Senior Software Engineer, Square Financial Services

Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams - People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more - provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.
The Role
Square Financial Services, Inc ("SFS") is Block's bank. The SFS Bank Platform team makes it easy to safely manage, move, reconcile, and understand all of the funds at SFS and with integrated Block products. We build the core system-of-record ledger for the bank, gateways to bank payment networks, and automations for the finance, treasury, and accounting teams. We're building a foundation to support more of Block's products. Come help us build a better bank!
As a Senior Software Engineer on the SFS Bank Platform team, you will lead the technical design, execution, and delivery of new banking primitives through close collaboration across teams and disciplines. In addition, you'll drive architectural decisions and infrastructure improvements to make our systems more robust and scalable. The things that you build will create significant impact at scale and will fundamentally change the consumer banking landscape as we know it today.
You Will

• Design and build new features into our banking platform that meet the diverse needs of Block's broad portfolio of products and services
• Partner with engineering teams across Block to help onboard their products to SFS
• Build systems that operate on our customers' most sensitive data, while holding Square to the highest standards for security and compliance.
• Prioritize correctness and fault-tolerance in your designs so the team can move fast and innovate without putting our customers at risk.
• Utilize AI tools and an AI-first mindset to accelerate development, improve efficiency, and streamline the engineering lifecycle.
• Ensure the continued operation of our critical services, remediate any problems that occur, and design durable fixes so that they don't happen again
• Lead the technical design, execution, and delivery of large-scale features
• Mentor teammates to elevate engineering standards and foster a culture of technical excellence.

You Have

• 6+ years of software development or equivalent experience
• 1+ years of experience leading large scale features, which includes planning, managing and executing on the delivery projects in a timely manner while maintaining a high quality bar
• Hands-on skills building software products or services in the cloud
• A track record of building software that is easy to observe and operate
• A strong sense of customer empathy and a drive to ship software that improves their lives
• Excellent written and verbal communication skills. This is a remote-forward team.
• Experience leveraging AI tools and frameworks to improve developer productivity, code quality, and system efficiency.
• Background in developing financial infrastructure, particularly ledgers or systems-of-record requiring high consistency and correctness
• Proficiency building products and services using AWS
• Proficiency with Kotlin
• Experience building public APIs

Technologies We Use and Teach

• Kotlin/Java, Go
• Temporal.io , Kubernetes, AWS Fargate + ECS
• AWS Aurora and DynamoDB
• Kafka, events, microservices
• Internal and industrywide AI enabling/powering tools
• Protocol Buffers, gRPC, HTTP, OpenAPI, TypeScript, React
• Unit Tests, Continuous Integration, and other methods of quality assurance

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances.
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 .
While there is no specific deadline to apply for this role, U.S. roles are typically open for an average of 55 days before being filled by a successful candidate. Please refer to the date listed at the top of this job page for when this role was first posted.
Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.
To find a location's zone designation, please refer to this resource . If a location of interest is not listed, please speak with a recruiter for additional information.
Zone A:
$217,800 - $326,800 USD
Zone B:
$207,000 - $310,400 USD
Zone C:
$196,100 - $294,100 USD
Zone D:
$185,200 - $277,800 USD
Application Guidelines
Candidates may submit up to 9 active applications within a 60-day period. Reapplications to the same role are accepted 90 days after a previous application has been reviewed.
Use of AI in Our Hiring Process
We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws.
Contact us here with hiring practice or data usage questions.
Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block.
Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we're helping build a financial system that is open to everyone.