Senior Growth Engineer - Contract

LottieFiles Inc.

Job Overview

Location

London

Job Type

Full-time

Full Job Description

📋 Description

• We're looking for a Senior Growth Engineer to join a small, focused Marketplace team and own the full experiment loop - from hypothesis to code to result.
• You'll work closely with a PM and designer to run high-velocity tests, feed signal back to Google to sharpen our ad performance, and build the lightweight tooling that lets us learn faster than our competitors.
• This is a role for someone who ships first, learns fast, and doesn't look back.
• If you need things to be perfect before they go live, this probably isn't the right fit.
• Running end-to-end experiments across Lottie's marketplace, from ideation through implementation to result analysis
• Building and optimising conversion-focused front-end experiences, often with limited design input
• Writing code that sends performance data back to Google to improve ad targeting and campaign efficiency
• Automating parts of our Google Ads configuration and campaign management
• Owning A/B test pipelines and iterating quickly based on real usage data
• Working autonomously within a lean, fast team
• Turning traffic into outcomes. Our marketplace is trusted by half a million families a month. You'll be closing the gap between the families who land on Lottie and the ones who find the right care. Every experiment you run is a chance to make that faster, clearer, and more effective.
• Making our ad spend smarter. You'll build the pipelines and integrations that help Google understand what a good Lottie outcome looks like, so our campaigns optimise toward the things that actually matter.
• Moving fast in a space that matters. Care decisions are urgent and emotionally charged. Getting families to the right information faster isn't just a conversion metric. It's a meaningful outcome for real people.

🎯 Requirements

• You have 5+ years of software engineering experience, front-end leaning with genuine full-stack breadth
• You think in experiments. You can articulate what moved because of your work, not just what you built
• You're comfortable with throwaway work. When a test fails, you kill it and move on
• You're autonomous and low-dependency. You thrive with a hypothesis and a deadline, not a detailed spec
• You're data-driven. You define success before you build, and you look at the numbers before you declare a win
• You can start soon and hit the ground running. Contracting experience is a plus, but we're open to people making the move
• AI tools like Claude Code are already a big part of how you work, and you're hungry to get better at them

🏖️ Benefits

• Career Opportunity - A rare chance to own the full growth loop with real autonomy and real impact from day one.
• Early Hire Benefits - Be an early hire at one of the UK’s fastest growing startups and benefit from fast career progression, as well as a generous stock options package.
• Mission - Tech for good that aims to build the care industry of the future and to positively impact millions of peoples lives.
• Investors - Series A backed startup having raised £25m+ from tier 1 venture capital investors including Accel and General Catalyst.
• Global Opportunity & Scalability - Be part of a company that is solving a real tangible problem that every family around the world faces at some point in their life.
• People - Join a kind, talented and mission driven team that loves coming to work every day.
• Culture - Excellent employee compensation/benefits, hybrid office policy and outstanding company culture with a 4.9/5 employee review score on Glassdoor.
• Award Winning - Acclaimed winner of LinkedIn’s 2024 “Top Startups” and named “the UK’s number one startup for 2025” in Startup.co.uk 100 Index.

Skills & Technologies

Senior

Remote

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LottieFiles Inc.

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About LottieFiles Inc.

LottieFiles Inc. provides a cloud-based platform and toolset for motion designers and developers to create, test, collaborate on, and deploy lightweight, scalable Lottie animations across web, iOS, Android, and other digital products. The company offers design plugins, an online editor, asset libraries, version control, hand-off automation, and performance analytics, enabling teams to move motion graphics from After Effects or Figma into production code efficiently while maintaining small file sizes and high visual fidelity.

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