Principal Software Engineer @ Beacon.li · Hyderabad

Gulshan Kumar Singh

I turn complex ideas into fast, reliable web platforms, and lately, into AI copilots that make them smarter.

Top skills: React

8+years building
for the web

Previously atBritish TelecomEsportsXOVimaan RoboticsCredRCreditap

About

I started in 2018 building React and Angular front ends at a fintech startup, then grew into full-stack work across lending, mobility, robotics, and esports. Along the way I led a React SSR migration, built JWT-based access control, and, as tech lead at EsportsXO, shipped Next.js apps on AWS and Kubernetes.

At British Telecom I built Next.js buy journeys and the agent backend behind them. Today, as Principal Engineer at Beacon.li, I work on media ingestion and an AI copilot built on Claude, LangChain, and Qdrant. Outside product work I research cloud security, with two papers published by Springer.

IndustriesFintech, mobility, robotics, esports, telecom, and AI SaaS: 6
Springer publicationsCloud DDoS detection and cross-VM attacks: 2
Lead and architecture rolesTech Lead, Specialist, and Principal Engineer: 3

What I do

Full-stack platforms
Web apps with React, Next.js, Node.js, and Spring Boot, with server-side rendering for speed and SEO.
- React
- Next.js
- Node.js
- Spring Boot
AI and RAG systems
Copilots and retrieval-augmented search with Claude, LangChain, and Qdrant.
- Claude
- LangChain
- Qdrant
Cloud and architecture
AWS, Kubernetes, and Docker, with JWT and role-based access control and clean service design.
- AWS
- Kubernetes
- Docker
- JWT

Experience

Oct 2018 – Present · 8 yrs 1 mo · Trainee Software Consultant → Principal Software Engineer

Principal Software Engineer
Beacon.liCurrent
Hyderabad, Telangana, India
May 2026 – Present6 mos
- Working on the media ingestion pipeline, improving support for large files, tabular data parsing, broader file-type support, image extraction, and content size limits
- Contributed to the copilot chat service, fixing a context-overload issue in conversation history handling
- Working with the Qdrant vector database that powers file retrieval and search, including storage and capacity troubleshooting
- Built retrieval-augmented generation using Claude models through an internal AI gateway, orchestrated with LangChain and Qdrant
- Large Language Models (LLM)
- Node.js
- Claude
- Next.js
- JavaScript
Software Engineer Specialist
British Telecom (BT)
Bengaluru, Karnataka, India
Dec 2023 – Apr 20262 yrs 5 mos
- Developed end-to-end customer buy journeys using Next.js and its backend for API and authentication across multiple BT products
- Led the creation of hybrid customer and agent journeys, reusing the buy journey with UI enhancements and a dedicated agent data backend
- Engineered a backend for the hybrid agent journey, enabling multi-customer management, incentive tracking, and end-to-end order oversight
Tech Lead
EsportsXO
Bengaluru, Karnataka, India
Jan 2022 – Dec 20232 yrs
- Worked on the latest versions of React and Node.js
- Hands-on work with Next.js for React server-side rendering and KoaJS for the backend
- Worked with Kubernetes and AWS services including RDS, ELB, VPC, and MediaConvert
Earlier roles
Senior Software Developer - Fullstack · Vimaan Robotics India Pvt. Ltd.Dec 2020 – Dec 2021
Bengaluru, Karnataka, India
- Worked on multiple Angular projects, including Material design and authentication modules
- Developed a runtime cron scheduler using the Quartz library
- Developed role-based authentication using an API gateway to manage traffic to multiple microservices
- Worked with Spring Security using JWT tokens and Zuul for the API gateway
Senior Development Engineer - Fullstack · CredR - Incredible Technologies Pvt. Ltd.Aug 2019 – Nov 2020
Bengaluru, Karnataka, India
- Migrated a React SPA to isomorphic server-side rendering for better SEO, using JS patterns and current React patterns
- Created a scalable server for the customer-facing website using AWS services such as ELB, S3, Route 53, IAM, and CloudFront
- Implemented JWT authentication in the back end and front end for security and role-based access control
Trainee Software Consultant · Creditap Technologies Private LimitedOct 2018 – Jul 2019
Bengaluru, Karnataka, India
- Worked on three projects, including unit testing, using current design patterns for code base management
- Worked with AWS services including S3, EC2, Route 53, CloudFront, IAM, and Lightsail
- Developed APIs with Express and Node.js, including JWT authentication and role-based access control

