Software Engineer, Access

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 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.

The Role

We're the Access team, and we're building the next generation of authentication and permissions infrastructure for Block. Behind every login and every account there's a platform that needs to be both rock-solid and remarkably flexible.

This isn't about maintaining legacy systems, it's about building the foundation that will enable Cash App and Block's ecosystem to scale while serving increasingly diverse customer needs.

The Challenge: As Block accelerates product innovation, we're seeing an explosion of new use cases: different account capabilities, different authentication requirements, different customer cohorts with different needs. We're building a platform that lets product teams move fast while we maintain the trust and security that our customers depend on.

The Opportunity: You'll be joining at an inflection point. The decisions we make now about architecture, about APIs, about how we enable other teams—will define how Block scales for years to come. This is foundational work with massive leverage.

You Will

• Design and build the APIs and services that power Authentication & Permissions across Cash App and Block's ecosystem, the systems that determine who can access what, and how they prove they are who they say they are. The work is varied and impactful. You might:
  • Build fine-grained permissions systems that enable different roles and capabilities across various account configurations
  • Build secure authentication experiences that protect customers while maintaining seamless access to their accounts
  • Improve account recovery success rates, helping legitimate customers regain access while keeping bad actors out
  • Consolidate authentication platforms, migrating critical flows into scalable, composable services
  • Design authorization primitives that product teams across Block can use to build secure, flexible experiences
• How you'll work: You'll navigate complexity with pragmatism. You'll balance immediate business needs with long-term platform goals. You'll ship iteratively while keeping the big picture in mind. You'll collaborate across product, design, security, and engineering teams. You'll think critically about priorities. You'll adapt and thrive in an environment where priorities shift and requirements evolve.The common thread: you'll be solving complex technical problems that directly impact both customer trust and product velocity. You'll need to balance pragmatism with technical excellence—shipping iteratively while building toward a coherent platform vision.

You Have

• 5+ years building and operating production systems with demonstrated impact and technical ownership
• Ability to think critically and analyze complex problems, weigh trade-offs, and make pragmatic decisions that balance competing priorities
• A bias toward iterative delivery. You know how to break big problems into shippable pieces and maintain momentum through ambiguity
• Comfort with complexity. Whether it's large codebases, distributed systems, or evolving requirements, you don't get overwhelmed; you get strategic
• Excellent communication skills. You can explain technical concepts clearly, build alignment across teams, and adapt your style to different audiences
• Customer empathy. You understand that behind every API call is a person trying to access their money, and that matters
• High technical standards in software testing, delivery, and operational excellence
• Adaptability and resilience. You stay calm and focused when priorities shift or requirements change

Even Better If You Have

• Experience with authentication, authorization, or identity systems
• Experience working in large codebases and breaking apart monoliths
• Background in security, fraud prevention, or trust & safety domains
• Experience building platform or infrastructure that other engineering teams depend on
• Track record working effectively in distributed or remote teams

Technologies We Use and Teach

• Java, Kotlin, Golang
• HTTP, JSON, gRPC, Protocol Buffers
• MySQL, Hibernate, DynamoDB
• Kafka and event-driven architecture
• DataDog, Prometheus
• AWS, Kubernetes

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.

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.