Lead Backend Engineer - Marketing Attribution at Labhouse

Labhouse is a fast-growing startup that builds, launches, and scales its own AI & Productivity Apps, operating under a subscription-based business model. Based in Barcelona, Labhouse was founded by Andrés Bou and Horacio Martos (Co-Founders of SocialPoint). We operate at the intersection of mobile technology, AI, and product-driven growth, with a strong focus on experimentation and performance. Would you like to make an impact as part of a company that builds the best mobile apps used by millions of users worldwide? If so, discover your next challenge below. ABOUT THE ROLE: Marketing attribution is the engine that tells us where every user comes from. Today we rely on a third-party tool (AppsFlyer) to track which campaigns drive installs across our mobile apps — but we believe we can do this better ourselves. As our Lead Backend Engineer for Marketing Attribution, you'll design and build this system from scratch: the infrastructure, the data pipelines, the attribution logic, and the APIs that power it. You'll work autonomously at first, then grow a team around the system you create. This is a high-impact, zero-to-one engineering challenge at the intersection of mobile, backend infrastructure, and data — and it's entirely yours to own. RESPONSABILITIES: - Architect and build a proprietary mobile marketing attribution system from the ground up, replacing AppsFlyer - Design the backend infrastructure to capture, process, and attribute mobile install events at scale - Build reliable, low-latency data pipelines to ingest signals from ad networks, SDKs, and mobile clients - Define the attribution logic and models (last-click, probabilistic, fingerprinting, etc.) that power accurate campaign measurement - Work closely with the Growth and Product teams to ensure the system surfaces the right data for decision-making - Lay the technical foundation with future team growth in mind — your architecture decisions will shape how this team scales ABOUT YOU: Academic background: You hold a degree in Computer Science, Software Engineering, or a related technical field. Strong academic foundations in distributed systems, data engineering, or backend architecture are a plus. Technical expertise: - 7+ years of backend engineering experience, with a strong track record of building complex, high-scale systems - Direct experience with mobile marketing attribution — ideally you've built an attribution system from scratch, or worked deeply within one at a company that built it in-house (as large mobile-first companies often do) - Deep understanding of how mobile attribution works: SKAdNetwork, fingerprinting, device signals, postback systems, ad network integrations - Strong backend fundamentals: API design, distributed systems, event-driven architectures, and high-throughput data processing - Experience working with TypeScript/Node.js is a plus, but we're open to other languages if your backend fundamentals are exceptional — we're still deciding on the stack - Proven ability to work autonomously and make sound technical decisions without heavy oversight - A builder's mindset: you're energized by the blank-page challenge of creating something from zero Problem-solving and product focus: - Excellent problem-solving and analytical skills, with the ability to resolve complex technical challenges. - Eye for detail and a product-first mindset, with a passion for creating exceptional user experiences. - Self-driven, entrepreneurial attitude with the ability to work autonomously and take ownership of projects. Communication: - Good level of spoken and written English, Spanish is a plus - Ability to collaborate effectively with cross-functional teams, including engineering, product, and marketing. NICE TO HAVE: - Prior experience at a mobile-first company or ad tech company where attribution was built in-house - Familiarity with tools in the attribution/MMP ecosystem (AppsFlyer, Adjust, Branch, Kochava) — knowing what they do well (and poorly) helps you build better - Experience with fraud detection in the attribution context (click injection, SDK spoofing, etc.) - Experience hiring or mentoring engineers — you'll be doing this soon WHAT WE OFFER: - Remote work from anywhere in Spain. If you are based in Barcelona, we would love for you to join us at the office (Barcelona Tech City) at least two days a week. - Flexible working hours. - Competitive compensation - High-end equipment for your development. - Permanent contract with competitive compensation. - A young and top entrepreneurial team in a dynamic startup environment. - Opportunity to lead, grow, and take on big challenges. - Work with cutting-edge technologies, including the chance to integrate AI models into new apps. HIRING PROCESS 1. TA Interview – Initial conversation to get to know each other and understand your background. 2. CTO interview – Deep dive into your product thinking, experience, and fit with the team. 3. Technical Case – Practical exercise to assess your product, analytical, and strategic capabilities. 4. Final Interview – Final conversation to ensure alignment on expectations, culture, and role fit. YOU SHOULD KNOW: Labhouse is proud to be an equal-opportunity employer. However you identify or whatever your journey to this point, we welcome all candidates to apply for the position that inspires them. Come join us and help us build a company that everyone is proud to be part of.