harmonic-security-inc - AI/ML Product Engineer
Requirements
• A track record of shipping production ML that customers or downstream product surfaces depend on, such as text or behaviour classifiers, or clustering and embedding pipelines • Solid applied ML foundations across supervised classification and unsupervised grouping, with a clear view of which model families you've used and why; this role isn't a fit for a background built mainly on forecasting or time-series prediction • Strong production Python for ML and data engineering – code in version control, tested and deployed, not just explored • Rigour about validity: you routinely report precision and recall, confidence intervals and baselines, and you've run experiments or human-in-the-loop review to verify automated conclusions • Experience delivering ML as part of a product team on a customer-visible surface, ideally having owned an insights, analytics or intelligence feature yourself • A quantitative background (statistics, CS, physics, econometrics or equivalent) applied to real data problems • Comfort in a polyglot codebase and a willingness to pick up a second language on the job • Hybrid in our Shoreditch office around two days a week, potential for Remote for exceptional candidates • YOU MIGHT BE A FIT IF YOU • Have built products in cybersecurity, AI detection, data protection, governance or enterprise SaaS – or have a real interest in how organisations adopt AI safely • Have worked on taxonomy design, data labelling, or entity and intent categorisation in a product context • Have been an early or founding engineer or data scientist and defined the product surface yourself • Care whether a signal in the data is real, and will argue about sampling bias and statistical validity when it matters • Have translated messy data into dashboards, scores or narratives that buyers rely on • Want a senior IC seat with build-it-yourself scope, not a step onto a management ladder • Thrive in early-stage ambiguity and prefer small, fast product companies to large platform teams • Leverage AI tools as an engineer to help you build smarter, faster and better
Responsibilities
• Turn raw AI usage data into insights customers can see, trust and act on • Own insight features end to end, from framing the question with users and product partners through to production and iteration • Make sense of unstructured data at scale, with the quality of every output measured and understood • Build and maintain the data pipelines behind your models, and own their deployment and reliability in production • Build the evaluation frameworks, ground-truth sets and error analysis that prove an insight holds up before a customer sees it • Quantify uncertainty and communicate confidence clearly, so the product never presents a shaky signal as a certain one • Shape the product surface itself: what the model should show, to whom, and why • Keep pace with a fast-moving field, adopting new models and approaches as they prove themselves and retiring the ones that don't • Work across a polyglot stack: Python at the core, with Java (Spring Boot) and occasionally TypeScript when the task demands it, deployed on AWS
Benefits
• This isn't just a job - it's a chance to help define a category. Harmonic Security was named to the Rising in Cyber 2026 list, and we're just getting started. We're building at the intersection of AI and security, carving out an emerging market where the rules haven't been written yet, and the people who join now will write them. • We believe today's talent is tomorrow's success, and we're committed to creating an environment where you can do the best work of your life. • Recognized momentum - We made the Rising in Cyber 2026 list, a signal that the market is taking notice • Rare market opportunity - Join early in a category-defining company at the convergence of AI and security, where your work directly shapes how enterprises tackle one of the biggest unsolved problems in tech • Competitive pay and meaningful equity - A real stake in Harmonic's success, not a token gesture • Comprehensive benefits - pension plan and flexible hybrid work • A small, high-trust team that values transparency, creativity, and continuous learning - no politics, no bureaucracy • Thoughtful leadership - that cares deeply about your growth, not just your output • Annual global off-sites - past trips include Lisbon, Portugal and Nashville, TN • Real ownership - you'll shape the product, the culture, and the direction of the company from day one • HARMONIC'S CORE VALUES • 🌱 Flourish in the Unknown • We embrace new, unfamiliar situations that require initiative and rapid decision-making. We orient ourselves quickly and deliver results with minimal guidance. • We raise our hands, take on challenges, and assist others whenever possible. We hunger for opportunities to learn and do more. • 🤝 Perfect Harmony • We support one another to create cohesion and unity. We collaborate openly, share feedback honestly, and help everyone produce their best work
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