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 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)