Senior Android Engineer
At a glance
Senior Mobile Engineering role at Knot. New York · full-time · $160,000–$240,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Shape the Android SDK’s architecture, then tune memory use, garbage collection, CPU load, concurrency and rendering
- Create dependable public APIs and explain their use clearly to partner developers
- Expand unit, UI automation, integration and performance tests to catch issues before release
- Share ownership of Android release workflows, investigate production failures and add safeguards against repeat issues
- Guide technical reviews and promote sound SDK integration practices inside and outside the company
What you bring
- Strong Android debugging skills, including hands-on use of profiling tools
- Deep knowledge of memory handling, garbage collection, threading and CPU analysis, plus asynchronous systems
- Substantial Java experience and a track record building and maintaining Android libraries
- Experience with WebView internals and hybrid debugging, along with Gradle build tools and performance tuning
- You can design and document public APIs, build UI automation tests and validate releases from end to end
Who this fits
You’ll suit a senior individual contributor role centered on Android SDK architecture, performance work and complex debugging. The role is based in New York and includes collaboration across product and engineering teams, as well as representing Android SDK needs in technical discussions.
From the employer
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)
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