Job Overview
Location
London
Job Type
Full-time
Category
Data Science
Date Posted
March 18, 2026
Full Job Description
đź“‹ Description
- • As a Lead CRO Engineer at Fyxer Inc., you will own the end-to-end conversion rate optimisation strategy that directly fuels the company’s explosive growth — from £0 to £30M+ ARR in under two years — by designing, building, and executing data-driven experiments across the full user journey, turning visitor behaviour into measurable revenue impact.
- • You will lead the design, implementation, and analysis of multivariate and A/B tests across landing pages, onboarding flows, activation funnels, and seat expansion mechanisms, using rigorous statistical methods to distinguish signal from noise and drive decisions that improve conversion quality and long-term retention.
- • Day to day, you will build and maintain the experimentation infrastructure — including feature flagging, event tracking, and result interpretation systems — while shipping full-stack features in TypeScript, React, Next.js, and TailwindCSS to optimise conversion touchpoints from first click to paid upgrade.
- • You will collaborate closely with Marketing, Product, and Engineering to align product-side CRO initiatives with paid and organic acquisition channels, ensuring growth loops are tightly integrated across virality, referrals, and upgrade mechanics.
- • You will synthesise quantitative data (product analytics, revenue metrics, cohort trends) with qualitative insights (customer interviews, session recordings, usability feedback) to uncover high-leverage opportunities that others overlook.
- • You will own the strategic direction of Fyxer’s growth engine — defining what to test, why it matters, and how to scale winning experiments — operating with full autonomy in a PM-less, high-ownership environment where your intuition and rigor directly shape company trajectory.
- • You will join a elite, fast-moving Growth Engineering team backed by tier-1 investors (Marc Benioff, Harry Stebbings, David Singleton, Madrona) where intensity, ownership, and technical excellence are rewarded with rapid career acceleration and real impact on a scaling AI product.
- • In this role, you will deepen your expertise in B2B SaaS growth mechanics, statistical experimentation, and AI-integrated product development — gaining rare exposure to how cutting-edge AI companies optimise human-centric workflows at scale — while contributing to a product that saves professionals hours weekly by eliminating email and meeting admin.
🎯 Requirements
- • Proven experience as a CRO, growth, or software engineer with a demonstrable track record of improving conversion rates across sign-up, onboarding, or monetisation flows in B2B SaaS or similar contexts.
- • Proficiency in the Fyxer tech stack: TypeScript, React, Next.js, TailwindCSS, ShadCN, React Query, and serverless functions, with ability to ship production-grade full-stack features.
- • Strong grasp of statistical experimentation — including multivariate testing, significance testing, confidence intervals, and the ability to distinguish statistical from practical significance — applied to real-world product decisions.
- • Deep understanding of B2B SaaS growth loops, including virality, referral systems, seat expansion, and upgrade mechanics, with experience aligning product changes to acquisition funnels.
- • Comfort working with both quantitative data (analytics, revenue, event tracking) and qualitative data (user interviews, session recordings, behavioural observation) to form holistic optimisation hypotheses.
- • Experience with feature flagging, CRM integrations, event tracking pipelines, and segmentation tools as part of a modern growth experimentation stack.
🏖️ Benefits
- • Competitive compensation package of up to £170k/year DOE + equity in a high-growth AI startup backed by Marc Benioff, Harry Stebbings, David Singleton, and Madrona.
- • Hybrid work model: Monday–Thursday in office at Chancery Lane, London, with Friday remote — balancing collaboration with flexibility.
- • Opportunity to work on a pure-play applied AI product (not AI-as-a-feature) that uses fine-tuned open-source models, retrieval-augmented generation, and tool use to eliminate admin burden for professionals.
- • High-ownership, PM-less environment where you drive strategy and execution end-to-end, with direct access to leadership and rapid pathways to senior responsibility.
- • Exposure to cutting-edge growth engineering practices at a company that scaled from $0 to $30M+ ARR in under 18 months — a rare case study in B2B SaaS velocity.
- • Culture of intensity and autonomy: you’re trusted to own problems, experiment boldly, and shape the product’s trajectory without bureaucratic overhead.
Skills & Technologies
JavaScript
TypeScript
React
Next.js
Senior
Onsite
About Fyxer Inc.
Fyxer is a technology company that provides a platform for managing and resolving customer support issues. Their service aims to streamline the customer service process by offering tools for ticket management, communication, and analytics. The platform is designed to help businesses improve their customer support efficiency and customer satisfaction. Fyxer focuses on delivering a user-friendly interface and robust features to handle a wide range of support needs. They cater to businesses looking to optimize their customer service operations and build stronger customer relationships through effective issue resolution and communication strategies. Their goal is to empower businesses with the technology to deliver exceptional support experiences.
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