{"id":865976,"url":"https://alion.io/job/knotapi-senior-ios-engineer","title":"Senior iOS Engineer","company":{"id":696073,"name":"Knot API","domain":"knotapi.com","url":"https://alion.io/company/knotapi","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":9,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-11-01T06:10:25Z"}},"role":"Mobile","role_family":"Mobile","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":160000,"max":240000,"currency":"USD","period":"year","gross":null,"usd_annual":240000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Intercom","optional":false},{"name":"iOS SDK","optional":false},{"name":"Swift","optional":false},{"name":"Swift Concurrency","optional":false}],"status":"live","first_seen_at":"2026-01-14T20:18:35Z","employer_posted_date":"2026-01-14","last_verified_at":"2026-11-01T09:34:02Z","board_verified":true,"closed_at":null,"days_open":290,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":290},"description":"About Knot\nKnot’s mission is to empower consumers and businesses alike with connected merchant and banking experiences. Knot is like “Plaid for merchant connectivity.” We are building the platform connecting merchants to the many applications that consumers and businesses interact with everyday. Our flagship CardSwitcher product allows consumers to instantly update & manage their cards on file with online merchant accounts (e.g. Netflix or PayPal), while newer products like TransactionLink support the retrieval of receipt-level transaction data and AgenticShopping enables 1-click, native shopping experiences.\nFounded in 2021, Knot was founded by two brothers and Thiel Fellows - Rory and Kieran O’Reilly - and today powers connected online payment experiences for hundreds of thousands of consumers. Companies like American Express, PayPal, Current, BILT, Step, and more choose to embed Knot’s SDK in their apps to power best-in-class experiences for their customers.\nKnot is proudly backed by a select group of investors, including Nava Ventures, 8VC, American Express, Plaid, and co-founders & CEOs of prominent companies like Twitter, Warby Parker, Allbirds, Casper, Intercom, Deel, Italic, DraftKings, and many more.\nAbout the role\nWe are looking for a Senior iOS Engineer to help shape the architecture, reliability, and performance of our SDK, which powers mission-critical experiences for some of the largest FinTechs in the world.\nYou will work across the entire lifecycle of our iOS SDK, from design to release. This includes shaping how we profile performance, how we catch issues before they ship, how we test our public APIs, and how we produce documentation that makes our SDK easy to integrate. You will collaborate with product and engineering teams across the company, and you will help represent and advocate for our SDK both internally and externally.\nWhat you’ll be doing\nLead and contribute to the architecture, design, and optimization of the iOS SDK\n\nProfile, debug, and improve memory usage, CPU consumption, concurrency, and overall runtime efficiency\n\nDesign stable, predictable public APIs and produce documentation that supports developers integrating our SDK\n\nStrengthen test coverage with unit tests, UI automation, integration testing, and performance testing\n\nCo-own the mobile CI/CD workflows that ensure safe, reliable, and repeatable releases\n\nInvestigate production issues with attention to detail and implement long-term safeguards\n\nAdvocate internally and externally for best practices around integration, performance, and reliability\n\nParticipate in cross-team technical planning and represent the platform’s needs\n\nEvangelize the SDK and help educate teams on its capabilities and usage\n\nContribute to building an engineering culture rooted in clarity, ownership, and thoughtful design\n\nWhat you’ll need to get the job done\nStrong debugging skills and proficiency with native profiling tools\n\nDeep understanding of memory allocation, leaks, CPU usage, and asynchronous patterns\n\nExperience building asynchronous and multithreaded architectures\n\nAbility to design, validate, and document public SDK APIs\n\nStrong unit testing mindset and experience uncovering failure modes and edge cases\n\nFamiliarity with mobile CI/CD pipelines and the desire to improve them\n\nComfortable executing thorough QA validation prior to releases\n\nClear and effective communication with cross-functional teams\n\nExperience writing and debugging UI automation tests\n\nFamiliarity with feature flagging and controlled rollout strategies\n\niOS Specific Skills\nDeep experience with WKWebView including navigation, messaging, resource handling, and hybrid debugging\n\nProficiency with Swift and Swift Concurrency\n\nExperience with ARC, Instruments, and iOS frameworks\n\nExperience building and maintaining frameworks or Swift Packages\n\nFamiliarity with Xcode build tooling and performance optimization\n\nWhat we offer\nInteresting and challenging work\n\nCompetitive base salary + up to 20% annual bonus + generous early employee equity + benefits\n\n100% medical, dental, and vision insurance coverage for you and your dependents (U.S.)\n\nUnlimited PTO\n\nParental leave\n\nBeautiful NYC office in the heart of Flatiron\n\nHerman Miller Aeron desk chair\n\nFood (snacks, frequent lunches & often dinner for those working late)","description_format":"text","description_chars":4324,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Insurance coverage","Parental 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