Senior Software Engineer – Backend & AWS Integrations

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.
• Ability to understand an existing architecture and build components that fit into it.
• Experience using AI-assisted development tools in a practical engineering workflow, particularly for coding, code analysis, testing, and validation.
• Strong written and verbal English communication skills (C1 level).
• Ability to work independently, manage ambiguity, ask questions early, and take responsibility for delivering high-quality work.
• Experience applying the AWS Well-Architected Framework in production systems

Nice to Have

• Experience with payroll platforms, payroll systems, or payroll integrations; familiarity with Finch is a plus.
• Experience with banking, payment processing, money movement, financial infrastructure, ledgers, or reconciliation; familiarity with Modern Treasury is a plus.
• Knowledge of identity and authentication protocols such as OIDC or SAML 2.0.
• Experience with AWS CodePipeline or other CI/CD workflows, GitHub, and application monitoring tools such as Sentry.
• Familiarity with React or experience supporting frontend portals and dashboards.
• Hands-on experience with Claude Code, Claude, or similar AI-assisted engineering tools.

Soft Skills

• Self-starting and curious, with the confidence to ask questions instead of making assumptions or working silently with incomplete information.
• Highly accountable and ownership-driven; you follow tasks through, find the right resources, and proactively work through blockers.
• A strong communicator who can explain technical concepts and requirements clearly to both engineers and non-technical stakeholders.
• Collaborative and engaged, with a willingness to contribute ideas and participate in architectural discussions rather than simply wait for instructions.
• Comfortable challenging assumptions constructively and explaining why an alternative approach may lead to a better outcome.
• Adaptable and pragmatic, able to work effectively in a small team where priorities and requirements may evolve.

Other

• Full-time engagement (160 hours per month).
• Remote position open to candidates based in Latin America.
• English proficiency: C1