How I Evaluate an Unfamiliar Codebase Before Making Major Changes
A practical codebase evaluation process for senior engineers who need to understand risk, architecture, tests, data, and delivery before making major changes.
Aminul Islam Alvi · Dhaka, Bangladesh
Senior Software Engineer building scalable SaaS products, modern web platforms and maintainable systems
I work across TypeScript, Node.js, React, Vue, PHP/Laravel, relational data, containers, testing, accessibility, and software architecture with an emphasis on safe change and long-term maintainability.
Areas of expertise
The parts of product engineering I can own, improve, and explain clearly to a team.
TypeScript and Node.js engineering
Architecture and delivery for maintainable TypeScript applications, Node.js services, APIs, relational data, testing, and production operations.
Software architecture for evolving products
Pragmatic software architecture for SaaS products, platform boundaries, relational data, integrations, reliability, and incremental delivery.
Frontend modernisation without the big-bang rewrite
Incremental frontend modernisation using React, Vue, Next.js, component systems, accessible UI patterns, and maintainable integration boundaries.
SaaS delivery and cloud-ready engineering
End-to-end SaaS engineering across product interfaces, APIs, relational data, containers, CI/CD, testing, and reliable delivery.
Selected engineering outcomes
Lets Learn LMS
A learning management system with course management, authentication, video resources, and progress tracking.
FeatureShark
A SaaS platform for collecting customer feedback, prioritising features, and managing a product feedback workflow.
Wealth Management Platform
A secure WordPress Multisite platform with custom React and Gutenberg components for financial content teams.
Latest technical articles
Senior Software Engineer vs Staff Engineer vs Tech Lead: What Actually Changes?
A realistic breakdown of what actually changes when you move from Senior Software Engineer to Tech Lead or Staff Engineer.
What a Senior Software Engineer Should Own in a Modern SaaS Team
A practical guide to senior engineer ownership across product decisions, delivery, reliability, technical quality, and team effectiveness in a SaaS company.
Engineering notes and experiments
I also publish hands-on learning notes about Go, Rust, Distributed systems, RAG, Machine learning. These are presented as active study and experimentation, not senior-level commercial claims.