Senior Android Engineer

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)