Senior Growth Engineer - Contract Engineering • London • Full time • Hybrid

Department: Engineering

Day rate: Competitive

Length: 3‑month initial contract. Potential to convert to permanent for the right person.

Office Policy: Hybrid with a two core office days per week.

Office Location: London Bridge, London, UK

Opportunity

Lottie's marketplace connects millions of families with the right care at the right time. We have built a platform and now need to grow it faster, smarter, and with more precision. The Senior Growth Engineer will own the full experiment loop—from hypothesis to code to result—and will work closely with Product and Design to run high‑velocity tests, feed signal back to Google to sharpen ad performance, and build 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.

What does this role involve?

• 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

What problems will you be solving?

• Turning traffic into outcomes: closing the gap between families who land on Lottie and those who find the right care.
• Making our ad spend smarter by building pipelines that help Google understand what a good Lottie outcome looks like.
• Moving fast in a space that matters: getting families to the right information faster is a meaningful outcome for real people.

We think you’ll be a great fit if…

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

This role isn’t for you if…

• You prefer depth over breadth and one big build over many small bets
• You need clearly scoped requirements before you can move
• You are looking for a team with lots of process and structure around you
• The mission to transform later life care doesn’t resonate with you

Interview Process

We are keeping this fast and light: candidates could start within a couple of weeks. The process includes:

• Intro call with our Talent Lead (20 min, remote)
• Engineering Manager interview (45 min, remote)
• Technical pairing session (1 hour, remote)

All candidates will be informed of their application status. Pre‑screen and post‑talent screen candidates receive status updates; Engineering Manager interview and technical assessment candidates receive written feedback.

EEO Statement

We want to create an inclusive environment that celebrates the diversity of our people whilst enabling them to do the best work of their careers. We are committed to ensuring that all our people processes are equitable. All applicants will be considered for employment without attention to ethnicity, religion, sexual orientation, gender identity, family or parental status, national origin, veteran, neurodiversity status or disability status. If you require reasonable accommodations during the application or interview process, please let us know.