Senior Staff Software Engineer (Backend) - Developer Platform

Innovate with purpose

At BILL, we believe in empowering the businesses that drive our economy. By replacing outdated financial processes with innovative tools, we help businesses—from startups to established brands—make smarter decisions and gain control of their operations. And we don’t stop there: we’re creating the future of financial automation so businesses can spend more time on what matters.

Working here means you become part of a vision-driven team that’s ready to tackle challenges and build cutting-edge solutions. We value purpose, drive, and curiosity—and we thrive in a fast-paced, ever-changing environment. Whether in one of our offices in San Jose, CA, Draper, UT, or working remotely, BILLders collaborate to deliver real impact for businesses that need more time in their busy weeks.

At BILL, we listen, learn, and lead—fostering collaboration and a drive for continuous growth. We’re committed to building a diverse and inclusive workplace that values each person’s unique skills and experiences. Even if you don’t meet every requirement, we’d love to hear from you—you might be just what we’re looking for, whether in this role or another.

✨ Let’s give businesses more time for what matters.

The Developer Platform team is at the ground floor of building the next-gen developer experience at BILL. You will be joining a team of developers who are passionate about APIs, SDKS, and tools that support BILL’s  developer community.  Your role will entail developing, enhancing, and shaping the architecture of API connectivity solutions.

Our mission is to empower developers and our partners with fast, flexible, and performant APIs that enhance user engagement and functionality. Our platform will set the standard for scalability, performance, and ease of integration.

Join Us in Building the Future of Developer Platform! Are you passionate about creating dynamic, high-performance web experiences? Do you thrive on solving complex engineering challenges while building products that scale globally? If you’re ready to build something impactful and work in a fast-paced, collaborative, and forward-thinking environment, we’d love to hear from you!

We’d love to chat if you have:

• A deep appreciation of others' perspectives, excellent communication abilities, and a profound appreciation for the effectiveness of teamwork
• 8+ years experience in designing, developing, and delivering customer centric enterprise level back end solutions
• Proven hands-on skills with programming experience in Java, multi-threading, event driven architectures, REST, Data Caching Services, DB schema design and data access technologies.
• Familiarity with modern web services, APIs and SDKs
• Have understanding of Version control systems, relational databases, entity relationships, Junits, OpenAPI specification, Git/Gitlab.
• A drive and a strong passion for continual learning in the field of engineering, with a particular focus on enhancing developer support capabilities.
• Strong understanding of developer needs and user-centric design principles for APIs.
• Ability to effectively communicate with diverse audiences, from large banking partners to smaller Independent Software Vendors (ISVs) and the broader developer community.
• Proficiency in developing tooling that enhances API usability and developer experience.
• Ability to work in an agile development environment.
• Strong problem-solving skills and attention to detail.
• Excellent communication and teamwork abilities.
• Excellent troubleshooting abilities and energy to be on call for support.
• Experience working on large scale, complex applications 
• Ability to gain alignment across cross-functional boundaries
• Product through all stages of development from concept to launch at scale
• Familiarity and expertise in writing unit and component tests
• Experience in complex problem-solving in large-scale systems, performance optimization, and high-availability systems.
• Promoting a culture of quality 
• Mentoring junior engineers

Good to Have

• Expertise with using AWS services to build microservices
• Experience with Kafka or Event Driven Systems
• Familiar with frontend development with React and Angular
• Experience with tools including Splunk, Datadog, Mixpanel, LaunchDarkly etc.
• Experience in the payments/fintech industry or building payment applications is nice to have

The estimated salary  range for this role is noted below for our San Jose based role.  Our ranges for each role and job level