Senior Machine Learning Engineer (+ Equity) at early-stage AI security platform

This is a role that TechTree is recruiting for on behalf of one of our clients. TechTree is an AI-driven recruitment platform working with high-growth companies. When you apply, our AI Agent matches you not just to this role, but to other relevant opportunities across our network, so one application can unlock multiple roles. About The Role Join as a Senior Machine Learning Engineer to build production ML systems for detecting disinformation, working with a cross-functional team in a high-ownership role. You’ll be building and operating production-grade machine learning systems that detect and counter disinformation as it happens. This is a high-ownership role where you’ll work across the full ML lifecycle — from model development to deployment and monitoring. What You'll Be Doing Build and operate production-grade machine learning systemsCollaborate with a cross-functional team spanning engineering, machine learning, and intelligence backgroundsShape both the product and the underlying ML infrastructureFocus on real-world systems that are reliable, scalable, and fast What We're Looking For Experience building and deploying machine learning systems in production environmentsStrong engineering fundamentals with clean, modular, maintainable codeEnd-to-end ownership from data and models to deployment, monitoring, and iterationAlgorithmic versatility across ML approachesSolid understanding of both relational and non-relational databasesHands-on experience with containerisation, CI/CD, and production environments Compensation & Benefits £130,000 – £150,000 salary0.25–0.5% early-stage share options25 days holiday + your birthday offPrivate pension contributionsRemote-first with flexible working and an outcomes-driven cultureHigh ownership from day one About The Company We’re building AI systems to help organisations detect and respond to disinformation attacks in real time. Our platform combines machine learning, proprietary knowledge of attack and defence techniques, and experience building large-scale, high-throughput data analysis systems. The founding team brings over forty years of combined experience creating data systems used by national security and commercial organisations. After strong early traction, we’re now accelerating the build-out of the platform. What is TechTree? TechTree combines AI agents with a human support team to give candidates a better, more transparent hiring experience. Our AI Agent gets to know your background, experience, and what you're optimising for. It continuously matches you to live roles across our network where there's genuine alignment, not just keyword overlap. Our Human Team is there to support you through the process: Answer questions about roles, process, and next stepsAdd context when something in your background isn't obviousHelp unblock stalled processes or unclear feedbackMake sure you're not left guessing, ghosted, or wasting time We only post real jobs. Every role on TechTree is a live, active hire. If you apply: you'll be considered for this role, you may also be matched to other relevant roles, and if there's no fit, we won't spam you.