Full-Time

Senior Frontend Engineer

Posted on 12/10/2025

Knot

Knot

11-50 employees

B2B fintech API for card updates

Compensation Overview

$140k - $200k/yr

+ Bonus + Equity Grants

New York, NY, USA

In Person

Category
Software Engineering (1)
Required Skills
React.js
Figma
Requirements
  • Proficiency in React frontend development with Styled Components.
  • Experience with React Query for API calls.
  • Familiarity with design tools such as Figma and user interface design processes.
  • Experience using or knowledge of Tailwind CSS and UI component libraries (e.g., ShadCN).
  • Experience with AI-native development tools and workflows.
  • Strong visual design skills and attention to detail.
Responsibilities
  • Work alongside a team to build all user-facing surfaces across Knot's products, including the consumer-facing web app, knotapi.com, dashboard.knotapi.com, and other various demo apps.
  • Lead the design direction for and extensively develop dashboard.knotapi.com into a best-in-class dashboard experience.
  • Improve the components and design systems that form the foundation of Knot's frontends with an eye towards ensuring they are prepared for AI-native development.
  • Foster a culture of deep care for industry-leading user experience.
Desired Qualifications
  • Demonstrated track record as a frontend engineer with strong design sensibility.
  • Experience designing and implementing design systems or component libraries.
  • Experience with AI-native development tools and workflows beyond basic familiarity.
  • Experience with dashboard-focused product development or B2B analytics dashboards, large-scale UI projects.

Knot provides a merchant connectivity platform that allows users to automatically update their saved payment card information across various online services. Financial institutions embed Knot’s software into their own apps, enabling customers to swap their old card details for new ones at merchants like Netflix and Amazon without manual entry. Unlike traditional manual updates, Knot uses a developer-first API and a wide merchant network to automate the process and provide item-level transaction data. The company's goal is to help banks increase card usage and reduce customer churn by ensuring their card remains the primary payment method for users.

Company Size

11-50

Company Stage

Series A

Total Funding

$13M

Headquarters

New York City, New York

Founded

2022

Simplify Jobs

Simplify's Take

What believers are saying

  • PayPal partnership launched April 2026 unlocks millions of branded card users for switching.
  • Amex, PayPal, Current, BILT partnerships create sticky revenue-sharing relationships with major institutions.
  • Password updater and account creator tools expand TAM beyond card management into digital onboarding.

What critics are saying

  • Plaid leverages larger network to build competing card-switching, capturing Knot's bank and fintech clients.
  • Amex builds in-house switching using Knot insights, reducing API reliance and terminating revenue-sharing.
  • Tokenization standards from Visa and Mastercard render third-party APIs obsolete within 18-24 months.

What makes Knot unique

  • CardSwitcher automates card-on-file updates across hundreds merchants with minimal developer integration.
  • AccountUpdater enables issuers to push updates without cardholder effort, managing BIN transitions seamlessly.
  • Expanding product suite includes MassSwitcher, subscription cancellation, and account creation tools.

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Benefits

Health Insurance

Dental Insurance

Vision Insurance

Unlimited Paid Time Off

Parental Leave

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

4%

1 year growth

4%

2 year growth

18%
PYMNTS
Apr 7th, 2025
Knot Teams With PayPal to Help Streamline Checkouts

Merchant connectivity platform Knot has launched a checkout-focused partnership with PayPal.

