Frontend Developer

For our client - a fast-growing AI-driven fitness and wellness product - we are looking for a FrontEnd Developer , a key role in improving user activation and conversion across web and in-app experiences. This role focuses on building and optimising onboarding flows, landing pages, and experiments through A/B testing, working closely with product and design to deliver measurable impact. Responsibilities: - Work with the user activation by running A/B tests on web-onboardings and creating new funnels - Create new landing pages on website - Work with HTML templates inside emails and the mobile application web-view - Participate in requirement analysis, solution design, and implementation phases of the project lifecycle - Analyse requirements and collaborate with team members to produce thoughtful software designs - Code review We expect that you have: - Proven experience as a Web developer (4+ years) - Strong experience developing with React, TypeScript and Next.js - Good knowledge of HTML, CSS - Ability to create readable code - Experience with implementing adaptive web design for mobile and desktop - Ownership mentality - you will work on a critical part of the marketing funnel - Experience in writing unit and e2e tests - we use Vitest and Playwright in our project - Good estimation skills - Fluent English level Beneficial skills: - Experience in creating responsive email templates for major email clients (Gmail, Yahoo, Outlook, Apple Mail) via Sendgrid and Braze - Experience in creating Braze in-app campaigns - Understanding of cloud technologies, proficiency in AWS - Preferably, a degree in Information Technology, Software Engineering, or a related field - Highly interested in a fast-paced software development environment - Enthusiasm for learning and continuous improvement - Passion for Health & Fitness - Work on a fast-growing AI-driven fitness and lifestyle product - AI and LLMs are core not only to the product, but also to day-to-day engineering work - Direct impact on product direction and architectural decisions - Unique intersection of B2C scale and large B2B partnerships - Growth comes from tackling complex technical challenges, deep ownership, and broad influence - Small, people-oriented team with a strong engineering culture We look forward to receiving your CV and learning more about your experience! Dear Candidates, due to a high volume of applications, only selected candidates will be contacted for interviews. We appreciate your understanding. Thank you for considering a career with us! - Work type - Full-time - Location - Warsaw