Senior iOS Engineer – Lead Global Health App UX

Requirements

• 6+ years in software engineering, with at least 3 years focused on building, shipping, and maintaining production mobile applications

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• Expert-level iOS development skills, with a proven track record of delivering high-quality apps at scale

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• Hands-on experience building complex mobile applications with rich, performant UIs — experience in global consumer-facing products is a strong plus

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• Deep proficiency in Swift; working knowledge of Objective-C and solid object-oriented design principles

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• Strong familiarity with Apple’s ecosystem — frameworks, HIG guidelines, and end-to-end App Store submission and maintenance processes

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• Clear understanding of the mobile product lifecycle and comfortable working within Agile teams

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• A collaborative, growth-oriented mindset with the drive to take ownership and deliver

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• (Desirable) Solid understanding of UX and interaction design principles, with the ability to collaborate effectively with designers and advocate for quality user experiences

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• (Desirable) Proven experience optimizing mobile app performance over constrained networks, including building and maintaining offline-first architectures

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• (Desirable) Hands-on experience with mobile CI/CD pipelines, including build automation, automated testing, and release workflows

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• (Desirable) Experience integrating with BI and analytics platforms, with familiarity in designing and interpreting A/B tests to drive product decisions

What the job involves

• As an iOS Engineer at Flo, you’ll help shape the mobile experience for millions of people, and do genuinely meaningful work in women’s health. Our app is trusted by 1 in 4 women aged 18–44 in the US and used across 100+ countries, with machine learning and AI powering accurate cycle predictions and personalised, medically credible health insights

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• We build large-scale mobile applications with rich, intuitive interfaces – optimised for speed, accessibility and privacy. You’ll join a cross-functional team working across the full mobile lifecycle, from feature ideation through to release and iteration, with real ownership over value delivery end to end

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• We’re not a feature factory. Our engineers are pragmatic problem-solvers who thrive in fast-moving environments and care about what they ship. You’ll have genuine scope to experiment, lead ambitious product initiatives and implement solutions that matter – not just clear a backlog. Flo is a constantly evolving product, and we give our engineers the trust and autonomy to evolve it

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• Building and maintaining features using modern frameworks, libraries, and internal component systems, ensuring consistency, scalability, and code quality across the codebase

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• Delivering polished, engaging user experiences that balance visual appeal with intuitive interaction design

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• Owning and contributing to a robust Continuous Delivery pipeline, ensuring fast, reliable, and safe releases to production

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