---
title: 'Senior iOS Engineer at Knot'
canonical: 'https://feeny.ai/job/senior-ios-engineer-knot-new-york-ry832rq70ypx'
type: 'job'
last_seen: '2026-09-12'
---

# Senior iOS Engineer at Knot

- **Company:** Knot
- **Location:** New York, NY
- **Compensation:** $160k–$240k
- **Employment:** full-time
- **Posted:** 2026-01-14
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.ashbyhq.com/knot/fc13c33d-453f-432e-8baf-7595d4e9ac5a

## Job description

## About Knot

Knot’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](https://www.knotapi.com/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](https://www.knotapi.com/tx-link/) support the retrieval of receipt-level transaction data and [AgenticShopping](https://www.knotapi.com/agentic-shopping/) enables 1-click, native shopping experiences. Founded 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. Knot 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.

## About the role

We 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. You 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.

## What you’ll be doing

- Lead and contribute to the architecture, design, and optimization of the iOS SDK
- Profile, debug, and improve memory usage, CPU consumption, concurrency, and overall runtime efficiency
- Design stable, predictable public APIs and produce documentation that supports developers integrating our SDK
- Strengthen test coverage with unit tests, UI automation, integration testing, and performance testing
- Co-own the mobile CI/CD workflows that ensure safe, reliable, and repeatable releases
- Investigate production issues with attention to detail and implement long-term safeguards
- Advocate internally and externally for best practices around integration, performance, and reliability
- Participate in cross-team technical planning and represent the platform’s needs
- Evangelize the SDK and help educate teams on its capabilities and usage
- Contribute to building an engineering culture rooted in clarity, ownership, and thoughtful design

What you’ll need to get the job done

- 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 the desire to improve them
- Comfortable executing thorough QA validation prior to releases
- Clear and effective communication with cross-functional teams
- Experience writing and debugging UI automation tests
- Familiarity with feature flagging and controlled rollout strategies

iOS Specific Skills

- 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

## What we offer

- Interesting and challenging work
- Competitive base salary + up to 20% annual bonus + generous early employee equity + benefits
- 100% medical, dental, and vision insurance coverage for you and your dependents (U.S.)
- Unlimited PTO
- Parental leave
- Beautiful NYC office in the heart of Flatiron
- Herman Miller Aeron desk chair
- Food (snacks, frequent lunches & often dinner for those working late)

## About Knot

## Company Overview
- **One-liner**: Knot builds the first merchant connectivity platform, enabling cardholders to seamlessly update and manage payment methods on-file across hundreds of online merchants.
- **Entity Type**: Private (Series A)
- **Headquarters**: New York, New York, United States
- **Founded**: 2021
- **Founders**: Rory O’Reilly (CEO) and Kieran O’Reilly (CTO)

## Core Business
- **Primary industry**: Merchant connectivity / Fintech infrastructure
- **Target customers**: B2B – major financial institutions, fintechs, and startups that embed Knot’s SDK to power card-on-file switching and merchant account connectivity.
- **Mission / Purpose**: Bridge the gap between consumers’ online accounts and the apps they use every day – “the first merchant connectivity layer for the internet.”

## Products & Services
- **CardSwitcher™**: A product that seamlessly updates payment methods on-file across the internet when a cardholder receives a new card or switches accounts. (API/SDK)
- **TransactionLink™**: A product that extends the merchant connectivity platform, linking transaction data from merchant accounts into the user’s financial app. (API/SDK)

## Market Standing
- **Valuation / Market Cap**: Not publicly available
- **Key Metric**: **Total Funding**: $13.0M across two rounds (Seed in 2021, Series A in 2024)
- **Notable Investors**: Nava Ventures (led Series A), 8VC, American Express, Plaid, and others.
- **Growth Signals**: Reaches **200M+ consumer lives** through its financial brand partners; team of ~32 people with 80% in engineering; 13 active job postings as of mid-2025; expanding merchant coverage to power experiences for brands like Amazon, Netflix, Airbnb, and DoorDash.

## Competitive Advantages
- **First-mover in merchant account connectivity** – most existing solutions only cover banking data.
- **Easy integration** – fits into existing tech stack with “just a few lines of code” and boasts best-in-class uptime.
- **Strong network effects** – each new merchant connection increases platform value for both card issuers and consumers.
- **Backed by industry incumbents** (American Express, Plaid) gives credibility and distribution channels.

## Strategic Focus
- Scale the merchant connectivity platform by adding more merchants and enabling new use cases beyond card switching.
- Deepen relationships with financial institutions and expand into adjacent products (e.g., transaction enrichment, account linking).
- Continue building a “talent-dense,” in-person engineering team in NYC to maintain velocity and quality.

## Why Work Here
- **Culture**: Small, tight-knit team (40 people) with high autonomy and ownership. Values include “extreme ownership,” “speak the truth,” and “level up.” Problems are approached from first principles.
- **In-person collaboration**: **5 days/week in NYC office** – intentional co-location for speed and culture.
- **Compensation**: Strong base salary, 20% performance bonus, and meaningful equity ownership.
- **Perks**: Stocked snacks, catered lunches, optional dinners, Herman Miller chairs, flexible time off (no accrual), and frequent team meals.
- **Engineering-driven**: 80% of the team is in engineering; “no handoffs, no blame, no excuses” – engineers own code from deployment to performance.
- **Hiring process**: Apply → initial coding/technical interview with tech lead → CTO chat → onsite (system design + cross-functional) → fast offer. “Wildcard” role available for versatile contributors.

## Sources
1. [knotapi.com](https://www.knotapi.com/)
2. [knotapi.com/careers](https://www.knotapi.com/careers/)
3. [knotapi.com/careers/engineering](https://www.knotapi.com/careers/engineering/)
4. [linkedin.com/company/knotapi](https://www.linkedin.com/company/knotapi)

## Other roles at Knot

- [Senior Android Engineer](https://feeny.ai/job/senior-android-engineer-knot-new-york-r6y71hb33825) — New York, NY
- [Founding Marketer](https://feeny.ai/job/founding-marketer-knot-new-york-q70edcvpb99t) — New York, NY
- [Account Executive, Enterprise](https://feeny.ai/job/account-executive-enterprise-knot-new-york-y5c4sjajshy5) — New York, NY
- [Account Executive, Banking](https://feeny.ai/job/account-executive-banking-knot-new-york-t60vrxcztm5z) — New York, NY
- [Senior / Staff Infrastructure Engineer](https://feeny.ai/job/senior-staff-infrastructure-engineer-knot-new-york-v8bf34qs5pdn) — New York, NY
- [Chief of Staff](https://feeny.ai/job/chief-of-staff-knot-new-york-jwwfre41bz7j) — New York, NY
- [Lead Solutions Engineer](https://feeny.ai/job/lead-solutions-engineer-knot-new-york-a9n23xq78hjh) — New York, NY
- [Senior Product Manager](https://feeny.ai/job/senior-product-manager-knot-new-york-m9w6v8rb5ph3) — New York, NY
- [Wildcard](https://feeny.ai/job/wildcard-knot-new-york-vycyb96gafyr) — New York, NY
- [Senior / Staff Product Engineer](https://feeny.ai/job/senior-staff-product-engineer-knot-new-york-y7spynt5y68p) — New York, NY