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Ready to architect the shared AI infrastructure for 12Build as our Senior AI Engineer? Deploy advanced RAG systems & multi-model routing to transform our platform! Job details Apply JOB DESCRIPTION Ready to leverage your engineering skills to build AI services that deliver real customer value? Are you a strategic visionary with a passion for LLMOps, equipped with rock-solid architectural skills, and eager to be the technical anchor of our AI practice? Do you thrive when taking full ownership and leadership in your work? If so, we are looking for you! Your Part of the Adventure We are transforming the way the construction industry operates by integrating GenAI into our platform. As a Senior AI Engineer, you will join the Data Insights team and report directly to the Head of Data. You will be the architect behind the AI capabilities that amplify 12Build's core value. You won’t just build isolated fragments; you will design a shared AI architecture that can be securely utilized by all of our product teams. What does this entail exactly? Hands-on Development: In this role, you will be hands-on responsible for developing an AI service utilized by our product teams. You will write robust code and build from the ground up. AI Features in Production: You will independently deploy critical features into production, ranging from automated data enrichment pipelines to real-time predictive models and advanced RAG systems for our platform features. Architecture & Multi-Model Routing: You will define the standards (such as observability, security, and cost) and implement smart multi-model routing between providers like Gemini and OpenAI. Knowledge Sharing & Tech Lead: You will share your knowledge and mentor your colleagues, though your primary focus remains on shipping high-quality AI features. You will ensure our systems are prepared for tomorrow's scale and lead the way by solving complex technical challenges directly in code. 🎯 Our Mission: "To architect and deploy AI services and capabilities that amplify 12Build’s core value, transitioning from data-informed to AI-driven customer value, and embedding predictive excellence into our platform to solve complex user problems." Sven’s tip for new 12Builders: “Finding your own style and using it to inspire your colleagues is strongly encouraged!” Who is 12Build? With a healthy dose of Drive, Openness and Happiness, we are building a transparent construction sector. We are not only a SaaS platform that connects construction companies and promotes collaboration, we are also the market leader in the Netherlands. We have been around for almost twenty years and we are still growing. Our team now consists of more than 90 colleagues, working together from two offices and various home offices throughout Europe. A large part of the construction world in the Benelux, Germany and Denmark already works on our platform and uses our software on a daily basis. And we have the ambition to conquer the whole of Europe! Our Stack & Tools 🔨 Within our data team, we are continuously expanding our toolkit with the latest AI and cloud technologies. We work with, among other things: AI & LLMOps: Gemini, OpenAI, open-source models, Vector Stores, Prompt Management, and advanced RAG infrastructures. Data Platform & Processing: Databricks, AWS, PySpark, Python, and MySQL. Collaboration & Governance: Linear, Confluence, Slack, and robust CI/CD pipelines embedded with automated AI evaluations. JOB REQUIREMENTS What We Expect from You Experience & Vision: An experienced AI / Software Engineer with a clear, multi-year vision for scaling and industrializing AI infrastructures. This is combined with a minimum of a Bachelor's or Master's degree (HBO/WO) working and thinking level. Tech Skills: Deep experience with Python, Databricks, PySpark, and setting up, orchestrating, and monitoring AI-related services in production environments. Technical Leader: You are decisive in your field and dare to take full technical responsibility. SaaS Experience: A minimum of 5+ years of relevant experience in data or software engineering, preferably within a growing SaaS environment. Cultural Match: You fully resonate with our core cultural values: 💬 You are transparent (Active Honesty) and possess a rock-solid Growth Mindset. 🚀 You are an Ownership Leader with an absolute Commitment to the Craft. 💙 You bring great cultural energy and ensure that colleagues feel valued. What We Offer You 🤝 A starting salary between €5,800 and €6,800 gross per month (based on a senior job level). A 'Lease a Bike' scheme with a €10 monthly employer contribution. A home office allowance for the days you work from home. Free lunch at our office in Nijverdal. 30 vacation days per year. An exciting role within a growing, international SaaS scale-up. Flexible work options (hybrid setup: both from home and the office). Regular team events and ample opportunities for personal and professional development. Choose your own hardware: Windows, Mac, or Linux—everything is possible. Working in an organisation where culture really is number one. Read here how we do that. No towering hierarchical layers. Just a flat organisation with short lines of communication, which makes things easy. You've taken the time to read this text all the way through. That says it all, right? So feel free to apply! Do you have any questions or are you still a little unsure? No problem! Feel free to send an email to Niels (Recruiter, [email protected]).

