8 months ago
Base Salary
$160k - $240k/yr
Responsibilities
- Lead and contribute to the architecture, design, and optimization of the iOS SDK
- Profile, debug, and improve memory usage, CPU consumption, concurrency, and runtime efficiency
- Design stable public SDK APIs and create integration documentation
- Improve unit, UI automation, integration, and performance test coverage
- Co-own mobile release workflows for safe and repeatable releases
- Investigate production issues and implement long-term safeguards
- Advocate for SDK integration, performance, and reliability best practices
- Participate in cross-team technical planning and represent the platform’s needs
- Evangelize the SDK and educate teams on its capabilities
Requirements
- Strong debugging skills and proficiency with native profiling tools
- Deep understanding of memory allocation, leaks, CPU usage, and asynchronous patterns
- Experience building asynchronous and multithreaded architectures
- Ability to design, validate, and document public SDK APIs
- Strong unit testing mindset and experience uncovering failure modes and edge cases
- Familiarity with mobile CI/CD pipelines and improving them
- Experience with thorough QA validation before releases
- Clear and effective communication with cross-functional teams
- Experience writing and debugging UI automation tests
- Familiarity with feature flagging and controlled rollout strategies
- Deep experience with WKWebView, including navigation, messaging, resource handling, and hybrid debugging
- Proficiency with Swift and Swift Concurrency
- Experience with ARC, Instruments, and iOS frameworks
- Experience building and maintaining frameworks or Swift Packages
- Familiarity with Xcode build tooling and performance optimization
Benefits
- Competitive base salary, annual bonus eligibility up to 20%, equity, and benefits
- 100% medical, dental, and vision insurance coverage for employees and dependents in the U.S.
- Unlimited PTO
- Parental leave
- Beautiful NYC office in Flatiron
- Herman Miller Aeron desk chair
- Snacks and frequent lunches, with dinner often provided for employees working late
Tech Stack
iOSSwift
Categories
MobileTesting
About Knot
Knot builds a merchant connectivity platform and SDK that let banks and fintechs enable card-on-file updates, receipt-level transaction data, and 1-click checkout across hundreds of online merchants. Founded in 2021 and headquartered in New York City, it sells APIs embedded in financial apps; customers cited include American Express, PayPal, BILT, and Step. The company raised a Series A in 2024.