We build the best financial products in the world - starting with Cash Cards. Our mission is to make Cash Card the top-of-wallet spending device to our customers by building delightful and differentiated seamless end-to-end experiences across ordering + managing cards and conducting everyday spend.

As a member of the team, you will own the design, implementation and improvement of Cash Card products and features. Not only will you get to ship awesome new products and features, you'll also optimize them to provide the best experience to our customers and maximize their engagement. We build our services over Cash App's ever-evolving infrastructure, and as an engineer on the team, you will embrace these changes and scale our card stack to enable future evolvability.

You will:

• Be object oriented, fearlessly take on new technical challenges and drive deliverables. 

• Build high performance systems that can handle millions of card orders per month.

• Demonstrate rigor in high code quality, good test coverage and other engineering best practices. 

• Work cross-functionally with other engineering teams, design, product, data science and our operations team to design new service features.

• Design fault-tolerant systems with robust observability so the team can iterate quickly and take calculated risks without negative impact reaching our customers

• Build incrementally, test everything, and deploy often

You have:

• 2 or more years of software development or equivalent experience

• Experience building highly scalable, low-latency global systems

• A sense of developer empathy that reflects into the product and feature design.

• A vested interest in advancing Cash App's vision of building for economic empowerment

• Growth mindset and a healthy comfort with ambiguity

• Strong communication skills

• A focus on customer outcomes

Technologies we use and teach

• Kotlin, Java

• Event-driven microservice architecture

• HTTP, JSON, gRPC, Protocol Buffers

• OkHttp, Jetty, JUnit, Guice

• Hibernate, MySQL, Aurora, TiDB, DynamoDB

• SignalFx, DataDog

• AWS Cloud Services

• Kafka and Eventing system

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class. 

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we’re doing to build a workplace that is fair and square? Check out our I+D page. 

Additionally, we consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.

Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services. Made up of Square, Cash App, Spiral, TIDAL, and TBD, we build tools to help more people access the economy. Square helps sellers run and grow their businesses with its integrated ecosystem of commerce solutions, business software, and banking services. With Cash App, anyone can easily send, spend, or invest their money in stocks or Bitcoin. Spiral (formerly Square Crypto) builds and funds free, open-source Bitcoin projects. Artists use TIDAL to help them succeed as entrepreneurs and connect more deeply with fans. TBD is building an open developer platform to make it easier to access Bitcoin and other blockchain technologies without having to go through an institution.