Retention & Klaviyo Engineer Specialist

Warsaw, Warsaw, Poland

Full Time

Experienced

Location: 100% Remote Position

Happy Mammoth is a fast-growing e-commerce company focused on women’s gut, digestive, and hormonal health. We’re looking for a highly technical Retention & Klaviyo Engineer Specialist to own email, SMS, and lifecycle automations across our global customer base.

What You’ll Do

Build & schedule email and SMS campaigns (build from Figma to Klaviyo)
Create and optimize flows with advanced triggers and logic
Use dynamic variables to pull custom properties from Recharge, Shopify, Rivo, Wonderment, etc.
Manage segmentation and ensure correct entry/exit logic
Monitor and suggest improvements for deliverability
Set up integrations (Zapier, webhooks, app connections)
Support the team with technical troubleshooting and process improvements

Requirements

Expert-level Klaviyo (campaigns, flows, segments, variables)
Strong experience in email/SMS retention, preferably in DTC/e-commerce
Ability to understand customer journey logic and event-triggered automations
Experience with subscription tools (Recharge) and Shopify data
Great attention to detail — nothing goes live without checks
Strong communication and ability to work autonomously

Nice to Have

Basic HTML/CSS for simple pages inside Klaviyo
Knowledge of deliverability tools (e.g., Google Postmaster)
Experience with Zapier, webhooks, Attentive

Why Join Us

Competitive, flexible salary
Paid holidays
Fully remote & flexible schedule
Global, supportive team
Growth opportunities + access to courses and learning resources
Work on a mission-driven brand helping women improve their health

If you’re a technical Klaviyo expert who loves building smart, personalized customer journeys — we’d love to meet you.

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Can you fully implement and schedule an email in Klaviyo based on a Figma design?*

How would you rate your understanding of Klaviyo segmentation logic (inclusions, exclusions, overlaps)?*

Have you built flows using event-based triggers and adjusted flow logic based on customer actions (Recharge, subscription events, cancellations, order behavior)?*

Do you have experience using dynamic variables in Klaviyo to pull custom properties from Shopify, Recharge, Rivo, Wonderment, etc.?*

Can you build and schedule SMS campaigns or flows in Klaviyo or Attentive?*

What Klaviyo task or area did previous teams rely on you as the expert for?*

This is a remote, full-time contractor role. If you are okay with that arrangement please share your expected monthly salary range in USD.*

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Retention & Klaviyo Engineer Specialist

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