Senior Frontend Engineer
Posted on November 10, 2025 (about 2 hours ago)
Job Overview
Flo is the world’s #1 health & fitness app worldwide on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, Flo became the first product of its kind to reach a $1B valuation in 2024.
With 6M paid subscribers and the highest-rated experience in the App Store’s health category, Flo has spent 10 years earning trust at scale and is now building the next generation of digital health—AI-powered, privacy-first, clinically backed to help users understand their bodies better.
The Job
Flo is seeking a Senior Frontend Engineer to build the next generation of Flo’s platform and user experiences. The engineer will work on interactive surveys and dynamic content within the Flo app, developing SDKs, reusable components, and internal tools that empower other product teams to deliver exceptional experiences efficiently and reliably.
The frontend stack includes React, TypeScript, and Next.js, with a strong emphasis on performance, maintainability, and testing. Quality is emphasized through TypeScript for type safety, Jest and Playwright for automated testing, and continuous development of the design system and UI kit.
Responsibilities
- Design, build, and maintain high-quality user-facing components and platform SDKs for surveys and interactive experiences.
- Collaborate with product, design, and backend engineers to deliver scalable and flexible solutions.
- Contribute to Flo’s design system and shared UI libraries to ensure consistency and reusability.
- Refactor and improve existing code for better performance, reliability, and maintainability.
- Write clean, modular, well-documented code and advocate engineering best practices.
- Participate actively in Flo’s frontend community to share ideas and drive architectural and development process improvements.
Experience Required
- 7+ years of experience in building, shipping, and maintaining modern web applications.
- Expert knowledge of HTML, CSS, and JavaScript (ES6+).
- Extensive experience with React and modern frontend tooling.
- Proven ability to create adaptive, responsive, and accessible user interfaces.
- Product mindset with strong collaboration skills focused on user impact.
Nice to Have
- Familiarity with Next.js, Contentful, or similar frameworks and CMS solutions.
- Experience with A/B testing and experimentation frameworks.
- Understanding of analytics and business intelligence integrations.
- Exposure to continuous delivery pipelines and web automation tooling.
- Good sense of design and usability.
Work Culture and Benefits
Flo is a mission-led, product-driven team that moves fast, stays focused, and takes ownership. The work culture encourages debate, shared decision-making, and a commitment to craftsmanship and impact. The team is serious about their work and committed to achieving better health outcomes.
- Competitive salary and annual reviews.
- Opportunity to participate in Flo’s performance incentive scheme.
- Paid holiday, sick leave, and female health leave.
- Enhanced parental leave and pay for all types of parents.
- Accelerated professional growth through impactful work and learning support.
- Flexible office and home working, including up to 2 months a year working abroad.
- 5-week fully paid sabbatical at 5-year anniversary.
- Flo Premium for friends and family, plus health, pension, and wellbeing perks.
Diversity, Equity and Inclusion
Flo values differences and hires based on merit and skill with an equal opportunity approach, welcoming applicants from all backgrounds and identities.
How to Apply
To apply for this position, please visit the Flo Health job page and submit your application through the provided form. You will need to fill out required fields including personal information and upload your resume/CV and cover letter if available.
Candidates should be based in Lithuania, within commutable distance to Vilnius, and willing to visit the office occasionally. The office location is Saltoniškių street 2, Vilnius.
Additionally, applicants are asked to confirm their review of the privacy notice for job applicants as part of the application process.