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  2. Flo

Senior/Lead Backend Engineer

Posted on June 26, 2025 (1 day ago)

Job description

About Flo

Flo is the worlds #1 health app on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, it reached a $1B valuation in 2024. With 400M+ downloads and 75M+ monthly users, Flo has 6M paid subscribers and is the highest-rated app in the App Store's health category. Flo focuses on building the next generation of digital health that is AI-powered, privacy-first, and clinically backed.

The job

Build systems that power the #1 Health App for Women. Flo operates at serious scale, with 1 in 4 women aged 184 in the US using the app. The backend engineering team builds data-driven health insights, distributed systems that are fast, available and scalable, privacy-first features like Anonymous Mode, and tooling/platforms to enhance team efficiency. The backend tech stack includes Scala, Java, Python, and other technologies. The team values problem solving, ownership, and continuous learning.

Your Experience

Youl thrive with 7+ years experience building distributed backend systems, expertise in making systems fast, reliable and secure, fluency in Java, Scala, Python or similar, understanding of DevOps, SQL and NoSQL databases, API design skills, clean and documented code writing, and product-mindedness. Bonus skills include stream processing and public cloud infrastructure experience (AWS, GCP).

Whats in it for you?

Joining a senior engineering team working on impactful health, privacy and scale problems. The role offers competitive salary and annual reviews, performance incentives, paid leave including female health leave, enhanced parental leave, accelerated professional growth, flexible office/home working arrangements including up to 2 months work abroad, a 5-week paid sabbatical at 5 years, Flo Premium benefits, and other health, pension and wellbeing perks.

How we work

A mission-led, product-driven team culture valuing fast movement, ownership, debate, shared decisions, craftsmanship, and resilience pursuing better health outcomes.

Diversity, Equity and Inclusion

Flo is an equal opportunity employer focused on merit and skills. They welcome applicants from diverse backgrounds and identities and provide a privacy notice for job applicants.

How to apply

How to Apply

Applications are submitted through the job platform form, which requires candidate information including first and last name, email, phone, location, LinkedIn profile, and uploaded resume/CV and optionally a cover letter. Candidates must confirm full-time residence within Lithuania and acceptance of the company's privacy notice, plus other consents about contact and office commute capability. The role is hybrid with the expectation to commute to the Vilnius office 3 times per week. There is detailed voluntary self-identification information provided for government reporting purposes related to gender, ethnicity, veteran status and disability status. The application process emphasizes candidate confidentiality and equal opportunity policy compliance.