Mobile iOS Engineer

Flo Health

500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating. 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, we became the first product of our kind to reach a $1B valuation in 2024 – and we’re not slowing down. With 7M 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 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. 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. 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. Your Experience Must have: * 6+ years in software engineering, with at least 3 years focused on building, shipping, and maintaining production mobile applications. * Expert-level iOS development skills, with a proven track record of delivering high-quality apps at scale. * Hands-on experience building complex mobile applications with rich, performant UIs — experience in global consumer-facing products is a strong plus. * Deep proficiency in Swift; working knowledge of Objective-C and solid object-oriented design principles. * Strong familiarity with Apple's ecosystem — frameworks, HIG guidelines, and end-to-end App Store submission and maintenance processes. * Clear understanding of the mobile product lifecycle and comfortable working within Agile teams. * A collaborative, growth-oriented mindset with the drive to take ownership and deliver. Nice to have: * Solid understanding of UX and interaction design principles, with the ability to collaborate effectively with designers and advocate for quality user experiences. * Proven experience optimizing mobile app performance over constrained networks, including building and maintaining offline-first architectures. * Hands-on experience with mobile CI/CD pipelines, including build automation, automated testing, and release workflows. * Experience integrating with BI and analytics platforms, with familiarity in designing and interpreting A/B tests to drive product decisions. What you'll be doing You'll be responsible for: * Building and maintaining features using modern frameworks, libraries, and internal component systems, ensuring consistency, scalability, and code quality across the codebase. * Delivering polished, engaging user experiences that balance visual appeal with intuitive interaction design. * Owning and contributing to a robust Continuous Delivery pipeline, ensuring fast, reliable, and safe releases to production. #LI-Hybrid #LI-AJ1 Annual Salary Range (ranges may vary based on skills and experience) £95,000—£120,000 GBP 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 * In-person collaboration and work in a hybrid model, with 3 days per week spent in the office * 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.

Proton

About Proton  Join Proton and build a better internet where privacy is the default Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives! We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. Our 500+ team members across 50+ countries come from leading organizations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of. Check our open-source projects here! The Role Based in our London office, you’ll join one of several high-impact product teams across Proton Mail, Proton Drive, and Proton Wallet/Payments and Proton Account, helping build privacy-first products used by millions around the world. Whether it’s secure communication, encrypted cloud storage, or the future of private financial tools, you’ll work on technically ambitious products with real-world impact. As a senior engineer, you’ll collaborate closely with product, design, and engineers across Proton to build and ship high-quality experiences on Apple platforms, helping define what “great” looks like for privacy-focused consumer products at scale. What we are looking for * You have extensive experience building and shipping high-quality iOS applications * You care deeply about product quality, usability, and delivering exceptional user experiences * You have strong experience building maintainable, scalable, and testable mobile architectures * You are comfortable working across large codebases and collaborating across multiple teams * You have experience mentoring engineers and raising the technical bar within a team * You have a strong understanding of performance, concurrency, and mobile memory management * You are comfortable navigating ambiguity and contributing to product and technical discussions * Experience with privacy, security, encryption, sync systems, or offline-first architectures is a strong plus * Rust experience is a plus, but not required as we continue moving towards a platform-independent Rust logical core communicating with the iOS application via generic interfaces What We Offer * Work that Matters: millions of people trust Proton with their privacy. We answer only to our users — not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable. (read more about our impact here) * Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we're building. When Proton wins, you win. * Technology: you'll get the right hardware and the right software you need to do your best work. * Learning & Development: we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because you'll be thrown into real challenges, with real ownership, from day one. * Employee Benefits: your wellbeing isn't an afterthought. We offer strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day * In-Person Collaboration: Amazing things happen when passionate, smart, and purposeful people get together in the same room. With offices across Geneva, Zürich, Barcelona, London and more, you'll spend most of your time collaborating face-to-face with people who genuinely care about what they're building * Food: Lunch and snacks are on us every day in our offices so you can focus on the work and not on what's for lunch. * Transport: getting to the office shouldn't cost you. We cover public transport, bike allowances, or parking, whichever works for you. * Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the clock says you started.

