Backend engineer

1 day ago

Noida, Uttar Pradesh, India Mirrorsize US Inc. Full time ₹ 12,00,000 - ₹ 36,00,000 per year

About ROI-AI https://roiai.finance

ROI-AI

is building an AI-powered platform founded by Ex-Google Deepmind
for automating chargeback dispute

management in wholesale and retail distribution. Our platform helps analysts

reduce manual work by 90% through intelligent document parsing, evidence

assembly, and workflow automation.

We're a seed-stage startup with a solid technical foundation and early customer

traction, looking to expand our engineering team to complete our MVP and scale.

About the Role

We're looking for a Backend Engineer to join our small, fast-moving team. You'll work on core systems that

process chargebacks, manage cases, and integrate with financial services

infrastructure. This is a high-impact role where your work directly affects

product delivery and customer success.

Responsibilities

  • Design and implement backend services in Python (FastAPI)

  • Build and maintain APIs that power our web applications

  • Work with PostgreSQL databases and optimize query performance

  • Develop integrations with third-party services (payment processors, email, S3)

  • Implement financial calculations with precision and auditability

  • Write tests and maintain high code quality standards

-Collaborate with frontend engineers on API contracts and system design

-Contribute to infrastructure tooling and deployment pipelines

Tech Stack

LayerTechnologies:-

Backend -- Python 3.11+, FastAPI

Database-- PostgreSQL, MS SQL Server (customer ERP integration)

Infrastructure-- Docker, AWS (Lightsail, S3, SES, Secrets Manager)

CI/CD-- GitHub Actions, Terraform

Testing-- Pytest, integration tests

AI/ML-- Anthropic Claude, OpenAI (orchestration layer)

Requirements

  • 4+ years of backend development experience

  • Strong Python profi ciency (FastAPI, async/await, Pydantic preferred)

  • Experience with relational databases and SQL (PostgreSQL)

-Understanding of RESTful API design

-Familiarity with Docker and containerized development

-Comfortable working in a fast-paced startup environment

  • Strong written and verbal communication skills

-Candidates preferred from tier 1 & tier 2 colleges

Nice to Have

- experience

-Experience in fintech, payments, or dispute management

  • Financial calculations and billing system experience

  • AWS experience beyond basics (S3, SES, Secrets Manager)

  • Multi-tenant SaaS architecture experience

-Background with authentication systems (Clerk, Auth0)

-Experience with AI/ML integrations or LLM APIs

  • Previous startup or founding engineer experience

What You'll Work On (First 90 Days)

  • Month 1:Onboard, understand the codebase, ship 1-2 small features

  • Month 2:Own a core workflow (billing, remittance tracking, or integrations)

  • Month 3:Lead implementation of a major feature, contribute to architecture decisions

Our Interview Process

1.Technical Screen (60 min) - Live coding and system design

  1. Founder Interview (30 min) - Deep dive, Q&A, alignment

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