Front-End Engineer (Senior)

We Are Looking

Fleming is seeking a Senior Front-End Engineer to join our growing team. In this role, you’ll be responsible for building modern, scalable, and visually engaging user interfaces for digital health, wellness, and AI-driven platforms. You’ll collaborate with talented designers, product owners, and back-end engineers to deliver exceptional user experiences that impact millions of people worldwide.

This is a great opportunity to take ownership of key front-end initiatives, contribute to architectural decisions, and help shape the future of Fleming’s products in a fast-paced, innovative environment.

Get Ready To

• Develop responsive, accessible, and high-performing web applications using JavaScript, HTML5 and CSS.
• Work extensively with React (Next.js) to build interactive and scalable interfaces.
• Collaborate with cross-functional teams to define and implement product features.
• Optimize applications for speed, scalability, and maintainability.
• Implement and maintain event tracking systems (Google Analytics, Meta Pixel, TikTok Pixel) to ensure reliable marketing and analytics data across funnels and subscription flows.
• Set up front-end monitoring and automated alerting to detect and report outages or broken user flows — reducing the need for manual checks.
• Work on production-grade, zero-downtime platforms used by millions of users.
• Stay involved in MVP-level, business-oriented projects with rapid release cycles.
• Mentor other developers and contribute to knowledge sharing within the team.

We Expect You To

• Have 5+ years of experience in front-end development.
• Be proficient in JavaScript, React and its frameworks.
• Have solid experience with CSS frameworks (e.g. Tailwind CSS), or CSS-in-JS solutions (e.g. styled-components).
• Have a strong understanding of responsive design, cross-browser compatibility, and web performance.
• Have hands-on experience integrating with RESTful API backends.
• Understand event tracking principles and be comfortable implementing custom tracking events in collaboration with growth/marketing teams.
• Be experienced in using error-tracking, monitoring, and testing tools (e.g. Sentry, Playwright) to ensure front-end reliability and uptime.
• Write clean, reusable, and maintainable code following modern development practices.
• Have excellent collaboration and communication skills.
• Be fluent in Lithuanian and English, both written and spoken.

Salary

Gross salary range is 4500-6500 EUR/month. Salary is negotiable depending on experience.

Location

We have an amazing office in the heart of Antakalnis, Vilnius, overlooking the Sapiegos Park, which offers spectacular views in every season.