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das@systems — zsh online

Senior Software Engineer · Technical Lead

Backend systems that millions of people quietly depend on.

6.5+ years designing scalable Java & Spring Boot microservices for enterprise platforms — now building Generative & Agentic AI that automates real business workflows.

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0yrsEnterprise backend engineering

0+Microservices in the ecosystem

~0MSubscribers migrated in merger

<0msAPI response under load

JavaSpring BootSpring CloudMicroservicesREST APIsHibernate / JPARedisMySQL · MariaDBLangGraphLangChainRAGCI/CD JavaSpring BootSpring CloudMicroservicesREST APIsHibernate / JPARedisMySQL · MariaDBLangGraphLangChainRAGCI/CD

Profile

Building for scale, delivering to production.

I take enterprise systems from architecture through production — designing distributed, high-availability backends, leading engineering teams, and working directly with client leadership to ship business-critical features.

Most of my career has been at Tata Consultancy Services, where I grew from Software Engineer to Technical Team Lead building telecom platforms for CelcomDigi and Vodafone Idea. I've built products from scratch, owned end-to-end delivery in Scrum teams, and helped consolidate platforms through a major telecom merger.

Lately I've focused on Generative and Agentic AI — using LangGraph, LangChain, RAG and MCP to automate workflows that used to eat engineering time. I'm currently based in Kuala Lumpur and open to roles worldwide.

Distributed systems API design Team leadership Client consulting Agile delivery

Experience

Where I've built things.

Six and a half years at TCS, delivering enterprise-scale platforms for global telecom clients.

experience.log tailing

INFO Jan 2024 — Present

TCS · CelcomDigi Berhad

Kuala Lumpur, Malaysia

Senior Software Engineer / Technical Team Lead

Sales Partner Portal

Lead design and development of enterprise backend applications powering dealer onboarding, partner lifecycle management, and telecom business operations.
Build scalable Spring Boot microservices and REST APIs with Java, Spring Cloud, Hibernate, JPA, Redis, MySQL and MariaDB across a 100+ microservice ecosystem.
Implemented Elasticsearch-backed search and retrieval for high-volume partner and transaction data, cutting query latency and offloading expensive reads from the relational database.
Secure enterprise APIs and microservices with Spring Security, OAuth 2.0, JWT authentication and role-based access control (RBAC).
Created an end-to-end Playwright test suite that runs headlessly from a single command — raising live orders, capturing screenshots, and auto-generating error reports, cutting manual QA effort significantly.
Drive the full delivery lifecycle: architecture, code reviews, CI/CD via Azure DevOps, GitLab, GitHub, Jenkins and Maven, production releases, and root-cause incident resolution while maintaining high availability.
Played a key role in the Celcom–Digi platform consolidation, supporting migration of ~11 million subscribers after the merger.

INFO Jun 2021 — Dec 2023

TCS · CelcomDigi Berhad

India / Malaysia

Software Engineer — Dealer Management System

Built from scratch as a complete product

Delivered scalable modules for dealer onboarding, outlet and partner management, and approval workflows for the enterprise sales ecosystem.
Designed high-throughput Spring Boot microservices handling ~50,000 API calls/day with sub-200ms responses under sustained load.
Owned end-to-end delivery in a Scrum environment with weekly client demos, driving the product to a successful go-live in July 2022.
Relocated on-site to Malaysia to work directly with client stakeholders and lead continuous platform enhancements.

DEBUG Jan 2020 — Jun 2021

TCS · Vodafone Idea Ltd.

India

Software Engineer — IoT Platform

Reverse Logistics & device lifecycle

Designed and implemented the complete Reverse Logistics Module for device replacement, returns, lost-device processing and lifecycle management.
Architected a reusable, metadata-driven CRUD framework enabling configurable database operations, reducing repetitive development across the platform.
Built backend services with Java, Spring Boot, Hibernate, JDBC and MySQL, delivering enterprise features under Agile practices.

tail -f experience.log

AI & Innovation

Applied Generative & Agentic AI.

Production systems where LLMs do real work inside enterprise systems.

01 Agentic Systems

Telecom Order Recovery Agent

Sep 2025 — Present · In Production

An AI agent deployed to production that automates telecom BSS order-recovery workflows against live enterprise order traffic. Multi-agent orchestration identifies failed order states and recommends automated recovery actions, grounded in SOP documentation retrieved from a Pinecone vector store.

LangGraphLangChainRAGPineconeMCP

02 Retrieval-Augmented

SOP-Grounded Reasoning

Enterprise knowledge automation

Retrieval-Augmented Generation over telecom standard-operating-procedure documentation — letting the system reason over real internal knowledge to diagnose issues and suggest next actions rather than guessing.

OpenAIAnthropic ClaudePrompt EngineeringPinecone

Toolkit

The stack I build with.

skills.json

{

"backend": ["Java", "Spring Boot", "Spring MVC", "Spring Cloud", "Hibernate", "Spring Data JPA", "REST APIs", "Microservices", "Distributed Systems"],

"databases": ["MySQL", "MariaDB", "Oracle", "Elasticsearch", "Redis", "Pinecone"],

"cloud_devops": ["Microsoft Azure", "Apache Kafka", "CI/CD", "Jenkins", "Maven", "GitLab", "GitHub", "Docker", "Swagger", "Postman"],

"generative_ai_llm": ["LangChain", "LangGraph", "Multi-Agent Orchestration", "RAG", "MCP", "OpenAI API", "Anthropic Claude", "AI Agents"],

"ai_assisted_dev": ["Claude Code", "GitHub Copilot", "Codex", "Cursor", "Kiro"],

"security_quality": ["OAuth 2.0", "JWT", "Spring Security", "RBAC", "API Security", "Playwright", "JUnit", "SonarQube"],

"languages_leadership": ["SQL", "Python", "JavaScript", "Team Leadership", "Code Reviews", "Agile Delivery"]

}

Credentials

Certifications & education.

Certifications

Microsoft Certified: Azure AI Engineer Associate

AI-102

Microservices Architecture with Spring Boot & Spring Cloud

Udemy

Education

B.Tech, Computer Science Engineering

B. S. Anangpuria Institute of Technology & Management

Contact

Let's talk.

Open to Senior / Lead backend and AI engineering roles — in Delhi NCR or remote. Reach out and I'll get back to you.

sanjeevan6000@gmail.com

+91 99903 03390

New Delhi, India

linkedin.com/in/d-sanjeevan