Senior Backend Engineer - Martech Integrations
Posted on December 10, 2025 (about 4 hours ago)
About the Job
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, it 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 is building the next generation of digital health—AI-powered, privacy-first, clinically backed—to help users understand their bodies better.
Job Description
Build systems that power the #1 Health App for Women. Flo is used by 1 in 4 women aged 18–44 in the US, with record installs and monthly active users. The backend engineering role is core product work, focused on:
- Systems that automate campaign management, creative delivery, and budget allocation.
- Integrations with third-party platforms and APIs for seamless marketing automation.
- Scalable backend systems to maintain reliable campaign operations at large scale.
- Tools that enhance marketing team productivity and reduce manual bottlenecks.
The role welcomes candidates with experience in distributed systems and skills in Scala/Python or similar technologies. Key qualities include problem-solving, ownership, and a continuous learning mindset.
Your Experience
Preferred qualifications include:
- 7+ years experience building distributed backend systems.
- Expertise in making systems fast, reliable, and secure.
- Fluency in Java, Scala, Python, or similar languages, with willingness to learn Scala.
- Proficiency in DevOps, SQL and NoSQL databases, and API design.
- Strong coding practices including clean, documented, version-controlled code.
- Product-minded approach and ownership mentality.
Bonus points for experience in internal marketing tools, campaign automation, creative delivery, or budget management.
What’s in it for you?
Join a senior engineering team focused on impactful campaign automation and marketing technology. The role offers meaningful problem-solving and a cutting-edge approach to marketing.
Work Culture
Flo is a mission-led, product-driven team valuing fast movement, focus, ownership, debate, shared decisions, craftsmanship, and high standards.
Benefits
- Competitive salary and annual reviews
- Participation in Flo’s performance incentive scheme
- Paid holiday, sick leave, and female health leave
- Enhanced parental leave and pay for maternity, paternity, same-sex, and adoptive parents
- Accelerated professional growth with impactful work and learning support
- Flexible office and home working with up to 2 months working abroad
- 5-week paid sabbatical at 5-year anniversary
- Flo Premium for friends & family, plus additional health, pension, and wellbeing perks
Diversity, Equity, and Inclusion
Flo is an equal opportunity employer that values differences and hires based on merit and skill. They welcome applicants from all backgrounds and provide a privacy notice for job applicants.
How to Apply
Applications can be submitted through the job board page on Greenhouse for this position.
Additional Information
The position is only hiring within Lithuania, requiring full-time residency in Lithuania. There is a hybrid work model with up to 2 months per year remote work abroad, and regular commuting to the Vilnius office is expected.