Ex-Gründer, die gemeinsam lernen und aufbauen