Rajasegar Rajaraman
Chennai
Summary
Dynamic Senior Software Engineer and Engineering Leader with over 12 years of experience in designing, building, and supporting large-scale, customer-facing systems in the retail and e-commerce sectors. Currently leading POS applications for Walmart and Sam's Club, facilitating operations for over 4,500 Walmart stores and 604 Sam's Clubs. Expertise includes full-stack development with a focus on Java, Spring Boot, Python, NodeJS, ReactJS/NextJS, RESTful APIs, and microservices architecture, complemented by strong proficiency in cloud platforms such as Azure, GCP, and AWS. Recognized for enhancing omni-channel experiences through innovative solutions in predictive maintenance and automation while fostering collaboration across cross-functional teams to ensure alignment with enterprise architecture and compliance standards.
Overview
13
13
years of professional experience
1
1
Certification
Work History
Senior Software Engineer / POS Lead
Walmart Global Tech India
10.2021 - Current
- Lead engineer for POS applications serving 4,500+ Walmart stores and 604 Sam’s Clubs, responsible for stability, performance, and quality of mission-critical store systems.
- Design and develop microservices and APIs using Java/Spring Boot, Python, NodeJS, ReactJS/NextJS for omni-channel retail and customer-facing applications, with a focus on scalability, security, and high availability on Azure and GCP (with prior work on AWS).
- Act as Service Reliability Engineer (SRE), designing and implementing system architecture, infrastructure, health checks, and performance metrics to ensure resilient, production-ready releases.
- Implement automation, configuration management, and CI/CD pipelines (Jenkins, GitHub Actions), reducing manual effort and improving release speed, consistency, and quality.
- Apply machine learning for predictive maintenance on POS hardware and store systems by analysing large datasets to proactively prevent failures and reduce downtime in stores.
- Enhance observability and production readiness using Prometheus, Grafana, Splunk, AppDynamics, Kibana, New Relic, defining dashboards, alerts, and SLOs to detect issues early and lower MTTR.
- Work closely with cross-functional and vendor teams (Product, Infrastructure, external partners) to evaluate solutions, review designs, and ensure alignment with architecture, security, and PCI-DSS compliance.
- Lead and mentor engineers in TDD, CI/CD, DevOps, incident management, guiding code reviews, design discussions, and internal knowledge sharing, and promoting an engineering-led quality culture.
- Own post-release hyper-care and ongoing maintenance, including corrective, adaptive, and preventive improvements, and drive root-cause analysis (RCA) and permanent fixes for complex production issues.
- Led development of scalable software solutions to enhance operational efficiency.
- Implemented automated testing frameworks, improving code quality and deployment speed.
- Conducted code reviews, ensuring adherence to best practices and security standards.
- Designed microservices architecture, optimizing system performance and resource utilization.
- Managed multiple projects simultaneously while maintaining strict deadlines and high-quality standards.
- Analyzed proposed technical solutions based on customer requirements.
- Delivered unit-tested systems within customer-prescribed timeframes.
- Tested methodology with writing and execution of test plans, debugging and testing scripts and tools.
- Developed robust, scalable, modular and API-centric infrastructures.
- Developed next generation integration platform for internal applications.
Assistant Consultant
Tata Consultancy Services Ltd
01.2017 - 10.2021
- Led WebSphere Commerce support and team for large e-commerce platforms (Petco.com, Paris.cl) in an onshore–offshore and multi-vendor environment, ensuring high availability and stable releases.
- Provided L2 production support aligned with ITIL, managing incidents, long-pending issues, SLA breaches, and driving problem management and permanent fixes.
- Improved application stability and performance by identifying recurring failures and bottlenecks, and advising application owners on remediation, optimization, and risk-based prioritization.
- Collaborated with cross-functional and vendor teams on online promotion creation and monitoring, reporting KPIs and quality improvements through weekly and monthly client meetings.
- Developed support automation tools for order management, server tracking, and recurring report generation to reduce manual work, operational risk, and defect leakage.
- Used Kibana, IBM Tealeaf, AppDynamics, Elastic Search and other tools to monitor journeys, debug issues, and validate fixes in e-commerce applications.
- Collaborated with cross-functional teams to ensure alignment on project objectives and timelines.
- Assisted in data analysis to support project deliverables and client requirements.
