Open to software engineering roles

Aman Kumar

Software Engineer — I build the payment and transaction systems that can't go down.

Four years at Tata Consultancy Services engineering backend services for Travelport, a global travel-tech platform used by 70,000+ agencies. My services clear 500K+ transactions a day across 15 GDS integrations at 99.95% uptime — written in Java 17 and Spring Boot, moved over Kafka and IBM MQ, and shipped on OpenShift and Amazon EKS.

Get in touch See the work GitHub
Gurugram, India amankamboj02000@gmail.com +91 86858 30983
500K+
Payment transactions processed per day
99.95%
Uptime on revenue-critical services
70%
API throughput gain from the REST rebuild
25+
Zero-downtime production releases shipped
Experience

Four years on one platform, three teams deep.

Same client, increasing scope: from hardening payment APIs, to migrating a legacy document platform, to architecting a new retrieval service. The numbers below are production numbers.

Mar 2025 — Present · Current

Ticket Repository Team

System Engineer, Java Backend · Tata Consultancy Services · Client: Travelport

Java 17Spring BootMongoDBAWS S3CloudWatchOpenShift
  • Architected a ticket-retrieval microservice serving 200K+ REST requests per day, fetching MongoDB records by PNR and ticket number.
  • Integrated AWS S3 log archival and CloudWatch dashboards for live monitoring, cutting issue-detection time by 60%.
  • Deployed containerised services on OpenShift via GitHub Actions CI/CD, enabling 15+ zero-downtime releases per month.
  • Designed a pluggable response formatter supporting XML, JSON and EDIFACT — accelerating new-client onboarding by 35% and saving ~40 developer-hours per release.
Mar 2025 — Present

EMD Team · Electronic Miscellaneous Document

System Engineer, Java Backend · Tata Consultancy Services · Client: Travelport

Java 17SpringHibernateApache Camel 3GitHub Actions
  • Migrated the EMD application from Java 8 to Java 17 and Camel 2 to Camel 3, refactoring 40+ Camel routes with zero production regressions.
  • Rebuilt the legacy REST integration layer on the native Java HTTP client — +70% API throughput and roughly $20K/year saved in infrastructure cost.
  • Delivered 12 core EMD features for ancillary products (seats, meals, lounges) across 10+ airline carriers.
  • Unified Payments, PNR, TSR Billing, IATA and airline-system integrations through Apache Camel routes, improving cross-system reliability by 35%.
  • Shipped production hotfixes under 4-hour SLAs, sustaining 99.9% availability on revenue-critical EMD services.
Jan 2023 — Mar 2025

Payments Team

System Engineer, Java Backend · Tata Consultancy Services · Client: Travelport

Java 17Spring BootIBM DB2IBM MQApache TomEE 9JenkinsDocker
  • Led the migration of payment microservices from Java 8 to Java 17 and TomEE 8 to TomEE 9 — +50% throughput, −30% memory.
  • Developed payment REST APIs processing 500K+ daily transactions across 15 GDS integrations at 99.95% uptime, with zero customer-impacting outages in 2024.
  • Cut average API latency by 40% (850ms → 510ms) through DB2 query tuning, connection pooling and caching.
  • Implemented OAuth 2.0 and JWT authentication with Spring Security across payment endpoints, with Fortify static analysis gating delivery in CI.
  • Authored JUnit and Mockito suites raising test coverage from 33% to 70%, ahead of 25+ zero-downtime releases.
  • Resolved 30+ critical production incidents as on-call engineer, improving MTTR by 45% through structured root-cause analysis and runbooks.
  • Mentored 5 junior developers and ran 100+ code reviews, lifting the SonarQube quality score by 25% across the payments codebase.
System design

What the platform actually looks like.

A simplified view of the Travelport payment and document platform I work on — the request path in gold, event and message flow in teal, persistence in grey. Every box below is something I have shipped to, debugged in production, or migrated.

