Senior Software Engineer – Backend & AWS Integrations

About the role

ABOUT THE ROLE

We're looking for a Senior Software Engineer with strong backend and AWS experience to help build and evolve a payroll giving platform from the ground up. You'll focus on designing and implementing APIs that connect third-party services with internal AWS components, supporting payroll integrations, financial management, and money movement.

You'll join a small, hands-on team and work closely with the Lead Engineer / Architect and Product stakeholders. This role is ideal for someone who can take ownership of components end to end, contribute to architectural decisions, and move comfortably between implementation, problem-solving, and collaboration. Experience with payroll systems is helpful, but strong API development and AWS integration experience are more important.

We value engineers who communicate openly, ask thoughtful questions, use AI-assisted development tools effectively, and take initiative to deliver reliable, maintainable solutions.

RESPONSIBILITIES

- Design, build, and implement HTTP APIs that connect third-party services with internal AWS components.

- Develop and extend integrations that support payroll connections and the onboarding of additional employer and payroll partners, primarily through the Finch API abstraction.

- Build backend components for the platform's financial management and money movement capabilities, including integrations with external financial services such as Modern Treasury.

- Develop, maintain, and improve AWS-based services using Infrastructure as Code and AWS CDK.

- Contribute to the evolution of the platform's architecture and implementation approach, applying AWS Well-Architected Framework principles with a focus on reliability, supportability, and cost effectiveness.

- Use AI-assisted development tools to accelerate code analysis, implementation, code reviews, testing, and validation.

- Take ownership of assigned components from clarifying requirements and identifying solutions through implementation and successful delivery.

- Collaborate with Product, Program Management, Partnerships, and technical team members, translating technical needs into clear language for both technical and non-technical stakeholders.

- Help ensure that the platform and its integrations are maintainable, supportable, and ready to scale as new partners and capabilities are introduced.

REQUIREMENTS

- Senior-level, hands-on experience building backend services and designing, developing, and integrating APIs.

- Strong practical experience with AWS, including building backend services in an AWS environment.

- Experience with AWS Lambda and Infrastructure as Code; familiarity with AWS CDK is expected.

- Experience integrating third-party APIs and connecting external services to internal systems or infrastructure.

- Working knowledge of Python and/or TypeScript. The team is flexible on the specific backend language, provided you have strong AWS and API development experience.