PYMNTS
Apr 7th, 2025
Knot Teams With Paypal To Help Streamline Checkouts

Merchant connectivity platform Knot has launched a checkout-focused partnership with PayPal. The collaboration, announced Monday (April 7), lets PayPal users update their PayPal branded card-on-file information across multiple merchants using Knot’s CardSwitcher technology. “For PayPal users, the process is simple. From the PayPal app, users can log in to their favorite merchants across categories to automatically add their PayPal branded cards to their selected merchants using Knot’s CardSwitcher,” the company said in a news release

Securities.io
Nov 20th, 2024
Knot Launches Accountupdater™: Automatic Card-On-File Updates For Seamless Transactions

New York, New York, November 20th, 2024, FinanceWireKnot, a leading fintech innovator in card-on-file management, introduces Knot AccountUpdater™, an advanced solution designed to upgrade and synchronize card information across hundreds of online merchants instantly and effortlessly.Over the past few years, Knot has been quietly building a suite of merchant connectivity products, and Knot AccountUpdater marks the beginning of rolling out these innovative tools to customers.Knot AccountUpdater enables card issuers using Knot’s CardSwitcher™ product to update cardholder details—including card information, name, address, and phone number—across Knot-connected merchants with a single API call, requiring no effort from the cardholder. Whether it's transitioning users from a debit to a credit card, changing processors, or managing cross-network updates and BIN range transitions, Knot AccountUpdater puts control back in the hands of issuers.“Outdated payment details can disrupt the customer experience and create unnecessary friction for merchants and financial institutions,” said Rory O'Reilly, CEO and co-founder of Knot. “Knot AccountUpdater ensures cards are effortlessly synchronized across merchant platforms, enhancing reliability, boosting loyalty, and driving better outcomes for everyone in the payment ecosystem. Network solutions handle lost, stolen, and reissued cards effectively, and Knot AccountUpdater excels at cross-network updates and managing BIN range transitions.”This solution redefines card-on-file management by focusing on real-time updates through a flexible and scalable design. Its bin-agnostic capabilities make it an ideal solution for issuers of all types, enabling seamless integration without costly overhauls. By integrating with Knot’s merchant connectivity network, Knot AccountUpdater ensures uninterrupted subscription services, online purchases, and recurring payments while simplifying the process for both cardholders and merchants.Knot AccountUpdater is currently being rolled out to select beta customers and merchants, laying the groundwork for future Knot products that will expand on its robust merchant connectivity.Financial institutions can rely on Knot AccountUpdater to minimize payment failures, build customer loyalty, and optimize interchange revenue

Securities.io
Nov 12th, 2024
Knot Unveils Massswitcher™: Instant Card-On-File Updates Across Multiple Merchants

New York, New York, November 12th, 2024, FinanceWireKnot, a leading fintech company specializing in card-on-file management, is proud to announce the launch of MassSwitcher™, an innovative solution that enables cardholders to update their card information across multiple merchant accounts instantly with a single login.MassSwitcher addresses the common challenge consumers face when updating payment details across various online platforms. By leveraging secure integrations with password managers and keychains, cardholders can now manage their card information effortlessly, eliminating the need for manual updates and repetitive logins.“Our mission at Knot is to simplify financial interactions for cardholders, merchants, and financial institutions alike,” said Rory O'Reilly, CEO and co-founder of Knot. “MassSwitcher exemplifies this commitment by providing a seamless, secure, and efficient method for cardholders to manage their payment information across a wide array of merchants.”MassSwitcher is now available to financial institutions, offering a streamlined approach to card-on-file management that enhances user experience and supports uninterrupted transactions across hundreds of online merchants.For more information about MassSwitcher and other Knot products, users can visit https://www.knotapi.com/mass-switcher/.About KnotKnot is a leading fintech company specializing in card-on-file management. Knot offers secure, user-friendly solutions for banks and fintechs to automatically switch saved payment methods at the request of their cardholders. With Knot, card issuers can update card-on-file information instantly and seamlessly, enhancing the customer experience and driving increased interchange revenue from day one.ContactPress TeamKnot PRKnot[email protected]

Bank Automation News
Sep 11th, 2024
Transactions: Amex, Knot launch card-on-file solution

"Amex has integrated with Knot's CardSwitcher technology, which allows eligible card members to quickly and securely provide their payment information to participating merchants directly through the Amex website," Stephanie Schultz, vice president and head [...]

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