Ready to leverage your engineering skills to build the ultimate data foundation for our growth from the ground up? Are you ambitious, equipped with rock-solid technical skills, and eager to be the go-to expert for our mission-critical data infrastructure? Do you crave the autonomy and ownership to hands-on build a scalable, future-proof data ecosystem? If so, we are looking for you! 🕵️‍♂️ Your Part of the Adventure We stand on the brink of a massive growth acceleration and are fully data-driven. As a Senior Data Engineer, you will join our Data Insights team and build the foundation upon which the entire company makes its decisions: a robust Medallion Architecture (Bronze/Silver/Gold) and scalable data pipelines that convert raw signals into strategic intelligence. What does this entail exactly? 🔍 Builder & Visionary: You anticipate our scalability needs for the next 12–24 months, but your real focus is leading the charge in setting up, coding, and tuning this infrastructure. You determine the speed and stability of our data flows. Databricks Ownership: You are the owner and primary builder of our data platform, with Databricks serving as the central hub for all our data. You are hands-on with database administration, core pipeline architecture, and performance tuning to lower query execution times. Integrations & Governance: You collaborate directly with the Head of Data to translate vision into stable code, build new API integrations, and seamlessly connect tools like Segment (CDP) to power customer and market segmentation for Sales and CS. You ensure our core platform hits a 99.9% uptime stability while complying with all security and privacy guidelines. Technical Authority: Beyond your steering role, you act as a technical mentor within the team, providing on-the-job support to help junior and medior engineers grow. Foundation for Scaling: Working right in the middle of our company scaling phase, you deliver the rock-solid infrastructure that keeps our rapid growth manageable and profitable. You are a true connector between execution and technology. Sven’s tip for new 12Builders: “Finding your own style and using it to inspire your colleagues is strongly encouraged!” Who is 12Build? With a healthy dose of Drive, Openness and Happiness, we are building a transparent construction sector. We are not only a SaaS platform that connects construction companies and promotes collaboration, we are also the market leader in the Netherlands. We have been around for almost twenty years and we are still growing. Our team now consists of more than 90 colleagues, working together from two offices and various home offices throughout Europe. A large part of the construction world in the Benelux, Germany and Denmark already works on our platform and uses our software on a daily basis. And we have the ambition to conquer the whole of Europe! 🚀 Our Stack & Tools 🔨 Within our data team, we are continuously expanding our toolkit with a world-class data foundation and the latest cloud technologies. We work with, among other things: Data Platform & Core Architecture: Databricks as our central storage and hub, structured according to the Medallion Architecture (Bronze/Silver/Gold). Pipeline Engineering & Tuning: Complex ETL processes, robust pipeline architectures, API wrappers, and advanced performance tuning systems. Customer Data & Analytics: Segment (CDP) as our central source for segmentation and behavioral data. Collaboration: Linear, Confluence, and Slack. JOB REQUIREMENTS What We Expect from You An experienced, hands-on Data Engineer recognized as an expert in mission-critical data infrastructure with a clear vision for scaling platforms. Deep experience with Databricks, pipeline engineering, building API connections, and complex ETL processes. Demonstrated knowledge of database administration, setting up a Medallion Architecture, and extensive performance tuning. A proactive Craft Authority who anticipates scalability issues but loves hands-on building and mentoring colleagues just as much. Analytically minded, flexible, eager to learn, and always up-to-date with the latest industry developments. A minimum of 5 years of experience in data engineering, preferably within a SaaS environment. Cultural Match: You fully resonate with our core cultural values: 💬 You are transparent (Active Honesty) and possess a rock-solid Growth Mindset. 🚀 You are an Ownership Leader with an absolute Commitment to the Craft. 💙 You bring great cultural energy and ensure that colleagues feel valued. What We Offer You 🤝 A starting salary between €5,200 and €6,400 gross per month (based on a senior job level). A 'Lease a Bike' scheme with a €10 monthly employer contribution. A home office allowance for the days you work from home. Free lunch at our office in Nijverdal. 30 vacation days per year. An exciting role within a growing, international SaaS scale-up. Flexible work options (hybrid setup: both from home and the office). Regular team events and ample opportunities for personal and professional development. Choose your own hardware: Windows, Mac, or Linux—everything is possible. Working in an organisation where culture really is number one. Read here how we do that. No towering hierarchical layers. Just a flat organisation with short lines of communication, which makes things easy. You've taken the time to read this text all the way through. That says it all, right? So feel free to apply!