Senior Growth Marketer

cside is a web security company focused on browser intelligence, leveraging AI to detect web threats. The Senior Growth Marketer will own top of funnel strategies, optimize multi-channel marketing campaigns, and drive growth through innovative marketing initiatives.

Responsibilities:

• Draft, implement and improve top of funnel strategies. Get leads flowing!
• Build, optimize, and scale multi-channel marketing campaigns across LinkedIn, Google, TikTok, Reddit, newsletters, and emerging platforms. SEO, SERP, LLM discoverability, Ads
• Own reporting: develop dashboards, run A/B tests, and translate metrics into actionable insights
• Own the tech stack for GTM automation, creating systems that reduce inefficiencies and improve outcomes
• Design, run, and analyze iterative growth experiments across the entire funnel: acquisition, activation, retention, and expansion
• Automate lead scoring, account prioritization, and personalized outreach to maximize conversion rates
• Instrument and maintain our analytics stack (GA4, PostHog, HubSpot, SEMrush, etc.) to provide a single source of truth on performance
• Partner with GTM & Product to launch self-serve onboarding flows and product-led virality loops
• Build automated lifecycle campaigns (email, in-app, Pylon) that convert free customers to paying, retained customers
• Craft technical, value‑first narratives that resonate with security engineers & compliance leads
• Report weekly insights and learnings
• Evaluate and unlock new channels to achieve step-change growth

Requirements:

• 3+ years driving growth for B2B SaaS (security or developer tooling preferred) with a clear track record of pipeline and revenue impact. Ideally a mix of working at larger companies and smaller companies
• You have experience achieving a lot with little. If you managed millions in ad-spend, that will not impress us here
• Experience with tools like Clay, HubSpot, Email delivery, etc
• Ability to evaluate and adopt new tools to maintain a competitive edge
• Analytical to the core and comfortable building dashboards and explaining the 'why' behind the numbers
• Experimentation mindset; you default to hypothesis → test → iterate and openly share wins and failures
• Able to translate complex security concepts into crisp, compelling value propositions for technical buyers
• Thrive in zero-to-one environments; biased toward action, embrace ambiguity, and ship fast without cutting corners
• Exceptional written and verbal communication skills; you write tight copy and influence cross-functional stakeholders
• Genuine passion for web security and belief in cside's mission to protect developers and users
• Fully remote capable with at least 4 hours overlap with UK timezone; excited to travel for 2-3 company offsites per year and if interested in-person conferences