Backend Software Engineer

three+one® provides liquidity and treasury solutions to public entities, including municipalities, counties, school districts, authorities, higher education institutions (public and private), and nonprofit organizations. We serve as a liquidity data partner that helps simplify cash, banking, and investment decisions so our clients can confidently maximize the value of their cash. Our technology and partnership empowers entities to make data‑driven financial decisions.

We uncover new sources of income and savings for entities looking to innovate and identify new resources for our clients by identifying all cash as a revenue‑generating asset. On average, our work leads to 30% more earnings and 73% more cash being invested confidently. Our core services include:

• cash
  
  Vest®, a platform for liquidity monitoring and forecasting
• rfpPrep®, a digital tool to streamline banking and investment procurement
• muni
  
  Bank, a banking fee benchmarking solution
• Additional tools are currently in development.

We're seeking a driven Backend Software Engineer to help grow one of the nation's fastest‑growing public sector fintech firms. As a Software Engineer, you'll be instrumental in building and scaling the platform infrastructure that helps public entities across the country make smarter, more confident financial decisions. This role is ideal for a self‑motivated, goal‑oriented individual who enjoys working with data‑intensive applications, and is looking to grow into more advanced system design and architectural responsibilities over time.

This position reports to the Chief Product and Technology Officer and will be fully remote. Travel is expected to be up to 5%.

As a Software Engineer, you will support:

• Design, build, and maintain scalable APIs and backend services.
• Work with financial and transactional data pipelines, ensuring accuracy and performance.
• Improve system reliability, observability, and performance.

• Contribute to front‑end features using React when needed.
• Collaborate with designers and product to deliver cohesive user experiences.
• Help connect backend systems to intuitive, performant UI components.

• Own features from design through deployment with guidance from senior engineers.
• Translate product requirements into technical implementations.
• Write clean, maintainable, and well‑tested code.
• Participate in code reviews and technical discussions.
• Work closely with product, design, and other engineers.
• Contribute to improving development workflows and standards.

• Work with structured financial datasets and time‑series data.
• Ensure correctness, consistency, and auditability of backend logic.

• Bachelor's degree plus minimum five years work experience.
• Minimum 3–5 years of relevant and progressive software engineering experience.
• Demonstrated proficiency in Python.
• Proven ability to build and maintain APIs.
• Experience with relational databases and version control (Git), CI/CD workflows.
• Exposure to cloud platforms (AWS, GCP, or similar) and containerization basics.

• Experience in Fin Tech, banking, or financial systems.
• Familiarity with data processing or ETL workflows.
• Exposure to infrastructure‑as‑code tools.
• Experience working with analytics or reporting systems.
• Exceptional attention to detail, time management, and the ability to manage multiple priorities independently.
• Growth‑oriented mindset with the ability to accept and act on feedback constructively.
• Eager to learn, results‑driven, and adaptable.

We anticipate the application window for this opening will close on:
June 5th, 2026. Submission does not guarantee selection, and three+one reserves the right to modify or cancel the hiring process at any time.

Only shortlisted candidates will be contacted. We’ll retain all applications for future consideration.

Selected candidates will be asked to participate in a technical coding exercise as part of the interview process to demonstrate technical proficiency and reasoning.

At three+one, we invest in our team’s health, well‑being, and growth - offering…