# Senior Software Engineer, Cash App Banking

**Company:** [Square](https://hotfix.jobs/companies/square)
**Location:** San Francisco, CA, New York, NY
**Role:** Backend Engineering
**Salary:** $185k – $327k/yr
**Experience:** 6+ years
**Skills:** Java, Kotlin, SQL, Ibatis, Datadog, Splunk, New Relic, GCP, AWS, gRPC, Protocol Buffers, GitHub
**Posted:** 2026-04-30

> Senior Software Engineer building and enhancing the backend tax engine for Cash App Taxes. Translate complex tax rules into scalable, reliable software; collaborate with tax experts and cross-functional teams; mentor others and apply AI-first practices. Requires 6+ years backend experience and strong system design skills.

## Job Description

## You Will
- 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.

## You Have
- 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.

## Technologies We Use and Teach
- 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.)

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**Apply:** https://hotfix.jobs/jobs/053fdeb9-3ba3-4ba7-9348-298088088a2c
**Canonical:** https://hotfix.jobs/jobs/053fdeb9-3ba3-4ba7-9348-298088088a2c