Lead Software Developer – Fintech Platform

Location: Salt Lake, Sector V, Kolkata

Experience: 5–8 Years

Company: UnPay Innovation Pvt. Ltd.

About UnPay

UnPay is a fintech infrastructure company building scalable, API-first systems for payments, KYC, and lending. We focus on reliability, security, and core financial systems that power real transactions at scale.

Role Overview

This is not a feature-building role. You will own backend systems end-to-end—from architecture to production.

You’ll design and scale systems that handle real money movement, high concurrency, and strict compliance requirements. Expect accountability, not handholding.

Key Responsibilities

- Architect and build scalable backend systems and APIs
- Design payment flows, KYC systems, and financial workflows
- Own system reliability, performance, and security
- Integrate with banks, NBFCs, and third-party APIs
- Implement transaction handling, idempotency, and failure recovery
- Lead code reviews and engineering standards
- Mentor developers and drive execution discipline
- Debug and resolve production issues independently

Tech Stack

- Backend: Node.js, Python (FastAPI / NestJS / Express)
- Databases:



PostgreSQL, MongoDB, Redis
- Architecture: Microservices, REST APIs, event-driven systems
- Cloud: AWS / GCP
- DevOps: Docker, CI/CD
- Messaging: Kafka / RabbitMQ (positive to have)

Must-Have Skills

- Strong system design and backend architecture skills
- Experience building high-scale production APIs
- Solid understanding of databases, indexing, and optimization
- Knowledge of authentication & authorization (JWT, OAuth)
- Understanding of transaction systems and failure handling
- Strong debugging and problem-solving ability
- Ability to take ownership without supervision

Good to Have

- Fintech / payments / lending experience
- Ledger systems, reconciliation, or accounting flows
- Experience with RBI-compliant systems, KYC flows
- Experience with Go (for high-performance services)
- Exposure to Kafka or event-driven architecture

What We Don’t Want

- Developers who only follow tickets
- Low ownership or dependency on constant guidance
- Resume-heavy, execution-light candidates

Job Type: Full-time

Work Location: In person

📌 Software Team Lead (Kolkata)
🏢 Unnatim
📍 Kolkata