Senior Software Engineer, Machine Learning

Website Afterpay

It’s all in the app.

About the job
Company Description

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 47 million monthly active customers. We want to redefine the world’s relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We’ve been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

Check out our locations, benefits, and more at

Job Description

Marketplace under Cash App provides different payment products such as BNPL (Buy Now, Pay Later) or pay monthly to customers. The Feature System team belonging to our Machine Learning Architecture organization is responsible for creating generalizable solutions and frameworks in the Machine Learning infrastructure and data space which enable and scale Machine Learning use cases in the Cash App.

As a member of the team, you will design, build and support the feature store and feature engineering pipeline for Marketplace Machine Learning. Also you will have the opportunity to help and establish best approaches to build scalable, iterable and reliable ML solutions and frameworks. We build our services over Cash App’s ever-evolving infrastructure, and as a senior engineer on the team, you will embrace these changes and scale our tech stack to enable future evolvability. This is an exciting opportunity to make a direct, tangible impact on our product and work on projects that are pivotal to the business’s success.

You Will

Design and build self-serving feature platform to handle new products and business requirements that securely scale over millions of users and their transactions
Develop, integrate and optimize end to end feature engineering data pipeline
Partner with ML modelers, data scientists, data analysts and domain engineering teams to identify and execute on new opportunities
Demonstrate rigor in high code quality, good test coverage, and other engineering best practices
Have autonomy to research and achieve outcomes with support when you need it
Contribute to the growth of our development capabilities through leading, mentoring, and supporting fellow engineers
Help build the next generation of machine learning infrastructure and architecture at CashApp
Work in any AU Cash App office location, or work remotely in Australia



You Have

7+ years of backend software development experience in building and maintaining applications in any mainstream language such as: Java, JavaScript, Python, Kotlin, Ruby, Go, Swift, C++
Enthusiastic about solving business problems with technology and can take ownership of an end-to-end solution
Passionate about continuously learning new technologies, frameworks, and services
Possess an execution mindset and the ability to deliver with cross-functional teams that are globally distributed
Serious about testing and have experience with automated testing frameworks
Passion for Cash App’s mission of economic empowerment
Experience of building ML feature engineering data pipeline experience is a bonus
Experience with common technologies, for example, Kafka, Airflow, Spark, Flink, Redis, Cassandra is a bonus
A keen interest in advancing Cash App’s vision of building for economic empowerment


Tools we use and teach

Python, Java, Kotlin
Snowflake, Databricks
Kubernetes, AWS
MySQL, Cassandra DB, DynamoDB
HTTP, JSON, gRPC, Protocol Buffers
Kafka, event-driven microservice architecture


Additional Information

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, based solely on the core competencies required of the role at hand, and without regard to any 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.


We want you to be well and thrive. Our global benefits package includes:

Healthcare coverage
Retirement Plans
Employee Stock Purchase Program
Wellness perks
Paid parental leave
Paid time off
Learning and Development resources


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.

To apply for this job please visit