---
title: "Rohan Mahajan - Senior Software Engineer in Greater Bengaluru Area | Tal"
description: "Meet Rohan Mahajan, Staff Software Engineer · Full Stack & AI Systems | React, TypeScript, Java, Node.js, Go | LLM/RAG, LangChain | PostgreSQL, BigQuery, Airflow | 11.8 yrs based in Greater Bengaluru Area. AI stack includes opencode and claudecode."
image: "https://tal.club/meet/rohan-mahajan-1/share-image"
---

# Rohan Mahajan on Tal

## Headline

Staff Software Engineer · Full Stack & AI Systems \| React, TypeScript, Java, Node\.js, Go \| LLM/RAG, LangChain \| PostgreSQL, BigQuery, Airflow \| 11\.8 yrs

## About

Staff\-level Full Stack Engineer with 11\.8 years building high\-scale web platforms, microservices, data pipelines, and production AI systems — end\-to\-end across React/TypeScript, Java Spring Boot, Node\.js, and Apache Airflow\. At Walmart Global Tech, I architected a production RAG pipeline \(pgvector \+ LangChain\) that cut analyst report turnaround by 70% and eliminated manual SQL work for business teams\. I led the DOOH in\-store advertising network expansion to 7 channels — $228K\+ campaign budgets, 1\.3M\+ ad plays/month — and built the Java Spring Boot microservices behind it, cutting p99 validation latency 40%\. I own the full\-stack campaign dashboard \(React/TypeScript, Java Spring Boot \+ Node\.js/Express, PostgreSQL \+ BigQuery\) and the Airflow pipelines that feed it\. Before Walmart, at Nagarro, I scaled the Spark Driver platform from 6,000 to 150,000\+ active drivers \(25x\) — Java Spring Boot APIs, a React/Next\.js component library at 100% test coverage, and AWS infrastructure that held under the load\. That work earned me a direct FTE offer from Walmart\. I operate across the stack with a systems\-design mindset, measurable impact at every layer, and a habit of mentoring engineers into their next level \(2 mentees promoted; one intern's project earned them a full\-time offer\)\. Walmart restructured in 2026 and my role was impacted — so I'm now looking for Staff Full Stack or Staff Platform Engineering roles where I can own systems end\-to\-end: API design, data infrastructure, frontend, and AI/LLM systems\. Open to Bengaluru, remote, and relocation\. If you're hiring or know a team that's a fit — React/TypeScript, Java, Node\.js, distributed systems, RAG/LLM — I'd welcome a message\.

## Location

Greater Bengaluru Area

## AI stack

opencode

claudecode

## Work experience

Senior Software Engineer at Walmart Global Tech India, Feb 2023 \- Jun 2026 · 3 yrs 5 mos, Bengaluru, Karnataka, India, \- Architected a production RAG pipeline — embedded ad campaign metadata and 12\-month performance history into pgvector, orchestrated retrieval via LangChain — reducing analyst report turnaround by 70% and eliminating manual SQL dependency for business teams\. \- Led Walmart's DOOH in\-store advertising network expansion from TV Walls to 7 channels \(Self\-Checkout, In\-Aisle Screens, Auto Parts, Vision Center, Electronics\) — supporting $228K\+ campaign budgets and 1\.3M\+ ad plays/month\. \- Built Java Spring Boot microservices for ad campaign scheduling and validation — decoupled ingestion, validation, and reporting into independently deployable services, cutting p99 validation latency 40%\. \- Own the full\-stack campaign dashboard end\-to\-end: React/TypeScript frontend, Java Spring Boot \+ Node\.js/Express APIs, PostgreSQL and BigQuery data layer — the primary reporting surface for multi\-channel campaign performance\. \- Designed Apache Airflow ETL pipelines \(Python\) to normalize ad data from Salesforce CRM and 7\+ channel sources, replacing manual reconciliation with automated ingestion\. \- Integrated AI agent tooling — prompt engineering and LLM orchestration via the Anthropic/Claude API — to automate code\-generation and reporting workflows across the team\. \- Mentored 2 junior engineers through code reviews, system design sessions, and pair programming within an 8\-person agile team\.

Associate Staff Engineer at Nagarro, Jul 2021 \- Feb 2023 · 1 yr 8 mos, Gurugram, Haryana, India, • Delivered the Walmart Spark Driver platform — Walmart's last\-mile gig driver onboarding and management product — scaling active driver enrollment from 6,000 to 150,000\+ drivers and directly enabling Walmart's last\-mile delivery expansion across the US\. • Built NodeJs REST APIs and backend microservices for the Spark Driver platform, applying service\-discovery patterns to sustain 25x driver volume growth without service degradation\. • Provisioned AWS infrastructure \(S3 and Elastic Load Balancer\) for scalable, highly\-available deployment; implemented Adobe Analytics instrumentation to surface behavioral metrics for product prioritization\. \- Conducted root cause analysis \(RCA\) and led UAT sessions with business users, reducing production issues and improving release confidence\. • Led a cross\-org team of 4 \(1 Nagarro engineer \+ 2 Walmart FTEs\) as a contractor managing client\-side engineers\. • Platform delivery and team impact earned a direct FTE conversion offer from Walmart Global Tech India\.

Software Engineer at Gartner, Nov 2018 \- Jul 2021 · 2 yrs 9 mos, Gurugram, Haryana, India, • Owned full\-stack development on Gartner's core product website in Adobe Experience Manager \(AEM\), delivering change requests and new features for a global enterprise B2B audience\. • Implemented React\-based SPA components to replace legacy server\-rendered pages as part of a platform modernization initiative\. • Ran Lighthouse performance audits and resolved critical rendering bottlenecks, improving Core Web Vitals on a high\-traffic global site\.

Experience Technologist at Publicis Sapient, Jun 2016 \- Nov 2018 · 2 yrs 6 mos, Gurugram, Haryana, India, • Built and maintained web platforms for global clients — Johnson Outdoors, Roche, and Kia Motors — using Adobe Experience Manager \(AEM\) with a mobile\-first approach\. • Developed full\-stack e\-commerce features in HTML, CSS, JavaScript, SASS, Node\.js, and Drupal within an Agile delivery environment\. • Resolved WCAG 2\.0 accessibility violations for pharmaceutical and automotive clients, improving compliance and reducing client\-reported support tickets\.

Client Interface / Frontend Lead at All India Radio, Apr 2015 \- May 2016 · 1 yr 2 mos, Greater Delhi Area, • Led the frontend engineering team for India's national public broadcaster, delivering in\-house digital products and client\-facing web applications\. • Established the organization's first frontend standards documentation \(HTML, CSS, JavaScript, PHP\), improving team code consistency and onboarding speed\. • Served as the primary client interface for the External Services Division, managing deadlines and stakeholder deliverables across the organization\.

## Education

B\.tech, Computer Science, Guru Gobind Singh Indraprastha University

[View the original profile](https://tal.club/meet/rohan-mahajan-1)

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