Intern Java Backend Developer Jobs in Windsor, CA

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.

Cash App is offering a better way to file your taxes as an alternative to traditional online DIY tax preparation systems. As a Senior Software Engineer on our Tax Engine Server Engineering team, you will build and enhance the codebase that powers our tax filing experience. You will translate complex tax requirements into seamless software solutions that help millions of users confidently navigate and complete their returns with ease.

You will collaborate closely with product managers, tax experts on our Tax Product Specialist team, and other cross-functional teams to ensure our platform remains accurate, reliable, and easy to use. If you are a skilled engineer who thrives on solving complex problems and wants to make a direct impact on a transformative product within a rapidly growing company, this role is for you.

• Design, build, and own high-quality features and systems that power the Cash App Taxes filing experience, from federal and state form logic to e-file submission.
• Translate complex tax rules and requirements into clean, maintainable, and well-tested code in close partnership with Tax Product Specialists.
• Build tools and guardrails that enable non-technical contributors to make code changes safely that maintain our quality standards.
• Drive architectural and design decisions, ensuring our tax software remains scalable, secure, and maintainable.
• Write reliable, well-tested code and establish best practices for coding, testing, deployment, and documentation.
• Collaborate cross-functionally with Quality Assurance, Tax Product Specialists, Cloud Platform, Design, Product, Customer Care, and other teams to deliver cohesive solutions.
• Proactively identify and resolve issues related to accuracy, reliability, and performance, balancing new feature development with ongoing maintenance.
• Mentor teammates through code reviews, technical discussions, and knowledge sharing, fostering a culture of continuous improvement.
• Stay informed about emerging technologies and industry best practices to continually refine our development processes.
• Apply an AI-first mindset in your everyday work, raising the bar of AI application on our team

• 6+ years of professional software development experience, preferably in a fast-paced or product-centric environment. Experience in the tax industry is a major plus.
• Strong technical skills in backend development, including system design, architecture, and object-oriented programming.
• A track record of delivering reliable, high-quality software solutions on schedule.
• Excellent communication skills with the ability to collaborate effectively with both technical and non-technical stakeholders.
• Strong problem-solving skills with attention to detail and a methodical approach to debugging and implementation.
• A Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent experience).
• Passion for building innovative software that simplifies complicated processes for everyday users.

• Java / Kotlin
• iBatis / SQL Relational Databases
• Logging & monitoring tools - Datadog, Splunk, New Relic
• GCP / AWS
• GitHub
• HTTP, JSON, gRPC, Protocol Buffers
• Okta
• Linear
• AI Coding Agents (Claude, Codex, etc.)

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.