Valtech

Head of Mobile Engineering   Why Valtech? We’re the experience innovation company - a trusted partner to the world’s most recognized brands. To our people we offer growth opportunities, a values-driven culture, international careers and the chance to shape the future of experience. The Opportunity: At Valtech, you'll find an environment designed for continuous learning, meaningful impact and professional growth. We're looking for a senior mobile leader to define and evolve our mobile capability in the UK, partnering with clients and multidisciplinary teams to deliver exceptional digital experiences at scale. This role combines technical leadership, consulting, capability development and commercial impact. You will work with some of the world's leading brands to shape mobile strategies, modernise platforms and drive innovation across native and cross-platform ecosystems. The Role: You'll work alongside multidisciplinary teams of architects, engineers, strategists, designers and consultants, helping clients define and deliver world-class mobile experiences. This is both a leadership and hands-on consulting role. You'll provide technical direction, advise clients on platform strategy, support business growth and help build a thriving mobile capability across Valtech. You will operate across strategy, architecture and delivery, bringing together engineering excellence, customer experience and commercial thinking. We operate across sectors including financial services, retail, automotive, healthcare, media and consumer brands. Each presents different technology landscapes, constraints and transformation ambitions. Mobile experiences increasingly sit at the centre of customer engagement. We design scalable, secure and high-performing platforms that enable organisations to deliver connected and intelligent digital experiences. This role will be 60% client strategy & delivery, 40% operational & capability leadership and growth. What Success Looks Like: * A thriving and scalable mobile capability. * Strong technical communities and engineering standards. * Trusted client relationships and strategic influence. * Growth in mobile opportunities and revenue. * High-performing teams delivering exceptional experiences. * Continued innovation across mobile and emerging technologies. Role Responsibilities: Client Delivery Leadership * Act as a trusted advisor to senior client stakeholders. * Provide senior oversight on complex deliveries. Have the awareness to step in early to protect outcomes, people and client relationships. * Be a bridge across disciplines to solve end-to-end problems and create coherent ways of working. * Track and report on the health of the practice. This might include capability coverage (aligned to demand), community engagement, delivery quality, and act on the signals. * Lead workshops and shape mobile transformation roadmaps. * Guide platform modernisation and architecture decisions. * Partner with Product, Design, Data and Engineering teams to deliver integrated solutions. * Influence strategic technology investments. Capability Leadership * Define and evolve Valtech's mobile vision and strategy, and grow our mobile engineering capability. * Have accountability for line management in the practice and line managers will report to you. You will ensure standards and cadence for 1:1s and growth conversations, calibrate performance, manage succession, lead difficult conversations, and coach managers so the whole system gets better. * Coach new leaders. Give them real opportunities and feedback so they lead with consistency, confidence, and care. * Influence our career pathways and skills framework. You will make progression transparent and support through coaching, mentoring, and effective management. * Establish engineering standards and best practices. * Foster communities of practice and mentor engineers and architects. * Sponsor innovation with purpose from small practice experiments to thought leadership (talks, blogs, whitepapers) that help evolve our capability, win new work and influence our clients’ strategy. Technical Leadership * Provide architectural oversight across complex mobile programmes. * Drive approaches across iOS, Android and cross-platform technologies. * Ensure solutions are scalable, secure and resilient. * Champion modern engineering practices including CI/CD, observability and automation. * Explore emerging technologies including AI-enabled experiences and intelligent assistants. Commercial Impact & Growth * Partner with UK Growth teams on pitches and pre-sales work bringing an authentic and credible craft perspective to exec-level conversations backed by real-world experience. * Support UK strategic initiatives, ensuring the practice’s work aligns with wider business priority. * Contribute to proposals and solutioning efforts. * Identify growth opportunities to expand client engagements. * Represent Valtech externally through thought leadership and industry engagement. * Help strengthen Valtech's position as a leader in digital experience and mobile innovation.   Must have Qualifications: Leadership * Experience leading mobile engineering teams, practices or capabilities. * Strong consulting and stakeholder management skills. * Ability to influence senior business and technology leaders. * Passion for coaching and developing talent. Technical Expertise Experience across: * Native mobile development (iOS and/or Android) * Cross-platform technologies such as Flutter or React Native * Mobile architecture and platform strategy * API-driven ecosystems * CI/CD and DevOps practices * Security, identity and authentication * Analytics and observability * Cloud-native platforms and backend integration Consulting Experience * Experience delivering within consulting, agency or digital transformation environments. * Comfortable operating across strategy, architecture and delivery. * Experience leading client engagements and workshops. * Strong communication and presentation skills. * Commercial awareness and experience supporting growth initiatives. Nice to have Qualifications: * Experience with AI-powered mobile experiences and agentic AI. * Knowledge of modern data and personalisation platforms. * Experience leading globally distributed teams. * Public speaking, thought leadership or contributions to the wider technology community. Commitment to reaching all kinds of people We design experiences that work for all kinds of people - and that starts with our own teams. At Valtech, we’re intentional about building an inclusive culture where everyone feels supported to grow, thrive and achieve their goals. No matter your background, you belong here. Explore our Diversity & Inclusion site to see how we’re creating a more equitable Valtech for all.