Backend Software Engineer

About the role

About The Company

Three+One® is a leading provider of liquidity and treasury solutions tailored for public entities such as municipalities, counties, school districts, authorities, higher education institutions, and nonprofit organizations. Our mission is to simplify cash management, banking, and investment decisions by serving as a trusted liquidity data partner. We empower our clients to make data-driven financial choices, uncover new income streams, and optimize cash utilization. Our innovative technology platform includes tools like cashVest®, a liquidity monitoring and forecasting system; rfpPrep®, a digital procurement tool for banking and investment services; and muniBank, a banking fee benchmarking solution. With additional tools in development, three+one continues to enhance public sector financial management, leading to increased earnings and confidence in cash investments. Our work consistently results in an average of 30% more earnings and 73% more cash being invested confidently, helping public entities maximize their financial resources efficiently.

About The Role

We are seeking a motivated and experienced Backend Software Engineer to join our dynamic team and contribute to the growth of one of the nation's fastest-growing public sector fintech firms. In this role, you will be responsible for designing, developing, and maintaining scalable backend services and APIs that support our suite of financial tools. You will work with complex financial and transactional data pipelines, ensuring high accuracy and performance. This position offers the opportunity to work remotely, with occasional travel expected up to 5%. Reporting directly to the Chief Product and Technology Officer, you will collaborate closely with cross-functional teams including product managers, designers, and other engineers. The ideal candidate is goal-oriented, enjoys working with data-intensive applications, and is eager to grow into more advanced system design and architectural responsibilities over time.

Qualifications

Bachelor’s degree in Computer Science, Software Engineering, or related field.

Minimum of 5 years of progressive software engineering experience.

Proficiency in Python programming language.

Experience building and maintaining APIs.

Familiarity with React, modern JavaScript/TypeScript, and contributing to UI features.

Experience working with relational databases and version control systems such as Git.

Knowledge of CI/CD workflows and cloud platforms like AWS, GCP, or similar.

Understanding of containerization basics.

Background in FinTech, banking, or financial systems.

Experience with data processing, ETL workflows, and analytics/reporting systems.

Familiarity with infrastructure-as-code tools.

Exceptional attention to detail, strong time management, and ability to handle multiple priorities independently.

Growth mindset, receptive to feedback, and eager to learn and adapt.

Responsibilities

Design, develop, and maintain scalable APIs and backend services to support our financial tools.

Work with financial and transactional data pipelines, ensuring data accuracy and system performance.

Enhance system reliability, observability, and overall performance metrics.

Contribute to front-end features as needed, collaborating with UI/UX teams using React.

Translate product requirements into technical solutions, owning features from conception through deployment.

Write clean, maintainable, and well-tested code adhering to best practices.

Participate in code reviews, technical discussions, and team knowledge sharing.

Collaborate closely with product managers, designers, and other engineers to deliver cohesive user experiences.

Improve development workflows, standards, and automation processes.

Work with structured financial datasets and time-series data, ensuring correctness, consistency, and auditability of backend logic.

Benefits

Competitive salary and comprehensive benefits package including health, dental, and vision insurance.

Basic life insurance and short-term disability benefits.

401(k) retirement plan with company matching.

Flexible paid time off, sick leave, and paid holidays.

Cell phone reimbursement.

Opportunities for professional growth and development.

Remote work flexibility, supporting work-life balance.

Equal Opportunity & Fair Chance Hiring

Three+One® is an Equal Opportunity Employer. We are committed to fostering an inclusive environment and consider all qualified applicants regardless of race, color, religion, sex, national origin, disability, veteran status, or any other characteristic protected by law. We also consider qualified applicants with arrest or conviction records in accordance with applicable laws, including the California Fair Chance Act. We are dedicated to providing reasonable accommodations throughout the hiring process. If you require an accommodation, please indicate this in your application or contact us through our general inquiry channels.