Open to opportunities

Lakshay Aggarwal

@lakshayaggarwal

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Senior backend engineer building distributed payment systems in Java, Go, and Python.

India

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What I'm looking for

I’m looking for an end-to-end backend role in distributed, event-driven payments/fintech, where I can own production systems in a remote async team and continuously improve latency, reliability, and observability.

I’m a full-stack software engineer with 4+ years building production backend systems and end-to-end web products across payments, fintech, logistics, and e-commerce. I’m especially strong in Java (Spring Boot), Go, Python (FastAPI), and Node.js (Express), and I enjoy owning systems end-to-end in remote, async teams.

In distributed, event-driven environments, I’ve shipped services that handle millions of daily transactions—designing idempotent payment and loan APIs, building Kafka-based fraud detection, and migrating time-critical Java modules to Go for 45% lower CPU. I build for reliability and performance: fault-tolerant ingestion pipelines, retries with backoff, and observability that helps me diagnose issues faster.

Recently, I’ve led real-time product work at Lilo—optimizing MongoDB indexing to cut dashboard data-retrieval latency by 40%+ and building React + TypeScript dashboards with real-time WebSocket updates. At Paytm and Eshopbox, I scaled mission-critical services and improved operational outcomes like 99.5%+ pipeline uptime, ~50% lower MTTD, and a 33% RTO reduction—because great software should be fast, dependable, and measurable.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Engineer

Current

Lilo

Dec 2025 - Present (6 months)

Owned end-to-end development of a real-time order-tracking and data-collection platform using Node.js, NATS, MongoDB, and React, taking features from requirements to production. Built fault-tolerant ingestion pipelines and delivered live dashboards with WebSocket-based updates for internal operations teams.

Node NATS MongoDB React TypeScript WebSockets REST APIs Retry Logic

Senior Software Engineer

Paytm

Nov 2024 - Dec 2025 (1 year 1 month)

Built and scaled mission-critical loan-processing and trade-simulation services across Java (Spring Boot), Python (FastAPI), and Go. Reduced loan-processing API latency 35%+ through async programming, SQL indexing, Redis caching, and connection pooling, and designed idempotent payment/loan APIs to prevent duplicate charges and writes under failures.

Java Spring Boot Go fastAPI Kafka Redis PostgreSQL Async Programming Observability

Software Development Engineer I

Eshopbox Pvt Ltd

Oct 2022 - Nov 2024 (2 years 1 month)

Built and maintained logistics microservices in Java (Spring Boot) for order, inventory, and tracking, and migrated time-sensitive modules to Go to improve performance. Implemented a real-time notification system using WhatsApp Business API, Kafka events, and Redis-based schedulers, and reduced return-to-origin (RTO) rate by 33% through predictive logic and address validation.

Java Spring Boot Go Kafka Redis REST APIs Microservices Observability WhatsApp Business API SQL

Software Developer

Careers360

Jul 2022 - Sep 2022 (2 months)

Developed a dynamic brochure-generation system using Django that served 25,000+ schools. Optimized MySQL queries and implemented template-based PDF rendering for fast document generation.

Django Python MySQL REST APIs SQL Query Optimization Template Rendering Web Services

Software Engineer Intern

DailyObjects

Jul 2021 - Oct 2021 (3 months)

Automated marketing and feedback reporting using JavaScript and MongoDB. Built secure TypeScript APIs and fixed checkout and cart defects in a high-traffic e-commerce flow.

JavaScript TypeScript MongoDB REST APIs E Commerce Debugging API Security Testing CI CD