$ whoami

Raj Kumar Paswan

Backend Software Engineer · Python · Distributed Systems · AWS · GenAI

5+ years designing and owning large-scale distributed systems in Django and FastAPI on AWS. I ship production LLM systems (RAG, LangChain, LangGraph) and consistently drive 40–70% improvements in latency, cost and deployment velocity.

5+
years shipping backend
10K+
concurrent users served
99.9%
production uptime
<100ms
API latency at 50K req/day

01.Skills

Languages & Frameworks

PythonDjangoDRFFastAPIFlaskCelerySQLAlchemy

Distributed Systems

MicroservicesEvent-DrivenREST / WebSocketCachingMessage QueuesHLD / LLD

Cloud & DevOps

AWS EC2S3LambdaSQS / SNSRDSCloudWatchTerraformDockerKubernetesCI/CD

Data Stores

PostgreSQLMySQLMongoDBRedisElasticSearch

GenAI / LLM

RAGLangChainLangGraphOpenAI Function CallingPineconePrompt Engineering

02.Experience

  1. Software Engineer @ Country Delight (Beejapuri Dairy)

    Apr 2026 — Present

    Gurgaon

    • ▹Own backend services and the Django admin platform powering daily operations for one of India's largest D2C dairy brands.
    • ▹Re-architected high-traffic SQL queries and schemas, cutting report generation and API latency across core dashboards.
    • ▹Built end-to-end stock and procurement workflows, improving inventory accuracy and reducing manual reconciliation.
    • ▹Designed delivery-partner systems: onboarding, support, and automated salary/tips payouts at scale.
  2. Software Engineer @ Quokka Labs LLP

    Jul 2023 — Mar 2026

    Noida

    • ▹Owned architecture of 5+ production microservices (Django/FastAPI on AWS) serving 10,000+ concurrent users at 99.9% uptime.
    • ▹Cut database load 60% and p95 latency 45% by eliminating N+1 queries and strategic indexing.
    • ▹Reduced response time 40% with Redis caching and SQS/SNS event-driven decoupling.
    • ▹Shipped a GPT-4 + LangChain RAG support chatbot automating 5,000+ conversations/month at 90%+ accuracy.
    • ▹Cut deployment time 70% with Terraform, Docker and standardized CI/CD; mentored 3 engineers.
  3. Software Developer (Python) @ TOW Business

    May 2022 — Nov 2022

    Kochi

    • ▹Designed REST APIs sustaining 50,000+ daily requests at <100ms latency and 99.95% uptime.
    • ▹Reduced response times 65% via query refactoring, connection pooling and Redis caching.
    • ▹Scaled to 100,000+ daily Celery tasks with retry and dead-letter handling.
    • ▹Implemented OAuth2 and Stripe/Razorpay integrations; cut production bugs 40%.
  4. Software Developer @ FindingPI (Shreyas Technosoft)

    Dec 2021 — Apr 2022

    Pune

    • ▹Reduced downtime 60% resolving critical production issues across Python services.
    • ▹Automated health checks for 50+ servers, cutting manual interventions 80%.
    • ▹Reduced MTTD 75% with CloudWatch + SNS alerting.
  5. Software Developer @ Oasis Technologies

    Sep 2020 — Aug 2021

    Noida

    • ▹Built an HRM platform with IoT integration processing 10,000+ sensor data points daily.
    • ▹Developed Django backend for employee management serving 500+ employees.

03.Projects

Auto-Trading Platform for NSE/BSE

Real-time automated trading system scanning live markets with 99.5% signal accuracy across 1,000+ daily signals, with low-latency stop-loss and profit-booking algorithms.

FastAPICeleryRedisPostgreSQLWebSocket

AI-Powered Garden Care Assistant

Serverless AI that generates personalized plant-care schedules by combining GPT function calling with live weather data.

OpenAI Function CallingOpenWeatherGCP FunctionsFastAPI

Energy Usage & CO₂ Emission Tracker

Sustainability platform with CO₂ calculations, eco-scoring and vendor recommendations. Supports 5,000+ users, driving 20–30% energy cost reductions.

DjangoPostgreSQLCelery

Education

Master of Computer Applications

Harcourt Butler Technical University, Kanpur · 2017–2020

B.Sc. Mathematics (Hons)

Rajdhani College, Delhi University · 2013–2016

Certifications

  • Docker Foundations Professional Certificate
  • Ubuntu Linux Professional Certificate (Canonical)

04. what's next?

Let's build something reliable.

Open to backend, platform and GenAI engineering roles. My inbox is always open.

Gurgaon, India