generate cover letter for the following job post:

About Us
Circle is building the world’s leading all-in-one platform for online communities. We make it possible for creators, coaches, educators, and businesses to bring together their audience with engaging discussions, live streams, events, chat, courses, and payments — all in one place, all under their own brand.

We’re proud to be a fully remote company of around 170 (and growing!) team members from 30+ countries around the world. We seek exceptional individuals around the world, set them up to do the best work of their lives, and in turn, create a meaningful impact in their own lives. We don't track hours, but we do manage for high expectations very closely. We collaborate across time zones, are highly async, and like to document a lot.

Twice a year, we bring the whole company together in beautiful places around the world for our company offsites. So far, we’ve hosted offsites in Turkey, Portugal, Mexico, Thailand, Colombia, and Italy, with more to come!

About the role
We’re looking for a Lead Growth Engineer to supercharge our product’s growth by crafting data-driven experiments that directly impact user acquisition, increase MRR, reduce churn, and support all go-to-market functions. Whether you’re optimizing onboarding flows to boost sign-ups, refining billing infrastructure with our payment providers to enhance subscription models, or building internal tools for the sales team, you’ll be at the forefront of our growth strategy. You'll work closely with Sales to identify friction points and improve conversion paths, and with a global team of two senior engineers and a product leader who brings years of experience growing products. This is a hands-on, cross-functional role where you'll drive key decisions, collaborate closely with marketing, sales, and internal teams, and turn insights into impactful actions that help us scale Circle.

This year, our growth team has already driven significant expansion revenue through subscription upgrade paths, enhanced our billing infrastructure to support geographic expansion and new product launches, rebuilt our marketing attribution flows, and redesigned our onboarding experience for our recent Circle 3.0 launch. If this sounds exciting to you, we’d love to chat!

What you'll be doing
Shipping often and with care, balancing speed with thoughtful, quality work.
Leading and mentoring a global team of engineers, driving execution and fostering continuous growth.
Developing and executing data-driven experiments to boost user acquisition, retention, and MRR.
Collaborating across the go-to-market org, aligning with sales and marketing to achieve growth targets.
Rethinking and refining our billing infrastructure to grow MRR and provide pricing transparency to Circle communities
Working on a team obsessed with product-led growth, constantly iterating and pushing boundaries.
Owning end-to-end project management, from concept to execution, for impactful results.
Designing and implementing A/B tests to validate changes and drive measurable improvements.
Analyzing user data proactively to identify growth opportunities and refine the product experience.
Engaging regularly with internal stakeholders to align on growth priorities and initiatives seamlessly.
What you'll need to be successful
Strong alignment with our values. Find our values on our career page if you haven’t read up on them yet.
You are proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5.
You have at least 2 years of experience leading and mentoring engineers, ideally in growth-focused environments.
You have 5+ years of hands-on full-stack development experience, with deep knowledge of Ruby on Rails, React, Sidekiq, Kafka and payment integrations (we heavily use Stripe).
You have a knack for product-led growth and love experimenting with A/B tests, data analysis, and optimization.
You’re great at managing projects end-to-end and thrive on turning ideas into action.
You think strategically but aren’t afraid to roll up your sleeves for tactical work.
You communicate clearly, aligning teams and explaining technical things in a way everyone gets.
You’re a self-starter who takes initiative and enjoys a fast-paced, ever-evolving environment.
You’re data-driven, constantly using insights to validate your next move.
You’re passionate about creating user-centric solutions that drive growth and make a real impact.