Open to Senior / Lead Backend roles

Arun Pratap

Singh

Lead Engineer · Kellton India

📍 Lucknow / Gurgaon, India  ·  linkedin.com/in/arunpratap7

Senior Java engineer with 7 years building high-throughput, production-grade backend systems — from scalable flight booking engines at ixigo to enterprise supply chain APIs at Kellton. Now at the frontier of LLM integration with Claude, GPT-4, and Gemini.

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APS 7 yrs · Lead Eng
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About

Building high-throughput systems at the intersection of Travel, Fintech, and AI

I'm a Senior Java engineer with 7 years building high-throughput, production-grade backend systems — from scalable flight booking engines at ixigo to enterprise supply chain APIs at Kellton.

My core stack is Java 11/17/21 · Spring Boot 3 · Microservices · Apache Kafka · PostgreSQL · REST APIs. I specialise in event-driven architectures, CI/CD with Azure DevOps, and cloud deployments on AWS and Azure.

In the travel domain I've delivered end-to-end Amadeus GDS integration (search, pricing, booking, ticketing) and built LCC partner pipelines handling thousands of concurrent requests.

"I actively integrate LLMs — Claude, GPT-4, Gemini — into backend systems and use Cursor IDE daily for AI-accelerated development."

Open to Senior / Lead Backend roles in Travel Tech, Fintech, or AI-first product companies. Let's connect.

7
Years Experience
Production backend systems
3
LLMs Integrated
Claude · GPT-4 · Gemini
4+
Industry Domains
Travel · Fintech · Supply Chain · Logistics
∞
APIs Shipped
High-throughput, low-latency

Technical Skills

Core Stack

Languages & Frameworks

Java 11/17/21 Spring Boot 3 Spring MVC Spring Security Spring Data JPA Hibernate 4+ Python 3

Microservices & Messaging

Microservices Architecture Apache Kafka RESTful APIs WebSockets Event-Driven Design gRPC

Travel Tech & GDS

Amadeus GDS (End-to-End) LCC Partner Integrations Flight Search & Pricing Booking & Ticketing NDC APIs PNR Management

AI / LLM Integration

Claude API (Anthropic) OpenAI GPT-4 Gemini API Prompt Engineering RAG Pipelines Cursor IDE LangChain

Cloud & DevOps

Microsoft Azure Azure DevOps (CI/CD) AWS (DynamoDB, SNS, Chime) Docker Kubernetes Atlassian BitBucket/Bamboo

Databases & Tools

PostgreSQL MySQL MS SQL AWS DynamoDB Hibernate ORM DBeaver JUnit 5 Postman Swagger UI Splunk

Work Experience

Professional Journey

Lead Engineer

Current

Kellton India Pvt. Ltd. · Gurgaon, India

Sep 2024 – Present

  • Lead the backend engineering team delivering enterprise-grade Java/Spring Boot microservices for supply chain and warehousing platforms.
  • Architect and review RESTful APIs, ensuring scalability, security, and adherence to design patterns across multiple product teams.
  • Drive adoption of AI-assisted development using Cursor IDE, Claude, and GPT-4 to improve developer productivity and code quality.
  • Manage Azure DevOps CI/CD pipelines for deployments across Development, UAT, and Production environments.
  • Conduct code reviews, mentor junior engineers, and define technical roadmaps aligned with business goals.
Java 17/21 Spring Boot 3 Microservices Azure DevOps Claude API GPT-4 Kubernetes PostgreSQL

Software Engineer

Fintech / Supply Chain

Earlier Roles · 2018 – 2022

4 years · Java backend development

  • Built and maintained Java/Spring Boot backend services for Fintech and Supply Chain clients, handling payment processing, financial reconciliation, and logistics integrations.
  • Developed RESTful APIs, event-driven microservices with Kafka, and integrated third-party payment gateways including Stripe API.
  • Worked with React Native (Basic) and React JS for supporting full-stack feature delivery on cross-functional teams.
  • Established strong foundations in system design, high-throughput API design, and ETL pipelines using Python.
Java 8/11 Spring Boot Kafka MySQL Stripe API ETL (Python) React Native

Domain Expertise

Where I Create Impact

✈️

Travel Technology

End-to-end Amadeus GDS integration — search, pricing, availability, PNR creation, ticketing. LCC partner pipelines. High-concurrency flight booking backends at ixigo scale.

🤖

LLM Integration

Embedding Claude, GPT-4, and Gemini into production backend systems. Prompt engineering, RAG pipelines, AI-accelerated development with Cursor IDE.

💳

Fintech

Payment gateway integrations (Stripe), transaction processing, financial reconciliation systems, and building secure, compliant Fintech backends with high reliability.

📦

Supply Chain & Logistics

Enterprise supply chain APIs, warehousing platform backends, and logistics integration services connecting complex multi-party systems at Kellton.

⚡

High-Throughput Systems

Event-driven microservices with Apache Kafka, horizontally scalable Spring Boot services, and low-latency API design for thousands of concurrent requests.

☁️

Cloud & DevOps

Azure DevOps CI/CD pipelines, AWS deployments (DynamoDB, SNS, Chime), Docker, Kubernetes, and production observability with Splunk.

Career

Open to Senior & Lead Backend Roles

After 7 years building production-grade backend systems across Travel Tech, Fintech, and Supply Chain — and now leading engineering teams at Kellton — I'm actively exploring my next big challenge.

I thrive in environments where technical depth matters — where the problems are genuinely hard, the scale is real, and engineering decisions have direct business impact.

I'm particularly excited about AI-first product companies integrating LLMs into core workflows, and Travel Tech or Fintech companies with complex domain problems worth solving.

Let's talk if you're building something meaningful. I'm reachable at datsmearun@gmail.com or via LinkedIn.

🎯
Senior Backend Engineer
Java · Spring Boot · Microservices
🚀
Lead Backend Engineer
Team leadership · Architecture · Mentoring
✈️
Travel Tech Specialist
GDS · NDC · Booking platforms
🤖
AI/LLM Backend Engineer
Claude · GPT-4 · Gemini integration

Contact

Let's Build Something Together

Senior / Lead Backend roles in Travel Tech, Fintech, or AI-first product companies. Open to both full-time and consulting conversations.

datsmearun@gmail.com
ARUN PRATAP SINGH