Ahad Chowdhury

Contractual engagement for Commonwealth Bank of Australia (CBA). Responsibilities:

• Served as Technical Lead for the lost/stolen card replacement feature within Net Bank Next, a large-scale modernisation of CBA’s online banking platform, working with the Product Owner, Product Manager, Solution Architect, and engineers to translate business requirements into technical delivery plans.
• Delivered customer-facing banking features using Type Script, React. js, Next. js, Zod, Graph QL, and Lumen, an internal UI component library.
• Integrated the Next. js Backend-for-Frontend (BFF) layer with downstream banking APIs and Adobe Experience Manager (AEM).
• Worked with enterprise platform capabilities including Keycloak-based authentication and Launch Darkly feature management to support controlled application releases.
• Resolved a defect in Comm See Classic, a legacy internal banking application built with ASP.

NET 4. x and Angular.

• Implemented unit tests using Vitest and React Testing Library (RTL) to validate frontend components, user interactions, and feature-specific behaviour.
• Worked with Team City and Git Hub Actions pipelines to monitor build health, automated test results, and deployment workflows.
• Utilised Sonar Qube and Snyk reports to identify code quality issues and security vulnerabilities during the development lifecycle.
• Developed end-to-end test automation for agentic AI workflows using Playwright and used Langfuse observability tooling to debug agent execution flows, trace LLM interactions, and analyse workflow behaviour.
• Supported deployments on test environments on Dev Ops Hosting Platform (DHP), an AWS-based internal container hosting platform of CBA, through Git Hub Actions.
• Improved engineering quality through pull request reviews, technical feedback, knowledge-sharing sessions, and guidance on end-to-end testing practices.

Worked at CORTO, a division of LEAP Dev, on the cloud-hosted backend of an AI-assisted productivity platform for law firms, based on Large Language Models (LLM) and Retrieval Augmented Generation (RAG). Responsibilities:

• Developed backend features for document ingestion, text extraction, vectorisation, file deletion, and metadata updates using ASP. NET Core, MediatR, Entity Framework Core, Flurl, and AWS SDK.
• Implemented integration with Dropbox, including a webhook service using ASP. NET Core, AWS Lambda, and Dynamo DB, to enable document updates from Dropbox to be captured, processed, and synchronised with the platform.
• Built an AWS Lambda workflow triggered by Event Bridge and SQS to process large-document uploads after multipart upload completion on Amazon S3.
• Added features to internal NuGet packages used for service communication and released updated package versions through AWS Code Artifact.
• Improved resiliency of external service communication by using retry and fault-handling patterns with Polly.
• Wrote unit and integration tests using xUnit, NSubstitute, and Testcontainers to validate service behaviour and database integration.
• Collaborated with Dev Ops engineers on AWS deployment strategies and monitoring of application logs and performane metrics using AWS Cloud Watch.
• Coordinated with US-based frontend engineers to align backend API behaviour, integration requirements, and delivery timelines.

Responsible for the development of the internal CRM solution. Responsibilities:

• Collaborated closely with directors and both onshore and offshore teams to align business requirements and CRM system features with organisational goals.
• Completed the development of a responsive and interactive frontend application using Type Script, React. js, Redux. js, Next. js, Material UI (MUI), and Storybook.
• Architected and implemented a robust backend solution using ASP.

NET Core and Entity Framework Core.

• Implemented user authentication and authorisation using ASP. NET Core Identity, integrated with the Next. js BFF layer to deliver a seamless user experience.
• Managed relational and in-memory databases with Postgre SQL for persistent storage of relational entities and Redis for in-memory response caching for fast data access.
• Integrated various third-party systems, including lead collection from website contact forms and Facebook (Meta) Ads, into the CRM to streamline marketing efforts.
• Conducted frontend testing with Jest, React Testing Library (RTL), and Playwright.
• Performed backend testing using xUnit and Moq to maintain integrity and reliability.
• Developed the CI/CD pipeline for the frontend project using Git Hub Actions.
• Deployed the production system on a Debian VPS instance on Linode using SSH, Systemd, Nginx, Certbot, Let’s Encrypt, and PM2.
• Provide continuing maintenance to existing systems and platforms.
• Authored comprehensive end-user documentation on CRM functionalities.
• Assisted the team to transition from ZohoCRM to the newly developed CRM through data migration and staff training.

Responsible for the development of enterprise-grade software solutions. Projects:

• OpenCRVS, an open-source solution for civil registration and vital statistics
• The full-stack solution for Olwel, a Finland-based healthcare startup. Responsibilities:
• Engineered key frontend features and resolved critical bugs using Type Script, React. js, Redux. js, Material UI (MUI), Styled Components, Formik, and Electron. js.
• Developed scalable backend services with Type Script, Node. js, Hapi. js, Mongo DB, Rethink DB, Graph QL (Apollo Server), Socket. io, Docker, and AWS S3.
• Optimised Rethink DB queries by 20%-50% by resolving the N+ 1 query issue.
• Wrote extensive unit tests using Jest, Mocha, and Enzyme
• Composed end-to-end tests using Cypress.
• Refactored legacy code to improve maintainability and meet coverage targets using Istanbul and Codecov.
• Developed database migration scripts to anonymise patient data for compliance.
• Upgraded outdated dependencies to eliminate potential security vulnerabilities.
• Refactored legacy class-based React. js components into modern functional components using hooks to support integration with newer versions of MUI.
• Initiated and led the development of a medical prescription app for doctors.
• Participated in Agile workflow through daily standups, sprint planning, and retrospective meetings.
• Reported development progress to the CTO and business stakeholders.

Worked on a research project funded by the Department of Environmental Science & Management for developing NODES, an aviation software that simulates navigation systems and compares them in terms of fuel efficiency and carbon emission. Responsibilities:

• Development of the frontend of NODES with Windows Forms (. NET Framework).
• Communicated with the backend developer regarding communication between Python backend and Windows Forms frontend.
• Collaborated with other research assistants working on different areas of the project.