Headline

Backend Software Engineer | Python & FastAPI | Fintech & Fraud Systems | PostgreSQL, SQLAlchemy, Redis | Docker & AWS | Self-taught | Ethics-driven engineer

About

Backend Software Engineer with nearly 3 years of experience building fintech, payment processing, banking, and business integration platforms using Python and FastAPI. Currently working at Paywint, where I develop and maintain payment systems, integrate payment gateways, and build third-party integrations including Zoho SalesIQ. My experience includes NMI payment gateway integrations, payment reconciliation, idempotent transaction processing, OAuth 2.0 authentication, webhook-driven architectures, and AWS-based deployments. Previously worked at Zil Money on BankerData, a banking aggregation platform serving US-market customers, where I integrated financial data providers such as Plaid and Yodlee and contributed to fraud detection systems and financial data processing workflows. My core technical expertise includes: • Python • FastAPI • PostgreSQL • SQLAlchemy • Redis • AWS (EC2, RDS, S3) • NMI Payment Gateway • Plaid & Yodlee Integrations • Zoho SalesIQ Integrations • OAuth 2.0 • Webhooks • REST APIs I enjoy designing reliable backend systems, integrating complex third-party platforms, and building software that solves real business problems. My focus is on writing maintainable code, designing scalable architectures, and delivering production-ready solutions that can be trusted in fintech and business-critical environments. Always interested in connecting with professionals working in Backend Engineering, Fintech, Payments, SaaS, FastAPI, and Business Automation.

Location

Greater Bengaluru Area

AI stack

claude code

claude

codex

gemini

openai

claudecode

Work experience

Senior Backend Developer at Paywint, Jan 2025 - Present · 1 yr 8 mos, Manjeri, Kerala, India, • Owned backend architecture and delivery for a payment platform using FastAPI and PostgreSQL. • Integrated NMI payment gateway end-to-end, including authorization, capture, refunds, voids, and webhooks. • Implemented idempotency mechanisms to prevent duplicate charges and ensure safe retries. • Built reconciliation workflows to align internal transactions with gateway settlement reports. • Designed secure, scalable REST APIs supporting real-world transaction volumes. • Implemented async processing, caching, and background jobs using Redis. • Deployed and operated services on AWS (EC2, S3, RDS).

Python Developer at Zil Money, Sep 2023 - Dec 2024 · 1 yr 4 mos, Manjeri, Kerala, India

Student at Brototype, Aug 2022 - Sep 2023 · 1 yr 2 mos, Kochi, Kerala, India

Education

BHM, Hospitality Administration/Management, M.S. RAMAIAH UNIVERSITY OF APPLIED SCIENCES, BANGALORE

Public links

github: https://github.com/midhunpaini