Senior Software Engineer · Toronto, Canada

Subhasree
Ghosh.

Nine years of hands-on software engineering across Retail, Banking, and Travel & Hospitality — building backend systems that actually hold up under pressure. I've led distributed teams, modernised legacy platforms, and shipped production APIs used at scale. Currently at Cognizant, onshore in Toronto.

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9 Years
Java & Spring Boot in production
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Team Lead
Onshore lead, 12 offshore devs managed
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65% Less
Deployment time via CI/CD pipelines

Technical toolkit

Skills & Technologies

Core Languages & Frameworks

Java Java 17 Spring Boot J2EE GraphQL

APIs & Architecture

REST APIs Microservices Event-driven Apache Kafka JWT / OAuth

Databases

SQL NoSQL Oracle Couchbase Elasticsearch

DevOps & Cloud

AWS Docker Kubernetes OpenShift CI/CD Jenkins JFrog

Testing & Quality

JUnit Mockito TestNG RestAssured

Monitoring & Observability

Dynatrace Splunk Kibana Grafana Postman

What I've shipped

Work Highlights

Travel & Hospitality

Cruise Line Digital Platform

Serving as onshore lead for a global cruise brand's booking and customer management platform. My work covers GraphQL API design, microservice architecture, and keeping a team of 12 offshore developers on track and aligned — across time zones and multiple pods.

Java Spring Boot GraphQL Microservices Team Lead
Banking & Finance

Real-time Fraud Detection API

Designed and built a fraud detection service from scratch using Java 17 and Kafka — processing transactions in real time with high throughput. Cut database query response times by 40%, locked down security with JWT/OAuth, and maintained 80%+ test coverage throughout.

Java 17 Kafka Docker OpenShift JUnit
Retail & E-commerce

Legacy Modernisation & Oracle Migration

Led a high-stakes Oracle DB migration (11g → 19c) while containerising the entire Java application stack. New CI/CD pipelines slashed deployment time by 65%. Delivered on schedule with no disruption to live retail operations — a result I'm genuinely proud of.

Oracle 19c Docker Kubernetes CI/CD
Application Support

Production Support & SWAT Engineering

Spent years as the go-to person when things broke in production — root cause analysis, incident management, and rapid code fixes for business-critical Java applications. Served as SME bridging the India and North America delivery centres, keeping both sides aligned.

Java SQL Splunk Dynatrace ITIL
Retail · TJX Companies

Back-office Distributed Systems

Worked closely with The TJX Companies' IT team on back-office systems spanning North American and European retail operations. Handled performance tuning, automation initiatives, and feature delivery in an Agile setup — while acting as the bridge between engineering and business.

Java Spring Boot REST APIs Jenkins Jira
Retail · E-commerce

Kafka-powered Merchandising Pipeline

Built and maintained an event-driven data pipeline for a North American e-commerce client, consuming from a legacy system and streaming processed data downstream via Apache Kafka. Tackled complex integration issues and kept the pipeline running reliably at scale.

Apache Kafka Java Spring Boot SQL

Career history

Experience

Mar 2023 — Present
Toronto, Canada · Remote

Lead Software Engineer

Cognizant
Travel & Hospitality · Retail
  • Onshore lead for a global cruise line's booking and customer management platform — GraphQL APIs, microservices, and real-time data sync across operations.
  • Manage and mentor 12 offshore developers across multiple pods; responsible for knowledge transfer, code quality, and keeping delivery on schedule.
  • Built event-driven Kafka pipelines for a North American e-commerce client's merchandising data integration.
  • Run Agile ceremonies — sprint planning, standups, and retrospectives — across multiple teams simultaneously.
  • Work directly with architects and product owners to make sure the technical direction matches what the business actually needs.
Oct 2024 — Mar 2025
Mississauga, Canada

Software Engineer — Banking Domain

Cognizant
Banking & Finance
  • Designed and built a real-time fraud detection API from scratch using Java 17, Spring Boot, and Kafka.
  • Achieved 40% improvement in database query response times through SQL/NoSQL optimisation.
  • Implemented JWT and OAuth security with encryption to meet regulatory compliance requirements.
  • Containerised services on Docker/OpenShift; maintained 80%+ test coverage using JUnit, TestNG, and RestAssured.
Apr 2024 — Sep 2024
Mississauga, Canada

Software Engineer — Retail Modernisation

Cognizant
Retail & Consumer Goods
  • Led a mission-critical Oracle DB migration (11g → 19c) for a major North American retailer.
  • Containerised Java applications with Docker and Kubernetes; new CI/CD pipelines cut deployment time by 65%.
  • Refactored legacy code significantly, reducing technical debt and improving long-term maintainability.
  • Managed 3 offshore developers while serving as the primary technical contact for all stakeholders.
Jun 2021 — Mar 2023
Kolkata, India · On-site

Software Engineer — TJX Companies

Cognizant
Retail & Consumer Goods
  • Built backend services (Java, Spring Boot, REST) for in-store operations, including MobiControl device management integration.
  • Integrated with Oracle Retail and POS systems for real-time data sync across store operations.
  • Deployed scalable microservices handling high transaction volumes across global retail locations.
  • Facilitated the international rollout of a modernised markdown system, coordinating across technical teams, product owners, and regional stakeholders.
  • Served as Subject Matter Expert from the India delivery centre — primary point of contact for both dev teams and business stakeholders.
Sep 2018 — Jun 2021
Kolkata, India · On-site

Programming Analyst — TJX Companies

Cognizant
Retail · Application Support & Development
  • Supported and developed Java-based back-office and distributed systems for North American and European retail operations.
  • Resolved critical production incidents through root cause analysis and rapid code fixes — minimal downtime, fast turnaround.
  • Conducted system audits and performance tuning on backend services and database queries.
  • Contributed to automation initiatives that cut manual deployment steps significantly.
  • Acted as the liaison between the client's IT team and Cognizant's engineering groups — keeping communication clear on both sides.
Oct 2016 — Sep 2018
Kolkata, India · On-site

Associate Software Engineer

Accenture
Retail · Application Support
  • Supported a suite of critical Java applications for a European retail client using Core Java, J2EE, Spring, SQL, and ITIL practices.
  • Handled incident management, problem resolution, and root cause analysis to keep business processes running smoothly.
  • First engineering role — where I learned that keeping production stable is just as important as building new features.
Jun 2012 — Jun 2016
Kolkata, India

B.Tech, Engineering

Academy of Technology — West Bengal

Let's talk

Open to opportunities

I'm open to senior engineering and lead roles — particularly in Java, microservices, and cloud-native backends. Based in Toronto, open to remote or hybrid. Feel free to reach out directly.

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