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