About this role.
Ruby Labs is seeking a Lead iOS Engineer to define the technical vision, mentor a team, and drive architecture for consumer products in health, education, and entertainment. The role requires deep expertise in Swift, StoreKit 2, CI/CD, and performance engineering, with a proven track record of scaling B2C subscription apps. You will remain hands-on while setting engineering standards and partnering with product leadership. Ideal candidates have 8+ years of iOS experience and 2+ in a lead capacity. This fully remote position requires availability within ±4 hours of CET.
Role DNA
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Job Complexity
5/5Pace & Pressure
5/5Autonomy Level
5/5Communication Load
5/5Salary analysis
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Core skills
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Cover letter sample
Dear Hiring Manager,
I am thrilled to apply for the Lead iOS Engineer position at Ruby Labs. With over 8 years of iOS development and 3 years leading engineering teams, I have a strong track record of shipping and scaling B2C subscription apps to millions of users. At my previous company, I led the architecture overhaul that improved app startup time by 40% and implemented a modular dependency management system using SPM.
I bring deep expertise in Swift, Swift Concurrency, StoreKit 2, and CI/CD automation. I am passionate about mentoring engineers and fostering a culture of quality through comprehensive testing and performance budgets. I am particularly excited about Ruby Labs' consumer products and the opportunity to drive the iOS platform's technical vision.
Thank you for considering my application. I look forward to discussing how my technical leadership and hands-on experience can contribute to Ruby Labs' success.
Sincerely,
[Your Name]
Sample interview questions
At my last company, our app had a monolithic architecture that caused slow build times and frequent merge conflicts. I proposed modularizing the codebase using SPM, dividing features into independent modules. I considered team structure, dependency management, and future scalability. The outcome was a 50% reduction in build times and faster feature development across teams.
I focus on efficient data caching, lazy loading, and minimizing main thread work. For subscriptions, I use StoreKit 2 with proper receipt validation and handle entitlement changes asynchronously. I also implement performance budgets and use Instruments to monitor memory, CPU, and startup time. Regular load testing helps identify bottlenecks before they affect users.
I balance hands-on coding with mentoring by pairing on complex tasks, conducting code reviews with detailed explanations, and setting clear coding standards. I encourage knowledge sharing through internal tech talks and establish apprenticeship patterns where juniors shadow me on critical features. This ensures growth without compromising delivery.
I set up automated builds and tests using Fastlane integrated with GitHub Actions. The pipeline includes unit, UI, and snapshot tests, with test coverage thresholds enforced. For releases, I use phased rollouts and automated code signing. I also implement crash reporting and performance monitoring to catch issues post-release.
We had a persistent memory leak in a complex animation module. Using Instruments, I traced it to a strong retain cycle in a custom transition delegate. I refactored it to use weak references and moved the delegate to a separate manager. This fixed the leak and improved overall app stability.
About us
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we’re always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/
About the role
As a Lead iOS Engineer, you will own the technical direction of our iOS platform, set engineering standards, and mentor a team of engineers while remaining hands-on with the codebase. You will drive architecture decisions, ensure scalability and performance, and partner with product and cross-functional leadership to shape the mobile roadmap.
Key Responsibilities
Define and own the technical vision, architecture, and long-term roadmap for the iOS platform.
Lead, mentor, and grow a team of iOS engineers; set coding standards and review practices.
Make high-impact architectural decisions and drive modularization/scalability across the codebase.
Own CI/CD strategy, release management, and deployment reliability.
Partner with product and design leadership to translate business goals into technical execution.
Establish observability, performance budgets, and quality gates.
Remain hands-on: contribute to critical features and complex problem-solving.
Qualifications
8+ years of iOS development experience, including 2+ years in a lead or tech-lead capacity.
Proven track record shipping and scaling B2C subscription-based apps at significant user volume.
Deep expertise in Swift, Swift Concurrency, and advanced language features; ability to set idiomatic standards across a team.
Mastery of StoreKit 2, subscription monetization architecture, entitlement/receipt validation at scale, paywall experimentation, and pricing/offer strategy.
Strong architectural leadership: large-scale modular architectures, dependency management (SPM), design systems, and cross-team API contracts.
Experience owning CI/CD at scale (Xcode Cloud, Fastlane, GitHub Actions/Bitrise), automated release trains, phased rollouts, and code-signing automation.
Deep performance engineering: app startup, memory optimization, rendering pipeline, and Instruments-driven diagnosis.
Comprehensive testing strategy ownership: unit, UI, snapshot, and contract testing with meaningful coverage goals.
Experience integrating AI-driven product features and championing AI-assisted development practices across a team.
Strong technical leadership, mentorship, stakeholder communication, and cross-functional collaboration skills.
Location
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.
Benefits
Discover the perks of being part of our vibrant team! We offer:
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!
Interview Process
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:
Recruiter Screening (40 minutes)
Technical Interview (90 minutes)
Technical Interview (60 min)
Final Interview (30 minutes)
Life at Ruby Labs
At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.
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