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Senior Cloud Security Engineer

Vilnius

400M+ downloads. 75M+ monthly users. A decade of building – and we’re still accelerating.

Flo is the world’s #1 health app on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, we became the first product of our kind to reach a $1B valuation in 2024 – and we’re not slowing down.

With 6M paid subscribers and the highest-rated experience in the App Store’s health category, we’ve spent 10 years earning trust at scale. Now, we’re building the next generation of digital health – AI-powered, privacy-first, clinically backed – to help our users know their body better.

The job

We’re not chasing product–market fit. We’ve found it. Flo is used by 1 in 4 women aged 18-44 in the US. Last month alone, 8.6M new installs and a 2.8M user jump. That kind of scale doesn’t just happen. It’s engineered. That’s where you come in.

We’re hiring a Senior Cloud Security Engineer to join Velocity, our internal infrastructure platform team. Velocity exists to make engineering at Flo faster, safer, and more innovative. Your mission? Build a secure systems that empower our product engineers to ship like pros without breaking things.

What Velocity does:

  • Automates everything worth automating
  • Hides complexity behind clean, intuitive tooling
  • Bakes in security and standards so teams don’t have to think twice

What you’ll help build:

  • Distributed systems that handle millions of real-time health interactions
  • Privacy-first features like Anonymous Mode (named in TIME’s Best Inventions)
  • Self-service tools that give teams speed without chaos
  • A stack that scales - fast, available, and secure, always

You’ll thrive here if you:

  • 5+ years of experience within the Infrastructure Security field
  • Security knowledge in Cloud Infrastructure Security
  • Familiarity with containers and container orchestration systems such as Kubernetes
  • Practical experience in Technical Controls, Operational Controls, and Managing Controls within AWS
  • Practical experience with Infrastructure-as-Code tools, specifically Terraform
  • Some experience in building Secure Software Development Lifecycle phases (DevSecOps)
  • Understanding Identity Management principles: SSO, OAuth, JWT, SAML
  • Experience with writing scripts for automation (Python, Bash, or other languages)

Bonus points if you’ve: 

  • Understanding of security monitoring concepts and hands-on experience with event correlation systems (IDS/IPS, SIEM, AWS-specific tools)
  • Familiarity with secret management processes (SSM, 1Password)
  • Knowledge of Zero Trust Architecture and its technical implementations (e.g., Cloudflare)
  • Experience in multi-cloud environments, including AWS and preferably GCP
  • Understanding of business continuity principles (BIA, DRP, MTD/MTPOD, RTO, RPO)
  • Familiarity with disclosure controls (technical, operational, and management controls)

What’s in it for you:

  • Drive tangible impact by collaborating with security and engineering teams to strengthen cloud security posture
  • Gain hands-on experience implementing and supporting leading cloud security tools like AWS GuardDuty, Inspector, Security Hub, and Elastic Cloud Security.
  • Lead improvements in CI/CD security by enhancing infrastructure gating
  • Develop and operate Cloudflare security features, including Web Application Firewall (WAF) and bot mitigation strategies
  • Advance container security by championing initiatives like golden images and secure baselines
  • Build visibility into security performance by measuring and visualising scores with tools like Databricks Dashboards or Looker
  • Work within a high-performing cloud infrastructure team that prioritises security, reliability, and collaboration
  • Shape the company’s broader security culture through proactive engagement and thought leadership

You're not just keeping the lights on. You're building the grid. If that sounds like your kind of challenge, let's talk.

#LI-Hybrid #LI-L#LI-Hybrid #LI-L

Salary Range - gross per month (ranges may vary based on skills and experience)

€6.000 - €10.000 EUR

How we work

We’re a mission-led, product-driven team. We move fast, stay focused and take ownership – from brief to build to impact. Debate is encouraged. Decisions are shared. We care about craft, ship with purpose, and always raise the bar.

You’ll be working with people who take their work seriously, not themselves. It takes commitment, resilience, and the drive to keep going when things get tough. Because better health outcomes are worth it. 

What you'll get

We support impact with meaningful reward. Here’s what that looks like:

  • 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 maternity, paternity, same-sex and adoptive parents
  • Accelerated professional growth through world-changing work and learning support
  • Flexible office + home working, up to 2 months a year working abroad
  • 5-week fully paid sabbatical at 5-year Floversary
  • Flo Premium for friends & family, plus more health, pension and wellbeing perks

Diversity, equity and inclusion

Our strength is in our differences. At Flo, hiring is based on merit, skill and what you bring to the role – nothing else. We’re proud to be an equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.

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