Senior Android Engineer
Knot
Senior Android Engineer
Knot
B2B fintech API for card updates
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 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.
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 Android Engineer who is energized by performance challenges, deep debugging, and building software that must perform flawlessly in demanding real-world environments. You will help architect and optimize an Android SDK that powers mission-critical experiences for some of the largest FinTechs in the world.
You will work across the entire lifecycle of our Android 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 the design, architecture, and optimization of the Android SDK
Profile and improve memory behavior, garbage collection patterns, CPU usage, allocation behavior, concurrency, and rendering
Design stable public APIs and document them clearly for partner developers
Strengthen test coverage with unit tests, UI automation, integration tests, and performance tests
Co-own the Android CI/CD workflows to ensure reliable and safe releases
Investigate complex production issues and build guardrails to ensure they do not reoccur
Produce thorough documentation that improves integration experience
Represent Android platform considerations during technical planning and reviews
Advocate for integration best practices internally and externally
Promote high standards around clarity, reliability, and engineering craftsmanship
What you’ll need to get the job done
Strong debugging skills with Android profiling tools
Deep understanding of memory management, garbage collection, threading, and CPU analysis
Experience working with asynchronous and multithreaded systems
Ability to design, validate, and document public SDK APIs
Strong testing practices including UI automation
Familiarity with Android CI/CD systems and willingness to help improve them
Comfortable validating releases end to end
Clear communicator and effective collaborator
Experience working with feature flagging and staged rollout strategies
Android Specific Skills
Deep experience with WebView including custom WebViewClient, WebChromeClient, resource handling, messaging, and hybrid debugging
Strong experience with Java for Android development
Experience building and maintaining Android libraries
Familiarity with Gradle build tooling and performance tuning
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)
Knot provides a B2B merchant connectivity API that helps banks, fintechs, and other financial institutions keep customers’ card-on-file details up to date across a broad network of merchants. Its main product, CardSwitcher, automatically updates card information in end-user apps across many merchants with only a few lines of code, and its suite also includes MassSwitcher, TransactionLink, and subscription-management tools; SDKs support web, iOS, Android, React Native, and Flutter. Knot differentiates itself with a developer-first API, wide merchant coverage (including Walmart, Netflix, and Amazon), and revenue-sharing partnerships with major players like Amex Ventures and Plaid. Its goal is to reduce customer churn, grow card adoption, and increase merchant spending for its clients by keeping the user’s preferred payment method current.
Explore more opportunities at Knot