Software Engineer (Backend) Rewards and Reconciliation

BILL•San Jose, CA

About The Position

Join our dynamic Rewards and Reconciliation Squad, where we drive the accuracy and integrity of BILL’s financial operations. As a Software Engineer II, you’ll play a key role in building and enhancing systems that ensure seamless rewards processing and precise reconciliation, directly impacting customer trust and business performance. This is an exciting opportunity to develop your technical skills, collaborate with talented peers, and contribute to innovative solutions in a fast-paced, mission-driven environment.

Requirements

Requires a minimum of 2 years of related experience with a Bachelor's degree; or a Masters degree; or equivalent work experience
2+ years of software development experience building large-scale, complex applications.
Solid understanding of CS fundamentals, including Data Structures, Algorithms, Computer Networking, and Databases.
Proficiency in an object-oriented or functional language, with a strong preference for Elixir.
Strong knowledge of SQL Databases, particularly Postgres.
Demonstrated ability to break down and solve moderately complex technical tasks.
Effective communication skills with the ability to explain technical concepts to diverse audiences.

Nice To Haves

Expertise in using Kubernetes and AWS services to build microservices.
Experience with Flink, Kafka, or other Event-Driven Systems.
Familiarity with observability tools such as Splunk, Datadog, Mixpanel, or LaunchDarkly.
Prior experience in FinTech, banking, or payments.

Responsibilities

Design and build scalable backend services and RESTful APIs that power rewards, billing, and spend workflows, primarily using Elixir.
Analyze and resolve moderately complex technical problems to improve the accuracy of existing financial systems and processes.
Collaborate cross-functionally with product managers and stakeholders to translate complex business needs into high-quality technical solutions.
Write clear, maintainable code and technical documentation to support ongoing system reliability, scalability, and observability.
Deploy and operate microservices in AWS, and managed services to ensure security and efficiency.
Participate in code reviews and advocate for engineering best practices across the software development lifecycle.
Improve service performance and reliability through strong instrumentation, monitoring, and alerting practices (using tools like Splunk or Datadog).