Staff Software Engineer, Financial Platform Issuing

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 50 million monthly active customers. We want to redefine the worlds 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. Weve 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.

At Block we strive to build the best financial products in the world. The Financial Platform Issuing team owns the card issuing platform that serves every Block brand powering Cash App Card the fourth-largest debit card program in the US alongside Square Card and the new card programs Block launches next.

We run the full lifecycle of a card: issuance fulfillment and activation; real-time transaction authorization and processing across card networks; digital wallet provisioning; 3-D Secure authentication; clearing and settlement; and disputes. When a customer taps their card at a register our systems decide the outcome in milliseconds around the clock in partnership with card networks and bank partners.

As a Staff Software Engineer on the Issuing server engineering team you will bring deep card-network expertise to some of the most complex technical work on our roadmap. You will work alongside technical leads and cross functional teams going deep where our platform meets the networks: specifications protocols certification mandates conformance and production behavior.

This is a hands-on role. You will build systems and tooling debug at the message level and turn your network expertise into durable capabilities that other engineers can use. You will also work directly with the networks themselves not only understanding what they require but knowing where and how to influence outcomes for Block.

• Be a deep technical expert on global card networks helping Issuing teams interpret network specifications message flows certification requirements mandates and production behavior and working directly with the networks to influence requirements resolve ambiguity and secure outcomes that matter for Block.
• Lead complex ambiguous engineering problems at the network boundary that span multiple teams systems or domains.
• Partner with technical leads program DRIs and senior stakeholders to shape solutions where card-network requirements intersect with Blocks issuing platform.
• Stay deeply hands-on: write production code build certification and conformance tooling analyze network messages review designs and code and debug issues down to the protocol and field level.
• Drive network certification and mandatory release cycles end to end and translate network requirements into clear pragmatic engineering decisions.
• Establish shared frameworks standards tooling and practices that make network expertise durable and enable teams to operate independently.
• Raise the technical capability of engineers around you through design guidance code reviews mentorship documentation and clear technical judgment.
• Apply AI-powered tools throughout the engineering lifecycle to improve velocity and quality and help establish effective patterns for broader team use.
• Share operational ownership of critical financial systems through on-call incident response and continuous improvements to reliability and correctness.

• Deep current expertise with at least one major card network ideally Visa including direct connectivity ISO 8583 authorization and clearing flows stand-in processing specifications certification and mandate cycles.
• Personally built certified or operated a live direct network connection not only integrated through a processor.
• Experience working directly with card networks to land concrete outcomes such as rulings exceptions extensions configuration changes defect fixes or certification outcomes.
• Strong hands-on software engineering experience building and operating highly reliable financial or payments systems at scale.
• A track record of leading technically complex ambiguous work across team boundaries and influencing technical direction beyond your immediate area of ownership.
• Experience creating durable technical leverage frameworks standards tooling architecture or practices that other engineers and teams adopt.
• Broad understanding of the card lifecycle with depth in areas such as issuance and fulfillment provisioning and activation authorization ledgering clearing and settlement reconciliation disputes or fraud.
• Working knowledge of Mastercard and American Express alongside deep expertise in at least one major network.
• Fluency with AI-assisted engineering workflows and sound judgment in evaluating and applying AI-generated output.
• Willingness to participate in an on-call rotation for critical financial systems.

Were 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 were doing to build a workplace that is fair and square Check out our ID 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.