Experience

Skills

42 technologies · 8+ years shipping to production

Core stack

TypeScript
React
Next.js
Node.js
Spring Boot
PostgreSQL
AWS
Kubernetes
Claude
LangChain

Languages04
- JavaScript
- TypeScript
- Java
- Shell Scripting
Frontend07
- React
- Next.js
- Angular
- HTML5
- CSS3
- SCSS
- Material
Backend06
- Node.js
- Express.js
- KoaJS
- Spring Boot
- REST APIs
- JWT
AI06
- Claude
- LangChain
- Prompt Engineering
- Large Language Models (LLM)
- Retrieval-Augmented Generation (RAG)
- MCP Tool Design
Databases04
- MySQL
- PostgreSQL
- MongoDB
- Qdrant
Cloud & DevOps03
- AWS
- Docker
- Kubernetes

Also worked with · 12 more

Security: Role-Based Access Control
Platform & Tools: Linux · Windows · Xen · XenServer · Tcpdump · SSH · Hping · GDB · AWK · Xentools · AB2

Skills

Credentials

2 degrees · 2 publications · 10 certifications

Publications02

Conference paper · Springer Nature · 2022
Detecting Cloud Originated DDoS Attacks at the Source Using Out-Cloud Attack Detection (OCAD)
ICISS 2022 · LNCS vol. 13784
Gulshan Kumar Singh, Gaurav Somani
DOI
Book chapter · Springer · 2018
Cross-VM Attacks: Attack Taxonomy, Defense Mechanisms, and New Directions
Versatile Cybersecurity · Advances in Information Security vol. 72
Gulshan Kumar Singh, Gaurav Somani
DOI

Education02

2016 – 2018
Computer Science and Engineering
Master of Technology · Central University of Rajasthan
2012 – 2016
Information Technology
Bachelor of Engineering · Chhattisgarh Swami Vivekanand Technical University

Certifications10

Latest certification

Claude Certified Architect - Foundations

Anthropic · Issued Jul 2026

Valid until Jul 2027Verify

TypeScript Essential Training
LinkedIn · Jan 2024
Information Security
freeCodeCamp · Jun 2023

+7 more

Data Visualization
freeCodeCamp · Jun 2023
Back End Development and APIs
freeCodeCamp · Jun 2023
Front End Libraries
freeCodeCamp · Jul 2021
JavaScript Tutorial
Sololearn · Aug 2018
CSS Fundamentals
Sololearn · Aug 2018
HTML Fundamentals
Sololearn · Aug 2018
Java Tutorial
Sololearn · Aug 2018

Credentials

Contact

What's next?

Let's build something.

Open to principal and staff engineering roles, AI product work, and interesting collaborations. My inbox is always open.

Say hello

LinkedIn GitHub

Hyderabad / Bengaluruusually replies within a day

Gulshan Kumar Singh

What I do

Full-stack platforms

AI and RAG systems

Cloud and architecture

Core stack

Languages04

Frontend07

Backend06

AI06

Databases04

Cloud & DevOps03

Publications02

Detecting Cloud Originated DDoS Attacks at the Source Using Out-Cloud Attack Detection (OCAD)

Cross-VM Attacks: Attack Taxonomy, Defense Mechanisms, and New Directions

Education02

Computer Science and Engineering

Information Technology

Certifications10

Claude Certified Architect - Foundations

Let's build something.

Core stack

Languages04

Frontend07

Backend06

AI06

Databases04

Cloud & DevOps03

Publications02

Detecting Cloud Originated DDoS Attacks at the Source Using Out-Cloud Attack Detection (OCAD)

Cross-VM Attacks: Attack Taxonomy, Defense Mechanisms, and New Directions

Education02

Computer Science and Engineering

Information Technology

Certifications10

Claude Certified Architect - Foundations