Senior Software Engineer, Optimize/Analyze

Webflow is the agentic web marketing platform for modern marketing teams, helping organizations build, manage, and optimize high-performing web experiences that drive predictable growth and strengthen brand trust. Building at Webflow will need grit, because we move fast, without ever sacrificing craft or quality. We’re looking for a Senior Software Engineer, Optimize/Analyze to help develop and scale Webflow Optimize products. You’ll design high-performance systems that adapt user experiences in real time, working with large-scale data processing and distributed computing to lift conversion and personalization at scale. Our team is fast-moving, data-driven, and experienced in personalization, ML infrastructure, and large-scale analytics. The next chapter is ambitious. We’re serving some of the world’s largest enterprises and rethinking what an AI-native conversion platform can be. This is a cross-team technical role: you’ll work across a large, revenue-generating system, help decide what it needs to become, and partner directly with Engineering, Product, and Design to ship it. About the role: Location: Remote-first (Argentina) Permanent, full-time employee (this is not a contractor position) Application Information: Application deadline: applications accepted on an ongoing basis until position is closed and filled This posting is for a new position. As a Senior Software Engineer on the Optimize team, you'll: Architect, design, and build scalable multi-tenant backend services and APIs for our Optimize product, including our MCP server. Build with MongoDB, Druid, Airflow, AWS (EC2, S3), Python, and TypeScript/Node.js. Define clean service and API boundaries, and design and optimize the MongoDB data models and queries that power recommendations. Improve scalability and reliability through distributed architecture, caching strategies, and event-driven systems tuned for low latency. Lead projects from design through launch that move team and engineering org goals. Write and review maintainable, tested, performant code, and raise the quality bar for the team. Author, collaborate on, and evaluate design documents. Use AI tools in your daily work, and help the team build reliable systems on top of non-deterministic, LLM-backed components. Partner with product engineers, PMs, and designers to ship end to end. About you Requirements: BA/BS degree or equivalent experience Business-level fluency to read, write and speak in English You’ll thrive as a Senior Software Engineer if you: 5+ years building and shipping production backend services, with a track record of performant, high-quality code. Depth in distributed systems: concurrency, asynchronous and eventually consistent processing, queues or streaming, and designing for failure. Strong Python and/or TypeScript/Node.js, plus data modeling experience in MongoDB or a comparable database. Experience with real-time analytics, event-driven architectures, and REST APIs. Hands-on experience with AWS, containers, CI/CD, and observability, and comfort owning infrastructure. Strong production debugging skills across services and layers of the stack. A habit of valuing testing, documentation, and reliability as much as shipping, and communicating trade-offs clearly. Curiosity and a proactive embrace of AI tools to work faster and expand the team’s impact. It would be a bonus if you had even one of the following: Experience with Apache Spark, Airflow, or TensorFlow. Familiarity with Kafka or other event streaming platforms. Prior experience working on large-scale personalization, experimentation, or recommendation systems. Our Core Behaviors Build lasting customer trust. We build trust by taking action that puts customer trust first. Win together. We play to win, and we win as one team. Success at Webflow isn't a solo act. Reinvent ourselves. We don't just improve what exists, we imagine what's possible. Own it all the way. We move fast because the moment demands it, and we hold ourselves accountable to deliver outcomes — for each other, and for customers. Benefits Ownership in what you help build. Every permanent Webflower receives equity (RSUs) in our growing, privately held company. Health coverage that actually covers you. Comprehensive medical, dental, and vision plans for full-time employees and their dependents, with Webflow covering most premiums. Support for every stage of family life. 12 weeks of paid parental leave for all parents and 6+ weeks of additional paid leave for birthing parents. Plus inclusive care for family planning, menopause, and midlife transitions. Time off that’s actually off. Flexible vacation, paid holidays, and a sabbatical program to help you recharge and come back inspired. Wellness for the whole you. Access to mental health resources, therapy and coaching. Invest in your future. A 401(k) with 100% employer match (up to $6,000/year) in the U.S., and support for retirement savings globally. Monthly stipends that flex with your life. Localized su