Payments & ticketing platform — service topology Request path Events & messages Persistence
CLIENTS & CHANNELS Travel agencies 70,000+ WORLDWIDE GDS partners 15 INTEGRATIONS Airline carriers 10+ CARRIERS · ANCILLARIES API EDGE REST API layer OAUTH 2.0 · JWT · OKTA · SPRING SECURITY · SWAGGER / OPENAPI SERVICES — SPRING BOOT, CONTAINERISED Payments Service JAVA 17 · SPRING BOOT · TOMEE 9 500K+ TXN / DAY · 99.95% UPTIME EMD Service SPRING · HIBERNATE · APACHE CAMEL 3 40+ ROUTES · +70% THROUGHPUT Ticket Repository SPRING BOOT · REST · JAVA 17 200K+ REQUESTS / DAY MESSAGING & PERSISTENCE IBM DB2 PAYMENT LEDGER Apache Kafka EVENT STREAMS IBM MQ GUARANTEED DELIVERY MongoDB TICKET DOCUMENTS AWS S3 LOG ARCHIVAL RUNTIME & DELIVERY PLATFORM OPENSHIFT · AMAZON EKS · DOCKER · GITHUB ACTIONS · JENKINS · CLOUDWATCH · SONARQUBE · FORTIFY
Resilience
Resilience4j circuit breakers, retry with backoff, connection pooling and caching — 850ms → 510ms average API latency.
Delivery
GitHub Actions and Jenkins pipelines into OpenShift, gated by SonarQube and Fortify — 15+ releases a month, zero downtime.
Operations
CloudWatch dashboards and S3 log archival, on-call rotation, structured RCA and runbooks — 45% faster MTTR.
Stack

Tools I reach for, ranked by how often I use them.

Highlighted items are the ones I work in daily and would be comfortable being interviewed on to depth.

Languages

  • Java 17
  • Java 8
  • SQL
  • Python
  • C++
  • JavaScript

Frameworks & testing

  • Spring Boot
  • Spring MVC
  • Spring Security
  • Spring Data JPA
  • Hibernate
  • Apache Camel
  • Resilience4j
  • JUnit
  • Mockito

Architecture

  • Microservices
  • Distributed systems
  • REST APIs
  • System design (HLD / LLD)
  • SOLID
  • Design patterns
  • Multithreading
  • OOP

Messaging & data

  • Apache Kafka
  • IBM MQ
  • IBM DB2
  • MongoDB
  • MySQL
  • Oracle

Cloud & DevOps

  • AWS · S3, EC2, EKS, CloudWatch
  • Kubernetes
  • Docker
  • OpenShift
  • GitHub Actions
  • Jenkins
  • Maven
  • Apache TomEE

Security & APIs

  • OAuth 2.0
  • JWT
  • Okta
  • Swagger / OpenAPI
  • SOAP
  • Postman
  • Fortify

AI tooling

  • LLMs
  • RAG
  • Agentic AI
  • Prompt engineering
  • GitHub Copilot

Ways of working

  • Agile / Scrum
  • Code review
  • Git
  • JIRA
  • SonarQube
  • Nexus
  • IntelliJ IDEA
  • On-call
Side work

Things I built to learn the next layer down.

Both started as questions I couldn't answer from the day job — how orchestration really behaves, and what retrieval does to an internal knowledge base.

Infrastructure

Containerised microservice on Amazon EKS

Containerised a Spring Boot REST service with Docker and provisioned an Amazon EKS cluster to run it. Configured Deployments, Services and ConfigMaps for scaling and configuration management, then worked through pod scheduling, rolling updates and cluster troubleshooting with kubectl until failures stopped being mysterious.

DockerKubernetesAWS EKSSpring Boot
Applied AI

Knowledge retrieval tool for Confluence & Jira

Built a RAG-based retrieval tool over Confluence pages and Jira tickets with hybrid search, ticket-status lookup and severity-based prioritisation — cutting the manual search time teams spent hunting for the one runbook or the one closed ticket that already had the answer.

RAGHybrid searchConfluence APIJira API
Recognition & credentials

Awards, certifications, and 1,000 problems.

2024

Star Performer Award · Tata Consultancy Services

For delivering the Payments Java 17 migration two weeks ahead of schedule with zero production defects.

2023

On-The-Spot Award · Tata Consultancy Services

For resolving a P1 payment outage in under 90 minutes, preventing approximately $50K in revenue loss.

Ongoing

Top 15% on LeetCode

1,000+ problems solved with a 3+ year daily streak and weekly global contest rankings — the DSA and system-design fundamentals stay warm.

leetcode.com/u/amankumar01

2026

GitHub Copilot Certification · Microsoft

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Cert

Claude Certified Developer — Foundations · Anthropic

Verify credential

2018–22

B.Tech, Computer Science & Engineering

JP Mukand Lal Innovative Engineering & Technology Institute, Haryana, India — CGPA 8.75 / 10.

Contact

Hiring for backend, platform or payments? Let's talk.

Based in Gurugram, India. Open to software engineering roles — backend, distributed systems and platform teams. I reply to every message that isn't a bulk send.

Direct
Emailamankamboj02000@gmail.com → Phone+91 86858 30983 → LinkedInin/amankamboj02000 → GitHubgithub.com/amankamboj02000 → LeetCodeleetcode.com/u/amankumar01 →
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