Backend Engineer - Python

You will be joining ROI-AI, a seed-stage startup founded by Ex-Google Deepmind, which is focused on automating chargeback dispute management in wholesale and retail distribution using an AI-powered platform. As a Backend Engineer, your role will involve working on core systems that process chargebacks, manage cases, and integrate with financial services infrastructure to directly impact product delivery and customer success. **Key Responsibilities:** - Design and implement backend services in Python using FastAPI - Build and maintain APIs supporting web applications - Utilize PostgreSQL databases and optimize query performance - Implement financial calculations accurately and with auditability - Write tests to maintain high code quality standards - Collaborate with frontend engineers on API contracts and system design - Contribute to infrastructure tooling and deployment pipelines **Qualifications Required:** - 4+ years of backend development experience - Strong proficiency in Python, with knowledge of FastAPI, async/await, and Pydantic preferred - Experience with relational databases, particularly PostgreSQL, and SQL - Understanding of RESTful API design - Familiarity with Docker and containerized development - Ability to work effectively in a fast-paced startup environment - Excellent written and verbal communication skills - Candidates preferred from tier 1 & tier 2 colleges **Nice to Have:** - Experience with Node.js/TypeScript - Knowledge of financial calculations and billing systems - Proficiency in AWS services beyond basics (S3, SES, Secrets Manager) - Experience with multi-tenant SaaS architecture - Background in authentication systems such as Clerk or Auth0 - Exposure to AI/ML integrations or LLM APIs - Previous experience in startups or as a founding engineer In the first 90 days, your focus will be on: - Month 1: Onboarding, understanding the codebase, and shipping 1-2 small features - Month 2: Owning a core workflow (billing, remittance tracking, or integrations) - Month 3: Leading the implementation of a major feature and contributing to architecture decisions Please note the interview process will involve a 60-minute technical screen involving live coding and system design, followed by a 30-minute founder interview for deep dive, Q&A, and alignment. This is a full-time position with an in-person work location. (Note: Additional details about the company were not specified in the provided job description.),