Growth Engineer (SEO + Lifecycle)

Arithmos; United Kingdom; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

Arithmos is seeking an experienced growth lead to own programmatic SEO, lifecycle email, and conversion strategies. The role involves expanding targeted SEO pages, executing A/B tests, and optimizing payment experiences.

Ideal candidates have over 4 years in growth for SaaS or fintech products and are comfortable coding with React/Next.js. Join us in shaping the future of direct indexing in the UK.

Qualifications

• 4+ years owning growth at a SaaS or consumer fintech product.
• Strong technical chops — comfortable shipping React/Next.js code yourself.
• Built programmatic-SEO sites that ranked.

Responsibilities

• Expand /locations and /compare to thousands of well-targeted pages.
• Onboarding A/B tests on the help-me modal + roll-the-dice flow.
• Pricing-page experiments and Stripe checkout copy.

Skills

Programmatic SEO

Technical SEO

React/Next.js

SQL

Job description

Run the growth loop — programmatic SEO, lifecycle email, and conversion experiments — end to end.

About Arithmos. Arithmos is building the retail layer for direct indexing. We turn a plain-English idea into a transparent, rule-based portfolio with institutional-grade backtesting and analytics.

The role. You will own the top-of-funnel — programmatic SEO surface (locations, comparisons, blog), lifecycle email + push, signup + paywall conversion, and the experiment infrastructure that lets us learn weekly. Half engineer, half growth lead.

What you’ll do

Programmatic SEO + GEO

• Expand /locations and /compare to thousands of well-targeted pages
• Own the schema.org + llms.txt surface for generative engines
• Run on-page + technical SEO experiments to chart-topping result

Lifecycle + activation

• Email/push/in-app drip — verify-email, first-build, rebalance day
• Onboarding A/B tests on the help-me modal + roll-the-dice flow
• Win-back loops for lapsed Plus subscribers

Conversion + paywall

• Pricing-page experiments and Stripe checkout copy
• Tier-gating UX (locked-range banner, upgrade prompts)

Requirements

• 4+ years owning growth at a SaaS or consumer fintech product
• Strong technical chops — comfortable shipping React/Next.js code yourself
• Built programmatic-SEO sites that ranked
• Numbers-led: comfortable in PostHog / Mixpanel / SQL

Nice to have

• Background in fintech / investing / brokerage
• Worked with Resend, Postiz, or other lifecycle toolingImagine you want to