Hi, I'm Swagat.
I build
Software engineer at Pine Labs (Mosambee) building payments infrastructure. Backend-first, systems-obsessed, CP addict.
About Me
Final-year CSE student at IIIT Nagpur (2022–26), building alternate payments infrastructure at Pine Labs (Mosambee) in Mumbai — QR generation, concurrent transaction scheduling, async bank callbacks.
I care about systems that are fast, correct, and observable. Actively looking for full-time SDE roles from June 2026.
LeetCode Knight
1800+ rating · 600+ problems
Fraud Detection ML
AUC 0.9614 · Kafka + XGBoost + Redis
Payments Infrastructure
UPI · BQR · Spring Boot · Java
IIIT Nagpur CSE
CGPA 8.59 · Batch of 2026
Experience
- Engineered end-to-end bank integration flows covering QR code generation, transaction status polling, callback processing, and refund initiation using Java and Spring Boot.
- Designed and implemented a concurrent transaction scheduler that periodically polls pending transactions per bank-specific retry requirements, processing requests in parallel to reduce settlement latency.
- Integrated multiple banking partners and alternate payment methods (UPI, BQR) into the existing payments platform, enabling support for new payment channels with minimal changes to core modules.
- Built robust callback-handling mechanisms to process async payment confirmations from banking APIs, ensuring idempotent state transitions and consistent transaction records.
Projects
Real-Time Fraud Detection Pipeline
End-to-end ML system for streaming fraud detection with explainable AI and a live React dashboard.
- Distributed streaming pipeline: Python producer → Kafka (3 partitions) → XGBoost inference → PostgreSQL + Redis. AUC: 0.9614 on the credit card fraud dataset.
- Integrated SHAP for feature-level explainability and Claude AI for human-readable fraud reasoning, surfaced via React + Recharts dashboard with live WebSocket updates.
Parallel File Encrypter
High-performance C++ application for parallel encryption and decryption of 1000+ files simultaneously.
- Encrypts and decrypts 1000+ files simultaneously using multithreading.
- Utilized POSIX shared memory (shm_open, mmap) for efficient inter-process communication.
Other Projects
BookWorm
Full-stack React Native mobile app for sharing and discovering book recommendations.
TeleChat
Full-stack social media web app with real-time chat and Instagram-like features.
Customizer-T
Interactive 3D T-shirt customization platform with real-time design preview.
Skills & Tech
Get In Touch
// what's next?
Let's Build
Something.
Actively looking for full-time SDE roles from June 2026 — backend, fintech, distributed systems, or developer tools. Let's talk.
swagatk1004@gmail.com