- Streamlined administrative tasks, improving overall efficiency of team operations and communications.
- Facilitated productive communication between clients and internal teams, ensuring alignment on project goals and expectations.
- Served as point of contact for clients regarding follow-up, meeting scheduling, and responses to questions.
- Developed customized metrics tracking systems for each project, ensuring accurate reporting of progress and results.
System Engineer / POS Application Developer
Trent India Limited (via TCS)
11.2012 - 12.2016
- Developed and supported POS and e-commerce functionality for Star Bazaar, Tata Starbucks, Croma, and Westside, improving omni-channel shopping experiences and store reliability.
- Optimized shopping cart and checkout flows to enhance performance, reliability, and customer experience across multiple retail brands.
- Identified system improvement areas via roadmap reviews and implemented OS hardening and MRP-related enhancements to improve stability and security of store systems.
- Designed and implemented newsletter subscription, marketing event, and archive pages, supporting marketing campaigns and ensuring quality through thorough testing and validation.
- Managed deployments, defect triaging, UAT support, and prepared defect resolution plans to maximize closure of defects within each sprint.
- Produced RCA and technical reports for bugs and design flaws, contributing to continuous improvement in application quality and reliability.
- Developed and implemented system configurations to enhance operational efficiency.
- Collaborated with cross-functional teams to troubleshoot and resolve system issues.
- Trained and mentored junior engineers, providing guidance and direction.
- Created detailed reports on engineering activities and findings.
- Contributed to the successful completion of numerous projects, meeting deadlines and adhering to budget constraints.
- Coordinated with stakeholders to define application requirements and scope.
- Contributed to growth of application development portfolio, diversifying business solutions.
Education
Bachelor of Engineering - Electrical and Electronics Engineering
RMK College of Engineering And Technology
Chennai, Tamil Nadu, India05-2012
Skills
- Languages & Frameworks: Java, Spring Boot, Python, NodeJS, ReactJS, NextJS, RESTful APIs, Microservices Architecture
- Cloud & DevOps: Microsoft Azure, Google Cloud Platform (GCP), Amazon Web Services (AWS), Docker, Kubernetes, Jenkins, GitHub Actions, CI/CD automation
- Monitoring & Observability: Prometheus, Grafana, Splunk, Kibana, AppDynamics, New Relic, IBM Tealeaf, XtraHop, Sumologic, Log Viewer
- Retail & Platforms: IBM 4690 POS, IBM WebSphere Application Server, IBM WebSphere Commerce, Akamai, Cloudflare
- Practices & Methodologies: Agile/Scrum, Test Driven Development (TDD), Lean software development, Incident & problem management, SRE mindset
- Languages: English (Native), Tamil (Native), Telugu (Native), French (Novice)
- Java Spring Boot
- Microservices architecture
- API development
- Cloud computing (Azure, GCP)
- Service reliability engineering
- Incident management
Accomplishments
Implemented Predictive maintenance using ML Algorithm in Sams Club post implementation almost 100k revenue loss has been avoided
Implemented automation for order processing from POS to OMS post implementation 60% of incident reduction has been achieved
Implement Grafana dashboards and Splunk Alert integrated with pager duty post implementation almost 40 P1 issues has been identified proactively and major issues been avoided
Certification
- Oracle Certified Professional, Java SE 6 Programmer – Oracle
- Building AI agents - Great Learning
- IBM WebSphere Commerce V5.6 Implementation – IBM
- Oracle PL/SQL Developer Certified Associate – Oracle
- Advanced User – Test Manager (Internal) – Certified Master Craft
Languages
English
Full Professional
Telugu
Native or Bilingual
Tamil
Full Professional
Hindi
Professional Working
Spanish
Limited Working
Received Beyond Excellence Award from Walmart
Received beyond excellence award for the implementation of Predictive Maintenance using ML for hardware devices in Sams Clubs due to which 100k revenue loss been avoided for this implementation received beyond excellence award
Timeline
Senior Software Engineer / POS Lead
Walmart Global Tech India
10.2021 - Current
Assistant Consultant
Tata Consultancy Services Ltd
01.2017 - 10.2021
System Engineer / POS Application Developer
Trent India Limited (via TCS)
11.2012 - 12.2016
Bachelor of Engineering - Electrical and Electronics Engineering
RMK College of Engineering And Technology